aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/libs/curl/lib/vtls/sectransp.c
blob: c764e3631b5614fd407010633aeb42b98e65275f (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 2012 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
 * Copyright (C) 2012 - 2017, Nick Zitzmann, <nickzman@gmail.com>.
 *
 * This software is licensed as described in the file COPYING, which
 * you should have received as part of this distribution. The terms
 * are also available at https://curl.se/docs/copyright.html.
 *
 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
 * copies of the Software, and permit persons to whom the Software is
 * furnished to do so, under the terms of the COPYING file.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 * SPDX-License-Identifier: curl
 *
 ***************************************************************************/

/*
 * Source file for all iOS and macOS SecureTransport-specific code for the
 * TLS/SSL layer. No code but vtls.c should ever call or use these functions.
 */

#include "curl_setup.h"

#include "urldata.h" /* for the Curl_easy definition */
#include "curl_base64.h"
#include "strtok.h"
#include "multiif.h"
#include "strcase.h"
#include "x509asn1.h"
#include "strerror.h"

#ifdef USE_SECTRANSP

#ifdef __clang__
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wtautological-pointer-compare"
#endif /* __clang__ */

#include <limits.h>

#include <Security/Security.h>
/* For some reason, when building for iOS, the omnibus header above does
 * not include SecureTransport.h as of iOS SDK 5.1. */
#include <Security/SecureTransport.h>
#include <CoreFoundation/CoreFoundation.h>
#include <CommonCrypto/CommonDigest.h>

/* The Security framework has changed greatly between iOS and different macOS
   versions, and we will try to support as many of them as we can (back to
   Leopard and iOS 5) by using macros and weak-linking.

   In general, you want to build this using the most recent OS SDK, since some
   features require curl to be built against the latest SDK. TLS 1.1 and 1.2
   support, for instance, require the macOS 10.8 SDK or later. TLS 1.3
   requires the macOS 10.13 or iOS 11 SDK or later. */
#if (TARGET_OS_MAC && !(TARGET_OS_EMBEDDED || TARGET_OS_IPHONE))

#if MAC_OS_X_VERSION_MAX_ALLOWED < 1050
#error "The Secure Transport back-end requires Leopard or later."
#endif /* MAC_OS_X_VERSION_MAX_ALLOWED < 1050 */

#define CURL_BUILD_IOS 0
#define CURL_BUILD_IOS_7 0
#define CURL_BUILD_IOS_9 0
#define CURL_BUILD_IOS_11 0
#define CURL_BUILD_IOS_13 0
#define CURL_BUILD_MAC 1
/* This is the maximum API level we are allowed to use when building: */
#define CURL_BUILD_MAC_10_5 MAC_OS_X_VERSION_MAX_ALLOWED >= 1050
#define CURL_BUILD_MAC_10_6 MAC_OS_X_VERSION_MAX_ALLOWED >= 1060
#define CURL_BUILD_MAC_10_7 MAC_OS_X_VERSION_MAX_ALLOWED >= 1070
#define CURL_BUILD_MAC_10_8 MAC_OS_X_VERSION_MAX_ALLOWED >= 1080
#define CURL_BUILD_MAC_10_9 MAC_OS_X_VERSION_MAX_ALLOWED >= 1090
#define CURL_BUILD_MAC_10_11 MAC_OS_X_VERSION_MAX_ALLOWED >= 101100
#define CURL_BUILD_MAC_10_13 MAC_OS_X_VERSION_MAX_ALLOWED >= 101300
#define CURL_BUILD_MAC_10_15 MAC_OS_X_VERSION_MAX_ALLOWED >= 101500
/* These macros mean "the following code is present to allow runtime backward
   compatibility with at least this cat or earlier":
   (You set this at build-time using the compiler command line option
   "-mmacosx-version-min.") */
#define CURL_SUPPORT_MAC_10_5 MAC_OS_X_VERSION_MIN_REQUIRED <= 1050
#define CURL_SUPPORT_MAC_10_6 MAC_OS_X_VERSION_MIN_REQUIRED <= 1060
#define CURL_SUPPORT_MAC_10_7 MAC_OS_X_VERSION_MIN_REQUIRED <= 1070
#define CURL_SUPPORT_MAC_10_8 MAC_OS_X_VERSION_MIN_REQUIRED <= 1080
#define CURL_SUPPORT_MAC_10_9 MAC_OS_X_VERSION_MIN_REQUIRED <= 1090

#elif TARGET_OS_EMBEDDED || TARGET_OS_IPHONE
#define CURL_BUILD_IOS 1
#define CURL_BUILD_IOS_7 __IPHONE_OS_VERSION_MAX_ALLOWED >= 70000
#define CURL_BUILD_IOS_9 __IPHONE_OS_VERSION_MAX_ALLOWED >= 90000
#define CURL_BUILD_IOS_11 __IPHONE_OS_VERSION_MAX_ALLOWED >= 110000
#define CURL_BUILD_IOS_13 __IPHONE_OS_VERSION_MAX_ALLOWED >= 130000
#define CURL_BUILD_MAC 0
#define CURL_BUILD_MAC_10_5 0
#define CURL_BUILD_MAC_10_6 0
#define CURL_BUILD_MAC_10_7 0
#define CURL_BUILD_MAC_10_8 0
#define CURL_BUILD_MAC_10_9 0
#define CURL_BUILD_MAC_10_11 0
#define CURL_BUILD_MAC_10_13 0
#define CURL_BUILD_MAC_10_15 0
#define CURL_SUPPORT_MAC_10_5 0
#define CURL_SUPPORT_MAC_10_6 0
#define CURL_SUPPORT_MAC_10_7 0
#define CURL_SUPPORT_MAC_10_8 0
#define CURL_SUPPORT_MAC_10_9 0

#else
#error "The Secure Transport back-end requires iOS or macOS."
#endif /* (TARGET_OS_MAC && !(TARGET_OS_EMBEDDED || TARGET_OS_IPHONE)) */

#if CURL_BUILD_MAC
#include <sys/sysctl.h>
#endif /* CURL_BUILD_MAC */

#include "urldata.h"
#include "sendf.h"
#include "inet_pton.h"
#include "connect.h"
#include "select.h"
#include "vtls.h"
#include "sectransp.h"
#include "curl_printf.h"
#include "strdup.h"

#include "curl_memory.h"
/* The last #include file should be: */
#include "memdebug.h"

/* From MacTypes.h (which we can't include because it isn't present in iOS: */
#define ioErr -36
#define paramErr -50

struct ssl_backend_data {
  SSLContextRef ssl_ctx;
  curl_socket_t ssl_sockfd;
  bool ssl_direction; /* true if writing, false if reading */
  size_t ssl_write_buffered_length;
};

struct st_cipher {
  const char *name; /* Cipher suite IANA name. It starts with "TLS_" prefix */
  const char *alias_name; /* Alias name is the same as OpenSSL cipher name */
  SSLCipherSuite num; /* Cipher suite code/number defined in IANA registry */
  bool weak; /* Flag to mark cipher as weak based on previous implementation
                of Secure Transport back-end by CURL */
};

/* Macro to initialize st_cipher data structure: stringify id to name, cipher
   number/id, 'weak' suite flag
 */
#define CIPHER_DEF(num, alias, weak) \
  { #num, alias, num, weak }

/*
 Macro to initialize st_cipher data structure with name, code (IANA cipher
 number/id value), and 'weak' suite flag. The first 28 cipher suite numbers
 have the same IANA code for both SSL and TLS standards: numbers 0x0000 to
 0x001B. They have different names though. The first 4 letters of the cipher
 suite name are the protocol name: "SSL_" or "TLS_", rest of the IANA name is
 the same for both SSL and TLS cipher suite name.
 The second part of the problem is that macOS/iOS SDKs don't define all TLS
 codes but only 12 of them. The SDK defines all SSL codes though, i.e. SSL_NUM
 constant is always defined for those 28 ciphers while TLS_NUM is defined only
 for 12 of the first 28 ciphers. Those 12 TLS cipher codes match to
 corresponding SSL enum value and represent the same cipher suite. Therefore
 we'll use the SSL enum value for those cipher suites because it is defined
 for all 28 of them.
 We make internal data consistent and based on TLS names, i.e. all st_cipher
 item names start with the "TLS_" prefix.
 Summarizing all the above, those 28 first ciphers are presented in our table
 with both TLS and SSL names. Their cipher numbers are assigned based on the
 SDK enum value for the SSL cipher, which matches to IANA TLS number.
 */
#define CIPHER_DEF_SSLTLS(num_wo_prefix, alias, weak) \
  { "TLS_" #num_wo_prefix, alias, SSL_##num_wo_prefix, weak }

/*
 Cipher suites were marked as weak based on the following:
 RC4 encryption - rfc7465, the document contains a list of deprecated ciphers.
     Marked in the code below as weak.
 RC2 encryption - many mentions, was found vulnerable to a relatively easy
     attack https://link.springer.com/chapter/10.1007%2F3-540-69710-1_14
     Marked in the code below as weak.
 DES and IDEA encryption - rfc5469, has a list of deprecated ciphers.
     Marked in the code below as weak.
 Anonymous Diffie-Hellman authentication and anonymous elliptic curve
     Diffie-Hellman - vulnerable to a man-in-the-middle attack. Deprecated by
     RFC 4346 aka TLS 1.1 (section A.5, page 60)
 Null bulk encryption suites - not encrypted communication
 Export ciphers, i.e. ciphers with restrictions to be used outside the US for
     software exported to some countries, they were excluded from TLS 1.1
     version. More precisely, they were noted as ciphers which MUST NOT be
     negotiated in RFC 4346 aka TLS 1.1 (section A.5, pages 60 and 61).
     All of those filters were considered weak because they contain a weak
     algorithm like DES, RC2 or RC4, and already considered weak by other
     criteria.
 3DES - NIST deprecated it and is going to retire it by 2023
 https://csrc.nist.gov/News/2017/Update-to-Current-Use-and-Deprecation-of-TDEA
     OpenSSL https://www.openssl.org/blog/blog/2016/08/24/sweet32/ also
     deprecated those ciphers. Some other libraries also consider it
     vulnerable or at least not strong enough.

 CBC ciphers are vulnerable with SSL3.0 and TLS1.0:
 https://www.cisco.com/c/en/us/support/docs/security/email-security-appliance
 /118518-technote-esa-00.html
     We don't take care of this issue because it is resolved by later TLS
     versions and for us, it requires more complicated checks, we need to
     check a protocol version also. Vulnerability doesn't look very critical
     and we do not filter out those cipher suites.
 */

#define CIPHER_WEAK_NOT_ENCRYPTED   TRUE
#define CIPHER_WEAK_RC_ENCRYPTION   TRUE
#define CIPHER_WEAK_DES_ENCRYPTION  TRUE
#define CIPHER_WEAK_IDEA_ENCRYPTION TRUE
#define CIPHER_WEAK_ANON_AUTH       TRUE
#define CIPHER_WEAK_3DES_ENCRYPTION TRUE
#define CIPHER_STRONG_ENOUGH        FALSE

/* Please do not change the order of the first ciphers available for SSL.
   Do not insert and do not delete any of them. Code below
   depends on their order and continuity.
   If you add a new cipher, please maintain order by number, i.e.
   insert in between existing items to appropriate place based on
   cipher suite IANA number
*/
const static struct st_cipher ciphertable[] = {
  /* SSL version 3.0 and initial TLS 1.0 cipher suites.
     Defined since SDK 10.2.8 */
  CIPHER_DEF_SSLTLS(NULL_WITH_NULL_NULL,                           /* 0x0000 */
                    NULL,
                    CIPHER_WEAK_NOT_ENCRYPTED),
  CIPHER_DEF_SSLTLS(RSA_WITH_NULL_MD5,                             /* 0x0001 */
                    "NULL-MD5",
                    CIPHER_WEAK_NOT_ENCRYPTED),
  CIPHER_DEF_SSLTLS(RSA_WITH_NULL_SHA,                             /* 0x0002 */
                    "NULL-SHA",
                    CIPHER_WEAK_NOT_ENCRYPTED),
  CIPHER_DEF_SSLTLS(RSA_EXPORT_WITH_RC4_40_MD5,                    /* 0x0003 */
                    "EXP-RC4-MD5",
                    CIPHER_WEAK_RC_ENCRYPTION),
  CIPHER_DEF_SSLTLS(RSA_WITH_RC4_128_MD5,                          /* 0x0004 */
                    "RC4-MD5",
                    CIPHER_WEAK_RC_ENCRYPTION),
  CIPHER_DEF_SSLTLS(RSA_WITH_RC4_128_SHA,                          /* 0x0005 */
                    "RC4-SHA",
                    CIPHER_WEAK_RC_ENCRYPTION),
  CIPHER_DEF_SSLTLS(RSA_EXPORT_WITH_RC2_CBC_40_MD5,                /* 0x0006 */
                    "EXP-RC2-CBC-MD5",
                    CIPHER_WEAK_RC_ENCRYPTION),
  CIPHER_DEF_SSLTLS(RSA_WITH_IDEA_CBC_SHA,                         /* 0x0007 */
                    "IDEA-CBC-SHA",
                    CIPHER_WEAK_IDEA_ENCRYPTION),
  CIPHER_DEF_SSLTLS(RSA_EXPORT_WITH_DES40_CBC_SHA,                 /* 0x0008 */
                    "EXP-DES-CBC-SHA",
                    CIPHER_WEAK_DES_ENCRYPTION),
  CIPHER_DEF_SSLTLS(RSA_WITH_DES_CBC_SHA,                          /* 0x0009 */
                    "DES-CBC-SHA",
                    CIPHER_WEAK_DES_ENCRYPTION),
  CIPHER_DEF_SSLTLS(RSA_WITH_3DES_EDE_CBC_SHA,                     /* 0x000A */
                    "DES-CBC3-SHA",
                    CIPHER_WEAK_3DES_ENCRYPTION),
  CIPHER_DEF_SSLTLS(DH_DSS_EXPORT_WITH_DES40_CBC_SHA,              /* 0x000B */
                    "EXP-DH-DSS-DES-CBC-SHA",
                    CIPHER_WEAK_DES_ENCRYPTION),
  CIPHER_DEF_SSLTLS(DH_DSS_WITH_DES_CBC_SHA,                       /* 0x000C */
                    "DH-DSS-DES-CBC-SHA",
                    CIPHER_WEAK_DES_ENCRYPTION),
  CIPHER_DEF_SSLTLS(DH_DSS_WITH_3DES_EDE_CBC_SHA,                  /* 0x000D */
                    "DH-DSS-DES-CBC3-SHA",
                    CIPHER_WEAK_3DES_ENCRYPTION),
  CIPHER_DEF_SSLTLS(DH_RSA_EXPORT_WITH_DES40_CBC_SHA,              /* 0x000E */
                    "EXP-DH-RSA-DES-CBC-SHA",
                    CIPHER_WEAK_DES_ENCRYPTION),
  CIPHER_DEF_SSLTLS(DH_RSA_WITH_DES_CBC_SHA,                       /* 0x000F */
                    "DH-RSA-DES-CBC-SHA",
                    CIPHER_WEAK_DES_ENCRYPTION),
  CIPHER_DEF_SSLTLS(DH_RSA_WITH_3DES_EDE_CBC_SHA,                  /* 0x0010 */
                    "DH-RSA-DES-CBC3-SHA",
                    CIPHER_WEAK_3DES_ENCRYPTION),
  CIPHER_DEF_SSLTLS(DHE_DSS_EXPORT_WITH_DES40_CBC_SHA,             /* 0x0011 */
                    "EXP-EDH-DSS-DES-CBC-SHA",
                    CIPHER_WEAK_DES_ENCRYPTION),
  CIPHER_DEF_SSLTLS(DHE_DSS_WITH_DES_CBC_SHA,                      /* 0x0012 */
                    "EDH-DSS-CBC-SHA",
                    CIPHER_WEAK_DES_ENCRYPTION),
  CIPHER_DEF_SSLTLS(DHE_DSS_WITH_3DES_EDE_CBC_SHA,                 /* 0x0013 */
                    "DHE-DSS-DES-CBC3-SHA",
                    CIPHER_WEAK_3DES_ENCRYPTION),
  CIPHER_DEF_SSLTLS(DHE_RSA_EXPORT_WITH_DES40_CBC_SHA,             /* 0x0014 */
                    "EXP-EDH-RSA-DES-CBC-SHA",
                    CIPHER_WEAK_DES_ENCRYPTION),
  CIPHER_DEF_SSLTLS(DHE_RSA_WITH_DES_CBC_SHA,                      /* 0x0015 */
                    "EDH-RSA-DES-CBC-SHA",
                    CIPHER_WEAK_DES_ENCRYPTION),
  CIPHER_DEF_SSLTLS(DHE_RSA_WITH_3DES_EDE_CBC_SHA,                 /* 0x0016 */
                    "DHE-RSA-DES-CBC3-SHA",
                    CIPHER_WEAK_3DES_ENCRYPTION),
  CIPHER_DEF_SSLTLS(DH_anon_EXPORT_WITH_RC4_40_MD5,                /* 0x0017 */
                    "EXP-ADH-RC4-MD5",
                    CIPHER_WEAK_ANON_AUTH),
  CIPHER_DEF_SSLTLS(DH_anon_WITH_RC4_128_MD5,                      /* 0x0018 */
                    "ADH-RC4-MD5",
                    CIPHER_WEAK_ANON_AUTH),
  CIPHER_DEF_SSLTLS(DH_anon_EXPORT_WITH_DES40_CBC_SHA,             /* 0x0019 */
                    "EXP-ADH-DES-CBC-SHA",
                    CIPHER_WEAK_ANON_AUTH),
  CIPHER_DEF_SSLTLS(DH_anon_WITH_DES_CBC_SHA,                      /* 0x001A */
                    "ADH-DES-CBC-SHA",
                    CIPHER_WEAK_ANON_AUTH),
  CIPHER_DEF_SSLTLS(DH_anon_WITH_3DES_EDE_CBC_SHA,                 /* 0x001B */
                    "ADH-DES-CBC3-SHA",
                    CIPHER_WEAK_3DES_ENCRYPTION),
  CIPHER_DEF(SSL_FORTEZZA_DMS_WITH_NULL_SHA,                       /* 0x001C */
             NULL,
             CIPHER_WEAK_NOT_ENCRYPTED),
  CIPHER_DEF(SSL_FORTEZZA_DMS_WITH_FORTEZZA_CBC_SHA,               /* 0x001D */
             NULL,
             CIPHER_STRONG_ENOUGH),

#if CURL_BUILD_MAC_10_9 || CURL_BUILD_IOS_7
  /* RFC 4785 - Pre-Shared Key (PSK) Ciphersuites with NULL Encryption */
  CIPHER_DEF(TLS_PSK_WITH_NULL_SHA,                                /* 0x002C */
             "PSK-NULL-SHA",
             CIPHER_WEAK_NOT_ENCRYPTED),
  CIPHER_DEF(TLS_DHE_PSK_WITH_NULL_SHA,                            /* 0x002D */
             "DHE-PSK-NULL-SHA",
             CIPHER_WEAK_NOT_ENCRYPTED),
  CIPHER_DEF(TLS_RSA_PSK_WITH_NULL_SHA,                            /* 0x002E */
             "RSA-PSK-NULL-SHA",
             CIPHER_WEAK_NOT_ENCRYPTED),
#endif /* CURL_BUILD_MAC_10_9 || CURL_BUILD_IOS_7 */

  /* TLS addenda using AES, per RFC 3268. Defined since SDK 10.4u */
  CIPHER_DEF(TLS_RSA_WITH_AES_128_CBC_SHA,                         /* 0x002F */
             "AES128-SHA",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_DH_DSS_WITH_AES_128_CBC_SHA,                      /* 0x0030 */
             "DH-DSS-AES128-SHA",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_DH_RSA_WITH_AES_128_CBC_SHA,                      /* 0x0031 */
             "DH-RSA-AES128-SHA",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_DHE_DSS_WITH_AES_128_CBC_SHA,                     /* 0x0032 */
             "DHE-DSS-AES128-SHA",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_DHE_RSA_WITH_AES_128_CBC_SHA,                     /* 0x0033 */
             "DHE-RSA-AES128-SHA",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_DH_anon_WITH_AES_128_CBC_SHA,                     /* 0x0034 */
             "ADH-AES128-SHA",
             CIPHER_WEAK_ANON_AUTH),
  CIPHER_DEF(TLS_RSA_WITH_AES_256_CBC_SHA,                         /* 0x0035 */
             "AES256-SHA",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_DH_DSS_WITH_AES_256_CBC_SHA,                      /* 0x0036 */
             "DH-DSS-AES256-SHA",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_DH_RSA_WITH_AES_256_CBC_SHA,                      /* 0x0037 */
             "DH-RSA-AES256-SHA",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_DHE_DSS_WITH_AES_256_CBC_SHA,                     /* 0x0038 */
             "DHE-DSS-AES256-SHA",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_DHE_RSA_WITH_AES_256_CBC_SHA,                     /* 0x0039 */
             "DHE-RSA-AES256-SHA",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_DH_anon_WITH_AES_256_CBC_SHA,                     /* 0x003A */
             "ADH-AES256-SHA",
             CIPHER_WEAK_ANON_AUTH),

#if CURL_BUILD_MAC_10_8 || CURL_BUILD_IOS
  /* TLS 1.2 addenda, RFC 5246 */
  /* Server provided RSA certificate for key exchange. */
  CIPHER_DEF(TLS_RSA_WITH_NULL_SHA256,                             /* 0x003B */
             "NULL-SHA256",
             CIPHER_WEAK_NOT_ENCRYPTED),
  CIPHER_DEF(TLS_RSA_WITH_AES_128_CBC_SHA256,                      /* 0x003C */
             "AES128-SHA256",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_RSA_WITH_AES_256_CBC_SHA256,                      /* 0x003D */
             "AES256-SHA256",
             CIPHER_STRONG_ENOUGH),
  /* Server-authenticated (and optionally client-authenticated)
     Diffie-Hellman. */
  CIPHER_DEF(TLS_DH_DSS_WITH_AES_128_CBC_SHA256,                   /* 0x003E */
             "DH-DSS-AES128-SHA256",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_DH_RSA_WITH_AES_128_CBC_SHA256,                   /* 0x003F */
             "DH-RSA-AES128-SHA256",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_DHE_DSS_WITH_AES_128_CBC_SHA256,                  /* 0x0040 */
             "DHE-DSS-AES128-SHA256",
             CIPHER_STRONG_ENOUGH),

  /* TLS 1.2 addenda, RFC 5246 */
  CIPHER_DEF(TLS_DHE_RSA_WITH_AES_128_CBC_SHA256,                  /* 0x0067 */
             "DHE-RSA-AES128-SHA256",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_DH_DSS_WITH_AES_256_CBC_SHA256,                   /* 0x0068 */
             "DH-DSS-AES256-SHA256",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_DH_RSA_WITH_AES_256_CBC_SHA256,                   /* 0x0069 */
             "DH-RSA-AES256-SHA256",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_DHE_DSS_WITH_AES_256_CBC_SHA256,                  /* 0x006A */
             "DHE-DSS-AES256-SHA256",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_DHE_RSA_WITH_AES_256_CBC_SHA256,                  /* 0x006B */
             "DHE-RSA-AES256-SHA256",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_DH_anon_WITH_AES_128_CBC_SHA256,                  /* 0x006C */
             "ADH-AES128-SHA256",
             CIPHER_WEAK_ANON_AUTH),
  CIPHER_DEF(TLS_DH_anon_WITH_AES_256_CBC_SHA256,                  /* 0x006D */
             "ADH-AES256-SHA256",
             CIPHER_WEAK_ANON_AUTH),
#endif /* CURL_BUILD_MAC_10_8 || CURL_BUILD_IOS */

#if CURL_BUILD_MAC_10_9 || CURL_BUILD_IOS_7
  /* Addendum from RFC 4279, TLS PSK */
  CIPHER_DEF(TLS_PSK_WITH_RC4_128_SHA,                             /* 0x008A */
             "PSK-RC4-SHA",
             CIPHER_WEAK_RC_ENCRYPTION),
  CIPHER_DEF(TLS_PSK_WITH_3DES_EDE_CBC_SHA,                        /* 0x008B */
             "PSK-3DES-EDE-CBC-SHA",
             CIPHER_WEAK_3DES_ENCRYPTION),
  CIPHER_DEF(TLS_PSK_WITH_AES_128_CBC_SHA,                         /* 0x008C */
             "PSK-AES128-CBC-SHA",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_PSK_WITH_AES_256_CBC_SHA,                         /* 0x008D */
             "PSK-AES256-CBC-SHA",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_DHE_PSK_WITH_RC4_128_SHA,                         /* 0x008E */
             "DHE-PSK-RC4-SHA",
             CIPHER_WEAK_RC_ENCRYPTION),
  CIPHER_DEF(TLS_DHE_PSK_WITH_3DES_EDE_CBC_SHA,                    /* 0x008F */
             "DHE-PSK-3DES-EDE-CBC-SHA",
             CIPHER_WEAK_3DES_ENCRYPTION),
  CIPHER_DEF(TLS_DHE_PSK_WITH_AES_128_CBC_SHA,                     /* 0x0090 */
             "DHE-PSK-AES128-CBC-SHA",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_DHE_PSK_WITH_AES_256_CBC_SHA,                     /* 0x0091 */
             "DHE-PSK-AES256-CBC-SHA",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_RSA_PSK_WITH_RC4_128_SHA,                         /* 0x0092 */
             "RSA-PSK-RC4-SHA",
             CIPHER_WEAK_RC_ENCRYPTION),
  CIPHER_DEF(TLS_RSA_PSK_WITH_3DES_EDE_CBC_SHA,                    /* 0x0093 */
             "RSA-PSK-3DES-EDE-CBC-SHA",
             CIPHER_WEAK_3DES_ENCRYPTION),
  CIPHER_DEF(TLS_RSA_PSK_WITH_AES_128_CBC_SHA,                     /* 0x0094 */
             "RSA-PSK-AES128-CBC-SHA",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_RSA_PSK_WITH_AES_256_CBC_SHA,                     /* 0x0095 */
             "RSA-PSK-AES256-CBC-SHA",
             CIPHER_STRONG_ENOUGH),
#endif /* CURL_BUILD_MAC_10_9 || CURL_BUILD_IOS_7 */

#if CURL_BUILD_MAC_10_8 || CURL_BUILD_IOS
  /* Addenda from rfc 5288 AES Galois Counter Mode (GCM) Cipher Suites
     for TLS. */
  CIPHER_DEF(TLS_RSA_WITH_AES_128_GCM_SHA256,                      /* 0x009C */
             "AES128-GCM-SHA256",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_RSA_WITH_AES_256_GCM_SHA384,                      /* 0x009D */
             "AES256-GCM-SHA384",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_DHE_RSA_WITH_AES_128_GCM_SHA256,                  /* 0x009E */
             "DHE-RSA-AES128-GCM-SHA256",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_DHE_RSA_WITH_AES_256_GCM_SHA384,                  /* 0x009F */
             "DHE-RSA-AES256-GCM-SHA384",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_DH_RSA_WITH_AES_128_GCM_SHA256,                   /* 0x00A0 */
             "DH-RSA-AES128-GCM-SHA256",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_DH_RSA_WITH_AES_256_GCM_SHA384,                   /* 0x00A1 */
             "DH-RSA-AES256-GCM-SHA384",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_DHE_DSS_WITH_AES_128_GCM_SHA256,                  /* 0x00A2 */
             "DHE-DSS-AES128-GCM-SHA256",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_DHE_DSS_WITH_AES_256_GCM_SHA384,                  /* 0x00A3 */
             "DHE-DSS-AES256-GCM-SHA384",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_DH_DSS_WITH_AES_128_GCM_SHA256,                   /* 0x00A4 */
             "DH-DSS-AES128-GCM-SHA256",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_DH_DSS_WITH_AES_256_GCM_SHA384,                   /* 0x00A5 */
             "DH-DSS-AES256-GCM-SHA384",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_DH_anon_WITH_AES_128_GCM_SHA256,                  /* 0x00A6 */
             "ADH-AES128-GCM-SHA256",
             CIPHER_WEAK_ANON_AUTH),
  CIPHER_DEF(TLS_DH_anon_WITH_AES_256_GCM_SHA384,                  /* 0x00A7 */
             "ADH-AES256-GCM-SHA384",
             CIPHER_WEAK_ANON_AUTH),
#endif /* CURL_BUILD_MAC_10_8 || CURL_BUILD_IOS */

#if CURL_BUILD_MAC_10_9 || CURL_BUILD_IOS_7
  /* RFC 5487 - PSK with SHA-256/384 and AES GCM */
  CIPHER_DEF(TLS_PSK_WITH_AES_128_GCM_SHA256,                      /* 0x00A8 */
             "PSK-AES128-GCM-SHA256",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_PSK_WITH_AES_256_GCM_SHA384,                      /* 0x00A9 */
             "PSK-AES256-GCM-SHA384",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_DHE_PSK_WITH_AES_128_GCM_SHA256,                  /* 0x00AA */
             "DHE-PSK-AES128-GCM-SHA256",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_DHE_PSK_WITH_AES_256_GCM_SHA384,                  /* 0x00AB */
             "DHE-PSK-AES256-GCM-SHA384",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_RSA_PSK_WITH_AES_128_GCM_SHA256,                  /* 0x00AC */
             "RSA-PSK-AES128-GCM-SHA256",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_RSA_PSK_WITH_AES_256_GCM_SHA384,                  /* 0x00AD */
             "RSA-PSK-AES256-GCM-SHA384",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_PSK_WITH_AES_128_CBC_SHA256,                      /* 0x00AE */
             "PSK-AES128-CBC-SHA256",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_PSK_WITH_AES_256_CBC_SHA384,                      /* 0x00AF */
             "PSK-AES256-CBC-SHA384",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_PSK_WITH_NULL_SHA256,                             /* 0x00B0 */
             "PSK-NULL-SHA256",
             CIPHER_WEAK_NOT_ENCRYPTED),
  CIPHER_DEF(TLS_PSK_WITH_NULL_SHA384,                             /* 0x00B1 */
             "PSK-NULL-SHA384",
             CIPHER_WEAK_NOT_ENCRYPTED),
  CIPHER_DEF(TLS_DHE_PSK_WITH_AES_128_CBC_SHA256,                  /* 0x00B2 */
             "DHE-PSK-AES128-CBC-SHA256",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_DHE_PSK_WITH_AES_256_CBC_SHA384,                  /* 0x00B3 */
             "DHE-PSK-AES256-CBC-SHA384",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_DHE_PSK_WITH_NULL_SHA256,                         /* 0x00B4 */
             "DHE-PSK-NULL-SHA256",
             CIPHER_WEAK_NOT_ENCRYPTED),
  CIPHER_DEF(TLS_DHE_PSK_WITH_NULL_SHA384,                         /* 0x00B5 */
             "DHE-PSK-NULL-SHA384",
             CIPHER_WEAK_NOT_ENCRYPTED),
  CIPHER_DEF(TLS_RSA_PSK_WITH_AES_128_CBC_SHA256,                  /* 0x00B6 */
             "RSA-PSK-AES128-CBC-SHA256",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_RSA_PSK_WITH_AES_256_CBC_SHA384,                  /* 0x00B7 */
             "RSA-PSK-AES256-CBC-SHA384",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_RSA_PSK_WITH_NULL_SHA256,                         /* 0x00B8 */
             "RSA-PSK-NULL-SHA256",
             CIPHER_WEAK_NOT_ENCRYPTED),
  CIPHER_DEF(TLS_RSA_PSK_WITH_NULL_SHA384,                         /* 0x00B9 */
             "RSA-PSK-NULL-SHA384",
             CIPHER_WEAK_NOT_ENCRYPTED),
#endif /* CURL_BUILD_MAC_10_9 || CURL_BUILD_IOS_7 */

  /* RFC 5746 - Secure Renegotiation. This is not a real suite,
     it is a response to initiate negotiation again */
  CIPHER_DEF(TLS_EMPTY_RENEGOTIATION_INFO_SCSV,                    /* 0x00FF */
             NULL,
             CIPHER_STRONG_ENOUGH),

#if CURL_BUILD_MAC_10_13 || CURL_BUILD_IOS_11
  /* TLS 1.3 standard cipher suites for ChaCha20+Poly1305.
     Note: TLS 1.3 ciphersuites do not specify the key exchange
     algorithm -- they only specify the symmetric ciphers.
     Cipher alias name matches to OpenSSL cipher name, and for
     TLS 1.3 ciphers */
  CIPHER_DEF(TLS_AES_128_GCM_SHA256,                               /* 0x1301 */
             NULL,  /* The OpenSSL cipher name matches to the IANA name */
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_AES_256_GCM_SHA384,                               /* 0x1302 */
             NULL,  /* The OpenSSL cipher name matches to the IANA name */
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_CHACHA20_POLY1305_SHA256,                         /* 0x1303 */
             NULL,  /* The OpenSSL cipher name matches to the IANA name */
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_AES_128_CCM_SHA256,                               /* 0x1304 */
             NULL,  /* The OpenSSL cipher name matches to the IANA name */
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_AES_128_CCM_8_SHA256,                             /* 0x1305 */
             NULL,  /* The OpenSSL cipher name matches to the IANA name */
             CIPHER_STRONG_ENOUGH),
#endif /* CURL_BUILD_MAC_10_13 || CURL_BUILD_IOS_11 */

#if CURL_BUILD_MAC_10_6 || CURL_BUILD_IOS
  /* ECDSA addenda, RFC 4492 */
  CIPHER_DEF(TLS_ECDH_ECDSA_WITH_NULL_SHA,                         /* 0xC001 */
             "ECDH-ECDSA-NULL-SHA",
             CIPHER_WEAK_NOT_ENCRYPTED),
  CIPHER_DEF(TLS_ECDH_ECDSA_WITH_RC4_128_SHA,                      /* 0xC002 */
             "ECDH-ECDSA-RC4-SHA",
             CIPHER_WEAK_RC_ENCRYPTION),
  CIPHER_DEF(TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA,                 /* 0xC003 */
             "ECDH-ECDSA-DES-CBC3-SHA",
             CIPHER_WEAK_3DES_ENCRYPTION),
  CIPHER_DEF(TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA,                  /* 0xC004 */
             "ECDH-ECDSA-AES128-SHA",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA,                  /* 0xC005 */
             "ECDH-ECDSA-AES256-SHA",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_ECDHE_ECDSA_WITH_NULL_SHA,                        /* 0xC006 */
             "ECDHE-ECDSA-NULL-SHA",
             CIPHER_WEAK_NOT_ENCRYPTED),
  CIPHER_DEF(TLS_ECDHE_ECDSA_WITH_RC4_128_SHA,                     /* 0xC007 */
             "ECDHE-ECDSA-RC4-SHA",
             CIPHER_WEAK_RC_ENCRYPTION),
  CIPHER_DEF(TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA,                /* 0xC008 */
             "ECDHE-ECDSA-DES-CBC3-SHA",
             CIPHER_WEAK_3DES_ENCRYPTION),
  CIPHER_DEF(TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,                 /* 0xC009 */
             "ECDHE-ECDSA-AES128-SHA",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,                 /* 0xC00A */
             "ECDHE-ECDSA-AES256-SHA",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_ECDH_RSA_WITH_NULL_SHA,                           /* 0xC00B */
             "ECDH-RSA-NULL-SHA",
             CIPHER_WEAK_NOT_ENCRYPTED),
  CIPHER_DEF(TLS_ECDH_RSA_WITH_RC4_128_SHA,                        /* 0xC00C */
             "ECDH-RSA-RC4-SHA",
             CIPHER_WEAK_RC_ENCRYPTION),
  CIPHER_DEF(TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA,                   /* 0xC00D */
             "ECDH-RSA-DES-CBC3-SHA",
             CIPHER_WEAK_3DES_ENCRYPTION),
  CIPHER_DEF(TLS_ECDH_RSA_WITH_AES_128_CBC_SHA,                    /* 0xC00E */
             "ECDH-RSA-AES128-SHA",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_ECDH_RSA_WITH_AES_256_CBC_SHA,                    /* 0xC00F */
             "ECDH-RSA-AES256-SHA",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_ECDHE_RSA_WITH_NULL_SHA,                          /* 0xC010 */
             "ECDHE-RSA-NULL-SHA",
             CIPHER_WEAK_NOT_ENCRYPTED),
  CIPHER_DEF(TLS_ECDHE_RSA_WITH_RC4_128_SHA,                       /* 0xC011 */
             "ECDHE-RSA-RC4-SHA",
             CIPHER_WEAK_RC_ENCRYPTION),
  CIPHER_DEF(TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,                  /* 0xC012 */
             "ECDHE-RSA-DES-CBC3-SHA",
             CIPHER_WEAK_3DES_ENCRYPTION),
  CIPHER_DEF(TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,                   /* 0xC013 */
             "ECDHE-RSA-AES128-SHA",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,                   /* 0xC014 */
             "ECDHE-RSA-AES256-SHA",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_ECDH_anon_WITH_NULL_SHA,                          /* 0xC015 */
             "AECDH-NULL-SHA",
             CIPHER_WEAK_ANON_AUTH),
  CIPHER_DEF(TLS_ECDH_anon_WITH_RC4_128_SHA,                       /* 0xC016 */
             "AECDH-RC4-SHA",
             CIPHER_WEAK_ANON_AUTH),
  CIPHER_DEF(TLS_ECDH_anon_WITH_3DES_EDE_CBC_SHA,                  /* 0xC017 */
             "AECDH-DES-CBC3-SHA",
             CIPHER_WEAK_3DES_ENCRYPTION),
  CIPHER_DEF(TLS_ECDH_anon_WITH_AES_128_CBC_SHA,                   /* 0xC018 */
             "AECDH-AES128-SHA",
             CIPHER_WEAK_ANON_AUTH),
  CIPHER_DEF(TLS_ECDH_anon_WITH_AES_256_CBC_SHA,                   /* 0xC019 */
             "AECDH-AES256-SHA",
             CIPHER_WEAK_ANON_AUTH),
#endif /* CURL_BUILD_MAC_10_6 || CURL_BUILD_IOS */

#if CURL_BUILD_MAC_10_8 || CURL_BUILD_IOS
  /* Addenda from rfc 5289  Elliptic Curve Cipher Suites with
     HMAC SHA-256/384. */
  CIPHER_DEF(TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,              /* 0xC023 */
             "ECDHE-ECDSA-AES128-SHA256",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384,              /* 0xC024 */
             "ECDHE-ECDSA-AES256-SHA384",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA256,               /* 0xC025 */
             "ECDH-ECDSA-AES128-SHA256",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA384,               /* 0xC026 */
             "ECDH-ECDSA-AES256-SHA384",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,                /* 0xC027 */
             "ECDHE-RSA-AES128-SHA256",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384,                /* 0xC028 */
             "ECDHE-RSA-AES256-SHA384",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_ECDH_RSA_WITH_AES_128_CBC_SHA256,                 /* 0xC029 */
             "ECDH-RSA-AES128-SHA256",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_ECDH_RSA_WITH_AES_256_CBC_SHA384,                 /* 0xC02A */
             "ECDH-RSA-AES256-SHA384",
             CIPHER_STRONG_ENOUGH),
  /* Addenda from rfc 5289  Elliptic Curve Cipher Suites with
     SHA-256/384 and AES Galois Counter Mode (GCM) */
  CIPHER_DEF(TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,              /* 0xC02B */
             "ECDHE-ECDSA-AES128-GCM-SHA256",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,              /* 0xC02C */
             "ECDHE-ECDSA-AES256-GCM-SHA384",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_ECDH_ECDSA_WITH_AES_128_GCM_SHA256,               /* 0xC02D */
             "ECDH-ECDSA-AES128-GCM-SHA256",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_ECDH_ECDSA_WITH_AES_256_GCM_SHA384,               /* 0xC02E */
             "ECDH-ECDSA-AES256-GCM-SHA384",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,                /* 0xC02F */
             "ECDHE-RSA-AES128-GCM-SHA256",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,                /* 0xC030 */
             "ECDHE-RSA-AES256-GCM-SHA384",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_ECDH_RSA_WITH_AES_128_GCM_SHA256,                 /* 0xC031 */
             "ECDH-RSA-AES128-GCM-SHA256",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_ECDH_RSA_WITH_AES_256_GCM_SHA384,                 /* 0xC032 */
             "ECDH-RSA-AES256-GCM-SHA384",
             CIPHER_STRONG_ENOUGH),
#endif /* CURL_BUILD_MAC_10_8 || CURL_BUILD_IOS */

#if CURL_BUILD_MAC_10_15 || CURL_BUILD_IOS_13
  /* ECDHE_PSK Cipher Suites for Transport Layer Security (TLS), RFC 5489 */
  CIPHER_DEF(TLS_ECDHE_PSK_WITH_AES_128_CBC_SHA,                   /* 0xC035 */
             "ECDHE-PSK-AES128-CBC-SHA",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_ECDHE_PSK_WITH_AES_256_CBC_SHA,                   /* 0xC036 */
             "ECDHE-PSK-AES256-CBC-SHA",
             CIPHER_STRONG_ENOUGH),
#endif /* CURL_BUILD_MAC_10_15 || CURL_BUILD_IOS_13 */

#if CURL_BUILD_MAC_10_13 || CURL_BUILD_IOS_11
  /* Addenda from rfc 7905  ChaCha20-Poly1305 Cipher Suites for
     Transport Layer Security (TLS). */
  CIPHER_DEF(TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256,          /* 0xCCA8 */
             "ECDHE-RSA-CHACHA20-POLY1305",
             CIPHER_STRONG_ENOUGH),
  CIPHER_DEF(TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256,        /* 0xCCA9 */
             "ECDHE-ECDSA-CHACHA20-POLY1305",
             CIPHER_STRONG_ENOUGH),
#endif /* CURL_BUILD_MAC_10_13 || CURL_BUILD_IOS_11 */

#if CURL_BUILD_MAC_10_15 || CURL_BUILD_IOS_13
  /* ChaCha20-Poly1305 Cipher Suites for Transport Layer Security (TLS),
     RFC 7905 */
  CIPHER_DEF(TLS_PSK_WITH_CHACHA20_POLY1305_SHA256,                /* 0xCCAB */
             "PSK-CHACHA20-POLY1305",
             CIPHER_STRONG_ENOUGH),
#endif /* CURL_BUILD_MAC_10_15 || CURL_BUILD_IOS_13 */

  /* Tags for SSL 2 cipher kinds which are not specified for SSL 3.
     Defined since SDK 10.2.8 */
  CIPHER_DEF(SSL_RSA_WITH_RC2_CBC_MD5,                             /* 0xFF80 */
             NULL,
             CIPHER_WEAK_RC_ENCRYPTION),
  CIPHER_DEF(SSL_RSA_WITH_IDEA_CBC_MD5,                            /* 0xFF81 */
             NULL,
             CIPHER_WEAK_IDEA_ENCRYPTION),
  CIPHER_DEF(SSL_RSA_WITH_DES_CBC_MD5,                             /* 0xFF82 */
             NULL,
             CIPHER_WEAK_DES_ENCRYPTION),
  CIPHER_DEF(SSL_RSA_WITH_3DES_EDE_CBC_MD5,                        /* 0xFF83 */
             NULL,
             CIPHER_WEAK_3DES_ENCRYPTION),
};

#define NUM_OF_CIPHERS sizeof(ciphertable)/sizeof(ciphertable[0])


/* pinned public key support tests */

/* version 1 supports macOS 10.12+ and iOS 10+ */
#if ((TARGET_OS_IPHONE && __IPHONE_OS_VERSION_MIN_REQUIRED >= 100000) || \
    (!TARGET_OS_IPHONE && __MAC_OS_X_VERSION_MIN_REQUIRED  >= 101200))
#define SECTRANSP_PINNEDPUBKEY_V1 1
#endif

/* version 2 supports MacOSX 10.7+ */
#if (!TARGET_OS_IPHONE && __MAC_OS_X_VERSION_MIN_REQUIRED >= 1070)
#define SECTRANSP_PINNEDPUBKEY_V2 1
#endif

#if defined(SECTRANSP_PINNEDPUBKEY_V1) || defined(SECTRANSP_PINNEDPUBKEY_V2)
/* this backend supports CURLOPT_PINNEDPUBLICKEY */
#define SECTRANSP_PINNEDPUBKEY 1
#endif /* SECTRANSP_PINNEDPUBKEY */

#ifdef SECTRANSP_PINNEDPUBKEY
/* both new and old APIs return rsa keys missing the spki header (not DER) */
static const unsigned char rsa4096SpkiHeader[] = {
                                       0x30, 0x82, 0x02, 0x22, 0x30, 0x0d,
                                       0x06, 0x09, 0x2a, 0x86, 0x48, 0x86,
                                       0xf7, 0x0d, 0x01, 0x01, 0x01, 0x05,
                                       0x00, 0x03, 0x82, 0x02, 0x0f, 0x00};

static const unsigned char rsa2048SpkiHeader[] = {
                                       0x30, 0x82, 0x01, 0x22, 0x30, 0x0d,
                                       0x06, 0x09, 0x2a, 0x86, 0x48, 0x86,
                                       0xf7, 0x0d, 0x01, 0x01, 0x01, 0x05,
                                       0x00, 0x03, 0x82, 0x01, 0x0f, 0x00};
#ifdef SECTRANSP_PINNEDPUBKEY_V1
/* the *new* version doesn't return DER encoded ecdsa certs like the old... */
static const unsigned char ecDsaSecp256r1SpkiHeader[] = {
                                       0x30, 0x59, 0x30, 0x13, 0x06, 0x07,
                                       0x2a, 0x86, 0x48, 0xce, 0x3d, 0x02,
                                       0x01, 0x06, 0x08, 0x2a, 0x86, 0x48,
                                       0xce, 0x3d, 0x03, 0x01, 0x07, 0x03,
                                       0x42, 0x00};

static const unsigned char ecDsaSecp384r1SpkiHeader[] = {
                                       0x30, 0x76, 0x30, 0x10, 0x06, 0x07,
                                       0x2a, 0x86, 0x48, 0xce, 0x3d, 0x02,
                                       0x01, 0x06, 0x05, 0x2b, 0x81, 0x04,
                                       0x00, 0x22, 0x03, 0x62, 0x00};
#endif /* SECTRANSP_PINNEDPUBKEY_V1 */
#endif /* SECTRANSP_PINNEDPUBKEY */

/* The following two functions were ripped from Apple sample code,
 * with some modifications: */
static OSStatus SocketRead(SSLConnectionRef connection,
                           void *data,          /* owned by
                                                 * caller, data
                                                 * RETURNED */
                           size_t *dataLength)  /* IN/OUT */
{
  size_t bytesToGo = *dataLength;
  size_t initLen = bytesToGo;
  UInt8 *currData = (UInt8 *)data;
  /*int sock = *(int *)connection;*/
  struct ssl_connect_data *connssl = (struct ssl_connect_data *)connection;
  struct ssl_backend_data *backend = connssl->backend;
  int sock;
  OSStatus rtn = noErr;
  size_t bytesRead;
  ssize_t rrtn;
  int theErr;

  DEBUGASSERT(backend);
  sock = backend->ssl_sockfd;
  *dataLength = 0;

  for(;;) {
    bytesRead = 0;
    rrtn = read(sock, currData, bytesToGo);
    if(rrtn <= 0) {
      /* this is guesswork... */
      theErr = errno;
      if(rrtn == 0) { /* EOF = server hung up */
        /* the framework will turn this into errSSLClosedNoNotify */
        rtn = errSSLClosedGraceful;
      }
      else /* do the switch */
        switch(theErr) {
          case ENOENT:
            /* connection closed */
            rtn = errSSLClosedGraceful;
            break;
          case ECONNRESET:
            rtn = errSSLClosedAbort;
            break;
          case EAGAIN:
            rtn = errSSLWouldBlock;
            backend->ssl_direction = false;
            break;
          default:
            rtn = ioErr;
            break;
        }
      break;
    }
    else {
      bytesRead = rrtn;
    }
    bytesToGo -= bytesRead;
    currData  += bytesRead;

    if(bytesToGo == 0) {
      /* filled buffer with incoming data, done */
      break;
    }
  }
  *dataLength = initLen - bytesToGo;

  return rtn;
}

static OSStatus SocketWrite(SSLConnectionRef connection,
                            const void *data,
                            size_t *dataLength)  /* IN/OUT */
{
  size_t bytesSent = 0;
  /*int sock = *(int *)connection;*/
  struct ssl_connect_data *connssl = (struct ssl_connect_data *)connection;
  struct ssl_backend_data *backend = connssl->backend;
  int sock;
  ssize_t length;
  size_t dataLen = *dataLength;
  const UInt8 *dataPtr = (UInt8 *)data;
  OSStatus ortn;
  int theErr;

  DEBUGASSERT(backend);
  sock = backend->ssl_sockfd;
  *dataLength = 0;

  do {
    length = write(sock,
                   (char *)dataPtr + bytesSent,
                   dataLen - bytesSent);
  } while((length > 0) &&
           ( (bytesSent += length) < dataLen) );

  if(length <= 0) {
    theErr = errno;
    if(theErr == EAGAIN) {
      ortn = errSSLWouldBlock;
      backend->ssl_direction = true;
    }
    else {
      ortn = ioErr;
    }
  }
  else {
    ortn = noErr;
  }
  *dataLength = bytesSent;
  return ortn;
}

#ifndef CURL_DISABLE_VERBOSE_STRINGS
CF_INLINE const char *TLSCipherNameForNumber(SSLCipherSuite cipher)
{
  /* The first ciphers in the ciphertable are continuous. Here we do small
     optimization and instead of loop directly get SSL name by cipher number.
  */
  if(cipher <= SSL_FORTEZZA_DMS_WITH_FORTEZZA_CBC_SHA) {
    return ciphertable[cipher].name;
  }
  /* Iterate through the rest of the ciphers */
  for(size_t i = SSL_FORTEZZA_DMS_WITH_FORTEZZA_CBC_SHA + 1;
      i < NUM_OF_CIPHERS;
      ++i) {
    if(ciphertable[i].num == cipher) {
      return ciphertable[i].name;
    }
  }
  return ciphertable[SSL_NULL_WITH_NULL_NULL].name;
}
#endif /* !CURL_DISABLE_VERBOSE_STRINGS */

#if CURL_BUILD_MAC
CF_INLINE void GetDarwinVersionNumber(int *major, int *minor)
{
  int mib[2];
  char *os_version;
  size_t os_version_len;
  char *os_version_major, *os_version_minor;
  char *tok_buf;

  /* Get the Darwin kernel version from the kernel using sysctl(): */
  mib[0] = CTL_KERN;
  mib[1] = KERN_OSRELEASE;
  if(sysctl(mib, 2, NULL, &os_version_len, NULL, 0) == -1)
    return;
  os_version = malloc(os_version_len*sizeof(char));
  if(!os_version)
    return;
  if(sysctl(mib, 2, os_version, &os_version_len, NULL, 0) == -1) {
    free(os_version);
    return;
  }

  /* Parse the version: */
  os_version_major = strtok_r(os_version, ".", &tok_buf);
  os_version_minor = strtok_r(NULL, ".", &tok_buf);
  *major = atoi(os_version_major);
  *minor = atoi(os_version_minor);
  free(os_version);
}
#endif /* CURL_BUILD_MAC */

/* Apple provides a myriad of ways of getting information about a certificate
   into a string. Some aren't available under iOS or newer cats. So here's
   a unified function for getting a string describing the certificate that
   ought to work in all cats starting with Leopard. */
CF_INLINE CFStringRef getsubject(SecCertificateRef cert)
{
  CFStringRef server_cert_summary = CFSTR("(null)");

#if CURL_BUILD_IOS
  /* iOS: There's only one way to do this. */
  server_cert_summary = SecCertificateCopySubjectSummary(cert);
#else
#if CURL_BUILD_MAC_10_7
  /* Lion & later: Get the long description if we can. */
  if(SecCertificateCopyLongDescription)
    server_cert_summary =
      SecCertificateCopyLongDescription(NULL, cert, NULL);
  else
#endif /* CURL_BUILD_MAC_10_7 */
#if CURL_BUILD_MAC_10_6
  /* Snow Leopard: Get the certificate summary. */
  if(SecCertificateCopySubjectSummary)
    server_cert_summary = SecCertificateCopySubjectSummary(cert);
  else
#endif /* CURL_BUILD_MAC_10_6 */
  /* Leopard is as far back as we go... */
  (void)SecCertificateCopyCommonName(cert, &server_cert_summary);
#endif /* CURL_BUILD_IOS */
  return server_cert_summary;
}

static CURLcode CopyCertSubject(struct Curl_easy *data,
                                SecCertificateRef cert, char **certp)
{
  CFStringRef c = getsubject(cert);
  CURLcode result = CURLE_OK;
  const char *direct;
  char *cbuf = NULL;
  *certp = NULL;

  if(!c) {
    failf(data, "SSL: invalid CA certificate subject");
    return CURLE_PEER_FAILED_VERIFICATION;
  }

  /* If the subject is already available as UTF-8 encoded (ie 'direct') then
     use that, else convert it. */
  direct = CFStringGetCStringPtr(c, kCFStringEncodingUTF8);
  if(direct) {
    *certp = strdup(direct);
    if(!*certp) {
      failf(data, "SSL: out of memory");
      result = CURLE_OUT_OF_MEMORY;
    }
  }
  else {
    size_t cbuf_size = ((size_t)CFStringGetLength(c) * 4) + 1;
    cbuf = calloc(cbuf_size, 1);
    if(cbuf) {
      if(!CFStringGetCString(c, cbuf, cbuf_size,
                             kCFStringEncodingUTF8)) {
        failf(data, "SSL: invalid CA certificate subject");
        result = CURLE_PEER_FAILED_VERIFICATION;
      }
      else
        /* pass back the buffer */
        *certp = cbuf;
    }
    else {
      failf(data, "SSL: couldn't allocate %zu bytes of memory", cbuf_size);
      result = CURLE_OUT_OF_MEMORY;
    }
  }
  if(result)
    free(cbuf);
  CFRelease(c);
  return result;
}

#if CURL_SUPPORT_MAC_10_6
/* The SecKeychainSearch API was deprecated in Lion, and using it will raise
   deprecation warnings, so let's not compile this unless it's necessary: */
static OSStatus CopyIdentityWithLabelOldSchool(char *label,
                                               SecIdentityRef *out_c_a_k)
{
  OSStatus status = errSecItemNotFound;
  SecKeychainAttributeList attr_list;
  SecKeychainAttribute attr;
  SecKeychainSearchRef search = NULL;
  SecCertificateRef cert = NULL;

  /* Set up the attribute list: */
  attr_list.count = 1L;
  attr_list.attr = &attr;

  /* Set up our lone search criterion: */
  attr.tag = kSecLabelItemAttr;
  attr.data = label;
  attr.length = (UInt32)strlen(label);

  /* Start searching: */
  status = SecKeychainSearchCreateFromAttributes(NULL,
                                                 kSecCertificateItemClass,
                                                 &attr_list,
                                                 &search);
  if(status == noErr) {
    status = SecKeychainSearchCopyNext(search,
                                       (SecKeychainItemRef *)&cert);
    if(status == noErr && cert) {
      /* If we found a certificate, does it have a private key? */
      status = SecIdentityCreateWithCertificate(NULL, cert, out_c_a_k);
      CFRelease(cert);
    }
  }

  if(search)
    CFRelease(search);
  return status;
}
#endif /* CURL_SUPPORT_MAC_10_6 */

static OSStatus CopyIdentityWithLabel(char *label,
                                      SecIdentityRef *out_cert_and_key)
{
  OSStatus status = errSecItemNotFound;

#if CURL_BUILD_MAC_10_7 || CURL_BUILD_IOS
  CFArrayRef keys_list;
  CFIndex keys_list_count;
  CFIndex i;
  CFStringRef common_name;

  /* SecItemCopyMatching() was introduced in iOS and Snow Leopard.
     kSecClassIdentity was introduced in Lion. If both exist, let's use them
     to find the certificate. */
  if(SecItemCopyMatching && kSecClassIdentity) {
    CFTypeRef keys[5];
    CFTypeRef values[5];
    CFDictionaryRef query_dict;
    CFStringRef label_cf = CFStringCreateWithCString(NULL, label,
      kCFStringEncodingUTF8);

    /* Set up our search criteria and expected results: */
    values[0] = kSecClassIdentity; /* we want a certificate and a key */
    keys[0] = kSecClass;
    values[1] = kCFBooleanTrue;    /* we want a reference */
    keys[1] = kSecReturnRef;
    values[2] = kSecMatchLimitAll; /* kSecMatchLimitOne would be better if the
                                    * label matching below worked correctly */
    keys[2] = kSecMatchLimit;
    /* identity searches need a SecPolicyRef in order to work */
    values[3] = SecPolicyCreateSSL(false, NULL);
    keys[3] = kSecMatchPolicy;
    /* match the name of the certificate (doesn't work in macOS 10.12.1) */
    values[4] = label_cf;
    keys[4] = kSecAttrLabel;
    query_dict = CFDictionaryCreate(NULL, (const void **)keys,
                                    (const void **)values, 5L,
                                    &kCFCopyStringDictionaryKeyCallBacks,
                                    &kCFTypeDictionaryValueCallBacks);
    CFRelease(values[3]);

    /* Do we have a match? */
    status = SecItemCopyMatching(query_dict, (CFTypeRef *) &keys_list);

    /* Because kSecAttrLabel matching doesn't work with kSecClassIdentity,
     * we need to find the correct identity ourselves */
    if(status == noErr) {
      keys_list_count = CFArrayGetCount(keys_list);
      *out_cert_and_key = NULL;
      status = 1;
      for(i = 0; i<keys_list_count; i++) {
        OSStatus err = noErr;
        SecCertificateRef cert = NULL;
        SecIdentityRef identity =
          (SecIdentityRef) CFArrayGetValueAtIndex(keys_list, i);
        err = SecIdentityCopyCertificate(identity, &cert);
        if(err == noErr) {
          OSStatus copy_status = noErr;
#if CURL_BUILD_IOS
          common_name = SecCertificateCopySubjectSummary(cert);
#elif CURL_BUILD_MAC_10_7
          copy_status = SecCertificateCopyCommonName(cert, &common_name);
#endif
          if(copy_status == noErr &&
            CFStringCompare(common_name, label_cf, 0) == kCFCompareEqualTo) {
            CFRelease(cert);
            CFRelease(common_name);
            CFRetain(identity);
            *out_cert_and_key = identity;
            status = noErr;
            break;
          }
          CFRelease(common_name);
        }
        CFRelease(cert);
      }
    }

    if(keys_list)
      CFRelease(keys_list);
    CFRelease(query_dict);
    CFRelease(label_cf);
  }
  else {
#if CURL_SUPPORT_MAC_10_6
    /* On Leopard and Snow Leopard, fall back to SecKeychainSearch. */
    status = CopyIdentityWithLabelOldSchool(label, out_cert_and_key);
#endif /* CURL_SUPPORT_MAC_10_6 */
  }
#elif CURL_SUPPORT_MAC_10_6
  /* For developers building on older cats, we have no choice but to fall back
     to SecKeychainSearch. */
  status = CopyIdentityWithLabelOldSchool(label, out_cert_and_key);
#endif /* CURL_BUILD_MAC_10_7 || CURL_BUILD_IOS */
  return status;
}

static OSStatus CopyIdentityFromPKCS12File(const char *cPath,
                                           const struct curl_blob *blob,
                                           const char *cPassword,
                                           SecIdentityRef *out_cert_and_key)
{
  OSStatus status = errSecItemNotFound;
  CFURLRef pkcs_url = NULL;
  CFStringRef password = cPassword ? CFStringCreateWithCString(NULL,
    cPassword, kCFStringEncodingUTF8) : NULL;
  CFDataRef pkcs_data = NULL;

  /* We can import P12 files on iOS or OS X 10.7 or later: */
  /* These constants are documented as having first appeared in 10.6 but they
     raise linker errors when used on that cat for some reason. */
#if CURL_BUILD_MAC_10_7 || CURL_BUILD_IOS
  bool resource_imported;

  if(blob) {
    pkcs_data = CFDataCreate(kCFAllocatorDefault,
                             (const unsigned char *)blob->data, blob->len);
    status = (pkcs_data != NULL) ? errSecSuccess : errSecAllocate;
    resource_imported = (pkcs_data != NULL);
  }
  else {
    pkcs_url =
      CFURLCreateFromFileSystemRepresentation(NULL,
                                              (const UInt8 *)cPath,
                                              strlen(cPath), false);
    resource_imported =
      CFURLCreateDataAndPropertiesFromResource(NULL,
                                               pkcs_url, &pkcs_data,
                                               NULL, NULL, &status);
  }

  if(resource_imported) {
    CFArrayRef items = NULL;

  /* On iOS SecPKCS12Import will never add the client certificate to the
   * Keychain.
   *
   * It gives us back a SecIdentityRef that we can use directly. */
#if CURL_BUILD_IOS
    const void *cKeys[] = {kSecImportExportPassphrase};
    const void *cValues[] = {password};
    CFDictionaryRef options = CFDictionaryCreate(NULL, cKeys, cValues,
      password ? 1L : 0L, NULL, NULL);

    if(options) {
      status = SecPKCS12Import(pkcs_data, options, &items);
      CFRelease(options);
    }


  /* On macOS SecPKCS12Import will always add the client certificate to
   * the Keychain.
   *
   * As this doesn't match iOS, and apps may not want to see their client
   * certificate saved in the user's keychain, we use SecItemImport
   * with a NULL keychain to avoid importing it.
   *
   * This returns a SecCertificateRef from which we can construct a
   * SecIdentityRef.
   */
#elif CURL_BUILD_MAC_10_7
    SecItemImportExportKeyParameters keyParams;
    SecExternalFormat inputFormat = kSecFormatPKCS12;
    SecExternalItemType inputType = kSecItemTypeCertificate;

    memset(&keyParams, 0x00, sizeof(keyParams));
    keyParams.version    = SEC_KEY_IMPORT_EXPORT_PARAMS_VERSION;
    keyParams.passphrase = password;

    status = SecItemImport(pkcs_data, NULL, &inputFormat, &inputType,
                           0, &keyParams, NULL, &items);
#endif


    /* Extract the SecIdentityRef */
    if(status == errSecSuccess && items && CFArrayGetCount(items)) {
      CFIndex i, count;
      count = CFArrayGetCount(items);

      for(i = 0; i < count; i++) {
        CFTypeRef item = (CFTypeRef) CFArrayGetValueAtIndex(items, i);
        CFTypeID  itemID = CFGetTypeID(item);

        if(itemID == CFDictionaryGetTypeID()) {
          CFTypeRef identity = (CFTypeRef) CFDictionaryGetValue(
                                                 (CFDictionaryRef) item,
                                                 kSecImportItemIdentity);
          CFRetain(identity);
          *out_cert_and_key = (SecIdentityRef) identity;
          break;
        }
#if CURL_BUILD_MAC_10_7
        else if(itemID == SecCertificateGetTypeID()) {
          status = SecIdentityCreateWithCertificate(NULL,
                                                 (SecCertificateRef) item,
                                                 out_cert_and_key);
          break;
        }
#endif
      }
    }

    if(items)
      CFRelease(items);
    CFRelease(pkcs_data);
  }
#endif /* CURL_BUILD_MAC_10_7 || CURL_BUILD_IOS */
  if(password)
    CFRelease(password);
  if(pkcs_url)
    CFRelease(pkcs_url);
  return status;
}

/* This code was borrowed from nss.c, with some modifications:
 * Determine whether the nickname passed in is a filename that needs to
 * be loaded as a PEM or a regular NSS nickname.
 *
 * returns 1 for a file
 * returns 0 for not a file
 */
CF_INLINE bool is_file(const char *filename)
{
  struct_stat st;

  if(!filename)
    return false;

  if(stat(filename, &st) == 0)
    return S_ISREG(st.st_mode);
  return false;
}

#if CURL_BUILD_MAC_10_8 || CURL_BUILD_IOS
static CURLcode sectransp_version_from_curl(SSLProtocol *darwinver,
                                            long ssl_version)
{
  switch(ssl_version) {
    case CURL_SSLVERSION_TLSv1_0:
      *darwinver = kTLSProtocol1;
      return CURLE_OK;
    case CURL_SSLVERSION_TLSv1_1:
      *darwinver = kTLSProtocol11;
      return CURLE_OK;
    case CURL_SSLVERSION_TLSv1_2:
      *darwinver = kTLSProtocol12;
      return CURLE_OK;
    case CURL_SSLVERSION_TLSv1_3:
      /* TLS 1.3 support first appeared in iOS 11 and macOS 10.13 */
#if (CURL_BUILD_MAC_10_13 || CURL_BUILD_IOS_11) && HAVE_BUILTIN_AVAILABLE == 1
      if(__builtin_available(macOS 10.13, iOS 11.0, *)) {
        *darwinver = kTLSProtocol13;
        return CURLE_OK;
      }
#endif /* (CURL_BUILD_MAC_10_13 || CURL_BUILD_IOS_11) &&
          HAVE_BUILTIN_AVAILABLE == 1 */
      break;
  }
  return CURLE_SSL_CONNECT_ERROR;
}
#endif

static CURLcode
set_ssl_version_min_max(struct Curl_easy *data, struct connectdata *conn,
                        int sockindex)
{
  struct ssl_connect_data *connssl = &conn->ssl[sockindex];
  struct ssl_backend_data *backend = connssl->backend;
  long ssl_version = SSL_CONN_CONFIG(version);
  long ssl_version_max = SSL_CONN_CONFIG(version_max);
  long max_supported_version_by_os;

  DEBUGASSERT(backend);

  /* macOS 10.5-10.7 supported TLS 1.0 only.
     macOS 10.8 and later, and iOS 5 and later, added TLS 1.1 and 1.2.
     macOS 10.13 and later, and iOS 11 and later, added TLS 1.3. */
#if (CURL_BUILD_MAC_10_13 || CURL_BUILD_IOS_11) && HAVE_BUILTIN_AVAILABLE == 1
  if(__builtin_available(macOS 10.13, iOS 11.0, *)) {
    max_supported_version_by_os = CURL_SSLVERSION_MAX_TLSv1_3;
  }
  else {
    max_supported_version_by_os = CURL_SSLVERSION_MAX_TLSv1_2;
  }
#else
  max_supported_version_by_os = CURL_SSLVERSION_MAX_TLSv1_2;
#endif /* (CURL_BUILD_MAC_10_13 || CURL_BUILD_IOS_11) &&
          HAVE_BUILTIN_AVAILABLE == 1 */

  switch(ssl_version) {
    case CURL_SSLVERSION_DEFAULT:
    case CURL_SSLVERSION_TLSv1:
      ssl_version = CURL_SSLVERSION_TLSv1_0;
      break;
  }

  switch(ssl_version_max) {
    case CURL_SSLVERSION_MAX_NONE:
    case CURL_SSLVERSION_MAX_DEFAULT:
      ssl_version_max = max_supported_version_by_os;
      break;
  }

#if CURL_BUILD_MAC_10_8 || CURL_BUILD_IOS
  if(SSLSetProtocolVersionMax) {
    SSLProtocol darwin_ver_min = kTLSProtocol1;
    SSLProtocol darwin_ver_max = kTLSProtocol1;
    CURLcode result = sectransp_version_from_curl(&darwin_ver_min,
                                                  ssl_version);
    if(result) {
      failf(data, "unsupported min version passed via CURLOPT_SSLVERSION");
      return result;
    }
    result = sectransp_version_from_curl(&darwin_ver_max,
                                         ssl_version_max >> 16);
    if(result) {
      failf(data, "unsupported max version passed via CURLOPT_SSLVERSION");
      return result;
    }

    (void)SSLSetProtocolVersionMin(backend->ssl_ctx, darwin_ver_min);
    (void)SSLSetProtocolVersionMax(backend->ssl_ctx, darwin_ver_max);
    return result;
  }
  else {
#if CURL_SUPPORT_MAC_10_8
    long i = ssl_version;
    (void)SSLSetProtocolVersionEnabled(backend->ssl_ctx,
                                       kSSLProtocolAll,
                                       false);
    for(; i <= (ssl_version_max >> 16); i++) {
      switch(i) {
        case CURL_SSLVERSION_TLSv1_0:
          (void)SSLSetProtocolVersionEnabled(backend->ssl_ctx,
                                            kTLSProtocol1,
                                            true);
          break;
        case CURL_SSLVERSION_TLSv1_1:
          (void)SSLSetProtocolVersionEnabled(backend->ssl_ctx,
                                            kTLSProtocol11,
                                            true);
          break;
        case CURL_SSLVERSION_TLSv1_2:
          (void)SSLSetProtocolVersionEnabled(backend->ssl_ctx,
                                            kTLSProtocol12,
                                            true);
          break;
        case CURL_SSLVERSION_TLSv1_3:
          failf(data, "Your version of the OS does not support TLSv1.3");
          return CURLE_SSL_CONNECT_ERROR;
      }
    }
    return CURLE_OK;
#endif  /* CURL_SUPPORT_MAC_10_8 */
  }
#endif  /* CURL_BUILD_MAC_10_8 || CURL_BUILD_IOS */
  failf(data, "Secure Transport: cannot set SSL protocol");
  return CURLE_SSL_CONNECT_ERROR;
}

static bool is_cipher_suite_strong(SSLCipherSuite suite_num)
{
  for(size_t i = 0; i < NUM_OF_CIPHERS; ++i) {
    if(ciphertable[i].num == suite_num) {
      return !ciphertable[i].weak;
    }
  }
  /* If the cipher is not in our list, assume it is a new one
     and therefore strong. Previous implementation was the same,
     if cipher suite is not in the list, it was considered strong enough */
  return true;
}

static bool is_separator(char c)
{
  /* Return whether character is a cipher list separator. */
  switch(c) {
  case ' ':
  case '\t':
  case ':':
  case ',':
  case ';':
    return true;
  }
  return false;
}

static CURLcode sectransp_set_default_ciphers(struct Curl_easy *data,
                                              SSLContextRef ssl_ctx)
{
  size_t all_ciphers_count = 0UL, allowed_ciphers_count = 0UL, i;
  SSLCipherSuite *all_ciphers = NULL, *allowed_ciphers = NULL;
  OSStatus err = noErr;

#if CURL_BUILD_MAC
  int darwinver_maj = 0, darwinver_min = 0;

  GetDarwinVersionNumber(&darwinver_maj, &darwinver_min);
#endif /* CURL_BUILD_MAC */

  /* Disable cipher suites that ST supports but are not safe. These ciphers
     are unlikely to be used in any case since ST gives other ciphers a much
     higher priority, but it's probably better that we not connect at all than
     to give the user a false sense of security if the server only supports
     insecure ciphers. (Note: We don't care about SSLv2-only ciphers.) */
  err = SSLGetNumberSupportedCiphers(ssl_ctx, &all_ciphers_count);
  if(err != noErr) {
    failf(data, "SSL: SSLGetNumberSupportedCiphers() failed: OSStatus %d",
          err);
    return CURLE_SSL_CIPHER;
  }
  all_ciphers = malloc(all_ciphers_count*sizeof(SSLCipherSuite));
  if(!all_ciphers) {
    failf(data, "SSL: Failed to allocate memory for all ciphers");
    return CURLE_OUT_OF_MEMORY;
  }
  allowed_ciphers = malloc(all_ciphers_count*sizeof(SSLCipherSuite));
  if(!allowed_ciphers) {
    Curl_safefree(all_ciphers);
    failf(data, "SSL: Failed to allocate memory for allowed ciphers");
    return CURLE_OUT_OF_MEMORY;
  }
  err = SSLGetSupportedCiphers(ssl_ctx, all_ciphers,
                               &all_ciphers_count);
  if(err != noErr) {
    Curl_safefree(all_ciphers);
    Curl_safefree(allowed_ciphers);
    return CURLE_SSL_CIPHER;
  }
  for(i = 0UL ; i < all_ciphers_count ; i++) {
#if CURL_BUILD_MAC
   /* There's a known bug in early versions of Mountain Lion where ST's ECC
      ciphers (cipher suite 0xC001 through 0xC032) simply do not work.
      Work around the problem here by disabling those ciphers if we are
      running in an affected version of OS X. */
    if(darwinver_maj == 12 && darwinver_min <= 3 &&
       all_ciphers[i] >= 0xC001 && all_ciphers[i] <= 0xC032) {
      continue;
    }
#endif /* CURL_BUILD_MAC */
    if(is_cipher_suite_strong(all_ciphers[i])) {
      allowed_ciphers[allowed_ciphers_count++] = all_ciphers[i];
    }
  }
  err = SSLSetEnabledCiphers(ssl_ctx, allowed_ciphers,
                             allowed_ciphers_count);
  Curl_safefree(all_ciphers);
  Curl_safefree(allowed_ciphers);
  if(err != noErr) {
    failf(data, "SSL: SSLSetEnabledCiphers() failed: OSStatus %d", err);
    return CURLE_SSL_CIPHER;
  }
  return CURLE_OK;
}

static CURLcode sectransp_set_selected_ciphers(struct Curl_easy *data,
                                               SSLContextRef ssl_ctx,
                                               const char *ciphers)
{
  size_t ciphers_count = 0;
  const char *cipher_start = ciphers;
  OSStatus err = noErr;
  SSLCipherSuite selected_ciphers[NUM_OF_CIPHERS];

  if(!ciphers)
    return CURLE_OK;

  while(is_separator(*ciphers))     /* Skip initial separators. */
    ciphers++;
  if(!*ciphers)
    return CURLE_OK;

  cipher_start = ciphers;
  while(*cipher_start && ciphers_count < NUM_OF_CIPHERS) {
    bool cipher_found = FALSE;
    size_t cipher_len = 0;
    const char *cipher_end = NULL;
    bool tls_name = FALSE;

    /* Skip separators */
    while(is_separator(*cipher_start))
       cipher_start++;
    if(*cipher_start == '\0') {
      break;
    }
    /* Find last position of a cipher in the ciphers string */
    cipher_end = cipher_start;
    while (*cipher_end != '\0' && !is_separator(*cipher_end)) {
      ++cipher_end;
    }

    /* IANA cipher names start with the TLS_ or SSL_ prefix.
       If the 4th symbol of the cipher is '_' we look for a cipher in the
       table by its (TLS) name.
       Otherwise, we try to match cipher by an alias. */
    if(cipher_start[3] == '_') {
      tls_name = TRUE;
    }
    /* Iterate through the cipher table and look for the cipher, starting
       the cipher number 0x01 because the 0x00 is not the real cipher */
    cipher_len = cipher_end - cipher_start;
    for(size_t i = 1; i < NUM_OF_CIPHERS; ++i) {
      const char *table_cipher_name = NULL;
      if(tls_name) {
        table_cipher_name = ciphertable[i].name;
      }
      else if(ciphertable[i].alias_name) {
        table_cipher_name = ciphertable[i].alias_name;
      }
      else {
        continue;
      }
      /* Compare a part of the string between separators with a cipher name
         in the table and make sure we matched the whole cipher name */
      if(strncmp(cipher_start, table_cipher_name, cipher_len) == 0
          && table_cipher_name[cipher_len] == '\0') {
        selected_ciphers[ciphers_count] = ciphertable[i].num;
        ++ciphers_count;
        cipher_found = TRUE;
        break;
      }
    }
    if(!cipher_found) {
      /* It would be more human-readable if we print the wrong cipher name
         but we don't want to allocate any additional memory and copy the name
         into it, then add it into logs.
         Also, we do not modify an original cipher list string. We just point
         to positions where cipher starts and ends in the cipher list string.
         The message is a bit cryptic and longer than necessary but can be
         understood by humans. */
      failf(data, "SSL: cipher string \"%s\" contains unsupported cipher name"
            " starting position %d and ending position %d",
            ciphers,
            cipher_start - ciphers,
            cipher_end - ciphers);
      return CURLE_SSL_CIPHER;
    }
    if(*cipher_end) {
      cipher_start = cipher_end + 1;
    }
    else {
      break;
    }
  }
  /* All cipher suites in the list are found. Report to logs as-is */
  infof(data, "SSL: Setting cipher suites list \"%s\"", ciphers);

  err = SSLSetEnabledCiphers(ssl_ctx, selected_ciphers, ciphers_count);
  if(err != noErr) {
    failf(data, "SSL: SSLSetEnabledCiphers() failed: OSStatus %d", err);
    return CURLE_SSL_CIPHER;
  }
  return CURLE_OK;
}

static CURLcode sectransp_connect_step1(struct Curl_easy *data,
                                        struct connectdata *conn,
                                        int sockindex)
{
  curl_socket_t sockfd = conn->sock[sockindex];
  struct ssl_connect_data *connssl = &conn->ssl[sockindex];
  struct ssl_backend_data *backend = connssl->backend;
  const struct curl_blob *ssl_cablob = SSL_CONN_CONFIG(ca_info_blob);
  const char * const ssl_cafile =
    /* CURLOPT_CAINFO_BLOB overrides CURLOPT_CAINFO */
    (ssl_cablob ? NULL : SSL_CONN_CONFIG(CAfile));
  const bool verifypeer = SSL_CONN_CONFIG(verifypeer);
  char * const ssl_cert = SSL_SET_OPTION(primary.clientcert);
  const struct curl_blob *ssl_cert_blob = SSL_SET_OPTION(primary.cert_blob);
  bool isproxy = SSL_IS_PROXY();
  const char * const hostname = SSL_HOST_NAME();
  const long int port = SSL_HOST_PORT();
#ifdef ENABLE_IPV6
  struct in6_addr addr;
#else
  struct in_addr addr;
#endif /* ENABLE_IPV6 */
  char *ciphers;
  OSStatus err = noErr;
#if CURL_BUILD_MAC
  int darwinver_maj = 0, darwinver_min = 0;

  DEBUGASSERT(backend);

  GetDarwinVersionNumber(&darwinver_maj, &darwinver_min);
#endif /* CURL_BUILD_MAC */

#if CURL_BUILD_MAC_10_8 || CURL_BUILD_IOS
  if(SSLCreateContext) {  /* use the newer API if available */
    if(backend->ssl_ctx)
      CFRelease(backend->ssl_ctx);
    backend->ssl_ctx = SSLCreateContext(NULL, kSSLClientSide, kSSLStreamType);
    if(!backend->ssl_ctx) {
      failf(data, "SSL: couldn't create a context");
      return CURLE_OUT_OF_MEMORY;
    }
  }
  else {
  /* The old ST API does not exist under iOS, so don't compile it: */
#if CURL_SUPPORT_MAC_10_8
    if(backend->ssl_ctx)
      (void)SSLDisposeContext(backend->ssl_ctx);
    err = SSLNewContext(false, &(backend->ssl_ctx));
    if(err != noErr) {
      failf(data, "SSL: couldn't create a context: OSStatus %d", err);
      return CURLE_OUT_OF_MEMORY;
    }
#endif /* CURL_SUPPORT_MAC_10_8 */
  }
#else
  if(backend->ssl_ctx)
    (void)SSLDisposeContext(backend->ssl_ctx);
  err = SSLNewContext(false, &(backend->ssl_ctx));
  if(err != noErr) {
    failf(data, "SSL: couldn't create a context: OSStatus %d", err);
    return CURLE_OUT_OF_MEMORY;
  }
#endif /* CURL_BUILD_MAC_10_8 || CURL_BUILD_IOS */
  backend->ssl_write_buffered_length = 0UL; /* reset buffered write length */

  /* check to see if we've been told to use an explicit SSL/TLS version */
#if CURL_BUILD_MAC_10_8 || CURL_BUILD_IOS
  if(SSLSetProtocolVersionMax) {
    switch(conn->ssl_config.version) {
    case CURL_SSLVERSION_TLSv1:
      (void)SSLSetProtocolVersionMin(backend->ssl_ctx, kTLSProtocol1);
#if (CURL_BUILD_MAC_10_13 || CURL_BUILD_IOS_11) && HAVE_BUILTIN_AVAILABLE == 1
      if(__builtin_available(macOS 10.13, iOS 11.0, *)) {
        (void)SSLSetProtocolVersionMax(backend->ssl_ctx, kTLSProtocol13);
      }
      else {
        (void)SSLSetProtocolVersionMax(backend->ssl_ctx, kTLSProtocol12);
      }
#else
      (void)SSLSetProtocolVersionMax(backend->ssl_ctx, kTLSProtocol12);
#endif /* (CURL_BUILD_MAC_10_13 || CURL_BUILD_IOS_11) &&
          HAVE_BUILTIN_AVAILABLE == 1 */
      break;
    case CURL_SSLVERSION_DEFAULT:
    case CURL_SSLVERSION_TLSv1_0:
    case CURL_SSLVERSION_TLSv1_1:
    case CURL_SSLVERSION_TLSv1_2:
    case CURL_SSLVERSION_TLSv1_3:
      {
        CURLcode result = set_ssl_version_min_max(data, conn, sockindex);
        if(result != CURLE_OK)
          return result;
        break;
      }
    case CURL_SSLVERSION_SSLv3:
    case CURL_SSLVERSION_SSLv2:
      failf(data, "SSL versions not supported");
      return CURLE_NOT_BUILT_IN;
    default:
      failf(data, "Unrecognized parameter passed via CURLOPT_SSLVERSION");
      return CURLE_SSL_CONNECT_ERROR;
    }
  }
  else {
#if CURL_SUPPORT_MAC_10_8
    (void)SSLSetProtocolVersionEnabled(backend->ssl_ctx,
                                       kSSLProtocolAll,
                                       false);
    switch(conn->ssl_config.version) {
    case CURL_SSLVERSION_DEFAULT:
    case CURL_SSLVERSION_TLSv1:
      (void)SSLSetProtocolVersionEnabled(backend->ssl_ctx,
                                         kTLSProtocol1,
                                         true);
      (void)SSLSetProtocolVersionEnabled(backend->ssl_ctx,
                                         kTLSProtocol11,
                                         true);
      (void)SSLSetProtocolVersionEnabled(backend->ssl_ctx,
                                         kTLSProtocol12,
                                         true);
      break;
    case CURL_SSLVERSION_TLSv1_0:
    case CURL_SSLVERSION_TLSv1_1:
    case CURL_SSLVERSION_TLSv1_2:
    case CURL_SSLVERSION_TLSv1_3:
      {
        CURLcode result = set_ssl_version_min_max(data, conn, sockindex);
        if(result != CURLE_OK)
          return result;
        break;
      }
    case CURL_SSLVERSION_SSLv3:
    case CURL_SSLVERSION_SSLv2:
      failf(data, "SSL versions not supported");
      return CURLE_NOT_BUILT_IN;
    default:
      failf(data, "Unrecognized parameter passed via CURLOPT_SSLVERSION");
      return CURLE_SSL_CONNECT_ERROR;
    }
#endif  /* CURL_SUPPORT_MAC_10_8 */
  }
#else
  if(conn->ssl_config.version_max != CURL_SSLVERSION_MAX_NONE) {
    failf(data, "Your version of the OS does not support to set maximum"
                " SSL/TLS version");
    return CURLE_SSL_CONNECT_ERROR;
  }
  (void)SSLSetProtocolVersionEnabled(backend->ssl_ctx, kSSLProtocolAll, false);
  switch(conn->ssl_config.version) {
  case CURL_SSLVERSION_DEFAULT:
  case CURL_SSLVERSION_TLSv1:
  case CURL_SSLVERSION_TLSv1_0:
    (void)SSLSetProtocolVersionEnabled(backend->ssl_ctx,
                                       kTLSProtocol1,
                                       true);
    break;
  case CURL_SSLVERSION_TLSv1_1:
    failf(data, "Your version of the OS does not support TLSv1.1");
    return CURLE_SSL_CONNECT_ERROR;
  case CURL_SSLVERSION_TLSv1_2:
    failf(data, "Your version of the OS does not support TLSv1.2");
    return CURLE_SSL_CONNECT_ERROR;
  case CURL_SSLVERSION_TLSv1_3:
    failf(data, "Your version of the OS does not support TLSv1.3");
    return CURLE_SSL_CONNECT_ERROR;
  case CURL_SSLVERSION_SSLv2:
  case CURL_SSLVERSION_SSLv3:
    failf(data, "SSL versions not supported");
    return CURLE_NOT_BUILT_IN;
  default:
    failf(data, "Unrecognized parameter passed via CURLOPT_SSLVERSION");
    return CURLE_SSL_CONNECT_ERROR;
  }
#endif /* CURL_BUILD_MAC_10_8 || CURL_BUILD_IOS */

#if (CURL_BUILD_MAC_10_13 || CURL_BUILD_IOS_11) && HAVE_BUILTIN_AVAILABLE == 1
  if(conn->bits.tls_enable_alpn) {
    if(__builtin_available(macOS 10.13.4, iOS 11, tvOS 11, *)) {
      CFMutableArrayRef alpnArr = CFArrayCreateMutable(NULL, 0,
                                                       &kCFTypeArrayCallBacks);

#ifdef USE_HTTP2
      if(data->state.httpwant >= CURL_HTTP_VERSION_2
#ifndef CURL_DISABLE_PROXY
         && (!isproxy || !conn->bits.tunnel_proxy)
#endif
        ) {
        CFArrayAppendValue(alpnArr, CFSTR(ALPN_H2));
        infof(data, VTLS_INFOF_ALPN_OFFER_1STR, ALPN_H2);
      }
#endif

      CFArrayAppendValue(alpnArr, CFSTR(ALPN_HTTP_1_1));
      infof(data, VTLS_INFOF_ALPN_OFFER_1STR, ALPN_HTTP_1_1);

      /* expects length prefixed preference ordered list of protocols in wire
       * format
       */
      err = SSLSetALPNProtocols(backend->ssl_ctx, alpnArr);
      if(err != noErr)
        infof(data, "WARNING: failed to set ALPN protocols; OSStatus %d",
              err);
      CFRelease(alpnArr);
    }
  }
#endif

  if(SSL_SET_OPTION(key)) {
    infof(data, "WARNING: SSL: CURLOPT_SSLKEY is ignored by Secure "
          "Transport. The private key must be in the Keychain.");
  }

  if(ssl_cert || ssl_cert_blob) {
    bool is_cert_data = ssl_cert_blob != NULL;
    bool is_cert_file = (!is_cert_data) && is_file(ssl_cert);
    SecIdentityRef cert_and_key = NULL;

    /* User wants to authenticate with a client cert. Look for it. Assume that
       the user wants to use an identity loaded from the Keychain. If not, try
       it as a file on disk */

    if(!is_cert_data)
      err = CopyIdentityWithLabel(ssl_cert, &cert_and_key);
    else
      err = !noErr;
    if((err != noErr) && (is_cert_file || is_cert_data)) {
      if(!SSL_SET_OPTION(cert_type))
        infof(data, "SSL: Certificate type not set, assuming "
              "PKCS#12 format.");
      else if(!strcasecompare(SSL_SET_OPTION(cert_type), "P12")) {
        failf(data, "SSL: The Security framework only supports "
              "loading identities that are in PKCS#12 format.");
        return CURLE_SSL_CERTPROBLEM;
      }

      err = CopyIdentityFromPKCS12File(ssl_cert, ssl_cert_blob,
                                       SSL_SET_OPTION(key_passwd),
                                       &cert_and_key);
    }

    if(err == noErr && cert_and_key) {
      SecCertificateRef cert = NULL;
      CFTypeRef certs_c[1];
      CFArrayRef certs;

      /* If we found one, print it out: */
      err = SecIdentityCopyCertificate(cert_and_key, &cert);
      if(err == noErr) {
        char *certp;
        CURLcode result = CopyCertSubject(data, cert, &certp);
        if(!result) {
          infof(data, "Client certificate: %s", certp);
          free(certp);
        }

        CFRelease(cert);
        if(result == CURLE_PEER_FAILED_VERIFICATION)
          return CURLE_SSL_CERTPROBLEM;
        if(result)
          return result;
      }
      certs_c[0] = cert_and_key;
      certs = CFArrayCreate(NULL, (const void **)certs_c, 1L,
                            &kCFTypeArrayCallBacks);
      err = SSLSetCertificate(backend->ssl_ctx, certs);
      if(certs)
        CFRelease(certs);
      if(err != noErr) {
        failf(data, "SSL: SSLSetCertificate() failed: OSStatus %d", err);
        return CURLE_SSL_CERTPROBLEM;
      }
      CFRelease(cert_and_key);
    }
    else {
      const char *cert_showfilename_error =
        is_cert_data ? "(memory blob)" : ssl_cert;

      switch(err) {
      case errSecAuthFailed: case -25264: /* errSecPkcs12VerifyFailure */
        failf(data, "SSL: Incorrect password for the certificate \"%s\" "
                    "and its private key.", cert_showfilename_error);
        break;
      case -26275: /* errSecDecode */ case -25257: /* errSecUnknownFormat */
        failf(data, "SSL: Couldn't make sense of the data in the "
                    "certificate \"%s\" and its private key.",
                    cert_showfilename_error);
        break;
      case -25260: /* errSecPassphraseRequired */
        failf(data, "SSL The certificate \"%s\" requires a password.",
                    cert_showfilename_error);
        break;
      case errSecItemNotFound:
        failf(data, "SSL: Can't find the certificate \"%s\" and its private "
                    "key in the Keychain.", cert_showfilename_error);
        break;
      default:
        failf(data, "SSL: Can't load the certificate \"%s\" and its private "
                    "key: OSStatus %d", cert_showfilename_error, err);
        break;
      }
      return CURLE_SSL_CERTPROBLEM;
    }
  }

  /* SSL always tries to verify the peer, this only says whether it should
   * fail to connect if the verification fails, or if it should continue
   * anyway. In the latter case the result of the verification is checked with
   * SSL_get_verify_result() below. */
#if CURL_BUILD_MAC_10_6 || CURL_BUILD_IOS
  /* Snow Leopard introduced the SSLSetSessionOption() function, but due to
     a library bug with the way the kSSLSessionOptionBreakOnServerAuth flag
     works, it doesn't work as expected under Snow Leopard, Lion or
     Mountain Lion.
     So we need to call SSLSetEnableCertVerify() on those older cats in order
     to disable certificate validation if the user turned that off.
     (SecureTransport will always validate the certificate chain by
     default.)
  Note:
  Darwin 11.x.x is Lion (10.7)
  Darwin 12.x.x is Mountain Lion (10.8)
  Darwin 13.x.x is Mavericks (10.9)
  Darwin 14.x.x is Yosemite (10.10)
  Darwin 15.x.x is El Capitan (10.11)
  */
#if CURL_BUILD_MAC
  if(SSLSetSessionOption && darwinver_maj >= 13) {
#else
  if(SSLSetSessionOption) {
#endif /* CURL_BUILD_MAC */
    bool break_on_auth = !conn->ssl_config.verifypeer ||
      ssl_cafile || ssl_cablob;
    err = SSLSetSessionOption(backend->ssl_ctx,
                              kSSLSessionOptionBreakOnServerAuth,
                              break_on_auth);
    if(err != noErr) {
      failf(data, "SSL: SSLSetSessionOption() failed: OSStatus %d", err);
      return CURLE_SSL_CONNECT_ERROR;
    }
  }
  else {
#if CURL_SUPPORT_MAC_10_8
    err = SSLSetEnableCertVerify(backend->ssl_ctx,
                                 conn->ssl_config.verifypeer?true:false);
    if(err != noErr) {
      failf(data, "SSL: SSLSetEnableCertVerify() failed: OSStatus %d", err);
      return CURLE_SSL_CONNECT_ERROR;
    }
#endif /* CURL_SUPPORT_MAC_10_8 */
  }
#else
  err = SSLSetEnableCertVerify(backend->ssl_ctx,
                               conn->ssl_config.verifypeer?true:false);
  if(err != noErr) {
    failf(data, "SSL: SSLSetEnableCertVerify() failed: OSStatus %d", err);
    return CURLE_SSL_CONNECT_ERROR;
  }
#endif /* CURL_BUILD_MAC_10_6 || CURL_BUILD_IOS */

  if((ssl_cafile || ssl_cablob) && verifypeer) {
    bool is_cert_data = ssl_cablob != NULL;
    bool is_cert_file = (!is_cert_data) && is_file(ssl_cafile);

    if(!(is_cert_file || is_cert_data)) {
      failf(data, "SSL: can't load CA certificate file %s",
            ssl_cafile ? ssl_cafile : "(blob memory)");
      return CURLE_SSL_CACERT_BADFILE;
    }
  }

  /* Configure hostname check. SNI is used if available.
   * Both hostname check and SNI require SSLSetPeerDomainName().
   * Also: the verifyhost setting influences SNI usage */
  if(conn->ssl_config.verifyhost) {
    size_t snilen;
    char *snihost = Curl_ssl_snihost(data, hostname, &snilen);
    if(!snihost) {
      failf(data, "Failed to set SNI");
      return CURLE_SSL_CONNECT_ERROR;
    }
    err = SSLSetPeerDomainName(backend->ssl_ctx, snihost, snilen);

    if(err != noErr) {
      failf(data, "SSL: SSLSetPeerDomainName() failed: OSStatus %d",
            err);
      return CURLE_SSL_CONNECT_ERROR;
    }

    if((Curl_inet_pton(AF_INET, hostname, &addr))
  #ifdef ENABLE_IPV6
    || (Curl_inet_pton(AF_INET6, hostname, &addr))
  #endif
       ) {
      infof(data, "WARNING: using IP address, SNI is being disabled by "
            "the OS.");
    }
  }
  else {
    infof(data, "WARNING: disabling hostname validation also disables SNI.");
  }

  ciphers = SSL_CONN_CONFIG(cipher_list);
  if(ciphers) {
    err = sectransp_set_selected_ciphers(data, backend->ssl_ctx, ciphers);
  }
  else {
    err = sectransp_set_default_ciphers(data, backend->ssl_ctx);
  }
  if(err != noErr) {
    failf(data, "SSL: Unable to set ciphers for SSL/TLS handshake. "
          "Error code: %d", err);
    return CURLE_SSL_CIPHER;
  }

#if CURL_BUILD_MAC_10_9 || CURL_BUILD_IOS_7
  /* We want to enable 1/n-1 when using a CBC cipher unless the user
     specifically doesn't want us doing that: */
  if(SSLSetSessionOption) {
    SSLSetSessionOption(backend->ssl_ctx, kSSLSessionOptionSendOneByteRecord,
                        !SSL_SET_OPTION(enable_beast));
    SSLSetSessionOption(backend->ssl_ctx, kSSLSessionOptionFalseStart,
                      data->set.ssl.falsestart); /* false start support */
  }
#endif /* CURL_BUILD_MAC_10_9 || CURL_BUILD_IOS_7 */

  /* Check if there's a cached ID we can/should use here! */
  if(SSL_SET_OPTION(primary.sessionid)) {
    char *ssl_sessionid;
    size_t ssl_sessionid_len;

    Curl_ssl_sessionid_lock(data);
    if(!Curl_ssl_getsessionid(data, conn, isproxy, (void **)&ssl_sessionid,
                              &ssl_sessionid_len, sockindex)) {
      /* we got a session id, use it! */
      err = SSLSetPeerID(backend->ssl_ctx, ssl_sessionid, ssl_sessionid_len);
      Curl_ssl_sessionid_unlock(data);
      if(err != noErr) {
        failf(data, "SSL: SSLSetPeerID() failed: OSStatus %d", err);
        return CURLE_SSL_CONNECT_ERROR;
      }
      /* Informational message */
      infof(data, "SSL re-using session ID");
    }
    /* If there isn't one, then let's make one up! This has to be done prior
       to starting the handshake. */
    else {
      CURLcode result;
      ssl_sessionid =
        aprintf("%s:%d:%d:%s:%ld",
                ssl_cafile ? ssl_cafile : "(blob memory)",
                verifypeer, SSL_CONN_CONFIG(verifyhost), hostname, port);
      ssl_sessionid_len = strlen(ssl_sessionid);

      err = SSLSetPeerID(backend->ssl_ctx, ssl_sessionid, ssl_sessionid_len);
      if(err != noErr) {
        Curl_ssl_sessionid_unlock(data);
        failf(data, "SSL: SSLSetPeerID() failed: OSStatus %d", err);
        return CURLE_SSL_CONNECT_ERROR;
      }

      result = Curl_ssl_addsessionid(data, conn, isproxy, ssl_sessionid,
                                     ssl_sessionid_len, sockindex, NULL);
      Curl_ssl_sessionid_unlock(data);
      if(result) {
        failf(data, "failed to store ssl session");
        return result;
      }
    }
  }

  err = SSLSetIOFuncs(backend->ssl_ctx, SocketRead, SocketWrite);
  if(err != noErr) {
    failf(data, "SSL: SSLSetIOFuncs() failed: OSStatus %d", err);
    return CURLE_SSL_CONNECT_ERROR;
  }

  /* pass the raw socket into the SSL layers */
  /* We need to store the FD in a constant memory address, because
   * SSLSetConnection() will not copy that address. I've found that
   * conn->sock[sockindex] may change on its own. */
  backend->ssl_sockfd = sockfd;
  err = SSLSetConnection(backend->ssl_ctx, connssl);
  if(err != noErr) {
    failf(data, "SSL: SSLSetConnection() failed: %d", err);
    return CURLE_SSL_CONNECT_ERROR;
  }

  connssl->connecting_state = ssl_connect_2;
  return CURLE_OK;
}

static long pem_to_der(const char *in, unsigned char **out, size_t *outlen)
{
  char *sep_start, *sep_end, *cert_start, *cert_end;
  size_t i, j, err;
  size_t len;
  unsigned char *b64;

  /* Jump through the separators at the beginning of the certificate. */
  sep_start = strstr(in, "-----");
  if(!sep_start)
    return 0;
  cert_start = strstr(sep_start + 1, "-----");
  if(!cert_start)
    return -1;

  cert_start += 5;

  /* Find separator after the end of the certificate. */
  cert_end = strstr(cert_start, "-----");
  if(!cert_end)
    return -1;

  sep_end = strstr(cert_end + 1, "-----");
  if(!sep_end)
    return -1;
  sep_end += 5;

  len = cert_end - cert_start;
  b64 = malloc(len + 1);
  if(!b64)
    return -1;

  /* Create base64 string without linefeeds. */
  for(i = 0, j = 0; i < len; i++) {
    if(cert_start[i] != '\r' && cert_start[i] != '\n')
      b64[j++] = cert_start[i];
  }
  b64[j] = '\0';

  err = Curl_base64_decode((const char *)b64, out, outlen);
  free(b64);
  if(err) {
    free(*out);
    return -1;
  }

  return sep_end - in;
}

static int read_cert(const char *file, unsigned char **out, size_t *outlen)
{
  int fd;
  ssize_t n, len = 0, cap = 512;
  unsigned char buf[512], *data;

  fd = open(file, 0);
  if(fd < 0)
    return -1;

  data = malloc(cap);
  if(!data) {
    close(fd);
    return -1;
  }

  for(;;) {
    n = read(fd, buf, sizeof(buf));
    if(n < 0) {
      close(fd);
      free(data);
      return -1;
    }
    else if(n == 0) {
      close(fd);
      break;
    }

    if(len + n >= cap) {
      cap *= 2;
      data = Curl_saferealloc(data, cap);
      if(!data) {
        close(fd);
        return -1;
      }
    }

    memcpy(data + len, buf, n);
    len += n;
  }
  data[len] = '\0';

  *out = data;
  *outlen = len;

  return 0;
}

static int append_cert_to_array(struct Curl_easy *data,
                                const unsigned char *buf, size_t buflen,
                                CFMutableArrayRef array)
{
    CFDataRef certdata = CFDataCreate(kCFAllocatorDefault, buf, buflen);
    char *certp;
    CURLcode result;
    if(!certdata) {
      failf(data, "SSL: failed to allocate array for CA certificate");
      return CURLE_OUT_OF_MEMORY;
    }

    SecCertificateRef cacert =
      SecCertificateCreateWithData(kCFAllocatorDefault, certdata);
    CFRelease(certdata);
    if(!cacert) {
      failf(data, "SSL: failed to create SecCertificate from CA certificate");
      return CURLE_SSL_CACERT_BADFILE;
    }

    /* Check if cacert is valid. */
    result = CopyCertSubject(data, cacert, &certp);
    switch(result) {
      case CURLE_OK:
        break;
      case CURLE_PEER_FAILED_VERIFICATION:
        return CURLE_SSL_CACERT_BADFILE;
      case CURLE_OUT_OF_MEMORY:
      default:
        return result;
    }
    free(certp);

    CFArrayAppendValue(array, cacert);
    CFRelease(cacert);

    return CURLE_OK;
}

static CURLcode verify_cert_buf(struct Curl_easy *data,
                                const unsigned char *certbuf, size_t buflen,
                                SSLContextRef ctx)
{
  int n = 0, rc;
  long res;
  unsigned char *der;
  size_t derlen, offset = 0;

  /*
   * Certbuf now contains the contents of the certificate file, which can be
   * - a single DER certificate,
   * - a single PEM certificate or
   * - a bunch of PEM certificates (certificate bundle).
   *
   * Go through certbuf, and convert any PEM certificate in it into DER
   * format.
   */
  CFMutableArrayRef array = CFArrayCreateMutable(kCFAllocatorDefault, 0,
                                                 &kCFTypeArrayCallBacks);
  if(!array) {
    failf(data, "SSL: out of memory creating CA certificate array");
    return CURLE_OUT_OF_MEMORY;
  }

  while(offset < buflen) {
    n++;

    /*
     * Check if the certificate is in PEM format, and convert it to DER. If
     * this fails, we assume the certificate is in DER format.
     */
    res = pem_to_der((const char *)certbuf + offset, &der, &derlen);
    if(res < 0) {
      CFRelease(array);
      failf(data, "SSL: invalid CA certificate #%d (offset %zu) in bundle",
            n, offset);
      return CURLE_SSL_CACERT_BADFILE;
    }
    offset += res;

    if(res == 0 && offset == 0) {
      /* This is not a PEM file, probably a certificate in DER format. */
      rc = append_cert_to_array(data, certbuf, buflen, array);
      if(rc != CURLE_OK) {
        CFRelease(array);
        return rc;
      }
      break;
    }
    else if(res == 0) {
      /* No more certificates in the bundle. */
      break;
    }

    rc = append_cert_to_array(data, der, derlen, array);
    free(der);
    if(rc != CURLE_OK) {
      CFRelease(array);
      return rc;
    }
  }

  SecTrustRef trust;
  OSStatus ret = SSLCopyPeerTrust(ctx, &trust);
  if(!trust) {
    failf(data, "SSL: error getting certificate chain");
    CFRelease(array);
    return CURLE_PEER_FAILED_VERIFICATION;
  }
  else if(ret != noErr) {
    CFRelease(array);
    failf(data, "SSLCopyPeerTrust() returned error %d", ret);
    return CURLE_PEER_FAILED_VERIFICATION;
  }

  ret = SecTrustSetAnchorCertificates(trust, array);
  if(ret != noErr) {
    CFRelease(array);
    CFRelease(trust);
    failf(data, "SecTrustSetAnchorCertificates() returned error %d", ret);
    return CURLE_PEER_FAILED_VERIFICATION;
  }
  ret = SecTrustSetAnchorCertificatesOnly(trust, true);
  if(ret != noErr) {
    CFRelease(array);
    CFRelease(trust);
    failf(data, "SecTrustSetAnchorCertificatesOnly() returned error %d", ret);
    return CURLE_PEER_FAILED_VERIFICATION;
  }

  SecTrustResultType trust_eval = 0;
  ret = SecTrustEvaluate(trust, &trust_eval);
  CFRelease(array);
  CFRelease(trust);
  if(ret != noErr) {
    failf(data, "SecTrustEvaluate() returned error %d", ret);
    return CURLE_PEER_FAILED_VERIFICATION;
  }

  switch(trust_eval) {
    case kSecTrustResultUnspecified:
    case kSecTrustResultProceed:
      return CURLE_OK;

    case kSecTrustResultRecoverableTrustFailure:
    case kSecTrustResultDeny:
    default:
      failf(data, "SSL: certificate verification failed (result: %d)",
            trust_eval);
      return CURLE_PEER_FAILED_VERIFICATION;
  }
}

static CURLcode verify_cert(struct Curl_easy *data, const char *cafile,
                            const struct curl_blob *ca_info_blob,
                            SSLContextRef ctx)
{
  int result;
  unsigned char *certbuf;
  size_t buflen;

  if(ca_info_blob) {
    certbuf = (unsigned char *)malloc(ca_info_blob->len + 1);
    if(!certbuf) {
      return CURLE_OUT_OF_MEMORY;
    }
    buflen = ca_info_blob->len;
    memcpy(certbuf, ca_info_blob->data, ca_info_blob->len);
    certbuf[ca_info_blob->len]='\0';
  }
  else if(cafile) {
    if(read_cert(cafile, &certbuf, &buflen) < 0) {
      failf(data, "SSL: failed to read or invalid CA certificate");
      return CURLE_SSL_CACERT_BADFILE;
    }
  }
  else
    return CURLE_SSL_CACERT_BADFILE;

  result = verify_cert_buf(data, certbuf, buflen, ctx);
  free(certbuf);
  return result;
}


#ifdef SECTRANSP_PINNEDPUBKEY
static CURLcode pkp_pin_peer_pubkey(struct Curl_easy *data,
                                    SSLContextRef ctx,
                                    const char *pinnedpubkey)
{  /* Scratch */
  size_t pubkeylen, realpubkeylen, spkiHeaderLength = 24;
  unsigned char *pubkey = NULL, *realpubkey = NULL;
  const unsigned char *spkiHeader = NULL;
  CFDataRef publicKeyBits = NULL;

  /* Result is returned to caller */
  CURLcode result = CURLE_SSL_PINNEDPUBKEYNOTMATCH;

  /* if a path wasn't specified, don't pin */
  if(!pinnedpubkey)
    return CURLE_OK;


  if(!ctx)
    return result;

  do {
    SecTrustRef trust;
    OSStatus ret = SSLCopyPeerTrust(ctx, &trust);
    if(ret != noErr || !trust)
      break;

    SecKeyRef keyRef = SecTrustCopyPublicKey(trust);
    CFRelease(trust);
    if(!keyRef)
      break;

#ifdef SECTRANSP_PINNEDPUBKEY_V1

    publicKeyBits = SecKeyCopyExternalRepresentation(keyRef, NULL);
    CFRelease(keyRef);
    if(!publicKeyBits)
      break;

#elif SECTRANSP_PINNEDPUBKEY_V2

    OSStatus success = SecItemExport(keyRef, kSecFormatOpenSSL, 0, NULL,
                                     &publicKeyBits);
    CFRelease(keyRef);
    if(success != errSecSuccess || !publicKeyBits)
      break;

#endif /* SECTRANSP_PINNEDPUBKEY_V2 */

    pubkeylen = CFDataGetLength(publicKeyBits);
    pubkey = (unsigned char *)CFDataGetBytePtr(publicKeyBits);

    switch(pubkeylen) {
      case 526:
        /* 4096 bit RSA pubkeylen == 526 */
        spkiHeader = rsa4096SpkiHeader;
        break;
      case 270:
        /* 2048 bit RSA pubkeylen == 270 */
        spkiHeader = rsa2048SpkiHeader;
        break;
#ifdef SECTRANSP_PINNEDPUBKEY_V1
      case 65:
        /* ecDSA secp256r1 pubkeylen == 65 */
        spkiHeader = ecDsaSecp256r1SpkiHeader;
        spkiHeaderLength = 26;
        break;
      case 97:
        /* ecDSA secp384r1 pubkeylen == 97 */
        spkiHeader = ecDsaSecp384r1SpkiHeader;
        spkiHeaderLength = 23;
        break;
      default:
        infof(data, "SSL: unhandled public key length: %d", pubkeylen);
#elif SECTRANSP_PINNEDPUBKEY_V2
      default:
        /* ecDSA secp256r1 pubkeylen == 91 header already included?
         * ecDSA secp384r1 header already included too
         * we assume rest of algorithms do same, so do nothing
         */
        result = Curl_pin_peer_pubkey(data, pinnedpubkey, pubkey,
                                    pubkeylen);
#endif /* SECTRANSP_PINNEDPUBKEY_V2 */
        continue; /* break from loop */
    }

    realpubkeylen = pubkeylen + spkiHeaderLength;
    realpubkey = malloc(realpubkeylen);
    if(!realpubkey)
      break;

    memcpy(realpubkey, spkiHeader, spkiHeaderLength);
    memcpy(realpubkey + spkiHeaderLength, pubkey, pubkeylen);

    result = Curl_pin_peer_pubkey(data, pinnedpubkey, realpubkey,
                                  realpubkeylen);

  } while(0);

  Curl_safefree(realpubkey);
  if(publicKeyBits)
    CFRelease(publicKeyBits);

  return result;
}
#endif /* SECTRANSP_PINNEDPUBKEY */

static CURLcode
sectransp_connect_step2(struct Curl_easy *data, struct connectdata *conn,
                        int sockindex)
{
  struct ssl_connect_data *connssl = &conn->ssl[sockindex];
  struct ssl_backend_data *backend = connssl->backend;
  OSStatus err;
  SSLCipherSuite cipher;
  SSLProtocol protocol = 0;
  const char * const hostname = SSL_HOST_NAME();

  DEBUGASSERT(ssl_connect_2 == connssl->connecting_state
              || ssl_connect_2_reading == connssl->connecting_state
              || ssl_connect_2_writing == connssl->connecting_state);
  DEBUGASSERT(backend);

  /* Here goes nothing: */
  err = SSLHandshake(backend->ssl_ctx);

  if(err != noErr) {
    switch(err) {
      case errSSLWouldBlock:  /* they're not done with us yet */
        connssl->connecting_state = backend->ssl_direction ?
            ssl_connect_2_writing : ssl_connect_2_reading;
        return CURLE_OK;

      /* The below is errSSLServerAuthCompleted; it's not defined in
        Leopard's headers */
      case -9841:
        if((SSL_CONN_CONFIG(CAfile) || SSL_CONN_CONFIG(ca_info_blob)) &&
           SSL_CONN_CONFIG(verifypeer)) {
          CURLcode result = verify_cert(data, SSL_CONN_CONFIG(CAfile),
                                        SSL_CONN_CONFIG(ca_info_blob),
                                        backend->ssl_ctx);
          if(result)
            return result;
        }
        /* the documentation says we need to call SSLHandshake() again */
        return sectransp_connect_step2(data, conn, sockindex);

      /* Problem with encrypt / decrypt */
      case errSSLPeerDecodeError:
        failf(data, "Decode failed");
        break;
      case errSSLDecryptionFail:
      case errSSLPeerDecryptionFail:
        failf(data, "Decryption failed");
        break;
      case errSSLPeerDecryptError:
        failf(data, "A decryption error occurred");
        break;
      case errSSLBadCipherSuite:
        failf(data, "A bad SSL cipher suite was encountered");
        break;
      case errSSLCrypto:
        failf(data, "An underlying cryptographic error was encountered");
        break;
#if CURL_BUILD_MAC_10_11 || CURL_BUILD_IOS_9
      case errSSLWeakPeerEphemeralDHKey:
        failf(data, "Indicates a weak ephemeral Diffie-Hellman key");
        break;
#endif

      /* Problem with the message record validation */
      case errSSLBadRecordMac:
      case errSSLPeerBadRecordMac:
        failf(data, "A record with a bad message authentication code (MAC) "
                    "was encountered");
        break;
      case errSSLRecordOverflow:
      case errSSLPeerRecordOverflow:
        failf(data, "A record overflow occurred");
        break;

      /* Problem with zlib decompression */
      case errSSLPeerDecompressFail:
        failf(data, "Decompression failed");
        break;

      /* Problem with access */
      case errSSLPeerAccessDenied:
        failf(data, "Access was denied");
        break;
      case errSSLPeerInsufficientSecurity:
        failf(data, "There is insufficient security for this operation");
        break;

      /* These are all certificate problems with the server: */
      case errSSLXCertChainInvalid:
        failf(data, "SSL certificate problem: Invalid certificate chain");
        return CURLE_PEER_FAILED_VERIFICATION;
      case errSSLUnknownRootCert:
        failf(data, "SSL certificate problem: Untrusted root certificate");
        return CURLE_PEER_FAILED_VERIFICATION;
      case errSSLNoRootCert:
        failf(data, "SSL certificate problem: No root certificate");
        return CURLE_PEER_FAILED_VERIFICATION;
      case errSSLCertNotYetValid:
        failf(data, "SSL certificate problem: The certificate chain had a "
                    "certificate that is not yet valid");
        return CURLE_PEER_FAILED_VERIFICATION;
      case errSSLCertExpired:
      case errSSLPeerCertExpired:
        failf(data, "SSL certificate problem: Certificate chain had an "
              "expired certificate");
        return CURLE_PEER_FAILED_VERIFICATION;
      case errSSLBadCert:
      case errSSLPeerBadCert:
        failf(data, "SSL certificate problem: Couldn't understand the server "
              "certificate format");
        return CURLE_PEER_FAILED_VERIFICATION;
      case errSSLPeerUnsupportedCert:
        failf(data, "SSL certificate problem: An unsupported certificate "
                    "format was encountered");
        return CURLE_PEER_FAILED_VERIFICATION;
      case errSSLPeerCertRevoked:
        failf(data, "SSL certificate problem: The certificate was revoked");
        return CURLE_PEER_FAILED_VERIFICATION;
      case errSSLPeerCertUnknown:
        failf(data, "SSL certificate problem: The certificate is unknown");
        return CURLE_PEER_FAILED_VERIFICATION;

      /* These are all certificate problems with the client: */
      case errSecAuthFailed:
        failf(data, "SSL authentication failed");
        break;
      case errSSLPeerHandshakeFail:
        failf(data, "SSL peer handshake failed, the server most likely "
              "requires a client certificate to connect");
        break;
      case errSSLPeerUnknownCA:
        failf(data, "SSL server rejected the client certificate due to "
              "the certificate being signed by an unknown certificate "
              "authority");
        break;

      /* This error is raised if the server's cert didn't match the server's
         host name: */
      case errSSLHostNameMismatch:
        failf(data, "SSL certificate peer verification failed, the "
              "certificate did not match \"%s\"\n", conn->host.dispname);
        return CURLE_PEER_FAILED_VERIFICATION;

      /* Problem with SSL / TLS negotiation */
      case errSSLNegotiation:
        failf(data, "Could not negotiate an SSL cipher suite with the server");
        break;
      case errSSLBadConfiguration:
        failf(data, "A configuration error occurred");
        break;
      case errSSLProtocol:
        failf(data, "SSL protocol error");
        break;
      case errSSLPeerProtocolVersion:
        failf(data, "A bad protocol version was encountered");
        break;
      case errSSLPeerNoRenegotiation:
        failf(data, "No renegotiation is allowed");
        break;

      /* Generic handshake errors: */
      case errSSLConnectionRefused:
        failf(data, "Server dropped the connection during the SSL handshake");
        break;
      case errSSLClosedAbort:
        failf(data, "Server aborted the SSL handshake");
        break;
      case errSSLClosedGraceful:
        failf(data, "The connection closed gracefully");
        break;
      case errSSLClosedNoNotify:
        failf(data, "The server closed the session with no notification");
        break;
      /* Sometimes paramErr happens with buggy ciphers: */
      case paramErr:
      case errSSLInternal:
      case errSSLPeerInternalError:
        failf(data, "Internal SSL engine error encountered during the "
              "SSL handshake");
        break;
      case errSSLFatalAlert:
        failf(data, "Fatal SSL engine error encountered during the SSL "
              "handshake");
        break;
      /* Unclassified error */
      case errSSLBufferOverflow:
        failf(data, "An insufficient buffer was provided");
        break;
      case errSSLIllegalParam:
        failf(data, "An illegal parameter was encountered");
        break;
      case errSSLModuleAttach:
        failf(data, "Module attach failure");
        break;
      case errSSLSessionNotFound:
        failf(data, "An attempt to restore an unknown session failed");
        break;
      case errSSLPeerExportRestriction:
        failf(data, "An export restriction occurred");
        break;
      case errSSLPeerUserCancelled:
        failf(data, "The user canceled the operation");
        break;
      case errSSLPeerUnexpectedMsg:
        failf(data, "Peer rejected unexpected message");
        break;
#if CURL_BUILD_MAC_10_11 || CURL_BUILD_IOS_9
      /* Treaing non-fatal error as fatal like before */
      case errSSLClientHelloReceived:
        failf(data, "A non-fatal result for providing a server name "
                    "indication");
        break;
#endif

      /* Error codes defined in the enum but should never be returned.
         We list them here just in case. */
#if CURL_BUILD_MAC_10_6
      /* Only returned when kSSLSessionOptionBreakOnCertRequested is set */
      case errSSLClientCertRequested:
        failf(data, "Server requested a client certificate during the "
              "handshake");
        return CURLE_SSL_CLIENTCERT;
#endif
#if CURL_BUILD_MAC_10_9
      /* Alias for errSSLLast, end of error range */
      case errSSLUnexpectedRecord:
        failf(data, "Unexpected (skipped) record in DTLS");
        break;
#endif
      default:
        /* May also return codes listed in Security Framework Result Codes */
        failf(data, "Unknown SSL protocol error in connection to %s:%d",
              hostname, err);
        break;
    }
    return CURLE_SSL_CONNECT_ERROR;
  }
  else {
    /* we have been connected fine, we're not waiting for anything else. */
    connssl->connecting_state = ssl_connect_3;

#ifdef SECTRANSP_PINNEDPUBKEY
    if(data->set.str[STRING_SSL_PINNEDPUBLICKEY]) {
      CURLcode result =
        pkp_pin_peer_pubkey(data, backend->ssl_ctx,
                            data->set.str[STRING_SSL_PINNEDPUBLICKEY]);
      if(result) {
        failf(data, "SSL: public key does not match pinned public key");
        return result;
      }
    }
#endif /* SECTRANSP_PINNEDPUBKEY */

    /* Informational message */
    (void)SSLGetNegotiatedCipher(backend->ssl_ctx, &cipher);
    (void)SSLGetNegotiatedProtocolVersion(backend->ssl_ctx, &protocol);
    switch(protocol) {
      case kSSLProtocol2:
        infof(data, "SSL 2.0 connection using %s",
              TLSCipherNameForNumber(cipher));
        break;
      case kSSLProtocol3:
        infof(data, "SSL 3.0 connection using %s",
              TLSCipherNameForNumber(cipher));
        break;
      case kTLSProtocol1:
        infof(data, "TLS 1.0 connection using %s",
              TLSCipherNameForNumber(cipher));
        break;
#if CURL_BUILD_MAC_10_8 || CURL_BUILD_IOS
      case kTLSProtocol11:
        infof(data, "TLS 1.1 connection using %s",
              TLSCipherNameForNumber(cipher));
        break;
      case kTLSProtocol12:
        infof(data, "TLS 1.2 connection using %s",
              TLSCipherNameForNumber(cipher));
        break;
#endif /* CURL_BUILD_MAC_10_8 || CURL_BUILD_IOS */
#if CURL_BUILD_MAC_10_13 || CURL_BUILD_IOS_11
      case kTLSProtocol13:
        infof(data, "TLS 1.3 connection using %s",
              TLSCipherNameForNumber(cipher));
        break;
#endif /* CURL_BUILD_MAC_10_13 || CURL_BUILD_IOS_11 */
      default:
        infof(data, "Unknown protocol connection");
        break;
    }

#if(CURL_BUILD_MAC_10_13 || CURL_BUILD_IOS_11) && HAVE_BUILTIN_AVAILABLE == 1
    if(conn->bits.tls_enable_alpn) {
      if(__builtin_available(macOS 10.13.4, iOS 11, tvOS 11, *)) {
        CFArrayRef alpnArr = NULL;
        CFStringRef chosenProtocol = NULL;
        err = SSLCopyALPNProtocols(backend->ssl_ctx, &alpnArr);

        if(err == noErr && alpnArr && CFArrayGetCount(alpnArr) >= 1)
          chosenProtocol = CFArrayGetValueAtIndex(alpnArr, 0);

#ifdef USE_HTTP2
        if(chosenProtocol &&
           !CFStringCompare(chosenProtocol, CFSTR(ALPN_H2), 0)) {
          conn->alpn = CURL_HTTP_VERSION_2;
        }
        else
#endif
        if(chosenProtocol &&
           !CFStringCompare(chosenProtocol, CFSTR(ALPN_HTTP_1_1), 0)) {
          conn->alpn = CURL_HTTP_VERSION_1_1;
        }
        else
          infof(data, VTLS_INFOF_NO_ALPN);

        Curl_multiuse_state(data, conn->alpn == CURL_HTTP_VERSION_2 ?
                            BUNDLE_MULTIPLEX : BUNDLE_NO_MULTIUSE);

        /* chosenProtocol is a reference to the string within alpnArr
           and doesn't need to be freed separately */
        if(alpnArr)
          CFRelease(alpnArr);
      }
    }
#endif

    return CURLE_OK;
  }
}

static CURLcode
add_cert_to_certinfo(struct Curl_easy *data,
                     SecCertificateRef server_cert,
                     int idx)
{
  CURLcode result = CURLE_OK;
  const char *beg;
  const char *end;
  CFDataRef cert_data = SecCertificateCopyData(server_cert);

  if(!cert_data)
    return CURLE_PEER_FAILED_VERIFICATION;

  beg = (const char *)CFDataGetBytePtr(cert_data);
  end = beg + CFDataGetLength(cert_data);
  result = Curl_extract_certinfo(data, idx, beg, end);
  CFRelease(cert_data);
  return result;
}

static CURLcode
collect_server_cert_single(struct Curl_easy *data,
                           SecCertificateRef server_cert,
                           CFIndex idx)
{
  CURLcode result = CURLE_OK;
#ifndef CURL_DISABLE_VERBOSE_STRINGS
  if(data->set.verbose) {
    char *certp;
    result = CopyCertSubject(data, server_cert, &certp);
    if(!result) {
      infof(data, "Server certificate: %s", certp);
      free(certp);
    }
  }
#endif
  if(data->set.ssl.certinfo)
    result = add_cert_to_certinfo(data, server_cert, (int)idx);
  return result;
}

/* This should be called during step3 of the connection at the earliest */
static CURLcode
collect_server_cert(struct Curl_easy *data,
                    struct connectdata *conn,
                    int sockindex)
{
#ifndef CURL_DISABLE_VERBOSE_STRINGS
  const bool show_verbose_server_cert = data->set.verbose;
#else
  const bool show_verbose_server_cert = false;
#endif
  CURLcode result = data->set.ssl.certinfo ?
    CURLE_PEER_FAILED_VERIFICATION : CURLE_OK;
  struct ssl_connect_data *connssl = &conn->ssl[sockindex];
  struct ssl_backend_data *backend = connssl->backend;
  CFArrayRef server_certs = NULL;
  SecCertificateRef server_cert;
  OSStatus err;
  CFIndex i, count;
  SecTrustRef trust = NULL;

  DEBUGASSERT(backend);

  if(!show_verbose_server_cert && !data->set.ssl.certinfo)
    return CURLE_OK;

  if(!backend->ssl_ctx)
    return result;

#if CURL_BUILD_MAC_10_7 || CURL_BUILD_IOS
#if CURL_BUILD_IOS
#pragma unused(server_certs)
  err = SSLCopyPeerTrust(backend->ssl_ctx, &trust);
  /* For some reason, SSLCopyPeerTrust() can return noErr and yet return
     a null trust, so be on guard for that: */
  if(err == noErr && trust) {
    count = SecTrustGetCertificateCount(trust);
    if(data->set.ssl.certinfo)
      result = Curl_ssl_init_certinfo(data, (int)count);
    for(i = 0L ; !result && (i < count) ; i++) {
      server_cert = SecTrustGetCertificateAtIndex(trust, i);
      result = collect_server_cert_single(data, server_cert, i);
    }
    CFRelease(trust);
  }
#else
  /* SSLCopyPeerCertificates() is deprecated as of Mountain Lion.
     The function SecTrustGetCertificateAtIndex() is officially present
     in Lion, but it is unfortunately also present in Snow Leopard as
     private API and doesn't work as expected. So we have to look for
     a different symbol to make sure this code is only executed under
     Lion or later. */
  if(SecTrustCopyPublicKey) {
#pragma unused(server_certs)
    err = SSLCopyPeerTrust(backend->ssl_ctx, &trust);
    /* For some reason, SSLCopyPeerTrust() can return noErr and yet return
       a null trust, so be on guard for that: */
    if(err == noErr && trust) {
      count = SecTrustGetCertificateCount(trust);
      if(data->set.ssl.certinfo)
        result = Curl_ssl_init_certinfo(data, (int)count);
      for(i = 0L ; !result && (i < count) ; i++) {
        server_cert = SecTrustGetCertificateAtIndex(trust, i);
        result = collect_server_cert_single(data, server_cert, i);
      }
      CFRelease(trust);
    }
  }
  else {
#if CURL_SUPPORT_MAC_10_8
    err = SSLCopyPeerCertificates(backend->ssl_ctx, &server_certs);
    /* Just in case SSLCopyPeerCertificates() returns null too... */
    if(err == noErr && server_certs) {
      count = CFArrayGetCount(server_certs);
      if(data->set.ssl.certinfo)
        result = Curl_ssl_init_certinfo(data, (int)count);
      for(i = 0L ; !result && (i < count) ; i++) {
        server_cert = (SecCertificateRef)CFArrayGetValueAtIndex(server_certs,
                                                                i);
        result = collect_server_cert_single(data, server_cert, i);
      }
      CFRelease(server_certs);
    }
#endif /* CURL_SUPPORT_MAC_10_8 */
  }
#endif /* CURL_BUILD_IOS */
#else
#pragma unused(trust)
  err = SSLCopyPeerCertificates(backend->ssl_ctx, &server_certs);
  if(err == noErr) {
    count = CFArrayGetCount(server_certs);
    if(data->set.ssl.certinfo)
      result = Curl_ssl_init_certinfo(data, (int)count);
    for(i = 0L ; !result && (i < count) ; i++) {
      server_cert = (SecCertificateRef)CFArrayGetValueAtIndex(server_certs, i);
      result = collect_server_cert_single(data, server_cert, i);
    }
    CFRelease(server_certs);
  }
#endif /* CURL_BUILD_MAC_10_7 || CURL_BUILD_IOS */
  return result;
}

static CURLcode
sectransp_connect_step3(struct Curl_easy *data, struct connectdata *conn,
                        int sockindex)
{
  struct ssl_connect_data *connssl = &conn->ssl[sockindex];

  /* There is no step 3!
   * Well, okay, let's collect server certificates, and if verbose mode is on,
   * let's print the details of the server certificates. */
  const CURLcode result = collect_server_cert(data, conn, sockindex);
  if(result)
    return result;

  connssl->connecting_state = ssl_connect_done;
  return CURLE_OK;
}

static Curl_recv sectransp_recv;
static Curl_send sectransp_send;

static CURLcode
sectransp_connect_common(struct Curl_easy *data,
                         struct connectdata *conn,
                         int sockindex,
                         bool nonblocking,
                         bool *done)
{
  CURLcode result;
  struct ssl_connect_data *connssl = &conn->ssl[sockindex];
  curl_socket_t sockfd = conn->sock[sockindex];
  int what;

  /* check if the connection has already been established */
  if(ssl_connection_complete == connssl->state) {
    *done = TRUE;
    return CURLE_OK;
  }

  if(ssl_connect_1 == connssl->connecting_state) {
    /* Find out how much more time we're allowed */
    const timediff_t timeout_ms = Curl_timeleft(data, NULL, TRUE);

    if(timeout_ms < 0) {
      /* no need to continue if time already is up */
      failf(data, "SSL connection timeout");
      return CURLE_OPERATION_TIMEDOUT;
    }

    result = sectransp_connect_step1(data, conn, sockindex);
    if(result)
      return result;
  }

  while(ssl_connect_2 == connssl->connecting_state ||
        ssl_connect_2_reading == connssl->connecting_state ||
        ssl_connect_2_writing == connssl->connecting_state) {

    /* check allowed time left */
    const timediff_t timeout_ms = Curl_timeleft(data, NULL, TRUE);

    if(timeout_ms < 0) {
      /* no need to continue if time already is up */
      failf(data, "SSL connection timeout");
      return CURLE_OPERATION_TIMEDOUT;
    }

    /* if ssl is expecting something, check if it's available. */
    if(connssl->connecting_state == ssl_connect_2_reading ||
       connssl->connecting_state == ssl_connect_2_writing) {

      curl_socket_t writefd = ssl_connect_2_writing ==
      connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
      curl_socket_t readfd = ssl_connect_2_reading ==
      connssl->connecting_state?sockfd:CURL_SOCKET_BAD;

      what = Curl_socket_check(readfd, CURL_SOCKET_BAD, writefd,
                               nonblocking ? 0 : timeout_ms);
      if(what < 0) {
        /* fatal error */
        failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
        return CURLE_SSL_CONNECT_ERROR;
      }
      else if(0 == what) {
        if(nonblocking) {
          *done = FALSE;
          return CURLE_OK;
        }
        else {
          /* timeout */
          failf(data, "SSL connection timeout");
          return CURLE_OPERATION_TIMEDOUT;
        }
      }
      /* socket is readable or writable */
    }

    /* Run transaction, and return to the caller if it failed or if this
     * connection is done nonblocking and this loop would execute again. This
     * permits the owner of a multi handle to abort a connection attempt
     * before step2 has completed while ensuring that a client using select()
     * or epoll() will always have a valid fdset to wait on.
     */
    result = sectransp_connect_step2(data, conn, sockindex);
    if(result || (nonblocking &&
                  (ssl_connect_2 == connssl->connecting_state ||
                   ssl_connect_2_reading == connssl->connecting_state ||
                   ssl_connect_2_writing == connssl->connecting_state)))
      return result;

  } /* repeat step2 until all transactions are done. */


  if(ssl_connect_3 == connssl->connecting_state) {
    result = sectransp_connect_step3(data, conn, sockindex);
    if(result)
      return result;
  }

  if(ssl_connect_done == connssl->connecting_state) {
    connssl->state = ssl_connection_complete;
    conn->recv[sockindex] = sectransp_recv;
    conn->send[sockindex] = sectransp_send;
    *done = TRUE;
  }
  else
    *done = FALSE;

  /* Reset our connect state machine */
  connssl->connecting_state = ssl_connect_1;

  return CURLE_OK;
}

static CURLcode sectransp_connect_nonblocking(struct Curl_easy *data,
                                              struct connectdata *conn,
                                              int sockindex, bool *done)
{
  return sectransp_connect_common(data, conn, sockindex, TRUE, done);
}

static CURLcode sectransp_connect(struct Curl_easy *data,
                                  struct connectdata *conn, int sockindex)
{
  CURLcode result;
  bool done = FALSE;

  result = sectransp_connect_common(data, conn, sockindex, FALSE, &done);

  if(result)
    return result;

  DEBUGASSERT(done);

  return CURLE_OK;
}

static void sectransp_close(struct Curl_easy *data, struct connectdata *conn,
                            int sockindex)
{
  struct ssl_connect_data *connssl = &conn->ssl[sockindex];
  struct ssl_backend_data *backend = connssl->backend;

  (void) data;

  DEBUGASSERT(backend);

  if(backend->ssl_ctx) {
    (void)SSLClose(backend->ssl_ctx);
#if CURL_BUILD_MAC_10_8 || CURL_BUILD_IOS
    if(SSLCreateContext)
      CFRelease(backend->ssl_ctx);
#if CURL_SUPPORT_MAC_10_8
    else
      (void)SSLDisposeContext(backend->ssl_ctx);
#endif  /* CURL_SUPPORT_MAC_10_8 */
#else
    (void)SSLDisposeContext(backend->ssl_ctx);
#endif /* CURL_BUILD_MAC_10_8 || CURL_BUILD_IOS */
    backend->ssl_ctx = NULL;
  }
  backend->ssl_sockfd = 0;
}

static int sectransp_shutdown(struct Curl_easy *data,
                              struct connectdata *conn, int sockindex)
{
  struct ssl_connect_data *connssl = &conn->ssl[sockindex];
  struct ssl_backend_data *backend = connssl->backend;
  ssize_t nread;
  int what;
  int rc;
  char buf[120];
  int loop = 10; /* avoid getting stuck */

  DEBUGASSERT(backend);

  if(!backend->ssl_ctx)
    return 0;

#ifndef CURL_DISABLE_FTP
  if(data->set.ftp_ccc != CURLFTPSSL_CCC_ACTIVE)
    return 0;
#endif

  sectransp_close(data, conn, sockindex);

  rc = 0;

  what = SOCKET_READABLE(conn->sock[sockindex], SSL_SHUTDOWN_TIMEOUT);

  while(loop--) {
    if(what < 0) {
      /* anything that gets here is fatally bad */
      failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
      rc = -1;
      break;
    }

    if(!what) {                                /* timeout */
      failf(data, "SSL shutdown timeout");
      break;
    }

    /* Something to read, let's do it and hope that it is the close
     notify alert from the server. No way to SSL_Read now, so use read(). */

    nread = read(conn->sock[sockindex], buf, sizeof(buf));

    if(nread < 0) {
      char buffer[STRERROR_LEN];
      failf(data, "read: %s",
            Curl_strerror(errno, buffer, sizeof(buffer)));
      rc = -1;
    }

    if(nread <= 0)
      break;

    what = SOCKET_READABLE(conn->sock[sockindex], 0);
  }

  return rc;
}

static void sectransp_session_free(void *ptr)
{
  /* ST, as of iOS 5 and Mountain Lion, has no public method of deleting a
     cached session ID inside the Security framework. There is a private
     function that does this, but I don't want to have to explain to you why I
     got your application rejected from the App Store due to the use of a
     private API, so the best we can do is free up our own char array that we
     created way back in sectransp_connect_step1... */
  Curl_safefree(ptr);
}

static size_t sectransp_version(char *buffer, size_t size)
{
  return msnprintf(buffer, size, "SecureTransport");
}

/*
 * This function uses SSLGetSessionState to determine connection status.
 *
 * Return codes:
 *     1 means the connection is still in place
 *     0 means the connection has been closed
 *    -1 means the connection status is unknown
 */
static int sectransp_check_cxn(struct connectdata *conn)
{
  struct ssl_connect_data *connssl = &conn->ssl[FIRSTSOCKET];
  struct ssl_backend_data *backend = connssl->backend;
  OSStatus err;
  SSLSessionState state;

  DEBUGASSERT(backend);

  if(backend->ssl_ctx) {
    err = SSLGetSessionState(backend->ssl_ctx, &state);
    if(err == noErr)
      return state == kSSLConnected || state == kSSLHandshake;
    return -1;
  }
  return 0;
}

static bool sectransp_data_pending(const struct connectdata *conn,
                                   int connindex)
{
  const struct ssl_connect_data *connssl = &conn->ssl[connindex];
  struct ssl_backend_data *backend = connssl->backend;
  OSStatus err;
  size_t buffer;

  DEBUGASSERT(backend);

  if(backend->ssl_ctx) {  /* SSL is in use */
    err = SSLGetBufferedReadSize(backend->ssl_ctx, &buffer);
    if(err == noErr)
      return buffer > 0UL;
    return false;
  }
  else
    return false;
}

static CURLcode sectransp_random(struct Curl_easy *data UNUSED_PARAM,
                                 unsigned char *entropy, size_t length)
{
  /* arc4random_buf() isn't available on cats older than Lion, so let's
     do this manually for the benefit of the older cats. */
  size_t i;
  u_int32_t random_number = 0;

  (void)data;

  for(i = 0 ; i < length ; i++) {
    if(i % sizeof(u_int32_t) == 0)
      random_number = arc4random();
    entropy[i] = random_number & 0xFF;
    random_number >>= 8;
  }
  i = random_number = 0;
  return CURLE_OK;
}

static CURLcode sectransp_sha256sum(const unsigned char *tmp, /* input */
                                    size_t tmplen,
                                    unsigned char *sha256sum, /* output */
                                    size_t sha256len)
{
  assert(sha256len >= CURL_SHA256_DIGEST_LENGTH);
  (void)CC_SHA256(tmp, (CC_LONG)tmplen, sha256sum);
  return CURLE_OK;
}

static bool sectransp_false_start(void)
{
#if CURL_BUILD_MAC_10_9 || CURL_BUILD_IOS_7
  if(SSLSetSessionOption)
    return TRUE;
#endif
  return FALSE;
}

static ssize_t sectransp_send(struct Curl_easy *data,
                              int sockindex,
                              const void *mem,
                              size_t len,
                              CURLcode *curlcode)
{
  struct connectdata *conn = data->conn;
  struct ssl_connect_data *connssl = &conn->ssl[sockindex];
  struct ssl_backend_data *backend = connssl->backend;
  size_t processed = 0UL;
  OSStatus err;

  DEBUGASSERT(backend);

  /* The SSLWrite() function works a little differently than expected. The
     fourth argument (processed) is currently documented in Apple's
     documentation as: "On return, the length, in bytes, of the data actually
     written."

     Now, one could interpret that as "written to the socket," but actually,
     it returns the amount of data that was written to a buffer internal to
     the SSLContextRef instead. So it's possible for SSLWrite() to return
     errSSLWouldBlock and a number of bytes "written" because those bytes were
     encrypted and written to a buffer, not to the socket.

     So if this happens, then we need to keep calling SSLWrite() over and
     over again with no new data until it quits returning errSSLWouldBlock. */

  /* Do we have buffered data to write from the last time we were called? */
  if(backend->ssl_write_buffered_length) {
    /* Write the buffered data: */
    err = SSLWrite(backend->ssl_ctx, NULL, 0UL, &processed);
    switch(err) {
      case noErr:
        /* processed is always going to be 0 because we didn't write to
           the buffer, so return how much was written to the socket */
        processed = backend->ssl_write_buffered_length;
        backend->ssl_write_buffered_length = 0UL;
        break;
      case errSSLWouldBlock: /* argh, try again */
        *curlcode = CURLE_AGAIN;
        return -1L;
      default:
        failf(data, "SSLWrite() returned error %d", err);
        *curlcode = CURLE_SEND_ERROR;
        return -1L;
    }
  }
  else {
    /* We've got new data to write: */
    err = SSLWrite(backend->ssl_ctx, mem, len, &processed);
    if(err != noErr) {
      switch(err) {
        case errSSLWouldBlock:
          /* Data was buffered but not sent, we have to tell the caller
             to try sending again, and remember how much was buffered */
          backend->ssl_write_buffered_length = len;
          *curlcode = CURLE_AGAIN;
          return -1L;
        default:
          failf(data, "SSLWrite() returned error %d", err);
          *curlcode = CURLE_SEND_ERROR;
          return -1L;
      }
    }
  }
  return (ssize_t)processed;
}

static ssize_t sectransp_recv(struct Curl_easy *data,
                              int num,
                              char *buf,
                              size_t buffersize,
                              CURLcode *curlcode)
{
  struct connectdata *conn = data->conn;
  struct ssl_connect_data *connssl = &conn->ssl[num];
  struct ssl_backend_data *backend = connssl->backend;
  size_t processed = 0UL;
  OSStatus err;

  DEBUGASSERT(backend);

  again:
  err = SSLRead(backend->ssl_ctx, buf, buffersize, &processed);

  if(err != noErr) {
    switch(err) {
      case errSSLWouldBlock:  /* return how much we read (if anything) */
        if(processed)
          return (ssize_t)processed;
        *curlcode = CURLE_AGAIN;
        return -1L;
        break;

      /* errSSLClosedGraceful - server gracefully shut down the SSL session
         errSSLClosedNoNotify - server hung up on us instead of sending a
           closure alert notice, read() is returning 0
         Either way, inform the caller that the server disconnected. */
      case errSSLClosedGraceful:
      case errSSLClosedNoNotify:
        *curlcode = CURLE_OK;
        return -1L;
        break;

        /* The below is errSSLPeerAuthCompleted; it's not defined in
           Leopard's headers */
      case -9841:
        if((SSL_CONN_CONFIG(CAfile) || SSL_CONN_CONFIG(ca_info_blob)) &&
           SSL_CONN_CONFIG(verifypeer)) {
          CURLcode result = verify_cert(data, SSL_CONN_CONFIG(CAfile),
                                        SSL_CONN_CONFIG(ca_info_blob),
                                        backend->ssl_ctx);
          if(result)
            return result;
        }
        goto again;
      default:
        failf(data, "SSLRead() return error %d", err);
        *curlcode = CURLE_RECV_ERROR;
        return -1L;
        break;
    }
  }
  return (ssize_t)processed;
}

static void *sectransp_get_internals(struct ssl_connect_data *connssl,
                                     CURLINFO info UNUSED_PARAM)
{
  struct ssl_backend_data *backend = connssl->backend;
  (void)info;
  DEBUGASSERT(backend);
  return backend->ssl_ctx;
}

const struct Curl_ssl Curl_ssl_sectransp = {
  { CURLSSLBACKEND_SECURETRANSPORT, "secure-transport" }, /* info */

  SSLSUPP_CAINFO_BLOB |
  SSLSUPP_CERTINFO |
#ifdef SECTRANSP_PINNEDPUBKEY
  SSLSUPP_PINNEDPUBKEY,
#else
  0,
#endif /* SECTRANSP_PINNEDPUBKEY */

  sizeof(struct ssl_backend_data),

  Curl_none_init,                     /* init */
  Curl_none_cleanup,                  /* cleanup */
  sectransp_version,                  /* version */
  sectransp_check_cxn,                /* check_cxn */
  sectransp_shutdown,                 /* shutdown */
  sectransp_data_pending,             /* data_pending */
  sectransp_random,                   /* random */
  Curl_none_cert_status_request,      /* cert_status_request */
  sectransp_connect,                  /* connect */
  sectransp_connect_nonblocking,      /* connect_nonblocking */
  Curl_ssl_getsock,                   /* getsock */
  sectransp_get_internals,            /* get_internals */
  sectransp_close,                    /* close_one */
  Curl_none_close_all,                /* close_all */
  sectransp_session_free,             /* session_free */
  Curl_none_set_engine,               /* set_engine */
  Curl_none_set_engine_default,       /* set_engine_default */
  Curl_none_engines_list,             /* engines_list */
  sectransp_false_start,              /* false_start */
  sectransp_sha256sum,                /* sha256sum */
  NULL,                               /* associate_connection */
  NULL                                /* disassociate_connection */
};

#ifdef __clang__
#pragma clang diagnostic pop
#endif

#endif /* USE_SECTRANSP */