aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/libs/openssl/crypto/mem_sec.c
blob: 222c786cbaeff0e798a57a42fc429cc70bed913f (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
/*
 * Copyright 2015-2020 The OpenSSL Project Authors. All Rights Reserved.
 * Copyright 2004-2014, Akamai Technologies. All Rights Reserved.
 *
 * Licensed under the OpenSSL license (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

/*
 * This file is in two halves. The first half implements the public API
 * to be used by external consumers, and to be used by OpenSSL to store
 * data in a "secure arena." The second half implements the secure arena.
 * For details on that implementation, see below (look for uppercase
 * "SECURE HEAP IMPLEMENTATION").
 */
#include "e_os.h"
#include <openssl/crypto.h>

#include <string.h>

/* e_os.h defines OPENSSL_SECURE_MEMORY if secure memory can be implemented */
#ifdef OPENSSL_SECURE_MEMORY
# include <stdlib.h>
# include <assert.h>
# include <unistd.h>
# include <sys/types.h>
# include <sys/mman.h>
# if defined(OPENSSL_SYS_LINUX)
#  include <sys/syscall.h>
#  if defined(SYS_mlock2)
#   include <linux/mman.h>
#   include <errno.h>
#  endif
# endif
# if defined(__FreeBSD__)
#  define MADV_DONTDUMP MADV_NOCORE
# endif
# if !defined(MAP_CONCEAL)
#  define MAP_CONCEAL 0
# endif
# include <sys/param.h>
# include <sys/stat.h>
# include <fcntl.h>
#endif

#define CLEAR(p, s) OPENSSL_cleanse(p, s)
#ifndef PAGE_SIZE
# define PAGE_SIZE    4096
#endif
#if !defined(MAP_ANON) && defined(MAP_ANONYMOUS)
# define MAP_ANON MAP_ANONYMOUS
#endif

#ifdef OPENSSL_SECURE_MEMORY
static size_t secure_mem_used;

static int secure_mem_initialized;

static CRYPTO_RWLOCK *sec_malloc_lock = NULL;

/*
 * These are the functions that must be implemented by a secure heap (sh).
 */
static int sh_init(size_t size, int minsize);
static void *sh_malloc(size_t size);
static void sh_free(void *ptr);
static void sh_done(void);
static size_t sh_actual_size(char *ptr);
static int sh_allocated(const char *ptr);
#endif

int CRYPTO_secure_malloc_init(size_t size, int minsize)
{
#ifdef OPENSSL_SECURE_MEMORY
    int ret = 0;

    if (!secure_mem_initialized) {
        sec_malloc_lock = CRYPTO_THREAD_lock_new();
        if (sec_malloc_lock == NULL)
            return 0;
        if ((ret = sh_init(size, minsize)) != 0) {
            secure_mem_initialized = 1;
        } else {
            CRYPTO_THREAD_lock_free(sec_malloc_lock);
            sec_malloc_lock = NULL;
        }
    }

    return ret;
#else
    return 0;
#endif /* OPENSSL_SECURE_MEMORY */
}

int CRYPTO_secure_malloc_done(void)
{
#ifdef OPENSSL_SECURE_MEMORY
    if (secure_mem_used == 0) {
        sh_done();
        secure_mem_initialized = 0;
        CRYPTO_THREAD_lock_free(sec_malloc_lock);
        sec_malloc_lock = NULL;
        return 1;
    }
#endif /* OPENSSL_SECURE_MEMORY */
    return 0;
}

int CRYPTO_secure_malloc_initialized(void)
{
#ifdef OPENSSL_SECURE_MEMORY
    return secure_mem_initialized;
#else
    return 0;
#endif /* OPENSSL_SECURE_MEMORY */
}

void *CRYPTO_secure_malloc(size_t num, const char *file, int line)
{
#ifdef OPENSSL_SECURE_MEMORY
    void *ret;
    size_t actual_size;

    if (!secure_mem_initialized) {
        return CRYPTO_malloc(num, file, line);
    }
    CRYPTO_THREAD_write_lock(sec_malloc_lock);
    ret = sh_malloc(num);
    actual_size = ret ? sh_actual_size(ret) : 0;
    secure_mem_used += actual_size;
    CRYPTO_THREAD_unlock(sec_malloc_lock);
    return ret;
#else
    return CRYPTO_malloc(num, file, line);
#endif /* OPENSSL_SECURE_MEMORY */
}

void *CRYPTO_secure_zalloc(size_t num, const char *file, int line)
{
#ifdef OPENSSL_SECURE_MEMORY
    if (secure_mem_initialized)
        /* CRYPTO_secure_malloc() zeroes allocations when it is implemented */
        return CRYPTO_secure_malloc(num, file, line);
#endif
    return CRYPTO_zalloc(num, file, line);
}

void CRYPTO_secure_free(void *ptr, const char *file, int line)
{
#ifdef OPENSSL_SECURE_MEMORY
    size_t actual_size;

    if (ptr == NULL)
        return;
    if (!CRYPTO_secure_allocated(ptr)) {
        CRYPTO_free(ptr, file, line);
        return;
    }
    CRYPTO_THREAD_write_lock(sec_malloc_lock);
    actual_size = sh_actual_size(ptr);
    CLEAR(ptr, actual_size);
    secure_mem_used -= actual_size;
    sh_free(ptr);
    CRYPTO_THREAD_unlock(sec_malloc_lock);
#else
    CRYPTO_free(ptr, file, line);
#endif /* OPENSSL_SECURE_MEMORY */
}

void CRYPTO_secure_clear_free(void *ptr, size_t num,
                              const char *file, int line)
{
#ifdef OPENSSL_SECURE_MEMORY
    size_t actual_size;

    if (ptr == NULL)
        return;
    if (!CRYPTO_secure_allocated(ptr)) {
        OPENSSL_cleanse(ptr, num);
        CRYPTO_free(ptr, file, line);
        return;
    }
    CRYPTO_THREAD_write_lock(sec_malloc_lock);
    actual_size = sh_actual_size(ptr);
    CLEAR(ptr, actual_size);
    secure_mem_used -= actual_size;
    sh_free(ptr);
    CRYPTO_THREAD_unlock(sec_malloc_lock);
#else
    if (ptr == NULL)
        return;
    OPENSSL_cleanse(ptr, num);
    CRYPTO_free(ptr, file, line);
#endif /* OPENSSL_SECURE_MEMORY */
}

int CRYPTO_secure_allocated(const void *ptr)
{
#ifdef OPENSSL_SECURE_MEMORY
    int ret;

    if (!secure_mem_initialized)
        return 0;
    CRYPTO_THREAD_write_lock(sec_malloc_lock);
    ret = sh_allocated(ptr);
    CRYPTO_THREAD_unlock(sec_malloc_lock);
    return ret;
#else
    return 0;
#endif /* OPENSSL_SECURE_MEMORY */
}

size_t CRYPTO_secure_used(void)
{
#ifdef OPENSSL_SECURE_MEMORY
    return secure_mem_used;
#else
    return 0;
#endif /* OPENSSL_SECURE_MEMORY */
}

size_t CRYPTO_secure_actual_size(void *ptr)
{
#ifdef OPENSSL_SECURE_MEMORY
    size_t actual_size;

    CRYPTO_THREAD_write_lock(sec_malloc_lock);
    actual_size = sh_actual_size(ptr);
    CRYPTO_THREAD_unlock(sec_malloc_lock);
    return actual_size;
#else
    return 0;
#endif
}
/* END OF PAGE ...

   ... START OF PAGE */

/*
 * SECURE HEAP IMPLEMENTATION
 */
#ifdef OPENSSL_SECURE_MEMORY


/*
 * The implementation provided here uses a fixed-sized mmap() heap,
 * which is locked into memory, not written to core files, and protected
 * on either side by an unmapped page, which will catch pointer overruns
 * (or underruns) and an attempt to read data out of the secure heap.
 * Free'd memory is zero'd or otherwise cleansed.
 *
 * This is a pretty standard buddy allocator.  We keep areas in a multiple
 * of "sh.minsize" units.  The freelist and bitmaps are kept separately,
 * so all (and only) data is kept in the mmap'd heap.
 *
 * This code assumes eight-bit bytes.  The numbers 3 and 7 are all over the
 * place.
 */

#define ONE ((size_t)1)

# define TESTBIT(t, b)  (t[(b) >> 3] &  (ONE << ((b) & 7)))
# define SETBIT(t, b)   (t[(b) >> 3] |= (ONE << ((b) & 7)))
# define CLEARBIT(t, b) (t[(b) >> 3] &= (0xFF & ~(ONE << ((b) & 7))))

#define WITHIN_ARENA(p) \
    ((char*)(p) >= sh.arena && (char*)(p) < &sh.arena[sh.arena_size])
#define WITHIN_FREELIST(p) \
    ((char*)(p) >= (char*)sh.freelist && (char*)(p) < (char*)&sh.freelist[sh.freelist_size])


typedef struct sh_list_st
{
    struct sh_list_st *next;
    struct sh_list_st **p_next;
} SH_LIST;

typedef struct sh_st
{
    char* map_result;
    size_t map_size;
    char *arena;
    size_t arena_size;
    char **freelist;
    ossl_ssize_t freelist_size;
    size_t minsize;
    unsigned char *bittable;
    unsigned char *bitmalloc;
    size_t bittable_size; /* size in bits */
} SH;

static SH sh;

static size_t sh_getlist(char *ptr)
{
    ossl_ssize_t list = sh.freelist_size - 1;
    size_t bit = (sh.arena_size + ptr - sh.arena) / sh.minsize;

    for (; bit; bit >>= 1, list--) {
        if (TESTBIT(sh.bittable, bit))
            break;
        OPENSSL_assert((bit & 1) == 0);
    }

    return list;
}


static int sh_testbit(char *ptr, int list, unsigned char *table)
{
    size_t bit;

    OPENSSL_assert(list >= 0 && list < sh.freelist_size);
    OPENSSL_assert(((ptr - sh.arena) & ((sh.arena_size >> list) - 1)) == 0);
    bit = (ONE << list) + ((ptr - sh.arena) / (sh.arena_size >> list));
    OPENSSL_assert(bit > 0 && bit < sh.bittable_size);
    return TESTBIT(table, bit);
}

static void sh_clearbit(char *ptr, int list, unsigned char *table)
{
    size_t bit;

    OPENSSL_assert(list >= 0 && list < sh.freelist_size);
    OPENSSL_assert(((ptr - sh.arena) & ((sh.arena_size >> list) - 1)) == 0);
    bit = (ONE << list) + ((ptr - sh.arena) / (sh.arena_size >> list));
    OPENSSL_assert(bit > 0 && bit < sh.bittable_size);
    OPENSSL_assert(TESTBIT(table, bit));
    CLEARBIT(table, bit);
}

static void sh_setbit(char *ptr, int list, unsigned char *table)
{
    size_t bit;

    OPENSSL_assert(list >= 0 && list < sh.freelist_size);
    OPENSSL_assert(((ptr - sh.arena) & ((sh.arena_size >> list) - 1)) == 0);
    bit = (ONE << list) + ((ptr - sh.arena) / (sh.arena_size >> list));
    OPENSSL_assert(bit > 0 && bit < sh.bittable_size);
    OPENSSL_assert(!TESTBIT(table, bit));
    SETBIT(table, bit);
}

static void sh_add_to_list(char **list, char *ptr)
{
    SH_LIST *temp;

    OPENSSL_assert(WITHIN_FREELIST(list));
    OPENSSL_assert(WITHIN_ARENA(ptr));

    temp = (SH_LIST *)ptr;
    temp->next = *(SH_LIST **)list;
    OPENSSL_assert(temp->next == NULL || WITHIN_ARENA(temp->next));
    temp->p_next = (SH_LIST **)list;

    if (temp->next != NULL) {
        OPENSSL_assert((char **)temp->next->p_next == list);
        temp->next->p_next = &(temp->next);
    }

    *list = ptr;
}

static void sh_remove_from_list(char *ptr)
{
    SH_LIST *temp, *temp2;

    temp = (SH_LIST *)ptr;
    if (temp->next != NULL)
        temp->next->p_next = temp->p_next;
    *temp->p_next = temp->next;
    if (temp->next == NULL)
        return;

    temp2 = temp->next;
    OPENSSL_assert(WITHIN_FREELIST(temp2->p_next) || WITHIN_ARENA(temp2->p_next));
}


static int sh_init(size_t size, int minsize)
{
    int ret;
    size_t i;
    size_t pgsize;
    size_t aligned;

    memset(&sh, 0, sizeof(sh));

    /* make sure size and minsize are powers of 2 */
    OPENSSL_assert(size > 0);
    OPENSSL_assert((size & (size - 1)) == 0);
    OPENSSL_assert(minsize > 0);
    OPENSSL_assert((minsize & (minsize - 1)) == 0);
    if (size <= 0 || (size & (size - 1)) != 0)
        goto err;
    if (minsize <= 0 || (minsize & (minsize - 1)) != 0)
        goto err;

    while (minsize < (int)sizeof(SH_LIST))
        minsize *= 2;

    sh.arena_size = size;
    sh.minsize = minsize;
    sh.bittable_size = (sh.arena_size / sh.minsize) * 2;

    /* Prevent allocations of size 0 later on */
    if (sh.bittable_size >> 3 == 0)
        goto err;

    sh.freelist_size = -1;
    for (i = sh.bittable_size; i; i >>= 1)
        sh.freelist_size++;

    sh.freelist = OPENSSL_zalloc(sh.freelist_size * sizeof(char *));
    OPENSSL_assert(sh.freelist != NULL);
    if (sh.freelist == NULL)
        goto err;

    sh.bittable = OPENSSL_zalloc(sh.bittable_size >> 3);
    OPENSSL_assert(sh.bittable != NULL);
    if (sh.bittable == NULL)
        goto err;

    sh.bitmalloc = OPENSSL_zalloc(sh.bittable_size >> 3);
    OPENSSL_assert(sh.bitmalloc != NULL);
    if (sh.bitmalloc == NULL)
        goto err;

    /* Allocate space for heap, and two extra pages as guards */
#if defined(_SC_PAGE_SIZE) || defined (_SC_PAGESIZE)
    {
# if defined(_SC_PAGE_SIZE)
        long tmppgsize = sysconf(_SC_PAGE_SIZE);
# else
        long tmppgsize = sysconf(_SC_PAGESIZE);
# endif
        if (tmppgsize < 1)
            pgsize = PAGE_SIZE;
        else
            pgsize = (size_t)tmppgsize;
    }
#else
    pgsize = PAGE_SIZE;
#endif
    sh.map_size = pgsize + sh.arena_size + pgsize;
    if (1) {
#ifdef MAP_ANON
        sh.map_result = mmap(NULL, sh.map_size,
                             PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE|MAP_CONCEAL, -1, 0);
    } else {
#endif
        int fd;

        sh.map_result = MAP_FAILED;
        if ((fd = open("/dev/zero", O_RDWR)) >= 0) {
            sh.map_result = mmap(NULL, sh.map_size,
                                 PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
            close(fd);
        }
    }
    if (sh.map_result == MAP_FAILED)
        goto err;
    sh.arena = (char *)(sh.map_result + pgsize);
    sh_setbit(sh.arena, 0, sh.bittable);
    sh_add_to_list(&sh.freelist[0], sh.arena);

    /* Now try to add guard pages and lock into memory. */
    ret = 1;

    /* Starting guard is already aligned from mmap. */
    if (mprotect(sh.map_result, pgsize, PROT_NONE) < 0)
        ret = 2;

    /* Ending guard page - need to round up to page boundary */
    aligned = (pgsize + sh.arena_size + (pgsize - 1)) & ~(pgsize - 1);
    if (mprotect(sh.map_result + aligned, pgsize, PROT_NONE) < 0)
        ret = 2;

#if defined(OPENSSL_SYS_LINUX) && defined(MLOCK_ONFAULT) && defined(SYS_mlock2)
    if (syscall(SYS_mlock2, sh.arena, sh.arena_size, MLOCK_ONFAULT) < 0) {
        if (errno == ENOSYS) {
            if (mlock(sh.arena, sh.arena_size) < 0)
                ret = 2;
        } else {
            ret = 2;
        }
    }
#else
    if (mlock(sh.arena, sh.arena_size) < 0)
        ret = 2;
#endif
#ifdef MADV_DONTDUMP
    if (madvise(sh.arena, sh.arena_size, MADV_DONTDUMP) < 0)
        ret = 2;
#endif

    return ret;

 err:
    sh_done();
    return 0;
}

static void sh_done(void)
{
    OPENSSL_free(sh.freelist);
    OPENSSL_free(sh.bittable);
    OPENSSL_free(sh.bitmalloc);
    if (sh.map_result != MAP_FAILED && sh.map_size)
        munmap(sh.map_result, sh.map_size);
    memset(&sh, 0, sizeof(sh));
}

static int sh_allocated(const char *ptr)
{
    return WITHIN_ARENA(ptr) ? 1 : 0;
}

static char *sh_find_my_buddy(char *ptr, int list)
{
    size_t bit;
    char *chunk = NULL;

    bit = (ONE << list) + (ptr - sh.arena) / (sh.arena_size >> list);
    bit ^= 1;

    if (TESTBIT(sh.bittable, bit) && !TESTBIT(sh.bitmalloc, bit))
        chunk = sh.arena + ((bit & ((ONE << list) - 1)) * (sh.arena_size >> list));

    return chunk;
}

static void *sh_malloc(size_t size)
{
    ossl_ssize_t list, slist;
    size_t i;
    char *chunk;

    if (size > sh.arena_size)
        return NULL;

    list = sh.freelist_size - 1;
    for (i = sh.minsize; i < size; i <<= 1)
        list--;
    if (list < 0)
        return NULL;

    /* try to find a larger entry to split */
    for (slist = list; slist >= 0; slist--)
        if (sh.freelist[slist] != NULL)
            break;
    if (slist < 0)
        return NULL;

    /* split larger entry */
    while (slist != list) {
        char *temp = sh.freelist[slist];

        /* remove from bigger list */
        OPENSSL_assert(!sh_testbit(temp, slist, sh.bitmalloc));
        sh_clearbit(temp, slist, sh.bittable);
        sh_remove_from_list(temp);
        OPENSSL_assert(temp != sh.freelist[slist]);

        /* done with bigger list */
        slist++;

        /* add to smaller list */
        OPENSSL_assert(!sh_testbit(temp, slist, sh.bitmalloc));
        sh_setbit(temp, slist, sh.bittable);
        sh_add_to_list(&sh.freelist[slist], temp);
        OPENSSL_assert(sh.freelist[slist] == temp);

        /* split in 2 */
        temp += sh.arena_size >> slist;
        OPENSSL_assert(!sh_testbit(temp, slist, sh.bitmalloc));
        sh_setbit(temp, slist, sh.bittable);
        sh_add_to_list(&sh.freelist[slist], temp);
        OPENSSL_assert(sh.freelist[slist] == temp);

        OPENSSL_assert(temp-(sh.arena_size >> slist) == sh_find_my_buddy(temp, slist));
    }

    /* peel off memory to hand back */
    chunk = sh.freelist[list];
    OPENSSL_assert(sh_testbit(chunk, list, sh.bittable));
    sh_setbit(chunk, list, sh.bitmalloc);
    sh_remove_from_list(chunk);

    OPENSSL_assert(WITHIN_ARENA(chunk));

    /* zero the free list header as a precaution against information leakage */
    memset(chunk, 0, sizeof(SH_LIST));

    return chunk;
}

static void sh_free(void *ptr)
{
    size_t list;
    void *buddy;

    if (ptr == NULL)
        return;
    OPENSSL_assert(WITHIN_ARENA(ptr));
    if (!WITHIN_ARENA(ptr))
        return;

    list = sh_getlist(ptr);
    OPENSSL_assert(sh_testbit(ptr, list, sh.bittable));
    sh_clearbit(ptr, list, sh.bitmalloc);
    sh_add_to_list(&sh.freelist[list], ptr);

    /* Try to coalesce two adjacent free areas. */
    while ((buddy = sh_find_my_buddy(ptr, list)) != NULL) {
        OPENSSL_assert(ptr == sh_find_my_buddy(buddy, list));
        OPENSSL_assert(ptr != NULL);
        OPENSSL_assert(!sh_testbit(ptr, list, sh.bitmalloc));
        sh_clearbit(ptr, list, sh.bittable);
        sh_remove_from_list(ptr);
        OPENSSL_assert(!sh_testbit(ptr, list, sh.bitmalloc));
        sh_clearbit(buddy, list, sh.bittable);
        sh_remove_from_list(buddy);

        list--;

        /* Zero the higher addressed block's free list pointers */
        memset(ptr > buddy ? ptr : buddy, 0, sizeof(SH_LIST));
        if (ptr > buddy)
            ptr = buddy;

        OPENSSL_assert(!sh_testbit(ptr, list, sh.bitmalloc));
        sh_setbit(ptr, list, sh.bittable);
        sh_add_to_list(&sh.freelist[list], ptr);
        OPENSSL_assert(sh.freelist[list] == ptr);
    }
}

static size_t sh_actual_size(char *ptr)
{
    int list;

    OPENSSL_assert(WITHIN_ARENA(ptr));
    if (!WITHIN_ARENA(ptr))
        return 0;
    list = sh_getlist(ptr);
    OPENSSL_assert(sh_testbit(ptr, list, sh.bittable));
    return sh.arena_size / (ONE << list);
}
#endif /* OPENSSL_SECURE_MEMORY */