aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/libs/openssl/crypto/blake2/blake2b.c
blob: fc6e5f1a3f3cc10088789dfddb286858bcd041ae (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
/*
 * Copyright 2016-2019 The OpenSSL Project Authors. 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
 */

/*
 * Derived from the BLAKE2 reference implementation written by Samuel Neves.
 * Copyright 2012, Samuel Neves <sneves@dei.uc.pt>
 * More information about the BLAKE2 hash function and its implementations
 * can be found at https://blake2.net.
 */

#include <assert.h>
#include <string.h>
#include <openssl/crypto.h>

#include "blake2_local.h"
#include "blake2_impl.h"

static const uint64_t blake2b_IV[8] =
{
    0x6a09e667f3bcc908ULL, 0xbb67ae8584caa73bULL,
    0x3c6ef372fe94f82bULL, 0xa54ff53a5f1d36f1ULL,
    0x510e527fade682d1ULL, 0x9b05688c2b3e6c1fULL,
    0x1f83d9abfb41bd6bULL, 0x5be0cd19137e2179ULL
};

static const uint8_t blake2b_sigma[12][16] =
{
    {  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15 } ,
    { 14, 10,  4,  8,  9, 15, 13,  6,  1, 12,  0,  2, 11,  7,  5,  3 } ,
    { 11,  8, 12,  0,  5,  2, 15, 13, 10, 14,  3,  6,  7,  1,  9,  4 } ,
    {  7,  9,  3,  1, 13, 12, 11, 14,  2,  6,  5, 10,  4,  0, 15,  8 } ,
    {  9,  0,  5,  7,  2,  4, 10, 15, 14,  1, 11, 12,  6,  8,  3, 13 } ,
    {  2, 12,  6, 10,  0, 11,  8,  3,  4, 13,  7,  5, 15, 14,  1,  9 } ,
    { 12,  5,  1, 15, 14, 13,  4, 10,  0,  7,  6,  3,  9,  2,  8, 11 } ,
    { 13, 11,  7, 14, 12,  1,  3,  9,  5,  0, 15,  4,  8,  6,  2, 10 } ,
    {  6, 15, 14,  9, 11,  3,  0,  8, 12,  2, 13,  7,  1,  4, 10,  5 } ,
    { 10,  2,  8,  4,  7,  6,  1,  5, 15, 11,  9, 14,  3, 12, 13 , 0 } ,
    {  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15 } ,
    { 14, 10,  4,  8,  9, 15, 13,  6,  1, 12,  0,  2, 11,  7,  5,  3 }
};

/* Set that it's the last block we'll compress */
static ossl_inline void blake2b_set_lastblock(BLAKE2B_CTX *S)
{
    S->f[0] = -1;
}

/* Initialize the hashing state. */
static ossl_inline void blake2b_init0(BLAKE2B_CTX *S)
{
    int i;

    memset(S, 0, sizeof(BLAKE2B_CTX));
    for (i = 0; i < 8; ++i) {
        S->h[i] = blake2b_IV[i];
    }
}

/* init xors IV with input parameter block */
static void blake2b_init_param(BLAKE2B_CTX *S, const BLAKE2B_PARAM *P)
{
    size_t i;
    const uint8_t *p = (const uint8_t *)(P);
    blake2b_init0(S);

    /* The param struct is carefully hand packed, and should be 64 bytes on
     * every platform. */
    assert(sizeof(BLAKE2B_PARAM) == 64);
    /* IV XOR ParamBlock */
    for (i = 0; i < 8; ++i) {
        S->h[i] ^= load64(p + sizeof(S->h[i]) * i);
    }
}

/* Initialize the hashing context.  Always returns 1. */
int BLAKE2b_Init(BLAKE2B_CTX *c)
{
    BLAKE2B_PARAM P[1];
    P->digest_length = BLAKE2B_DIGEST_LENGTH;
    P->key_length    = 0;
    P->fanout        = 1;
    P->depth         = 1;
    store32(P->leaf_length, 0);
    store64(P->node_offset, 0);
    P->node_depth    = 0;
    P->inner_length  = 0;
    memset(P->reserved, 0, sizeof(P->reserved));
    memset(P->salt,     0, sizeof(P->salt));
    memset(P->personal, 0, sizeof(P->personal));
    blake2b_init_param(c, P);
    return 1;
}

/* Permute the state while xoring in the block of data. */
static void blake2b_compress(BLAKE2B_CTX *S,
                            const uint8_t *blocks,
                            size_t len)
{
    uint64_t m[16];
    uint64_t v[16];
    int i;
    size_t increment;

    /*
     * There are two distinct usage vectors for this function:
     *
     * a) BLAKE2b_Update uses it to process complete blocks,
     *    possibly more than one at a time;
     *
     * b) BLAK2b_Final uses it to process last block, always
     *    single but possibly incomplete, in which case caller
     *    pads input with zeros.
     */
    assert(len < BLAKE2B_BLOCKBYTES || len % BLAKE2B_BLOCKBYTES == 0);

    /*
     * Since last block is always processed with separate call,
     * |len| not being multiple of complete blocks can be observed
     * only with |len| being less than BLAKE2B_BLOCKBYTES ("less"
     * including even zero), which is why following assignment doesn't
     * have to reside inside the main loop below.
     */
    increment = len < BLAKE2B_BLOCKBYTES ? len : BLAKE2B_BLOCKBYTES;

    for (i = 0; i < 8; ++i) {
        v[i] = S->h[i];
    }

    do {
        for (i = 0; i < 16; ++i) {
            m[i] = load64(blocks + i * sizeof(m[i]));
        }

        /* blake2b_increment_counter */
        S->t[0] += increment;
        S->t[1] += (S->t[0] < increment);

        v[8]  = blake2b_IV[0];
        v[9]  = blake2b_IV[1];
        v[10] = blake2b_IV[2];
        v[11] = blake2b_IV[3];
        v[12] = S->t[0] ^ blake2b_IV[4];
        v[13] = S->t[1] ^ blake2b_IV[5];
        v[14] = S->f[0] ^ blake2b_IV[6];
        v[15] = S->f[1] ^ blake2b_IV[7];
#define G(r,i,a,b,c,d) \
        do { \
            a = a + b + m[blake2b_sigma[r][2*i+0]]; \
            d = rotr64(d ^ a, 32); \
            c = c + d; \
            b = rotr64(b ^ c, 24); \
            a = a + b + m[blake2b_sigma[r][2*i+1]]; \
            d = rotr64(d ^ a, 16); \
            c = c + d; \
            b = rotr64(b ^ c, 63); \
        } while (0)
#define ROUND(r)  \
        do { \
            G(r,0,v[ 0],v[ 4],v[ 8],v[12]); \
            G(r,1,v[ 1],v[ 5],v[ 9],v[13]); \
            G(r,2,v[ 2],v[ 6],v[10],v[14]); \
            G(r,3,v[ 3],v[ 7],v[11],v[15]); \
            G(r,4,v[ 0],v[ 5],v[10],v[15]); \
            G(r,5,v[ 1],v[ 6],v[11],v[12]); \
            G(r,6,v[ 2],v[ 7],v[ 8],v[13]); \
            G(r,7,v[ 3],v[ 4],v[ 9],v[14]); \
        } while (0)
#if defined(OPENSSL_SMALL_FOOTPRINT)
        /* 3x size reduction on x86_64, almost 7x on ARMv8, 9x on ARMv4 */
        for (i = 0; i < 12; i++) {
            ROUND(i);
        }
#else
        ROUND(0);
        ROUND(1);
        ROUND(2);
        ROUND(3);
        ROUND(4);
        ROUND(5);
        ROUND(6);
        ROUND(7);
        ROUND(8);
        ROUND(9);
        ROUND(10);
        ROUND(11);
#endif

        for (i = 0; i < 8; ++i) {
            S->h[i] = v[i] ^= v[i + 8] ^ S->h[i];
        }
#undef G
#undef ROUND
        blocks += increment;
        len -= increment;
    } while (len);
}

/* Absorb the input data into the hash state.  Always returns 1. */
int BLAKE2b_Update(BLAKE2B_CTX *c, const void *data, size_t datalen)
{
    const uint8_t *in = data;
    size_t fill;

    /*
     * Intuitively one would expect intermediate buffer, c->buf, to
     * store incomplete blocks. But in this case we are interested to
     * temporarily stash even complete blocks, because last one in the
     * stream has to be treated in special way, and at this point we
     * don't know if last block in *this* call is last one "ever". This
     * is the reason for why |datalen| is compared as >, and not >=.
     */
    fill = sizeof(c->buf) - c->buflen;
    if (datalen > fill) {
        if (c->buflen) {
            memcpy(c->buf + c->buflen, in, fill); /* Fill buffer */
            blake2b_compress(c, c->buf, BLAKE2B_BLOCKBYTES);
            c->buflen = 0;
            in += fill;
            datalen -= fill;
        }
        if (datalen > BLAKE2B_BLOCKBYTES) {
            size_t stashlen = datalen % BLAKE2B_BLOCKBYTES;
            /*
             * If |datalen| is a multiple of the blocksize, stash
             * last complete block, it can be final one...
             */
            stashlen = stashlen ? stashlen : BLAKE2B_BLOCKBYTES;
            datalen -= stashlen;
            blake2b_compress(c, in, datalen);
            in += datalen;
            datalen = stashlen;
        }
    }

    assert(datalen <= BLAKE2B_BLOCKBYTES);

    memcpy(c->buf + c->buflen, in, datalen);
    c->buflen += datalen; /* Be lazy, do not compress */

    return 1;
}

/*
 * Calculate the final hash and save it in md.
 * Always returns 1.
 */
int BLAKE2b_Final(unsigned char *md, BLAKE2B_CTX *c)
{
    int i;

    blake2b_set_lastblock(c);
    /* Padding */
    memset(c->buf + c->buflen, 0, sizeof(c->buf) - c->buflen);
    blake2b_compress(c, c->buf, c->buflen);

    /* Output full hash to message digest */
    for (i = 0; i < 8; ++i) {
        store64(md + sizeof(c->h[i]) * i, c->h[i]);
    }

    OPENSSL_cleanse(c, sizeof(BLAKE2B_CTX));
    return 1;
}