2 * Copyright 2012, Samuel Neves <sneves@dei.uc.pt>.
3 * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
5 * Licensed under the OpenSSL licenses, (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 * https://www.openssl.org/source/license.html
9 * or in the file LICENSE in the source distribution.
13 * Derived from the BLAKE2 reference implementation written by Samuel Neves.
14 * More information about the BLAKE2 hash function and its implementations
15 * can be found at https://blake2.net.
19 # undef NDEBUG /* avoid conflicting definitions */
25 #include <openssl/crypto.h>
28 #include "blake2_locl.h"
29 #include "blake2_impl.h"
31 static const uint64_t blake2b_IV[8] =
33 0x6a09e667f3bcc908U, 0xbb67ae8584caa73bU,
34 0x3c6ef372fe94f82bU, 0xa54ff53a5f1d36f1U,
35 0x510e527fade682d1U, 0x9b05688c2b3e6c1fU,
36 0x1f83d9abfb41bd6bU, 0x5be0cd19137e2179U
39 static const uint8_t blake2b_sigma[12][16] =
41 { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 } ,
42 { 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 } ,
43 { 11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4 } ,
44 { 7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8 } ,
45 { 9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13 } ,
46 { 2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9 } ,
47 { 12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11 } ,
48 { 13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10 } ,
49 { 6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5 } ,
50 { 10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13 , 0 } ,
51 { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 } ,
52 { 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 }
55 /* Set that it's the last block we'll compress */
56 static ossl_inline void blake2b_set_lastblock(BLAKE2B_CTX *S)
61 /* Initialize the hashing state. */
62 static ossl_inline void blake2b_init0(BLAKE2B_CTX *S)
66 memset(S, 0, sizeof(BLAKE2B_CTX));
67 for (i = 0; i < 8; ++i) {
68 S->h[i] = blake2b_IV[i];
72 /* init xors IV with input parameter block */
73 static void blake2b_init_param(BLAKE2B_CTX *S, const BLAKE2B_PARAM *P)
76 const uint8_t *p = (const uint8_t *)(P);
79 /* The param struct is carefully hand packed, and should be 64 bytes on
81 OPENSSL_assert(sizeof(BLAKE2B_PARAM) == 64);
82 /* IV XOR ParamBlock */
83 for (i = 0; i < 8; ++i) {
84 S->h[i] ^= load64(p + sizeof(S->h[i]) * i);
88 /* Initialize the hashing context. Always returns 1. */
89 int BLAKE2b_Init(BLAKE2B_CTX *c)
92 P->digest_length = BLAKE2B_DIGEST_LENGTH;
96 store32(P->leaf_length, 0);
97 store64(P->node_offset, 0);
100 memset(P->reserved, 0, sizeof(P->reserved));
101 memset(P->salt, 0, sizeof(P->salt));
102 memset(P->personal, 0, sizeof(P->personal));
103 blake2b_init_param(c, P);
107 /* Permute the state while xoring in the block of data. */
108 static void blake2b_compress(BLAKE2B_CTX *S,
109 const uint8_t *blocks,
118 * There are two distinct usage vectors for this function:
120 * a) BLAKE2b_Update uses it to process complete blocks,
121 * possibly more than one at a time;
123 * b) BLAK2b_Final uses it to process last block, always
124 * single but possibly incomplete, in which case caller
125 * pads input with zeros.
127 assert(len < BLAKE2B_BLOCKBYTES || len % BLAKE2B_BLOCKBYTES == 0);
130 * Since last block is always processed with separate call,
131 * |len| not being multiple of complete blocks can be observed
132 * only with |len| being less than BLAKE2B_BLOCKBYTES ("less"
133 * including even zero), which is why following assignment doesn't
134 * have to reside inside the main loop below.
136 increment = len < BLAKE2B_BLOCKBYTES ? len : BLAKE2B_BLOCKBYTES;
138 for (i = 0; i < 8; ++i) {
143 for (i = 0; i < 16; ++i) {
144 m[i] = load64(blocks + i * sizeof(m[i]));
147 /* blake2b_increment_counter */
148 S->t[0] += increment;
149 S->t[1] += (S->t[0] < increment);
151 v[8] = blake2b_IV[0];
152 v[9] = blake2b_IV[1];
153 v[10] = blake2b_IV[2];
154 v[11] = blake2b_IV[3];
155 v[12] = S->t[0] ^ blake2b_IV[4];
156 v[13] = S->t[1] ^ blake2b_IV[5];
157 v[14] = S->f[0] ^ blake2b_IV[6];
158 v[15] = S->f[1] ^ blake2b_IV[7];
159 #define G(r,i,a,b,c,d) \
161 a = a + b + m[blake2b_sigma[r][2*i+0]]; \
162 d = rotr64(d ^ a, 32); \
164 b = rotr64(b ^ c, 24); \
165 a = a + b + m[blake2b_sigma[r][2*i+1]]; \
166 d = rotr64(d ^ a, 16); \
168 b = rotr64(b ^ c, 63); \
172 G(r,0,v[ 0],v[ 4],v[ 8],v[12]); \
173 G(r,1,v[ 1],v[ 5],v[ 9],v[13]); \
174 G(r,2,v[ 2],v[ 6],v[10],v[14]); \
175 G(r,3,v[ 3],v[ 7],v[11],v[15]); \
176 G(r,4,v[ 0],v[ 5],v[10],v[15]); \
177 G(r,5,v[ 1],v[ 6],v[11],v[12]); \
178 G(r,6,v[ 2],v[ 7],v[ 8],v[13]); \
179 G(r,7,v[ 3],v[ 4],v[ 9],v[14]); \
181 #if defined(OPENSSL_SMALL_FOOTPRINT)
182 /* 3x size reduction on x86_64, almost 7x on ARMv8, 9x on ARMv4 */
183 for (i = 0; i < 12; i++) {
201 for (i = 0; i < 8; ++i) {
202 S->h[i] = v[i] ^= v[i + 8] ^ S->h[i];
211 /* Absorb the input data into the hash state. Always returns 1. */
212 int BLAKE2b_Update(BLAKE2B_CTX *c, const void *data, size_t datalen)
214 const uint8_t *in = data;
218 * Intuitively one would expect intermediate buffer, c->buf, to
219 * store incomplete blocks. But in this case we are interested to
220 * temporarily stash even complete blocks, because last one in the
221 * stream has to be treated in special way, and at this point we
222 * don't know if last block in *this* call is last one "ever". This
223 * is the reason for why |datalen| is compared as >, and not >=.
225 fill = sizeof(c->buf) - c->buflen;
226 if (datalen > fill) {
228 memcpy(c->buf + c->buflen, in, fill); /* Fill buffer */
229 blake2b_compress(c, c->buf, BLAKE2B_BLOCKBYTES);
234 if (datalen > BLAKE2B_BLOCKBYTES) {
235 size_t stashlen = datalen % BLAKE2B_BLOCKBYTES;
237 * If |datalen| is a multiple of the blocksize, stash
238 * last complete block, it can be final one...
240 stashlen = stashlen ? stashlen : BLAKE2B_BLOCKBYTES;
242 blake2b_compress(c, in, datalen);
248 assert(datalen <= BLAKE2B_BLOCKBYTES);
250 memcpy(c->buf + c->buflen, in, datalen);
251 c->buflen += datalen; /* Be lazy, do not compress */
257 * Calculate the final hash and save it in md.
260 int BLAKE2b_Final(unsigned char *md, BLAKE2B_CTX *c)
264 blake2b_set_lastblock(c);
266 memset(c->buf + c->buflen, 0, sizeof(c->buf) - c->buflen);
267 blake2b_compress(c, c->buf, c->buflen);
269 /* Output full hash to message digest */
270 for (i = 0; i < 8; ++i) {
271 store64(md + sizeof(c->h[i]) * i, c->h[i]);
274 OPENSSL_cleanse(c, sizeof(BLAKE2B_CTX));