2 * BLAKE2 reference source code package - reference C implementations
4 * Copyright 2012, Samuel Neves <sneves@dei.uc.pt>.
5 * You may use this under the terms of the CC0, the OpenSSL Licence, or the
6 * Apache Public License 2.0, at your option. The terms of these licenses can
9 * - OpenSSL license : https://www.openssl.org/source/license.html
10 * - Apache 2.0 : http://www.apache.org/licenses/LICENSE-2.0
11 * - CC0 1.0 Universal : http://creativecommons.org/publicdomain/zero/1.0
13 * More information about the BLAKE2 hash function can be found at
17 /* crypto/blake2/blake2b.c */
22 #include <openssl/crypto.h>
24 #include "internal/blake2_locl.h"
25 #include "blake2_impl.h"
27 static const uint64_t blake2b_IV[8] =
29 0x6a09e667f3bcc908ULL, 0xbb67ae8584caa73bULL,
30 0x3c6ef372fe94f82bULL, 0xa54ff53a5f1d36f1ULL,
31 0x510e527fade682d1ULL, 0x9b05688c2b3e6c1fULL,
32 0x1f83d9abfb41bd6bULL, 0x5be0cd19137e2179ULL
35 static const uint8_t blake2b_sigma[12][16] =
37 { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 } ,
38 { 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 } ,
39 { 11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4 } ,
40 { 7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8 } ,
41 { 9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13 } ,
42 { 2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9 } ,
43 { 12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11 } ,
44 { 13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10 } ,
45 { 6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5 } ,
46 { 10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13 , 0 } ,
47 { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 } ,
48 { 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 }
51 /* Some helper functions, not necessarily useful */
52 static inline void blake2b_set_lastblock(BLAKE2B_CTX *S)
57 /* Increment the data hashed couter. */
58 static inline void blake2b_increment_counter(BLAKE2B_CTX *S,
62 S->t[1] += (S->t[0] < inc);
65 /* Initialize the hashing state. */
66 static inline void blake2b_init0(BLAKE2B_CTX *S)
69 memset(S, 0, sizeof(BLAKE2B_CTX));
71 for(i = 0; i < 8; ++i) {
72 S->h[i] = blake2b_IV[i];
76 /* init xors IV with input parameter block */
77 static void blake2b_init_param(BLAKE2B_CTX *S, const BLAKE2B_PARAM *P)
80 const uint8_t *p = (const uint8_t *)(P);
83 /* The param struct is carefully hand packed, and should be 64 bytes on
85 OPENSSL_assert(sizeof(BLAKE2B_PARAM) == 64);
86 /* IV XOR ParamBlock */
87 for(i = 0; i < 8; ++i) {
88 S->h[i] ^= load64(p + sizeof(S->h[i]) * i);
92 /* Initialize the hashing context. Always returns 1. */
93 int BLAKE2b_Init(BLAKE2B_CTX *c)
96 P->digest_length = BLAKE2B_DIGEST_LENGTH;
100 store32(&P->leaf_length, 0);
101 store64(&P->node_offset, 0);
104 memset(P->reserved, 0, sizeof(P->reserved));
105 memset(P->salt, 0, sizeof(P->salt));
106 memset(P->personal, 0, sizeof(P->personal));
107 blake2b_init_param(c, P);
111 /* Permute the state while xoring in the block of data. */
112 static void blake2b_compress(BLAKE2B_CTX *S,
113 const uint8_t block[BLAKE2B_BLOCKBYTES])
119 for(i = 0; i < 16; ++i) {
120 m[i] = load64(block + i * sizeof(m[i]));
123 for(i = 0; i < 8; ++i) {
127 v[8] = blake2b_IV[0];
128 v[9] = blake2b_IV[1];
129 v[10] = blake2b_IV[2];
130 v[11] = blake2b_IV[3];
131 v[12] = S->t[0] ^ blake2b_IV[4];
132 v[13] = S->t[1] ^ blake2b_IV[5];
133 v[14] = S->f[0] ^ blake2b_IV[6];
134 v[15] = S->f[1] ^ blake2b_IV[7];
135 #define G(r,i,a,b,c,d) \
137 a = a + b + m[blake2b_sigma[r][2*i+0]]; \
138 d = rotr64(d ^ a, 32); \
140 b = rotr64(b ^ c, 24); \
141 a = a + b + m[blake2b_sigma[r][2*i+1]]; \
142 d = rotr64(d ^ a, 16); \
144 b = rotr64(b ^ c, 63); \
148 G(r,0,v[ 0],v[ 4],v[ 8],v[12]); \
149 G(r,1,v[ 1],v[ 5],v[ 9],v[13]); \
150 G(r,2,v[ 2],v[ 6],v[10],v[14]); \
151 G(r,3,v[ 3],v[ 7],v[11],v[15]); \
152 G(r,4,v[ 0],v[ 5],v[10],v[15]); \
153 G(r,5,v[ 1],v[ 6],v[11],v[12]); \
154 G(r,6,v[ 2],v[ 7],v[ 8],v[13]); \
155 G(r,7,v[ 3],v[ 4],v[ 9],v[14]); \
170 for(i = 0; i < 8; ++i) {
171 S->h[i] = S->h[i] ^ v[i] ^ v[i + 8];
178 /* Absorb the input data into the hash state. Always returns 1. */
179 int BLAKE2b_Update(BLAKE2B_CTX *c, const void *data, size_t datalen)
181 const uint8_t *in = data;
185 fill = sizeof(c->buf) - c->buflen;
186 /* Must be >, not >=, so that last block can be hashed differently */
188 memcpy(c->buf + c->buflen, in, fill); /* Fill buffer */
189 blake2b_increment_counter(c, BLAKE2B_BLOCKBYTES);
190 blake2b_compress(c, c->buf); /* Compress */
194 } else { /* datalen <= fill */
195 memcpy(c->buf + c->buflen, in, datalen);
196 c->buflen += datalen; /* Be lazy, do not compress */
205 * Finalize the hash state in a way that avoids length extension attacks.
208 int BLAKE2b_Final(unsigned char *md, BLAKE2B_CTX *c)
212 blake2b_increment_counter(c, c->buflen);
213 blake2b_set_lastblock(c);
215 memset(c->buf + c->buflen, 0, sizeof(c->buf) - c->buflen);
216 blake2b_compress(c, c->buf);
218 /* Output full hash to message digest */
219 for(i = 0; i < 8; ++i) {
220 store64(md + sizeof(c->h[i]) * i, c->h[i]);
223 OPENSSL_cleanse(c, sizeof(BLAKE2B_CTX));