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.
20 #include <openssl/crypto.h>
23 #include "blake2_locl.h"
24 #include "blake2_impl.h"
26 static const uint32_t blake2s_IV[8] =
28 0x6A09E667U, 0xBB67AE85U, 0x3C6EF372U, 0xA54FF53AU,
29 0x510E527FU, 0x9B05688CU, 0x1F83D9ABU, 0x5BE0CD19U
32 static const uint8_t blake2s_sigma[10][16] =
34 { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 } ,
35 { 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 } ,
36 { 11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4 } ,
37 { 7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8 } ,
38 { 9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13 } ,
39 { 2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9 } ,
40 { 12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11 } ,
41 { 13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10 } ,
42 { 6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5 } ,
43 { 10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13 , 0 } ,
46 /* Set that it's the last block we'll compress */
47 static ossl_inline void blake2s_set_lastblock(BLAKE2S_CTX *S)
52 /* Initialize the hashing state. */
53 static ossl_inline void blake2s_init0(BLAKE2S_CTX *S)
57 memset(S, 0, sizeof(BLAKE2S_CTX));
58 for (i = 0; i < 8; ++i) {
59 S->h[i] = blake2s_IV[i];
63 /* init2 xors IV with input parameter block */
64 static void blake2s_init_param(BLAKE2S_CTX *S, const BLAKE2S_PARAM *P)
66 const uint8_t *p = (const uint8_t *)(P);
69 /* The param struct is carefully hand packed, and should be 32 bytes on
71 assert(sizeof(BLAKE2S_PARAM) == 32);
73 /* IV XOR ParamBlock */
74 for (i = 0; i < 8; ++i) {
75 S->h[i] ^= load32(&p[i*4]);
79 /* Initialize the hashing context. Always returns 1. */
80 int BLAKE2s_Init(BLAKE2S_CTX *c)
84 P->digest_length = BLAKE2S_DIGEST_LENGTH;
88 store32(P->leaf_length, 0);
89 store48(P->node_offset, 0);
92 memset(P->salt, 0, sizeof(P->salt));
93 memset(P->personal, 0, sizeof(P->personal));
94 blake2s_init_param(c, P);
98 /* Permute the state while xoring in the block of data. */
99 static void blake2s_compress(BLAKE2S_CTX *S,
100 const uint8_t *blocks,
109 * There are two distinct usage vectors for this function:
111 * a) BLAKE2s_Update uses it to process complete blocks,
112 * possibly more than one at a time;
114 * b) BLAK2s_Final uses it to process last block, always
115 * single but possibly incomplete, in which case caller
116 * pads input with zeros.
118 assert(len < BLAKE2S_BLOCKBYTES || len % BLAKE2S_BLOCKBYTES == 0);
121 * Since last block is always processed with separate call,
122 * |len| not being multiple of complete blocks can be observed
123 * only with |len| being less than BLAKE2S_BLOCKBYTES ("less"
124 * including even zero), which is why following assignment doesn't
125 * have to reside inside the main loop below.
127 increment = len < BLAKE2S_BLOCKBYTES ? len : BLAKE2S_BLOCKBYTES;
129 for (i = 0; i < 8; ++i) {
134 for (i = 0; i < 16; ++i) {
135 m[i] = load32(blocks + i * sizeof(m[i]));
138 /* blake2s_increment_counter */
139 S->t[0] += increment;
140 S->t[1] += (S->t[0] < increment);
142 v[ 8] = blake2s_IV[0];
143 v[ 9] = blake2s_IV[1];
144 v[10] = blake2s_IV[2];
145 v[11] = blake2s_IV[3];
146 v[12] = S->t[0] ^ blake2s_IV[4];
147 v[13] = S->t[1] ^ blake2s_IV[5];
148 v[14] = S->f[0] ^ blake2s_IV[6];
149 v[15] = S->f[1] ^ blake2s_IV[7];
150 #define G(r,i,a,b,c,d) \
152 a = a + b + m[blake2s_sigma[r][2*i+0]]; \
153 d = rotr32(d ^ a, 16); \
155 b = rotr32(b ^ c, 12); \
156 a = a + b + m[blake2s_sigma[r][2*i+1]]; \
157 d = rotr32(d ^ a, 8); \
159 b = rotr32(b ^ c, 7); \
163 G(r,0,v[ 0],v[ 4],v[ 8],v[12]); \
164 G(r,1,v[ 1],v[ 5],v[ 9],v[13]); \
165 G(r,2,v[ 2],v[ 6],v[10],v[14]); \
166 G(r,3,v[ 3],v[ 7],v[11],v[15]); \
167 G(r,4,v[ 0],v[ 5],v[10],v[15]); \
168 G(r,5,v[ 1],v[ 6],v[11],v[12]); \
169 G(r,6,v[ 2],v[ 7],v[ 8],v[13]); \
170 G(r,7,v[ 3],v[ 4],v[ 9],v[14]); \
172 #if defined(OPENSSL_SMALL_FOOTPRINT)
173 /* almost 3x reduction on x86_64, 4.5x on ARMv8, 4x on ARMv4 */
174 for (i = 0; i < 10; i++) {
190 for (i = 0; i < 8; ++i) {
191 S->h[i] = v[i] ^= v[i + 8] ^ S->h[i];
200 /* Absorb the input data into the hash state. Always returns 1. */
201 int BLAKE2s_Update(BLAKE2S_CTX *c, const void *data, size_t datalen)
203 const uint8_t *in = data;
207 * Intuitively one would expect intermediate buffer, c->buf, to
208 * store incomplete blocks. But in this case we are interested to
209 * temporarily stash even complete blocks, because last one in the
210 * stream has to be treated in special way, and at this point we
211 * don't know if last block in *this* call is last one "ever". This
212 * is the reason for why |datalen| is compared as >, and not >=.
214 fill = sizeof(c->buf) - c->buflen;
215 if (datalen > fill) {
217 memcpy(c->buf + c->buflen, in, fill); /* Fill buffer */
218 blake2s_compress(c, c->buf, BLAKE2S_BLOCKBYTES);
223 if (datalen > BLAKE2S_BLOCKBYTES) {
224 size_t stashlen = datalen % BLAKE2S_BLOCKBYTES;
226 * If |datalen| is a multiple of the blocksize, stash
227 * last complete block, it can be final one...
229 stashlen = stashlen ? stashlen : BLAKE2S_BLOCKBYTES;
231 blake2s_compress(c, in, datalen);
237 assert(datalen <= BLAKE2S_BLOCKBYTES);
239 memcpy(c->buf + c->buflen, in, datalen);
240 c->buflen += datalen; /* Be lazy, do not compress */
246 * Calculate the final hash and save it in md.
249 int BLAKE2s_Final(unsigned char *md, BLAKE2S_CTX *c)
253 blake2s_set_lastblock(c);
255 memset(c->buf + c->buflen, 0, sizeof(c->buf) - c->buflen);
256 blake2s_compress(c, c->buf, c->buflen);
258 /* Output full hash to temp buffer */
259 for (i = 0; i < 8; ++i) {
260 store32(md + sizeof(c->h[i]) * i, c->h[i]);
263 OPENSSL_cleanse(c, sizeof(BLAKE2S_CTX));