2 * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
11 * Derived from the BLAKE2 reference implementation written by Samuel Neves.
12 * Copyright 2012, Samuel Neves <sneves@dei.uc.pt>
13 * More information about the BLAKE2 hash function and its implementations
14 * can be found at https://blake2.net.
19 #include <openssl/crypto.h>
22 #include "blake2_locl.h"
23 #include "blake2_impl.h"
25 static const uint32_t blake2s_IV[8] =
27 0x6A09E667U, 0xBB67AE85U, 0x3C6EF372U, 0xA54FF53AU,
28 0x510E527FU, 0x9B05688CU, 0x1F83D9ABU, 0x5BE0CD19U
31 static const uint8_t blake2s_sigma[10][16] =
33 { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 } ,
34 { 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 } ,
35 { 11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4 } ,
36 { 7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8 } ,
37 { 9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13 } ,
38 { 2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9 } ,
39 { 12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11 } ,
40 { 13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10 } ,
41 { 6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5 } ,
42 { 10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13 , 0 } ,
45 /* Set that it's the last block we'll compress */
46 static ossl_inline void blake2s_set_lastblock(BLAKE2S_CTX *S)
51 /* Initialize the hashing state. */
52 static ossl_inline void blake2s_init0(BLAKE2S_CTX *S)
56 memset(S, 0, sizeof(BLAKE2S_CTX));
57 for (i = 0; i < 8; ++i) {
58 S->h[i] = blake2s_IV[i];
62 /* init2 xors IV with input parameter block */
63 static void blake2s_init_param(BLAKE2S_CTX *S, const BLAKE2S_PARAM *P)
65 const uint8_t *p = (const uint8_t *)(P);
68 /* The param struct is carefully hand packed, and should be 32 bytes on
70 assert(sizeof(BLAKE2S_PARAM) == 32);
72 /* IV XOR ParamBlock */
73 for (i = 0; i < 8; ++i) {
74 S->h[i] ^= load32(&p[i*4]);
78 /* Initialize the hashing context. Always returns 1. */
79 int BLAKE2s_Init(BLAKE2S_CTX *c)
83 P->digest_length = BLAKE2S_DIGEST_LENGTH;
87 store32(P->leaf_length, 0);
88 store48(P->node_offset, 0);
91 memset(P->salt, 0, sizeof(P->salt));
92 memset(P->personal, 0, sizeof(P->personal));
93 blake2s_init_param(c, P);
97 /* Permute the state while xoring in the block of data. */
98 static void blake2s_compress(BLAKE2S_CTX *S,
99 const uint8_t *blocks,
108 * There are two distinct usage vectors for this function:
110 * a) BLAKE2s_Update uses it to process complete blocks,
111 * possibly more than one at a time;
113 * b) BLAK2s_Final uses it to process last block, always
114 * single but possibly incomplete, in which case caller
115 * pads input with zeros.
117 assert(len < BLAKE2S_BLOCKBYTES || len % BLAKE2S_BLOCKBYTES == 0);
120 * Since last block is always processed with separate call,
121 * |len| not being multiple of complete blocks can be observed
122 * only with |len| being less than BLAKE2S_BLOCKBYTES ("less"
123 * including even zero), which is why following assignment doesn't
124 * have to reside inside the main loop below.
126 increment = len < BLAKE2S_BLOCKBYTES ? len : BLAKE2S_BLOCKBYTES;
128 for (i = 0; i < 8; ++i) {
133 for (i = 0; i < 16; ++i) {
134 m[i] = load32(blocks + i * sizeof(m[i]));
137 /* blake2s_increment_counter */
138 S->t[0] += increment;
139 S->t[1] += (S->t[0] < increment);
141 v[ 8] = blake2s_IV[0];
142 v[ 9] = blake2s_IV[1];
143 v[10] = blake2s_IV[2];
144 v[11] = blake2s_IV[3];
145 v[12] = S->t[0] ^ blake2s_IV[4];
146 v[13] = S->t[1] ^ blake2s_IV[5];
147 v[14] = S->f[0] ^ blake2s_IV[6];
148 v[15] = S->f[1] ^ blake2s_IV[7];
149 #define G(r,i,a,b,c,d) \
151 a = a + b + m[blake2s_sigma[r][2*i+0]]; \
152 d = rotr32(d ^ a, 16); \
154 b = rotr32(b ^ c, 12); \
155 a = a + b + m[blake2s_sigma[r][2*i+1]]; \
156 d = rotr32(d ^ a, 8); \
158 b = rotr32(b ^ c, 7); \
162 G(r,0,v[ 0],v[ 4],v[ 8],v[12]); \
163 G(r,1,v[ 1],v[ 5],v[ 9],v[13]); \
164 G(r,2,v[ 2],v[ 6],v[10],v[14]); \
165 G(r,3,v[ 3],v[ 7],v[11],v[15]); \
166 G(r,4,v[ 0],v[ 5],v[10],v[15]); \
167 G(r,5,v[ 1],v[ 6],v[11],v[12]); \
168 G(r,6,v[ 2],v[ 7],v[ 8],v[13]); \
169 G(r,7,v[ 3],v[ 4],v[ 9],v[14]); \
171 #if defined(OPENSSL_SMALL_FOOTPRINT)
172 /* almost 3x reduction on x86_64, 4.5x on ARMv8, 4x on ARMv4 */
173 for (i = 0; i < 10; i++) {
189 for (i = 0; i < 8; ++i) {
190 S->h[i] = v[i] ^= v[i + 8] ^ S->h[i];
199 /* Absorb the input data into the hash state. Always returns 1. */
200 int BLAKE2s_Update(BLAKE2S_CTX *c, const void *data, size_t datalen)
202 const uint8_t *in = data;
206 * Intuitively one would expect intermediate buffer, c->buf, to
207 * store incomplete blocks. But in this case we are interested to
208 * temporarily stash even complete blocks, because last one in the
209 * stream has to be treated in special way, and at this point we
210 * don't know if last block in *this* call is last one "ever". This
211 * is the reason for why |datalen| is compared as >, and not >=.
213 fill = sizeof(c->buf) - c->buflen;
214 if (datalen > fill) {
216 memcpy(c->buf + c->buflen, in, fill); /* Fill buffer */
217 blake2s_compress(c, c->buf, BLAKE2S_BLOCKBYTES);
222 if (datalen > BLAKE2S_BLOCKBYTES) {
223 size_t stashlen = datalen % BLAKE2S_BLOCKBYTES;
225 * If |datalen| is a multiple of the blocksize, stash
226 * last complete block, it can be final one...
228 stashlen = stashlen ? stashlen : BLAKE2S_BLOCKBYTES;
230 blake2s_compress(c, in, datalen);
236 assert(datalen <= BLAKE2S_BLOCKBYTES);
238 memcpy(c->buf + c->buflen, in, datalen);
239 c->buflen += datalen; /* Be lazy, do not compress */
245 * Calculate the final hash and save it in md.
248 int BLAKE2s_Final(unsigned char *md, BLAKE2S_CTX *c)
252 blake2s_set_lastblock(c);
254 memset(c->buf + c->buflen, 0, sizeof(c->buf) - c->buflen);
255 blake2s_compress(c, c->buf, c->buflen);
257 /* Output full hash to temp buffer */
258 for (i = 0; i < 8; ++i) {
259 store32(md + sizeof(c->h[i]) * i, c->h[i]);
262 OPENSSL_cleanse(c, sizeof(BLAKE2S_CTX));