2 * Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (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>
21 #include "blake2_locl.h"
22 #include "blake2_impl.h"
24 static const uint32_t blake2s_IV[8] =
26 0x6A09E667U, 0xBB67AE85U, 0x3C6EF372U, 0xA54FF53AU,
27 0x510E527FU, 0x9B05688CU, 0x1F83D9ABU, 0x5BE0CD19U
30 static const uint8_t blake2s_sigma[10][16] =
32 { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 } ,
33 { 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 } ,
34 { 11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4 } ,
35 { 7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8 } ,
36 { 9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13 } ,
37 { 2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9 } ,
38 { 12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11 } ,
39 { 13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10 } ,
40 { 6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5 } ,
41 { 10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13 , 0 } ,
44 /* Set that it's the last block we'll compress */
45 static ossl_inline void blake2s_set_lastblock(BLAKE2S_CTX *S)
50 /* Initialize the hashing state. */
51 static ossl_inline void blake2s_init0(BLAKE2S_CTX *S)
55 memset(S, 0, sizeof(BLAKE2S_CTX));
56 for (i = 0; i < 8; ++i) {
57 S->h[i] = blake2s_IV[i];
61 /* init xors IV with input parameter block and sets the output length */
62 static void blake2s_init_param(BLAKE2S_CTX *S, const BLAKE2S_PARAM *P)
65 const uint8_t *p = (const uint8_t *)(P);
68 S->outlen = P->digest_length;
70 /* The param struct is carefully hand packed, and should be 32 bytes on
72 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 void blake2s_param_init(BLAKE2S_PARAM *P)
81 P->digest_length = BLAKE2S_DIGEST_LENGTH;
85 store32(P->leaf_length, 0);
86 store48(P->node_offset, 0);
89 memset(P->salt, 0, sizeof(P->salt));
90 memset(P->personal, 0, sizeof(P->personal));
93 void blake2s_param_set_digest_length(BLAKE2S_PARAM *P, uint8_t outlen)
95 P->digest_length = outlen;
98 void blake2s_param_set_key_length(BLAKE2S_PARAM *P, uint8_t keylen)
100 P->key_length = keylen;
103 void blake2s_param_set_personal(BLAKE2S_PARAM *P, const uint8_t *personal, size_t len)
105 memcpy(P->personal, personal, len);
106 memset(P->personal + len, 0, BLAKE2S_PERSONALBYTES - len);
109 void blake2s_param_set_salt(BLAKE2S_PARAM *P, const uint8_t *salt, size_t len)
111 memcpy(P->salt, salt, len);
112 memset(P->salt + len, 0, BLAKE2S_SALTBYTES - len);}
115 * Initialize the hashing context with the given parameter block.
118 int BLAKE2s_Init(BLAKE2S_CTX *c, const BLAKE2S_PARAM *P)
120 blake2s_init_param(c, P);
125 * Initialize the hashing context with the given parameter block and key.
128 int BLAKE2s_Init_key(BLAKE2S_CTX *c, const BLAKE2S_PARAM *P, const void *key)
130 blake2s_init_param(c, P);
132 /* Pad the key to form first data block */
134 uint8_t block[BLAKE2S_BLOCKBYTES] = {0};
136 memcpy(block, key, P->key_length);
137 BLAKE2s_Update(c, block, BLAKE2S_BLOCKBYTES);
138 OPENSSL_cleanse(block, BLAKE2S_BLOCKBYTES);
144 /* Permute the state while xoring in the block of data. */
145 static void blake2s_compress(BLAKE2S_CTX *S,
146 const uint8_t *blocks,
155 * There are two distinct usage vectors for this function:
157 * a) BLAKE2s_Update uses it to process complete blocks,
158 * possibly more than one at a time;
160 * b) BLAK2s_Final uses it to process last block, always
161 * single but possibly incomplete, in which case caller
162 * pads input with zeros.
164 assert(len < BLAKE2S_BLOCKBYTES || len % BLAKE2S_BLOCKBYTES == 0);
167 * Since last block is always processed with separate call,
168 * |len| not being multiple of complete blocks can be observed
169 * only with |len| being less than BLAKE2S_BLOCKBYTES ("less"
170 * including even zero), which is why following assignment doesn't
171 * have to reside inside the main loop below.
173 increment = len < BLAKE2S_BLOCKBYTES ? len : BLAKE2S_BLOCKBYTES;
175 for (i = 0; i < 8; ++i) {
180 for (i = 0; i < 16; ++i) {
181 m[i] = load32(blocks + i * sizeof(m[i]));
184 /* blake2s_increment_counter */
185 S->t[0] += increment;
186 S->t[1] += (S->t[0] < increment);
188 v[ 8] = blake2s_IV[0];
189 v[ 9] = blake2s_IV[1];
190 v[10] = blake2s_IV[2];
191 v[11] = blake2s_IV[3];
192 v[12] = S->t[0] ^ blake2s_IV[4];
193 v[13] = S->t[1] ^ blake2s_IV[5];
194 v[14] = S->f[0] ^ blake2s_IV[6];
195 v[15] = S->f[1] ^ blake2s_IV[7];
196 #define G(r,i,a,b,c,d) \
198 a = a + b + m[blake2s_sigma[r][2*i+0]]; \
199 d = rotr32(d ^ a, 16); \
201 b = rotr32(b ^ c, 12); \
202 a = a + b + m[blake2s_sigma[r][2*i+1]]; \
203 d = rotr32(d ^ a, 8); \
205 b = rotr32(b ^ c, 7); \
209 G(r,0,v[ 0],v[ 4],v[ 8],v[12]); \
210 G(r,1,v[ 1],v[ 5],v[ 9],v[13]); \
211 G(r,2,v[ 2],v[ 6],v[10],v[14]); \
212 G(r,3,v[ 3],v[ 7],v[11],v[15]); \
213 G(r,4,v[ 0],v[ 5],v[10],v[15]); \
214 G(r,5,v[ 1],v[ 6],v[11],v[12]); \
215 G(r,6,v[ 2],v[ 7],v[ 8],v[13]); \
216 G(r,7,v[ 3],v[ 4],v[ 9],v[14]); \
218 #if defined(OPENSSL_SMALL_FOOTPRINT)
219 /* almost 3x reduction on x86_64, 4.5x on ARMv8, 4x on ARMv4 */
220 for (i = 0; i < 10; i++) {
236 for (i = 0; i < 8; ++i) {
237 S->h[i] = v[i] ^= v[i + 8] ^ S->h[i];
246 /* Absorb the input data into the hash state. Always returns 1. */
247 int BLAKE2s_Update(BLAKE2S_CTX *c, const void *data, size_t datalen)
249 const uint8_t *in = data;
253 * Intuitively one would expect intermediate buffer, c->buf, to
254 * store incomplete blocks. But in this case we are interested to
255 * temporarily stash even complete blocks, because last one in the
256 * stream has to be treated in special way, and at this point we
257 * don't know if last block in *this* call is last one "ever". This
258 * is the reason for why |datalen| is compared as >, and not >=.
260 fill = sizeof(c->buf) - c->buflen;
261 if (datalen > fill) {
263 memcpy(c->buf + c->buflen, in, fill); /* Fill buffer */
264 blake2s_compress(c, c->buf, BLAKE2S_BLOCKBYTES);
269 if (datalen > BLAKE2S_BLOCKBYTES) {
270 size_t stashlen = datalen % BLAKE2S_BLOCKBYTES;
272 * If |datalen| is a multiple of the blocksize, stash
273 * last complete block, it can be final one...
275 stashlen = stashlen ? stashlen : BLAKE2S_BLOCKBYTES;
277 blake2s_compress(c, in, datalen);
283 assert(datalen <= BLAKE2S_BLOCKBYTES);
285 memcpy(c->buf + c->buflen, in, datalen);
286 c->buflen += datalen; /* Be lazy, do not compress */
292 * Calculate the final hash and save it in md.
295 int BLAKE2s_Final(unsigned char *md, BLAKE2S_CTX *c)
297 uint8_t outbuffer[BLAKE2S_OUTBYTES] = {0};
300 blake2s_set_lastblock(c);
302 memset(c->buf + c->buflen, 0, sizeof(c->buf) - c->buflen);
303 blake2s_compress(c, c->buf, c->buflen);
305 /* Output full hash to temp buffer */
306 for (i = 0; i < 8; ++i) {
307 store32(outbuffer + sizeof(c->h[i]) * i, c->h[i]);
310 memcpy(md, outbuffer, c->outlen);
311 OPENSSL_cleanse(c, sizeof(BLAKE2S_CTX));