2 * Copyright 2016-2023 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>
20 #include <openssl/core_names.h>
21 #include <openssl/proverr.h>
22 #include <openssl/err.h>
23 #include "blake2_impl.h"
24 #include "prov/blake2.h"
26 static const OSSL_PARAM known_blake2b_settable_ctx_params[] = {
27 {OSSL_DIGEST_PARAM_XOFLEN, OSSL_PARAM_UNSIGNED_INTEGER, NULL, 0, 0},
31 const OSSL_PARAM *ossl_blake2b_settable_ctx_params(ossl_unused void *ctx,
32 ossl_unused void *pctx)
34 return known_blake2b_settable_ctx_params;
37 int ossl_blake2b_set_ctx_params(void *vctx, const OSSL_PARAM params[])
40 struct blake2b_md_data_st *mdctx = vctx;
43 BLAKE2B_CTX *ctx = &mdctx->ctx;
50 p = OSSL_PARAM_locate_const(params, OSSL_DIGEST_PARAM_XOFLEN);
52 if (!OSSL_PARAM_get_size_t(p, &xoflen)) {
53 ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
56 ossl_blake2b_param_set_digest_length(&mdctx->params, (uint8_t)xoflen);
62 static const uint64_t blake2b_IV[8] =
64 0x6a09e667f3bcc908ULL, 0xbb67ae8584caa73bULL,
65 0x3c6ef372fe94f82bULL, 0xa54ff53a5f1d36f1ULL,
66 0x510e527fade682d1ULL, 0x9b05688c2b3e6c1fULL,
67 0x1f83d9abfb41bd6bULL, 0x5be0cd19137e2179ULL
70 static const uint8_t blake2b_sigma[12][16] =
72 { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 } ,
73 { 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 } ,
74 { 11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4 } ,
75 { 7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8 } ,
76 { 9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13 } ,
77 { 2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9 } ,
78 { 12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11 } ,
79 { 13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10 } ,
80 { 6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5 } ,
81 { 10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13 , 0 } ,
82 { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 } ,
83 { 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 }
86 /* Set that it's the last block we'll compress */
87 static ossl_inline void blake2b_set_lastblock(BLAKE2B_CTX *S)
92 /* Initialize the hashing state. */
93 static ossl_inline void blake2b_init0(BLAKE2B_CTX *S)
97 memset(S, 0, sizeof(BLAKE2B_CTX));
98 for (i = 0; i < 8; ++i) {
99 S->h[i] = blake2b_IV[i];
103 /* init xors IV with input parameter block and sets the output length */
104 static void blake2b_init_param(BLAKE2B_CTX *S, const BLAKE2B_PARAM *P)
107 const uint8_t *p = (const uint8_t *)(P);
110 S->outlen = P->digest_length;
112 /* The param struct is carefully hand packed, and should be 64 bytes on
114 assert(sizeof(BLAKE2B_PARAM) == 64);
115 /* IV XOR ParamBlock */
116 for (i = 0; i < 8; ++i) {
117 S->h[i] ^= load64(p + sizeof(S->h[i]) * i);
121 /* Initialize the parameter block with default values */
122 void ossl_blake2b_param_init(BLAKE2B_PARAM *P)
124 P->digest_length = BLAKE2B_DIGEST_LENGTH;
128 store32(P->leaf_length, 0);
129 store64(P->node_offset, 0);
132 memset(P->reserved, 0, sizeof(P->reserved));
133 memset(P->salt, 0, sizeof(P->salt));
134 memset(P->personal, 0, sizeof(P->personal));
137 void ossl_blake2b_param_set_digest_length(BLAKE2B_PARAM *P, uint8_t outlen)
139 P->digest_length = outlen;
142 void ossl_blake2b_param_set_key_length(BLAKE2B_PARAM *P, uint8_t keylen)
144 P->key_length = keylen;
147 void ossl_blake2b_param_set_personal(BLAKE2B_PARAM *P, const uint8_t *personal,
150 memcpy(P->personal, personal, len);
151 memset(P->personal + len, 0, BLAKE2B_PERSONALBYTES - len);
154 void ossl_blake2b_param_set_salt(BLAKE2B_PARAM *P, const uint8_t *salt,
157 memcpy(P->salt, salt, len);
158 memset(P->salt + len, 0, BLAKE2B_SALTBYTES - len);
162 * Initialize the hashing context with the given parameter block.
165 int ossl_blake2b_init(BLAKE2B_CTX *c, const BLAKE2B_PARAM *P)
167 blake2b_init_param(c, P);
172 * Initialize the hashing context with the given parameter block and key.
175 int ossl_blake2b_init_key(BLAKE2B_CTX *c, const BLAKE2B_PARAM *P,
178 blake2b_init_param(c, P);
180 /* Pad the key to form first data block */
182 uint8_t block[BLAKE2B_BLOCKBYTES] = {0};
184 memcpy(block, key, P->key_length);
185 ossl_blake2b_update(c, block, BLAKE2B_BLOCKBYTES);
186 OPENSSL_cleanse(block, BLAKE2B_BLOCKBYTES);
192 /* Permute the state while xoring in the block of data. */
193 static void blake2b_compress(BLAKE2B_CTX *S,
194 const uint8_t *blocks,
203 * There are two distinct usage vectors for this function:
205 * a) BLAKE2b_Update uses it to process complete blocks,
206 * possibly more than one at a time;
208 * b) BLAK2b_Final uses it to process last block, always
209 * single but possibly incomplete, in which case caller
210 * pads input with zeros.
212 assert(len < BLAKE2B_BLOCKBYTES || len % BLAKE2B_BLOCKBYTES == 0);
215 * Since last block is always processed with separate call,
216 * |len| not being multiple of complete blocks can be observed
217 * only with |len| being less than BLAKE2B_BLOCKBYTES ("less"
218 * including even zero), which is why following assignment doesn't
219 * have to reside inside the main loop below.
221 increment = len < BLAKE2B_BLOCKBYTES ? len : BLAKE2B_BLOCKBYTES;
223 for (i = 0; i < 8; ++i) {
228 for (i = 0; i < 16; ++i) {
229 m[i] = load64(blocks + i * sizeof(m[i]));
232 /* blake2b_increment_counter */
233 S->t[0] += increment;
234 S->t[1] += (S->t[0] < increment);
236 v[8] = blake2b_IV[0];
237 v[9] = blake2b_IV[1];
238 v[10] = blake2b_IV[2];
239 v[11] = blake2b_IV[3];
240 v[12] = S->t[0] ^ blake2b_IV[4];
241 v[13] = S->t[1] ^ blake2b_IV[5];
242 v[14] = S->f[0] ^ blake2b_IV[6];
243 v[15] = S->f[1] ^ blake2b_IV[7];
244 #define G(r,i,a,b,c,d) \
246 a = a + b + m[blake2b_sigma[r][2*i+0]]; \
247 d = rotr64(d ^ a, 32); \
249 b = rotr64(b ^ c, 24); \
250 a = a + b + m[blake2b_sigma[r][2*i+1]]; \
251 d = rotr64(d ^ a, 16); \
253 b = rotr64(b ^ c, 63); \
257 G(r,0,v[ 0],v[ 4],v[ 8],v[12]); \
258 G(r,1,v[ 1],v[ 5],v[ 9],v[13]); \
259 G(r,2,v[ 2],v[ 6],v[10],v[14]); \
260 G(r,3,v[ 3],v[ 7],v[11],v[15]); \
261 G(r,4,v[ 0],v[ 5],v[10],v[15]); \
262 G(r,5,v[ 1],v[ 6],v[11],v[12]); \
263 G(r,6,v[ 2],v[ 7],v[ 8],v[13]); \
264 G(r,7,v[ 3],v[ 4],v[ 9],v[14]); \
266 #if defined(OPENSSL_SMALL_FOOTPRINT)
267 /* 3x size reduction on x86_64, almost 7x on ARMv8, 9x on ARMv4 */
268 for (i = 0; i < 12; i++) {
286 for (i = 0; i < 8; ++i) {
287 S->h[i] = v[i] ^= v[i + 8] ^ S->h[i];
296 /* Absorb the input data into the hash state. Always returns 1. */
297 int ossl_blake2b_update(BLAKE2B_CTX *c, const void *data, size_t datalen)
299 const uint8_t *in = data;
303 * Intuitively one would expect intermediate buffer, c->buf, to
304 * store incomplete blocks. But in this case we are interested to
305 * temporarily stash even complete blocks, because last one in the
306 * stream has to be treated in special way, and at this point we
307 * don't know if last block in *this* call is last one "ever". This
308 * is the reason for why |datalen| is compared as >, and not >=.
310 fill = sizeof(c->buf) - c->buflen;
311 if (datalen > fill) {
313 memcpy(c->buf + c->buflen, in, fill); /* Fill buffer */
314 blake2b_compress(c, c->buf, BLAKE2B_BLOCKBYTES);
319 if (datalen > BLAKE2B_BLOCKBYTES) {
320 size_t stashlen = datalen % BLAKE2B_BLOCKBYTES;
322 * If |datalen| is a multiple of the blocksize, stash
323 * last complete block, it can be final one...
325 stashlen = stashlen ? stashlen : BLAKE2B_BLOCKBYTES;
327 blake2b_compress(c, in, datalen);
333 assert(datalen <= BLAKE2B_BLOCKBYTES);
335 memcpy(c->buf + c->buflen, in, datalen);
336 c->buflen += datalen; /* Be lazy, do not compress */
342 * Calculate the final hash and save it in md.
345 int ossl_blake2b_final(unsigned char *md, BLAKE2B_CTX *c)
347 uint8_t outbuffer[BLAKE2B_OUTBYTES] = {0};
348 uint8_t *target = outbuffer;
349 int iter = (c->outlen + 7) / 8;
352 /* Avoid writing to the temporary buffer if possible */
353 if ((c->outlen % sizeof(c->h[0])) == 0)
356 blake2b_set_lastblock(c);
358 memset(c->buf + c->buflen, 0, sizeof(c->buf) - c->buflen);
359 blake2b_compress(c, c->buf, c->buflen);
361 /* Output full hash to buffer */
362 for (i = 0; i < iter; ++i)
363 store64(target + sizeof(c->h[i]) * i, c->h[i]);
366 memcpy(md, target, c->outlen);
368 OPENSSL_cleanse(c, sizeof(BLAKE2B_CTX));