1 /* Copyright (c) 2021, Google Inc.
2 *
3 * Permission to use, copy, modify, and/or distribute this software for any
4 * purpose with or without fee is hereby granted, provided that the above
5 * copyright notice and this permission notice appear in all copies.
6 *
7 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
8 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
9 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
10 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
11 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
12 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
13 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
14
15 #include <openssl/blake2.h>
16
17 #include <openssl/type_check.h>
18
19 #include "../internal.h"
20
21 // https://tools.ietf.org/html/rfc7693#section-2.6
22 static const uint64_t kIV[8] = {
23 UINT64_C(0x6a09e667f3bcc908), UINT64_C(0xbb67ae8584caa73b),
24 UINT64_C(0x3c6ef372fe94f82b), UINT64_C(0xa54ff53a5f1d36f1),
25 UINT64_C(0x510e527fade682d1), UINT64_C(0x9b05688c2b3e6c1f),
26 UINT64_C(0x1f83d9abfb41bd6b), UINT64_C(0x5be0cd19137e2179),
27 };
28
29 // https://tools.ietf.org/html/rfc7693#section-2.7
30 static const uint8_t kSigma[10 * 16] = {
31 // clang-format off
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,
42 // clang-format on
43 };
44
45 #define RIGHT_ROTATE(v, n) (((v) >> (n)) | ((v) << (64 - (n))))
46
47 // https://tools.ietf.org/html/rfc7693#section-3.1
blake2b_mix(uint64_t v[16],int a,int b,int c,int d,uint64_t x,uint64_t y)48 static void blake2b_mix(uint64_t v[16], int a, int b, int c, int d, uint64_t x,
49 uint64_t y) {
50 v[a] = v[a] + v[b] + x;
51 v[d] = RIGHT_ROTATE(v[d] ^ v[a], 32);
52 v[c] = v[c] + v[d];
53 v[b] = RIGHT_ROTATE(v[b] ^ v[c], 24);
54 v[a] = v[a] + v[b] + y;
55 v[d] = RIGHT_ROTATE(v[d] ^ v[a], 16);
56 v[c] = v[c] + v[d];
57 v[b] = RIGHT_ROTATE(v[b] ^ v[c], 63);
58 }
59
blake2b_transform(BLAKE2B_CTX * b2b,const uint64_t block_words[BLAKE2B_CBLOCK/sizeof (uint64_t)],size_t num_bytes,int is_final_block)60 static void blake2b_transform(
61 BLAKE2B_CTX *b2b,
62 const uint64_t block_words[BLAKE2B_CBLOCK / sizeof(uint64_t)],
63 size_t num_bytes, int is_final_block) {
64 // https://tools.ietf.org/html/rfc7693#section-3.2
65 uint64_t v[16];
66 OPENSSL_STATIC_ASSERT(sizeof(v) == sizeof(b2b->h) + sizeof(kIV), "");
67 OPENSSL_memcpy(v, b2b->h, sizeof(b2b->h));
68 OPENSSL_memcpy(&v[8], kIV, sizeof(kIV));
69
70 b2b->t_low += num_bytes;
71 if (b2b->t_low < num_bytes) {
72 b2b->t_high++;
73 }
74 v[12] ^= b2b->t_low;
75 v[13] ^= b2b->t_high;
76
77 if (is_final_block) {
78 v[14] = ~v[14];
79 }
80
81 for (int round = 0; round < 12; round++) {
82 const uint8_t *const s = &kSigma[16 * (round % 10)];
83 blake2b_mix(v, 0, 4, 8, 12, block_words[s[0]], block_words[s[1]]);
84 blake2b_mix(v, 1, 5, 9, 13, block_words[s[2]], block_words[s[3]]);
85 blake2b_mix(v, 2, 6, 10, 14, block_words[s[4]], block_words[s[5]]);
86 blake2b_mix(v, 3, 7, 11, 15, block_words[s[6]], block_words[s[7]]);
87 blake2b_mix(v, 0, 5, 10, 15, block_words[s[8]], block_words[s[9]]);
88 blake2b_mix(v, 1, 6, 11, 12, block_words[s[10]], block_words[s[11]]);
89 blake2b_mix(v, 2, 7, 8, 13, block_words[s[12]], block_words[s[13]]);
90 blake2b_mix(v, 3, 4, 9, 14, block_words[s[14]], block_words[s[15]]);
91 }
92
93 for (size_t i = 0; i < OPENSSL_ARRAY_SIZE(b2b->h); i++) {
94 b2b->h[i] ^= v[i];
95 b2b->h[i] ^= v[i + 8];
96 }
97 }
98
BLAKE2B256_Init(BLAKE2B_CTX * b2b)99 void BLAKE2B256_Init(BLAKE2B_CTX *b2b) {
100 OPENSSL_memset(b2b, 0, sizeof(BLAKE2B_CTX));
101
102 OPENSSL_STATIC_ASSERT(sizeof(kIV) == sizeof(b2b->h), "");
103 OPENSSL_memcpy(&b2b->h, kIV, sizeof(kIV));
104
105 // https://tools.ietf.org/html/rfc7693#section-2.5
106 b2b->h[0] ^= 0x01010000 | BLAKE2B256_DIGEST_LENGTH;
107 }
108
BLAKE2B256_Update(BLAKE2B_CTX * b2b,const void * in_data,size_t len)109 void BLAKE2B256_Update(BLAKE2B_CTX *b2b, const void *in_data, size_t len) {
110 const uint8_t *data = (const uint8_t *)in_data;
111
112 size_t todo = sizeof(b2b->block.bytes) - b2b->block_used;
113 if (todo > len) {
114 todo = len;
115 }
116 OPENSSL_memcpy(&b2b->block.bytes[b2b->block_used], data, todo);
117 b2b->block_used += todo;
118 data += todo;
119 len -= todo;
120
121 if (!len) {
122 return;
123 }
124
125 // More input remains therefore we must have filled |b2b->block|.
126 assert(b2b->block_used == BLAKE2B_CBLOCK);
127 blake2b_transform(b2b, b2b->block.words, BLAKE2B_CBLOCK,
128 /*is_final_block=*/0);
129 b2b->block_used = 0;
130
131 while (len > BLAKE2B_CBLOCK) {
132 uint64_t block_words[BLAKE2B_CBLOCK / sizeof(uint64_t)];
133 OPENSSL_memcpy(block_words, data, sizeof(block_words));
134 blake2b_transform(b2b, block_words, BLAKE2B_CBLOCK, /*is_final_block=*/0);
135 data += BLAKE2B_CBLOCK;
136 len -= BLAKE2B_CBLOCK;
137 }
138
139 OPENSSL_memcpy(b2b->block.bytes, data, len);
140 b2b->block_used = len;
141 }
142
BLAKE2B256_Final(uint8_t out[BLAKE2B256_DIGEST_LENGTH],BLAKE2B_CTX * b2b)143 void BLAKE2B256_Final(uint8_t out[BLAKE2B256_DIGEST_LENGTH], BLAKE2B_CTX *b2b) {
144 OPENSSL_memset(&b2b->block.bytes[b2b->block_used], 0,
145 sizeof(b2b->block.bytes) - b2b->block_used);
146 blake2b_transform(b2b, b2b->block.words, b2b->block_used,
147 /*is_final_block=*/1);
148 OPENSSL_STATIC_ASSERT(BLAKE2B256_DIGEST_LENGTH <= sizeof(b2b->h), "");
149 memcpy(out, b2b->h, BLAKE2B256_DIGEST_LENGTH);
150 }
151
BLAKE2B256(const uint8_t * data,size_t len,uint8_t out[BLAKE2B256_DIGEST_LENGTH])152 void BLAKE2B256(const uint8_t *data, size_t len,
153 uint8_t out[BLAKE2B256_DIGEST_LENGTH]) {
154 BLAKE2B_CTX ctx;
155 BLAKE2B256_Init(&ctx);
156 BLAKE2B256_Update(&ctx, data, len);
157 BLAKE2B256_Final(out, &ctx);
158 }
159