1 // Copyright 2021 The BoringSSL Authors
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // https://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 #include <openssl/blake2.h>
16
17 #include <assert.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 // 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)46 static void blake2b_mix(uint64_t v[16], int a, int b, int c, int d, uint64_t x,
47 uint64_t y) {
48 v[a] = v[a] + v[b] + x;
49 v[d] = CRYPTO_rotr_u64(v[d] ^ v[a], 32);
50 v[c] = v[c] + v[d];
51 v[b] = CRYPTO_rotr_u64(v[b] ^ v[c], 24);
52 v[a] = v[a] + v[b] + y;
53 v[d] = CRYPTO_rotr_u64(v[d] ^ v[a], 16);
54 v[c] = v[c] + v[d];
55 v[b] = CRYPTO_rotr_u64(v[b] ^ v[c], 63);
56 }
57
blake2b_load(const uint8_t block[BLAKE2B_CBLOCK],size_t i)58 static uint64_t blake2b_load(const uint8_t block[BLAKE2B_CBLOCK], size_t i) {
59 return CRYPTO_load_u64_le(block + 8 * i);
60 }
61
blake2b_transform(BLAKE2B_CTX * b2b,const uint8_t block[BLAKE2B_CBLOCK],size_t num_bytes,int is_final_block)62 static void blake2b_transform(BLAKE2B_CTX *b2b,
63 const uint8_t block[BLAKE2B_CBLOCK],
64 size_t num_bytes, int is_final_block) {
65 // https://tools.ietf.org/html/rfc7693#section-3.2
66 uint64_t v[16];
67 static_assert(sizeof(v) == sizeof(b2b->h) + sizeof(kIV));
68 OPENSSL_memcpy(v, b2b->h, sizeof(b2b->h));
69 OPENSSL_memcpy(&v[8], kIV, sizeof(kIV));
70
71 b2b->t_low += num_bytes;
72 if (b2b->t_low < num_bytes) {
73 b2b->t_high++;
74 }
75 v[12] ^= b2b->t_low;
76 v[13] ^= b2b->t_high;
77
78 if (is_final_block) {
79 v[14] = ~v[14];
80 }
81
82 for (int round = 0; round < 12; round++) {
83 const uint8_t *const s = &kSigma[16 * (round % 10)];
84 blake2b_mix(v, 0, 4, 8, 12, blake2b_load(block, s[0]),
85 blake2b_load(block, s[1]));
86 blake2b_mix(v, 1, 5, 9, 13, blake2b_load(block, s[2]),
87 blake2b_load(block, s[3]));
88 blake2b_mix(v, 2, 6, 10, 14, blake2b_load(block, s[4]),
89 blake2b_load(block, s[5]));
90 blake2b_mix(v, 3, 7, 11, 15, blake2b_load(block, s[6]),
91 blake2b_load(block, s[7]));
92 blake2b_mix(v, 0, 5, 10, 15, blake2b_load(block, s[8]),
93 blake2b_load(block, s[9]));
94 blake2b_mix(v, 1, 6, 11, 12, blake2b_load(block, s[10]),
95 blake2b_load(block, s[11]));
96 blake2b_mix(v, 2, 7, 8, 13, blake2b_load(block, s[12]),
97 blake2b_load(block, s[13]));
98 blake2b_mix(v, 3, 4, 9, 14, blake2b_load(block, s[14]),
99 blake2b_load(block, s[15]));
100 }
101
102 for (size_t i = 0; i < OPENSSL_ARRAY_SIZE(b2b->h); i++) {
103 b2b->h[i] ^= v[i];
104 b2b->h[i] ^= v[i + 8];
105 }
106 }
107
BLAKE2B256_Init(BLAKE2B_CTX * b2b)108 void BLAKE2B256_Init(BLAKE2B_CTX *b2b) {
109 OPENSSL_memset(b2b, 0, sizeof(BLAKE2B_CTX));
110
111 static_assert(sizeof(kIV) == sizeof(b2b->h));
112 OPENSSL_memcpy(&b2b->h, kIV, sizeof(kIV));
113
114 // https://tools.ietf.org/html/rfc7693#section-2.5
115 b2b->h[0] ^= 0x01010000 | BLAKE2B256_DIGEST_LENGTH;
116 }
117
BLAKE2B256_Update(BLAKE2B_CTX * b2b,const void * in_data,size_t len)118 void BLAKE2B256_Update(BLAKE2B_CTX *b2b, const void *in_data, size_t len) {
119 if (len == 0) {
120 // Work around a C language bug. See https://crbug.com/1019588.
121 return;
122 }
123
124 const uint8_t *data = reinterpret_cast<const uint8_t *>(in_data);
125 size_t todo = sizeof(b2b->block) - b2b->block_used;
126 if (todo > len) {
127 todo = len;
128 }
129 OPENSSL_memcpy(&b2b->block[b2b->block_used], data, todo);
130 b2b->block_used += todo;
131 data += todo;
132 len -= todo;
133
134 if (!len) {
135 return;
136 }
137
138 // More input remains therefore we must have filled |b2b->block|.
139 assert(b2b->block_used == BLAKE2B_CBLOCK);
140 blake2b_transform(b2b, b2b->block, BLAKE2B_CBLOCK,
141 /*is_final_block=*/0);
142 b2b->block_used = 0;
143
144 while (len > BLAKE2B_CBLOCK) {
145 blake2b_transform(b2b, data, BLAKE2B_CBLOCK, /*is_final_block=*/0);
146 data += BLAKE2B_CBLOCK;
147 len -= BLAKE2B_CBLOCK;
148 }
149
150 OPENSSL_memcpy(b2b->block, data, len);
151 b2b->block_used = len;
152 }
153
BLAKE2B256_Final(uint8_t out[BLAKE2B256_DIGEST_LENGTH],BLAKE2B_CTX * b2b)154 void BLAKE2B256_Final(uint8_t out[BLAKE2B256_DIGEST_LENGTH], BLAKE2B_CTX *b2b) {
155 OPENSSL_memset(&b2b->block[b2b->block_used], 0,
156 sizeof(b2b->block) - b2b->block_used);
157 blake2b_transform(b2b, b2b->block, b2b->block_used,
158 /*is_final_block=*/1);
159 static_assert(BLAKE2B256_DIGEST_LENGTH <= sizeof(b2b->h));
160 memcpy(out, b2b->h, BLAKE2B256_DIGEST_LENGTH);
161 }
162
BLAKE2B256(const uint8_t * data,size_t len,uint8_t out[BLAKE2B256_DIGEST_LENGTH])163 void BLAKE2B256(const uint8_t *data, size_t len,
164 uint8_t out[BLAKE2B256_DIGEST_LENGTH]) {
165 BLAKE2B_CTX ctx;
166 BLAKE2B256_Init(&ctx);
167 BLAKE2B256_Update(&ctx, data, len);
168 BLAKE2B256_Final(out, &ctx);
169 }
170