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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