1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
|
/* Copyright 2015 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "dcrypto.h"
#include "endian.h"
#include "internal.h"
#include "registers.h"
#include "util.h"
static void SHA256_transform(struct sha256_ctx *const ctx)
{
static const uint32_t K[64] = {
0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b,
0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01,
0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7,
0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152,
0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,
0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc,
0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819,
0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08,
0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f,
0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
};
uint32_t W[64];
uint32_t A, B, C, D, E, F, G, H;
size_t t;
for (t = 0; t < 16; ++t)
W[t] = be32toh(ctx->b32[t]);
for (; t < 64; t++) {
uint32_t s0 = ror(W[t - 15], 7) ^ ror(W[t - 15], 18) ^
(W[t - 15] >> 3);
uint32_t s1 = ror(W[t - 2], 17) ^ ror(W[t - 2], 19) ^
(W[t - 2] >> 10);
W[t] = W[t - 16] + s0 + W[t - 7] + s1;
}
A = ctx->state[0];
B = ctx->state[1];
C = ctx->state[2];
D = ctx->state[3];
E = ctx->state[4];
F = ctx->state[5];
G = ctx->state[6];
H = ctx->state[7];
for (t = 0; t < 64; t++) {
uint32_t s0 = ror(A, 2) ^ ror(A, 13) ^ ror(A, 22);
uint32_t maj = (A & B) ^ (A & C) ^ (B & C);
uint32_t t2 = s0 + maj;
uint32_t s1 = ror(E, 6) ^ ror(E, 11) ^ ror(E, 25);
uint32_t ch = (E & F) ^ ((~E) & G);
uint32_t t1 = H + s1 + ch + K[t] + W[t];
H = G;
G = F;
F = E;
E = D + t1;
D = C;
C = B;
B = A;
A = t1 + t2;
}
ctx->state[0] += A;
ctx->state[1] += B;
ctx->state[2] += C;
ctx->state[3] += D;
ctx->state[4] += E;
ctx->state[5] += F;
ctx->state[6] += G;
ctx->state[7] += H;
}
/**
* Define aliases taking union type as parameter. This is safe
* as union type has header in same place and is not less than original type.
* Equal to:
* void SHA256_init_as_hash(HASH_CTX *const ctx) {SHA256_init(&ctx.sha256);}
* but save some space for embedded uses.
*/
BUILD_ASSERT(sizeof(union hash_ctx) >= sizeof(struct sha256_ctx));
BUILD_ASSERT(sizeof(union hash_ctx) >= sizeof(struct sha224_ctx));
static void SHA256_init_as_hash(union hash_ctx *const ctx)
__alias(SHA256_sw_init);
static void SHA256_update_as_hash(union hash_ctx *const ctx, const void *data,
size_t len) __alias(SHA256_sw_update);
static const union sha_digests *SHA256_final_as_hash(union hash_ctx *const ctx)
__alias(SHA256_sw_final);
static void SHA224_init_as_hash(union hash_ctx *const ctx)
__alias(SHA224_sw_init);
void SHA256_sw_init(struct sha256_ctx *const ctx)
{
static const struct hash_vtable sha256_vtable = {
SHA256_init_as_hash, SHA256_update_as_hash,
SHA256_final_as_hash, HMAC_sw_final,
SHA256_DIGEST_SIZE, SHA256_BLOCK_SIZE,
sizeof(struct sha256_ctx)
};
static const uint32_t sha256_init[SHA256_DIGEST_WORDS] = {
0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19
};
ctx->f = &sha256_vtable;
memcpy(ctx->state, sha256_init, sizeof(ctx->state));
ctx->count = 0;
}
/* SHA2-224 and SHA2-256 use same internal context. */
BUILD_ASSERT(sizeof(struct sha224_ctx) == sizeof(struct sha256_ctx));
void SHA224_sw_update(struct sha224_ctx *ctx, const void *data, size_t len)
__alias(SHA256_sw_update);
void SHA256_sw_update(struct sha256_ctx *ctx, const void *data, size_t len)
{
size_t i = ctx->count & (SHA256_BLOCK_SIZE - 1);
const uint8_t *p = (const uint8_t *)data;
ctx->count += len;
while (len--) {
ctx->b8[i++] = *p++;
if (i == SHA256_BLOCK_SIZE) {
SHA256_transform(ctx);
i = 0;
}
}
}
const struct sha224_digest *SHA224_sw_final(struct sha224_ctx *const ctx)
__alias(SHA256_sw_final);
const struct sha256_digest *SHA256_sw_final(struct sha256_ctx *const ctx)
{
uint64_t cnt = (uint64_t)ctx->count * CHAR_BIT;
size_t i = ctx->count & (SHA256_BLOCK_SIZE - 1);
/**
* append the bit '1' to the message which would be 0x80 if message
* length is a multiple of 8 bits.
*/
ctx->b8[i++] = 0x80;
/**
* Append 0 ≤ k < 512 bits '0', such that the resulting message length
* in bits is congruent to −64 ≡ 448 (mod 512).
*/
if (i > (SHA256_BLOCK_SIZE - sizeof(cnt))) {
/* Current block won't fit length, so move to next. */
while (i < SHA256_BLOCK_SIZE)
ctx->b8[i++] = 0;
SHA256_transform(ctx);
i = 0;
}
/* Pad rest of zeros. */
while (i < (SHA256_BLOCK_SIZE - sizeof(cnt)))
ctx->b8[i++] = 0;
/* Place big-endian 64-bit bit counter at the end of block. */
ctx->b64[SHA256_BLOCK_DWORDS - 1] = htobe64(cnt);
SHA256_transform(ctx);
for (i = 0; i < 8; i++)
ctx->b32[i] = htobe32(ctx->state[i]);
return &ctx->digest;
}
void SHA224_sw_init(struct sha224_ctx *const ctx)
{
/* SHA2-224 differs from SHA2-256 only in initialization. */
static const struct hash_vtable sha224_vtable = {
SHA224_init_as_hash, SHA256_update_as_hash,
SHA256_final_as_hash, HMAC_sw_final,
SHA224_DIGEST_SIZE, SHA224_BLOCK_SIZE,
sizeof(struct sha224_ctx)
};
static const uint32_t sha224_init[SHA256_DIGEST_WORDS] = {
0xc1059ed8, 0x367cd507, 0x3070dd17, 0xf70e5939,
0xffc00b31, 0x68581511, 0x64f98fa7, 0xbefa4fa4
};
ctx->f = &sha224_vtable;
memcpy(ctx->state, sha224_init, sizeof(ctx->state));
ctx->count = 0;
}
/* One shot hash computation. */
const struct sha224_digest *SHA224_sw_hash(const void *data, size_t len,
struct sha224_digest *digest)
{
struct sha224_ctx ctx;
SHA224_sw_init(&ctx);
SHA224_sw_update(&ctx, data, len);
memcpy(digest->b8, SHA224_sw_final(&ctx), SHA224_DIGEST_SIZE);
return digest;
}
/* One shot hash computation */
const struct sha256_digest *SHA256_sw_hash(const void *data, size_t len,
struct sha256_digest *digest)
{
struct sha256_ctx ctx;
SHA256_sw_init(&ctx);
SHA256_sw_update(&ctx, data, len);
memcpy(digest->b8, SHA256_sw_final(&ctx)->b8, SHA256_DIGEST_SIZE);
return digest;
}
|
