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
209
210
|
#include "tinysha256.h"
static inline uint32_t tinysha256_rotr(uint32_t x, int n)
{
return (x >> n) | (x << (32 - n));
}
static inline uint32_t tinysha256_step1(uint32_t e, uint32_t f, uint32_t g)
{
return (tinysha256_rotr(e, 6) ^ tinysha256_rotr(e, 11) ^ tinysha256_rotr(e, 25)) +
((e & f) ^ ((~e) & g));
}
static inline uint32_t tinysha256_step2(uint32_t a, uint32_t b, uint32_t c)
{
return (tinysha256_rotr(a, 2) ^ tinysha256_rotr(a, 13) ^ tinysha256_rotr(a, 22)) +
((a & b) ^ (a & c) ^ (b & c));
}
static inline void tinysha256_update_w(uint32_t *w, int i, const uint8_t *buffer)
{
int j;
for (j = 0; j < 16; j++) {
if (i < 16) {
w[j] = ((uint32_t)buffer[0] << 24) |
((uint32_t)buffer[1] << 16) |
((uint32_t)buffer[2] << 8) |
((uint32_t)buffer[3]);
buffer += 4;
} else {
uint32_t a = w[(j + 1) & 15];
uint32_t b = w[(j + 14) & 15];
uint32_t s0 = (tinysha256_rotr(a, 7) ^ tinysha256_rotr(a, 18) ^ (a >> 3));
uint32_t s1 = (tinysha256_rotr(b, 17) ^ tinysha256_rotr(b, 19) ^ (b >> 10));
w[j] += w[(j + 9) & 15] + s0 + s1;
}
}
}
static void tinysha256_block(tinysha256_ctx_t *ctx)
{
uint32_t *state = ctx->state;
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 a = state[0];
uint32_t b = state[1];
uint32_t c = state[2];
uint32_t d = state[3];
uint32_t e = state[4];
uint32_t f = state[5];
uint32_t g = state[6];
uint32_t h = state[7];
uint32_t w[16];
int i;
int j;
for (i = 0; i < 64; i += 16) {
tinysha256_update_w(w, i, ctx->buffer);
for (j = 0; j < 16; j += 4) {
uint32_t temp;
temp = h + tinysha256_step1(e, f, g) + k[i + j + 0] + w[j + 0];
h = temp + d;
d = temp + tinysha256_step2(a, b, c);
temp = g + tinysha256_step1(h, e, f) + k[i + j + 1] + w[j + 1];
g = temp + c;
c = temp + tinysha256_step2(d, a, b);
temp = f + tinysha256_step1(g, h, e) + k[i + j + 2] + w[j + 2];
f = temp + b;
b = temp + tinysha256_step2(c, d, a);
temp = e + tinysha256_step1(f, g, h) + k[i + j + 3] + w[j + 3];
e = temp + a;
a = temp + tinysha256_step2(b, c, d);
}
}
state[0] += a;
state[1] += b;
state[2] += c;
state[3] += d;
state[4] += e;
state[5] += f;
state[6] += g;
state[7] += h;
}
void tinysha256_init(tinysha256_ctx_t *ctx)
{
ctx->state[0] = 0x6a09e667;
ctx->state[1] = 0xbb67ae85;
ctx->state[2] = 0x3c6ef372;
ctx->state[3] = 0xa54ff53a;
ctx->state[4] = 0x510e527f;
ctx->state[5] = 0x9b05688c;
ctx->state[6] = 0x1f83d9ab;
ctx->state[7] = 0x5be0cd19;
ctx->n_bits = 0;
ctx->buffer_counter = 0;
}
static void tinysha256_append_byte(tinysha256_ctx_t *ctx, uint8_t byte)
{
ctx->buffer[ctx->buffer_counter++] = byte;
ctx->n_bits += 8;
if (ctx->buffer_counter == 64) {
ctx->buffer_counter = 0;
tinysha256_block(ctx);
}
}
void tinysha256_append(tinysha256_ctx_t *ctx, const void *src, size_t n_bytes)
{
const uint8_t *bytes = (const uint8_t *)src;
size_t i;
for (i = 0; i < n_bytes; i++) {
tinysha256_append_byte(ctx, bytes[i]);
}
}
static void tinysha256_finalize(tinysha256_ctx_t *ctx)
{
int i;
uint64_t n_bits = ctx->n_bits;
tinysha256_append_byte(ctx, 0x80);
while (ctx->buffer_counter != 56) {
tinysha256_append_byte(ctx, 0);
}
for (i = 7; i >= 0; i--) {
uint8_t byte = (uint8_t)((n_bits >> (8 * i)) & 0xff);
tinysha256_append_byte(ctx, byte);
}
}
void tinysha256_finalize_hex(tinysha256_ctx_t *ctx, char *dst_hex65)
{
int i;
int j;
tinysha256_finalize(ctx);
for (i = 0; i < 8; i++) {
for (j = 7; j >= 0; j--) {
uint8_t nibble = (uint8_t)((ctx->state[i] >> (j * 4)) & 0xf);
*dst_hex65++ = "0123456789abcdef"[nibble];
}
}
*dst_hex65 = '\0';
}
void tinysha256_finalize_bytes(tinysha256_ctx_t *ctx, void *dst_bytes32)
{
uint8_t *ptr = (uint8_t *)dst_bytes32;
int i;
int j;
tinysha256_finalize(ctx);
for (i = 0; i < 8; i++) {
for (j = 3; j >= 0; j--) {
*ptr++ = (uint8_t)((ctx->state[i] >> (j * 8)) & 0xff);
}
}
}
void tinysha256_hex(const void *src, size_t n_bytes, char *dst_hex65)
{
tinysha256_ctx_t ctx;
tinysha256_init(&ctx);
tinysha256_append(&ctx, src, n_bytes);
tinysha256_finalize_hex(&ctx, dst_hex65);
}
void tinysha256_bytes(const void *src, size_t n_bytes, void *dst_bytes32)
{
tinysha256_ctx_t ctx;
tinysha256_init(&ctx);
tinysha256_append(&ctx, src, n_bytes);
tinysha256_finalize_bytes(&ctx, dst_bytes32);
}
|
