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
|
/* See LICENSE file for copyright and license details. */
#include "common.h"
void
libsha2_digest(struct libsha2_state *restrict state, const void *message_, size_t msglen, void *output_)
{
const char *message = message_;
unsigned char *output = output_;
size_t off, i, n;
if (msglen & ~(size_t)7) {
libsha2_update(state, message, msglen & ~(size_t)7);
message += msglen & ~(size_t)7;
msglen &= (size_t)7;
}
off = (state->message_size / 8) % state->chunk_size;
if (msglen) {
state->chunk[off] = (unsigned char)(*message << (8 - (int)msglen));
state->chunk[off] |= (unsigned char)(1 << (7 - msglen));
state->chunk[off] &= (unsigned char)~((1 << (7 - msglen)) - 1);
state->message_size += msglen;
} else {
state->chunk[off] = 0x80;
}
off += 1;
if (off > state->chunk_size - (size_t)8 * (size_t)(1 + (state->algorithm > LIBSHA2_256))) {
memset(state->chunk + off, 0, state->chunk_size - off);
off = 0;
libsha2_process(state, state->chunk, state->chunk_size);
}
memset(state->chunk + off, 0, state->chunk_size - 8 - off);
state->chunk[state->chunk_size - 8] = (unsigned char)(state->message_size >> 56);
state->chunk[state->chunk_size - 7] = (unsigned char)(state->message_size >> 48);
state->chunk[state->chunk_size - 6] = (unsigned char)(state->message_size >> 40);
state->chunk[state->chunk_size - 5] = (unsigned char)(state->message_size >> 32);
state->chunk[state->chunk_size - 4] = (unsigned char)(state->message_size >> 24);
state->chunk[state->chunk_size - 3] = (unsigned char)(state->message_size >> 16);
state->chunk[state->chunk_size - 2] = (unsigned char)(state->message_size >> 8);
state->chunk[state->chunk_size - 1] = (unsigned char)(state->message_size >> 0);
libsha2_process(state, state->chunk, state->chunk_size);
n = libsha2_algorithm_output_size(state->algorithm);
if (state->algorithm <= LIBSHA2_256) {
for (i = 0, n /= 4; i < n; i++) {
output[4 * i + 0] = (unsigned char)(state->h.b32[i] >> 24);
output[4 * i + 1] = (unsigned char)(state->h.b32[i] >> 16);
output[4 * i + 2] = (unsigned char)(state->h.b32[i] >> 8);
output[4 * i + 3] = (unsigned char)(state->h.b32[i] >> 0);
}
} else {
for (i = 0, n = (n + 7) / 8; i < n; i++) {
output[8 * i + 0] = (unsigned char)(state->h.b64[i] >> 56);
output[8 * i + 1] = (unsigned char)(state->h.b64[i] >> 48);
output[8 * i + 2] = (unsigned char)(state->h.b64[i] >> 40);
output[8 * i + 3] = (unsigned char)(state->h.b64[i] >> 32);
output[8 * i + 4] = (unsigned char)(state->h.b64[i] >> 24);
output[8 * i + 5] = (unsigned char)(state->h.b64[i] >> 16);
output[8 * i + 6] = (unsigned char)(state->h.b64[i] >> 8);
output[8 * i + 7] = (unsigned char)(state->h.b64[i] >> 0);
}
}
}
|
