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
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
|
/* See LICENSE file for copyright and license details. */
#include "common.h"
#ifdef SUPPORT_MD5
static const uint32_t S[64] = {
0xd76aa478UL, 0xe8c7b756UL, 0x242070dbUL, 0xc1bdceeeUL, 0xf57c0fafUL, 0x4787c62aUL, 0xa8304613UL, 0xfd469501UL,
0x698098d8UL, 0x8b44f7afUL, 0xffff5bb1UL, 0x895cd7beUL, 0x6b901122UL, 0xfd987193UL, 0xa679438eUL, 0x49b40821UL,
0xf61e2562UL, 0xc040b340UL, 0x265e5a51UL, 0xe9b6c7aaUL, 0xd62f105dUL, 0x02441453UL, 0xd8a1e681UL, 0xe7d3fbc8UL,
0x21e1cde6UL, 0xc33707d6UL, 0xf4d50d87UL, 0x455a14edUL, 0xa9e3e905UL, 0xfcefa3f8UL, 0x676f02d9UL, 0x8d2a4c8aUL,
0xfffa3942UL, 0x8771f681UL, 0x6d9d6122UL, 0xfde5380cUL, 0xa4beea44UL, 0x4bdecfa9UL, 0xf6bb4b60UL, 0xbebfbc70UL,
0x289b7ec6UL, 0xeaa127faUL, 0xd4ef3085UL, 0x04881d05UL, 0xd9d4d039UL, 0xe6db99e5UL, 0x1fa27cf8UL, 0xc4ac5665UL,
0xf4292244UL, 0x432aff97UL, 0xab9423a7UL, 0xfc93a039UL, 0x655b59c3UL, 0x8f0ccc92UL, 0xffeff47dUL, 0x85845dd1UL,
0x6fa87e4fUL, 0xfe2ce6e0UL, 0xa3014314UL, 0x4e0811a1UL, 0xf7537e82UL, 0xbd3af235UL, 0x2ad7d2bbUL, 0xeb86d391UL
};
static uint32_t rol32(uint32_t n, int k) { return (n << k) | (n >> (32 - k)); } /* k != 0, 32 */
static void
process_block(uint32_t h[4], const uint8_t *x, uint32_t w[16])
{
#define F(x, y, z) (z ^ (x & (y ^ z)))
#define G(x, y, z) (y ^ (z & (y ^ x)))
#define H(x, y, z) (x ^ y ^ z)
#define I(x, y, z) (y ^ (x | ~z))
#define FF(a, b, c, d, w, s, t) (a += F(b, c, d) + w + t, a = rol32(a, s) + b)
#define GG(a, b, c, d, w, s, t) (a += G(b, c, d) + w + t, a = rol32(a, s) + b)
#define HH(a, b, c, d, w, s, t) (a += H(b, c, d) + w + t, a = rol32(a, s) + b)
#define II(a, b, c, d, w, s, t) (a += I(b, c, d) + w + t, a = rol32(a, s) + b)
register uint32_t a, b, c, d;
unsigned i;
for (i = 0; i < 16U; i++) {
w[i] = (uint32_t)x[4U * i + 0U] << 0;
w[i] |= (uint32_t)x[4U * i + 1U] << 8;
w[i] |= (uint32_t)x[4U * i + 2U] << 16;
w[i] |= (uint32_t)x[4U * i + 3U] << 24;
}
a = h[0];
b = h[1];
c = h[2];
d = h[3];
i = 0U;
while (i < 16U) {
FF(a, b, c, d, w[i], 7, S[i]), i++;
FF(d, a, b, c, w[i], 12, S[i]), i++;
FF(c, d, a, b, w[i], 17, S[i]), i++;
FF(b, c, d, a, w[i], 22, S[i]), i++;
}
while (i < 32U) {
GG(a, b, c, d, w[(5 * i + 1) % 16], 5, S[i]), i++;
GG(d, a, b, c, w[(5 * i + 1) % 16], 9, S[i]), i++;
GG(c, d, a, b, w[(5 * i + 1) % 16], 14, S[i]), i++;
GG(b, c, d, a, w[(5 * i + 1) % 16], 20, S[i]), i++;
}
while (i < 48U) {
HH(a, b, c, d, w[(3 * i + 5) % 16], 4, S[i]), i++;
HH(d, a, b, c, w[(3 * i + 5) % 16], 11, S[i]), i++;
HH(c, d, a, b, w[(3 * i + 5) % 16], 16, S[i]), i++;
HH(b, c, d, a, w[(3 * i + 5) % 16], 23, S[i]), i++;
}
while (i < 64U) {
II(a, b, c, d, w[7 * i % 16], 6, S[i]), i++;
II(d, a, b, c, w[7 * i % 16], 10, S[i]), i++;
II(c, d, a, b, w[7 * i % 16], 15, S[i]), i++;
II(b, c, d, a, w[7 * i % 16], 21, S[i]), i++;
}
h[0] += a;
h[1] += b;
h[2] += c;
h[3] += d;
}
LIBHASHSUM_1_NONNULL_
static size_t
process(struct libhashsum_hasher *this, const void *data, size_t bytes)
{
const uint8_t *m = data;
size_t off = 0;
for (; bytes - off >= 64U; off += 64U)
process_block(this->state.md5.h.h32, &m[off], this->state.md5.w);
this->state.md5.count += off;
return off;
}
LIBHASHSUM_1_NONNULL_
static int
finalise_common(struct libhashsum_hasher *this, uint8_t *m, size_t bytes, unsigned extra_bits)
{
uint8_t mask;
unsigned i;
register uint32_t hi;
if (extra_bits > 7U) {
errno = EINVAL;
return -1;
}
this->state.md5.count += bytes;
this->state.md5.count *= 8U;
this->state.md5.count += (size_t)extra_bits;
if (extra_bits)
m[bytes] = libhashsum_reverse_byte__(m[bytes]);
mask = (uint8_t)(1U << (7U - extra_bits));
m[bytes] |= mask;
m[bytes] &= (uint8_t)~(mask - 1U); /* keep high bits (original value was reversed) */
bytes++;
if (bytes > 56U) {
memset(&m[bytes], 0, 64U - bytes);
process_block(this->state.md5.h.h32, m, this->state.md5.w);
bytes = 0;
}
memset(&m[bytes], 0, 56U - bytes);
m[56] = (uint8_t)(this->state.md5.count >> 0);
m[57] = (uint8_t)(this->state.md5.count >> 8);
m[58] = (uint8_t)(this->state.md5.count >> 16);
m[59] = (uint8_t)(this->state.md5.count >> 24);
m[60] = (uint8_t)(this->state.md5.count >> 32);
m[61] = (uint8_t)(this->state.md5.count >> 40);
m[62] = (uint8_t)(this->state.md5.count >> 48);
m[63] = (uint8_t)(this->state.md5.count >> 56);
process_block(this->state.md5.h.h32, m, this->state.md5.w);
memset(this->state.md5.m, 0, sizeof(this->state.md5.m));
memset(this->state.md5.w, 0, sizeof(this->state.md5.w));
this->state.md5.count = 0;
if (!this->hash_output)
this->hash_output = this->state.md5.h.sum;
for (i = 0; i < 4U; i++) {
hi = this->state.md5.h.h32[i];
this->hash_output[i * 4U + 0U] = (uint8_t)(hi >> 0);
this->hash_output[i * 4U + 1U] = (uint8_t)(hi >> 8);
this->hash_output[i * 4U + 2U] = (uint8_t)(hi >> 16);
this->hash_output[i * 4U + 3U] = (uint8_t)(hi >> 24);
}
return 0;
}
LIBHASHSUM_1_NONNULL_
static int
finalise_const(struct libhashsum_hasher *this, const void *data, size_t bytes, unsigned extra_bits)
{
const uint8_t *m = data;
size_t r;
r = process(this, m, bytes);
m = &m[r];
bytes -= r;
this->state.md5.m[bytes] = 0;
memcpy(this->state.md5.m, m, bytes + (size_t)(extra_bits > 0U));
return finalise_common(this, this->state.md5.m, bytes, extra_bits);
}
LIBHASHSUM_1_NONNULL_
static int
finalise(struct libhashsum_hasher *this, void *data, size_t bytes, unsigned extra_bits, size_t size)
{
uint8_t *m = data;
size_t r;
r = process(this, m, bytes);
m = &m[r];
bytes -= r;
size -= r;
if (size < 64U) {
memcpy(this->state.md5.m, m, bytes + (size_t)(extra_bits > 0U));
m = this->state.md5.m;
}
return finalise_common(this, m, bytes, extra_bits);
}
int
libhashsum_init_md5_hasher(struct libhashsum_hasher *this)
{
this->algorithm = LIBHASHSUM_MD5;
this->algorithm_string = "MD5";
this->input_block_size = 64U;
this->hash_size = sizeof(this->state.md5.h.sum);
this->hash_output = NULL;
this->supports_non_whole_bytes = 1;
this->standard_partial_byte_input_encoding = LIBHASHSUM_MOST_SIGNIFICANT;
this->standard_partial_byte_output_encoding = LIBHASHSUM_UNSUPPORTED;
this->hash_excess_bits = 0;
this->process = &process;
this->finalise_const = &finalise_const;
this->finalise = &finalise;
this->stretch = NULL;
this->destroy = NULL;
memset(&this->state.md5, 0, sizeof(this->state.md5));
this->state.md5.h.h32[0] = UINT32_C(0x67452301);
this->state.md5.h.h32[1] = UINT32_C(0xefcdab89);
this->state.md5.h.h32[2] = UINT32_C(0x98badcfe);
this->state.md5.h.h32[3] = UINT32_C(0x10325476);
return 0;
}
#else
int
libhashsum_init_md5_hasher(struct libhashsum_hasher *this)
{
(void) this;
errno = ENOSYS;
return -1;
}
#endif
|
