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
|
/*
* Based on the Mozilla SHA1 (see mozilla-sha1/sha1.c),
* optimized to do word accesses rather than byte accesses,
* and to avoid unnecessary copies into the context array.
*/
#include <string.h>
#include <arpa/inet.h>
#include "sha1.h"
/* Hash one 64-byte block of data */
static void blk_SHA1Block(blk_SHA_CTX *ctx, const unsigned int *data);
void blk_SHA1_Init(blk_SHA_CTX *ctx)
{
ctx->lenW = 0;
ctx->size = 0;
/* Initialize H with the magic constants (see FIPS180 for constants)
*/
ctx->H[0] = 0x67452301;
ctx->H[1] = 0xefcdab89;
ctx->H[2] = 0x98badcfe;
ctx->H[3] = 0x10325476;
ctx->H[4] = 0xc3d2e1f0;
}
void blk_SHA1_Update(blk_SHA_CTX *ctx, const void *data, unsigned long len)
{
int lenW = ctx->lenW;
ctx->size += (unsigned long long) len << 3;
/* Read the data into W and process blocks as they get full
*/
if (lenW) {
int left = 64 - lenW;
if (len < left)
left = len;
memcpy(lenW + (char *)ctx->W, data, left);
lenW = (lenW + left) & 63;
len -= left;
data += left;
ctx->lenW = lenW;
if (lenW)
return;
blk_SHA1Block(ctx, ctx->W);
}
while (len >= 64) {
blk_SHA1Block(ctx, data);
data += 64;
len -= 64;
}
if (len) {
memcpy(ctx->W, data, len);
ctx->lenW = len;
}
}
void blk_SHA1_Final(unsigned char hashout[20], blk_SHA_CTX *ctx)
{
static const unsigned char pad[64] = { 0x80 };
unsigned int padlen[2];
int i;
/* Pad with a binary 1 (ie 0x80), then zeroes, then length
*/
padlen[0] = htonl(ctx->size >> 32);
padlen[1] = htonl(ctx->size);
blk_SHA1_Update(ctx, pad, 1+ (63 & (55 - ctx->lenW)));
blk_SHA1_Update(ctx, padlen, 8);
/* Output hash
*/
for (i = 0; i < 5; i++)
((unsigned int *)hashout)[i] = htonl(ctx->H[i]);
}
#define SHA_ROT(X,n) (((X) << (n)) | ((X) >> (32-(n))))
static void blk_SHA1Block(blk_SHA_CTX *ctx, const unsigned int *data)
{
int t;
unsigned int A,B,C,D,E,TEMP;
unsigned int W[80];
for (t = 0; t < 16; t++)
W[t] = htonl(data[t]);
/* Unroll it? */
for (t = 16; t <= 79; t++)
W[t] = SHA_ROT(W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16], 1);
A = ctx->H[0];
B = ctx->H[1];
C = ctx->H[2];
D = ctx->H[3];
E = ctx->H[4];
#define T_0_19(t) \
TEMP = SHA_ROT(A,5) + (((C^D)&B)^D) + E + W[t] + 0x5a827999; \
E = D; D = C; C = SHA_ROT(B, 30); B = A; A = TEMP;
T_0_19( 0); T_0_19( 1); T_0_19( 2); T_0_19( 3); T_0_19( 4);
T_0_19( 5); T_0_19( 6); T_0_19( 7); T_0_19( 8); T_0_19( 9);
T_0_19(10); T_0_19(11); T_0_19(12); T_0_19(13); T_0_19(14);
T_0_19(15); T_0_19(16); T_0_19(17); T_0_19(18); T_0_19(19);
#define T_20_39(t) \
TEMP = SHA_ROT(A,5) + (B^C^D) + E + W[t] + 0x6ed9eba1; \
E = D; D = C; C = SHA_ROT(B, 30); B = A; A = TEMP;
T_20_39(20); T_20_39(21); T_20_39(22); T_20_39(23); T_20_39(24);
T_20_39(25); T_20_39(26); T_20_39(27); T_20_39(28); T_20_39(29);
T_20_39(30); T_20_39(31); T_20_39(32); T_20_39(33); T_20_39(34);
T_20_39(35); T_20_39(36); T_20_39(37); T_20_39(38); T_20_39(39);
#define T_40_59(t) \
TEMP = SHA_ROT(A,5) + ((B&C)|(D&(B|C))) + E + W[t] + 0x8f1bbcdc; \
E = D; D = C; C = SHA_ROT(B, 30); B = A; A = TEMP;
T_40_59(40); T_40_59(41); T_40_59(42); T_40_59(43); T_40_59(44);
T_40_59(45); T_40_59(46); T_40_59(47); T_40_59(48); T_40_59(49);
T_40_59(50); T_40_59(51); T_40_59(52); T_40_59(53); T_40_59(54);
T_40_59(55); T_40_59(56); T_40_59(57); T_40_59(58); T_40_59(59);
#define T_60_79(t) \
TEMP = SHA_ROT(A,5) + (B^C^D) + E + W[t] + 0xca62c1d6; \
E = D; D = C; C = SHA_ROT(B, 30); B = A; A = TEMP;
T_60_79(60); T_60_79(61); T_60_79(62); T_60_79(63); T_60_79(64);
T_60_79(65); T_60_79(66); T_60_79(67); T_60_79(68); T_60_79(69);
T_60_79(70); T_60_79(71); T_60_79(72); T_60_79(73); T_60_79(74);
T_60_79(75); T_60_79(76); T_60_79(77); T_60_79(78); T_60_79(79);
ctx->H[0] += A;
ctx->H[1] += B;
ctx->H[2] += C;
ctx->H[3] += D;
ctx->H[4] += E;
}
|
