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1 office 1 #include "t_defines.h"
2 #include "t_sha.h"
3  
4 /*
5 SHA-1 in C
6 By Steve Reid <steve@edmweb.com>
7 100% Public Domain
8  
9 Test Vectors (from FIPS PUB 180-1)
10 "abc"
11 A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D
12 "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"
13 84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1
14 A million repetitions of "a"
15 34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F
16 */
17  
18 /* #define WORDS_BIGENDIAN * This should be #define'd if true. */
19 /* #define SHA1HANDSOFF * Copies data before messing with it. */
20  
21 #include <stdio.h>
22 #include <string.h>
23  
24 static void SHA1Transform(uint32 state[5], const unsigned char buffer[64]);
25  
26 #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
27  
28 /* blk0() and blk() perform the initial expand. */
29 /* I got the idea of expanding during the round function from SSLeay */
30 #ifndef WORDS_BIGENDIAN
31 #define blk0(i) (block->l[i] = (rol(block->l[i],24)&0xFF00FF00) \
32 |(rol(block->l[i],8)&0x00FF00FF))
33 #else
34 #define blk0(i) block->l[i]
35 #endif
36 #define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
37 ^block->l[(i+2)&15]^block->l[i&15],1))
38  
39 /* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */
40 #define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);
41 #define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
42 #define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
43 #define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
44 #define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
45  
46 /* Hash a single 512-bit block. This is the core of the algorithm. */
47  
48 static void SHA1Transform(uint32 state[5], const unsigned char buffer[64])
49 {
50 uint32 a, b, c, d, e;
51 typedef union {
52 unsigned char c[64];
53 uint32 l[16];
54 } CHAR64LONG16;
55 CHAR64LONG16* block;
56 #ifdef SHA1HANDSOFF
57 static unsigned char workspace[64];
58 block = (CHAR64LONG16*)workspace;
59 memcpy(block, buffer, 64);
60 #else
61 block = (CHAR64LONG16*)buffer;
62 #endif
63 /* Copy context->state[] to working vars */
64 a = state[0];
65 b = state[1];
66 c = state[2];
67 d = state[3];
68 e = state[4];
69 /* 4 rounds of 20 operations each. Loop unrolled. */
70 R0(a,b,c,d,e, 0); R0(e,a,b,c,d, 1); R0(d,e,a,b,c, 2); R0(c,d,e,a,b, 3);
71 R0(b,c,d,e,a, 4); R0(a,b,c,d,e, 5); R0(e,a,b,c,d, 6); R0(d,e,a,b,c, 7);
72 R0(c,d,e,a,b, 8); R0(b,c,d,e,a, 9); R0(a,b,c,d,e,10); R0(e,a,b,c,d,11);
73 R0(d,e,a,b,c,12); R0(c,d,e,a,b,13); R0(b,c,d,e,a,14); R0(a,b,c,d,e,15);
74 R1(e,a,b,c,d,16); R1(d,e,a,b,c,17); R1(c,d,e,a,b,18); R1(b,c,d,e,a,19);
75 R2(a,b,c,d,e,20); R2(e,a,b,c,d,21); R2(d,e,a,b,c,22); R2(c,d,e,a,b,23);
76 R2(b,c,d,e,a,24); R2(a,b,c,d,e,25); R2(e,a,b,c,d,26); R2(d,e,a,b,c,27);
77 R2(c,d,e,a,b,28); R2(b,c,d,e,a,29); R2(a,b,c,d,e,30); R2(e,a,b,c,d,31);
78 R2(d,e,a,b,c,32); R2(c,d,e,a,b,33); R2(b,c,d,e,a,34); R2(a,b,c,d,e,35);
79 R2(e,a,b,c,d,36); R2(d,e,a,b,c,37); R2(c,d,e,a,b,38); R2(b,c,d,e,a,39);
80 R3(a,b,c,d,e,40); R3(e,a,b,c,d,41); R3(d,e,a,b,c,42); R3(c,d,e,a,b,43);
81 R3(b,c,d,e,a,44); R3(a,b,c,d,e,45); R3(e,a,b,c,d,46); R3(d,e,a,b,c,47);
82 R3(c,d,e,a,b,48); R3(b,c,d,e,a,49); R3(a,b,c,d,e,50); R3(e,a,b,c,d,51);
83 R3(d,e,a,b,c,52); R3(c,d,e,a,b,53); R3(b,c,d,e,a,54); R3(a,b,c,d,e,55);
84 R3(e,a,b,c,d,56); R3(d,e,a,b,c,57); R3(c,d,e,a,b,58); R3(b,c,d,e,a,59);
85 R4(a,b,c,d,e,60); R4(e,a,b,c,d,61); R4(d,e,a,b,c,62); R4(c,d,e,a,b,63);
86 R4(b,c,d,e,a,64); R4(a,b,c,d,e,65); R4(e,a,b,c,d,66); R4(d,e,a,b,c,67);
87 R4(c,d,e,a,b,68); R4(b,c,d,e,a,69); R4(a,b,c,d,e,70); R4(e,a,b,c,d,71);
88 R4(d,e,a,b,c,72); R4(c,d,e,a,b,73); R4(b,c,d,e,a,74); R4(a,b,c,d,e,75);
89 R4(e,a,b,c,d,76); R4(d,e,a,b,c,77); R4(c,d,e,a,b,78); R4(b,c,d,e,a,79);
90 /* Add the working vars back into context.state[] */
91 state[0] += a;
92 state[1] += b;
93 state[2] += c;
94 state[3] += d;
95 state[4] += e;
96 /* Wipe variables */
97 a = b = c = d = e = 0;
98 }
99  
100  
101 /* SHA1Init - Initialize new context */
102  
103 void SHA1Init(SHA1_CTX* context)
104 {
105 /* SHA1 initialization constants */
106 context->state[0] = 0x67452301;
107 context->state[1] = 0xEFCDAB89;
108 context->state[2] = 0x98BADCFE;
109 context->state[3] = 0x10325476;
110 context->state[4] = 0xC3D2E1F0;
111 context->count[0] = context->count[1] = 0;
112 }
113  
114  
115 /* Run your data through this. */
116  
117 void SHA1Update(SHA1_CTX* context, const unsigned char* data, unsigned int len)
118 {
119 unsigned int i, j;
120  
121 j = (context->count[0] >> 3) & 63;
122 if ((context->count[0] += len << 3) < (len << 3)) context->count[1]++;
123 context->count[1] += (len >> 29);
124 if ((j + len) > 63) {
125 memcpy(&context->buffer[j], data, (i = 64-j));
126 SHA1Transform(context->state, context->buffer);
127 for ( ; i + 63 < len; i += 64) {
128 SHA1Transform(context->state, &data[i]);
129 }
130 j = 0;
131 }
132 else i = 0;
133 memcpy(&context->buffer[j], &data[i], len - i);
134 }
135  
136  
137 /* Add padding and return the message digest. */
138  
139 void SHA1Final(unsigned char digest[20], SHA1_CTX* context)
140 {
141 uint32 i, j;
142 unsigned char finalcount[8];
143  
144 for (i = 0; i < 8; i++) {
145 finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)]
146 >> ((3-(i & 3)) * 8) ) & 255); /* Endian independent */
147 }
148 SHA1Update(context, (unsigned char *)"\200", 1);
149 while ((context->count[0] & 504) != 448) {
150 SHA1Update(context, (unsigned char *)"\0", 1);
151 }
152 SHA1Update(context, finalcount, 8); /* Should cause a SHA1Transform() */
153 for (i = 0; i < 20; i++) {
154 digest[i] = (unsigned char)
155 ((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
156 }
157 /* Wipe variables */
158 i = j = 0;
159 memset(context->buffer, 0, 64);
160 memset(context->state, 0, 20);
161 memset(context->count, 0, 8);
162 memset(&finalcount, 0, 8);
163 #ifdef SHA1HANDSOFF /* make SHA1Transform overwrite its own static vars */
164 SHA1Transform(context->state, context->buffer);
165 #endif
166 }