sha1.c (7585B)
1 2 /* from valgrind tests */ 3 4 /* ================ sha1.c ================ */ 5 /* 6 SHA-1 in C 7 By Steve Reid <steve@edmweb.com> 8 100% Public Domain 9 10 Test Vectors (from FIPS PUB 180-1) 11 "abc" 12 A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D 13 "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq" 14 84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1 15 A million repetitions of "a" 16 34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F 17 */ 18 19 /* #define LITTLE_ENDIAN * This should be #define'd already, if true. */ 20 /* #define SHA1HANDSOFF * Copies data before messing with it. */ 21 22 #define SHA1HANDSOFF 23 24 #include <stdio.h> 25 #include <string.h> 26 #include <stdint.h> 27 28 /* ================ sha1.h ================ */ 29 /* 30 SHA-1 in C 31 By Steve Reid <steve@edmweb.com> 32 100% Public Domain 33 */ 34 35 typedef struct { 36 uint32_t state[5]; 37 uint32_t count[2]; 38 unsigned char buffer[64]; 39 } SHA1_CTX; 40 41 void SHA1Transform(uint32_t state[5], const unsigned char buffer[64]); 42 void SHA1Init(SHA1_CTX* context); 43 void SHA1Update(SHA1_CTX* context, const unsigned char* data, uint32_t len); 44 void SHA1Final(unsigned char digest[20], SHA1_CTX* context); 45 /* ================ end of sha1.h ================ */ 46 47 #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits)))) 48 49 /* blk0() and blk() perform the initial expand. */ 50 /* I got the idea of expanding during the round function from SSLeay */ 51 #if BYTE_ORDER == LITTLE_ENDIAN 52 #define blk0(i) (block->l[i] = (rol(block->l[i],24)&0xFF00FF00) \ 53 |(rol(block->l[i],8)&0x00FF00FF)) 54 #elif BYTE_ORDER == BIG_ENDIAN 55 #define blk0(i) block->l[i] 56 #else 57 #error "Endianness not defined!" 58 #endif 59 #define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \ 60 ^block->l[(i+2)&15]^block->l[i&15],1)) 61 62 /* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */ 63 #define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30); 64 #define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30); 65 #define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30); 66 #define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30); 67 #define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30); 68 69 70 /* Hash a single 512-bit block. This is the core of the algorithm. */ 71 72 void SHA1Transform(uint32_t state[5], const unsigned char buffer[64]) 73 { 74 uint32_t a, b, c, d, e; 75 typedef union { 76 unsigned char c[64]; 77 uint32_t l[16]; 78 } CHAR64LONG16; 79 #ifdef SHA1HANDSOFF 80 CHAR64LONG16 block[1]; /* use array to appear as a pointer */ 81 memcpy(block, buffer, 64); 82 #else 83 /* The following had better never be used because it causes the 84 * pointer-to-const buffer to be cast into a pointer to non-const. 85 * And the result is written through. I threw a "const" in, hoping 86 * this will cause a diagnostic. 87 */ 88 CHAR64LONG16* block = (const CHAR64LONG16*)buffer; 89 #endif 90 /* Copy context->state[] to working vars */ 91 a = state[0]; 92 b = state[1]; 93 c = state[2]; 94 d = state[3]; 95 e = state[4]; 96 /* 4 rounds of 20 operations each. Loop unrolled. */ 97 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); 98 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); 99 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); 100 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); 101 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); 102 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); 103 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); 104 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); 105 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); 106 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); 107 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); 108 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); 109 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); 110 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); 111 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); 112 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); 113 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); 114 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); 115 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); 116 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); 117 /* Add the working vars back into context.state[] */ 118 state[0] += a; 119 state[1] += b; 120 state[2] += c; 121 state[3] += d; 122 state[4] += e; 123 /* Wipe variables */ 124 a = b = c = d = e = 0; 125 #ifdef SHA1HANDSOFF 126 memset(block, '\0', sizeof(block)); 127 #endif 128 } 129 130 131 /* SHA1Init - Initialize new context */ 132 133 void SHA1Init(SHA1_CTX* context) 134 { 135 /* SHA1 initialization constants */ 136 context->state[0] = 0x67452301; 137 context->state[1] = 0xEFCDAB89; 138 context->state[2] = 0x98BADCFE; 139 context->state[3] = 0x10325476; 140 context->state[4] = 0xC3D2E1F0; 141 context->count[0] = context->count[1] = 0; 142 } 143 144 145 /* Run your data through this. */ 146 147 void SHA1Update(SHA1_CTX* context, const unsigned char* data, uint32_t len) 148 { 149 uint32_t i; 150 uint32_t j; 151 152 j = context->count[0]; 153 if ((context->count[0] += len << 3) < j) 154 context->count[1]++; 155 context->count[1] += (len>>29); 156 j = (j >> 3) & 63; 157 if ((j + len) > 63) { 158 memcpy(&context->buffer[j], data, (i = 64-j)); 159 SHA1Transform(context->state, context->buffer); 160 for ( ; i + 63 < len; i += 64) { 161 SHA1Transform(context->state, &data[i]); 162 } 163 j = 0; 164 } 165 else i = 0; 166 memcpy(&context->buffer[j], &data[i], len - i); 167 } 168 169 170 /* Add padding and return the message digest. */ 171 172 void SHA1Final(unsigned char digest[20], SHA1_CTX* context) 173 { 174 unsigned i; 175 unsigned char finalcount[8]; 176 unsigned char c; 177 178 #if 0 /* untested "improvement" by DHR */ 179 /* Convert context->count to a sequence of bytes 180 * in finalcount. Second element first, but 181 * big-endian order within element. 182 * But we do it all backwards. 183 */ 184 unsigned char *fcp = &finalcount[8]; 185 186 for (i = 0; i < 2; i++) 187 { 188 uint32_t t = context->count[i]; 189 int j; 190 191 for (j = 0; j < 4; t >>= 8, j++) 192 *--fcp = (unsigned char) t; 193 } 194 #else 195 for (i = 0; i < 8; i++) { 196 finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)] 197 >> ((3-(i & 3)) * 8) ) & 255); /* Endian independent */ 198 } 199 #endif 200 c = 0200; 201 SHA1Update(context, &c, 1); 202 while ((context->count[0] & 504) != 448) { 203 c = 0000; 204 SHA1Update(context, &c, 1); 205 } 206 SHA1Update(context, finalcount, 8); /* Should cause a SHA1Transform() */ 207 for (i = 0; i < 20; i++) { 208 digest[i] = (unsigned char) 209 ((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255); 210 } 211 /* Wipe variables */ 212 memset(context, '\0', sizeof(*context)); 213 memset(&finalcount, '\0', sizeof(finalcount)); 214 } 215 /* ================ end of sha1.c ================ */ 216 217 #define BUFSIZE 4096 218 219 int 220 main(int argc, char **argv) 221 { 222 SHA1_CTX ctx; 223 unsigned char hash[20], buf[BUFSIZE]; 224 int i; 225 226 for(i=0;i<BUFSIZE;i++) 227 buf[i] = i; 228 229 SHA1Init(&ctx); 230 for(i=0;i<1000;i++) 231 SHA1Update(&ctx, buf, BUFSIZE); 232 SHA1Final(hash, &ctx); 233 234 printf("SHA1="); 235 for(i=0;i<20;i++) 236 printf("%02x", hash[i]); 237 printf("\n"); 238 return 0; 239 }