1 /* 2 * modified for ldns by Jelte Jansen, original taken from OpenBSD: 3 * 4 * SHA-1 in C 5 * By Steve Reid <steve@edmweb.com> 6 * 100% Public Domain 7 * 8 * Test Vectors (from FIPS PUB 180-1) 9 * "abc" 10 * A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D 11 * "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq" 12 * 84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1 13 * A million repetitions of "a" 14 * 34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F 15 */ 16 17 /* #define LITTLE_ENDIAN * This should be #define'd already, if true. */ 18 19 #include <ldns/config.h> 20 #include <ldns/ldns.h> 21 #include <strings.h> 22 23 #define SHA1HANDSOFF 1 /* Copies data before messing with it. */ 24 #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits)))) 25 26 /* blk0() and blk() perform the initial expand. */ 27 /* I got the idea of expanding during the round function from SSLeay */ 28 #if BYTE_ORDER == LITTLE_ENDIAN 29 #define blk0(i) (block->l[i] = (rol(block->l[i],24)&0xFF00FF00) \ 30 |(rol(block->l[i],8)&0x00FF00FF)) 31 #else 32 #define blk0(i) block->l[i] 33 #endif 34 #define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \ 35 ^block->l[(i+2)&15]^block->l[i&15],1)) 36 37 /* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */ 38 #define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30); 39 #define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30); 40 #define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30); 41 #define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30); 42 #define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30); 43 44 /* Hash a single 512-bit block. This is the core of the algorithm. */ 45 46 void 47 ldns_sha1_transform(uint32_t state[5], const unsigned char buffer[LDNS_SHA1_BLOCK_LENGTH]) 48 { 49 uint32_t a, b, c, d, e; 50 typedef union { 51 unsigned char c[64]; 52 unsigned int l[16]; 53 } CHAR64LONG16; 54 CHAR64LONG16* block; 55 #ifdef SHA1HANDSOFF 56 unsigned char workspace[LDNS_SHA1_BLOCK_LENGTH]; 57 58 block = (CHAR64LONG16 *)workspace; 59 memmove(block, buffer, LDNS_SHA1_BLOCK_LENGTH); 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 70 /* 4 rounds of 20 operations each. Loop unrolled. */ 71 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); 72 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); 73 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); 74 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); 75 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); 76 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); 77 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); 78 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); 79 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); 80 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); 81 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); 82 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); 83 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); 84 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); 85 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); 86 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); 87 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); 88 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); 89 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); 90 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); 91 92 /* Add the working vars back into context.state[] */ 93 state[0] += a; 94 state[1] += b; 95 state[2] += c; 96 state[3] += d; 97 state[4] += e; 98 /* Wipe variables */ 99 a = b = c = d = e = 0; 100 (void)a; 101 } 102 103 104 /* SHA1Init - Initialize new context */ 105 106 void 107 ldns_sha1_init(ldns_sha1_ctx *context) 108 { 109 /* SHA1 initialization constants */ 110 context->count = 0; 111 context->state[0] = 0x67452301; 112 context->state[1] = 0xEFCDAB89; 113 context->state[2] = 0x98BADCFE; 114 context->state[3] = 0x10325476; 115 context->state[4] = 0xC3D2E1F0; 116 } 117 118 119 /* Run your data through this. */ 120 121 void 122 ldns_sha1_update(ldns_sha1_ctx *context, const unsigned char *data, unsigned int len) 123 { 124 unsigned int i; 125 unsigned int j; 126 127 j = (unsigned)(uint32_t)((context->count >> 3) & 63); 128 context->count += (len << 3); 129 if ((j + len) > 63) { 130 memmove(&context->buffer[j], data, (i = 64 - j)); 131 ldns_sha1_transform(context->state, context->buffer); 132 for ( ; i + 63 < len; i += 64) { 133 ldns_sha1_transform(context->state, &data[i]); 134 } 135 j = 0; 136 } 137 else i = 0; 138 memmove(&context->buffer[j], &data[i], len - i); 139 } 140 141 142 /* Add padding and return the message digest. */ 143 144 void 145 ldns_sha1_final(unsigned char digest[LDNS_SHA1_DIGEST_LENGTH], ldns_sha1_ctx *context) 146 { 147 unsigned int i; 148 unsigned char finalcount[8]; 149 150 for (i = 0; i < 8; i++) { 151 finalcount[i] = (unsigned char)((context->count >> 152 ((7 - (i & 7)) * 8)) & 255); /* Endian independent */ 153 } 154 ldns_sha1_update(context, (unsigned char *)"\200", 1); 155 while ((context->count & 504) != 448) { 156 ldns_sha1_update(context, (unsigned char *)"\0", 1); 157 } 158 ldns_sha1_update(context, finalcount, 8); /* Should cause a SHA1Transform() */ 159 160 if (digest != NULL) 161 for (i = 0; i < LDNS_SHA1_DIGEST_LENGTH; i++) { 162 digest[i] = (unsigned char)((context->state[i >> 2] >> 163 ((3 - (i & 3)) * 8)) & 255); 164 } 165 #ifdef SHA1HANDSOFF /* make SHA1Transform overwrite its own static vars */ 166 ldns_sha1_transform(context->state, context->buffer); 167 #endif 168 } 169 170 unsigned char * 171 ldns_sha1(const unsigned char *data, unsigned int data_len, unsigned char *digest) 172 { 173 ldns_sha1_ctx ctx; 174 ldns_sha1_init(&ctx); 175 ldns_sha1_update(&ctx, data, data_len); 176 ldns_sha1_final(digest, &ctx); 177 return digest; 178 } 179