1 /* 2 * ftp://ftp.funet.fi/pub/crypt/hash/sha/sha1.c 3 * 4 * SHA-1 in C 5 * By Steve Reid <steve (at) 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 SHA1HANDSOFF * Copies data before messing with it. */ 18 19 #include <string.h> 20 #include <netinet/in.h> /* htonl() */ 21 #include <net/ppp_defs.h> 22 #include "sha1.h" 23 24 static void 25 SHA1_Transform(u_int32_t[5], const unsigned char[64]); 26 27 #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits)))) 28 29 /* blk0() and blk() perform the initial expand. */ 30 /* I got the idea of expanding during the round function from SSLeay */ 31 #define blk0(i) (block->l[i] = htonl(block->l[i])) 32 #define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \ 33 ^block->l[(i+2)&15]^block->l[i&15],1)) 34 35 /* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */ 36 #define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30); 37 #define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30); 38 #define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30); 39 #define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30); 40 #define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30); 41 42 43 /* Hash a single 512-bit block. This is the core of the algorithm. */ 44 45 static void 46 SHA1_Transform(u_int32_t state[5], const unsigned char buffer[64]) 47 { 48 u_int32_t a, b, c, d, e; 49 typedef union { 50 unsigned char c[64]; 51 u_int32_t l[16]; 52 } CHAR64LONG16; 53 CHAR64LONG16 *block; 54 55 #ifdef SHA1HANDSOFF 56 static unsigned char workspace[64]; 57 block = (CHAR64LONG16 *) workspace; 58 memcpy(block, buffer, 64); 59 #else 60 block = (CHAR64LONG16 *) buffer; 61 #endif 62 /* Copy context->state[] to working vars */ 63 a = state[0]; 64 b = state[1]; 65 c = state[2]; 66 d = state[3]; 67 e = state[4]; 68 /* 4 rounds of 20 operations each. Loop unrolled. */ 69 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); 70 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); 71 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); 72 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); 73 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); 74 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); 75 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); 76 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); 77 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); 78 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); 79 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); 80 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); 81 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); 82 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); 83 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); 84 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); 85 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); 86 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); 87 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); 88 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); 89 /* Add the working vars back into context.state[] */ 90 state[0] += a; 91 state[1] += b; 92 state[2] += c; 93 state[3] += d; 94 state[4] += e; 95 /* Wipe variables */ 96 a = b = c = d = e = 0; 97 } 98 99 100 /* SHA1Init - Initialize new context */ 101 102 void 103 SHA1_Init(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 118 SHA1_Update(SHA1_CTX *context, const unsigned char *data, unsigned int len) 119 { 120 unsigned int i, j; 121 122 j = (context->count[0] >> 3) & 63; 123 if ((context->count[0] += len << 3) < (len << 3)) context->count[1]++; 124 context->count[1] += (len >> 29); 125 i = 64 - j; 126 while (len >= i) { 127 memcpy(&context->buffer[j], data, i); 128 SHA1_Transform(context->state, context->buffer); 129 data += i; 130 len -= i; 131 i = 64; 132 j = 0; 133 } 134 135 memcpy(&context->buffer[j], data, len); 136 } 137 138 139 /* Add padding and return the message digest. */ 140 141 void 142 SHA1_Final(unsigned char digest[20], SHA1_CTX *context) 143 { 144 u_int32_t i, j; 145 unsigned char finalcount[8]; 146 147 for (i = 0; i < 8; i++) { 148 finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)] 149 >> ((3-(i & 3)) * 8) ) & 255); /* Endian independent */ 150 } 151 SHA1_Update(context, (unsigned char *) "\200", 1); 152 while ((context->count[0] & 504) != 448) { 153 SHA1_Update(context, (unsigned char *) "\0", 1); 154 } 155 SHA1_Update(context, finalcount, 8); /* Should cause a SHA1Transform() */ 156 for (i = 0; i < 20; i++) { 157 digest[i] = (unsigned char) 158 ((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255); 159 } 160 /* Wipe variables */ 161 i = j = 0; 162 memset(context->buffer, 0, 64); 163 memset(context->state, 0, 20); 164 memset(context->count, 0, 8); 165 memset(&finalcount, 0, 8); 166 #ifdef SHA1HANDSOFF /* make SHA1Transform overwrite it's own static vars */ 167 SHA1Transform(context->state, context->buffer); 168 #endif 169 } 170 171
