src/util/sha1/sha1.c

   1 /*      $OpenBSD: sha1.c,v 1.26 2015/09/11 09:18:27 guenther Exp $      */
   2
   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 #include <stdint.h>
  18 #include <string.h>
  19 #include "sha1.h"
  20
  21 #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
  22
  23 /*
  24  * blk0() and blk() perform the initial expand.
  25  * I got the idea of expanding during the round function from SSLeay
  26  */
  27 #if BYTE_ORDER == LITTLE_ENDIAN
  28 # define blk0(i) (block->l[i] = (rol(block->l[i],24)&0xFF00FF00) \
  29     |(rol(block->l[i],8)&0x00FF00FF))
  30 #else
  31 # define blk0(i) block->l[i]
  32 #endif
  33 #define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
  34     ^block->l[(i+2)&15]^block->l[i&15],1))
  35
  36 /*
  37  * (R0+R1), R2, R3, R4 are the different operations (rounds) used in SHA1
  38  */
  39 #define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);
  40 #define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
  41 #define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
  42 #define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
  43 #define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
  44
  45 typedef union {
  46         uint8_t c[64];
  47         uint32_t l[16];
  48 } CHAR64LONG16;
  49
  50 /*
  51  * Hash a single 512-bit block. This is the core of the algorithm.
  52  */
  53 void
  54 SHA1Transform(uint32_t state[5], const uint8_t buffer[SHA1_BLOCK_LENGTH])
  55 {
  56         uint32_t a, b, c, d, e;
  57         uint8_t workspace[SHA1_BLOCK_LENGTH];
  58         CHAR64LONG16 *block = (CHAR64LONG16 *)workspace;
  59
  60         (void)memcpy(block, buffer, SHA1_BLOCK_LENGTH);
  61
  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
  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
  91         /* Add the working vars back into context.state[] */
  92         state[0] += a;
  93         state[1] += b;
  94         state[2] += c;
  95         state[3] += d;
  96         state[4] += e;
  97
  98         /* Wipe variables */
  99         a = b = c = d = e = 0;
 100 }
 101
 102
 103 /*
 104  * SHA1Init - Initialize new context
 105  */
 106 void
 107 SHA1Init(SHA1_CTX *context)
 108 {
 109
 110         /* SHA1 initialization constants */
 111         context->count = 0;
 112         context->state[0] = 0x67452301;
 113         context->state[1] = 0xEFCDAB89;
 114         context->state[2] = 0x98BADCFE;
 115         context->state[3] = 0x10325476;
 116         context->state[4] = 0xC3D2E1F0;
 117 }
 118
 119
 120 /*
 121  * Run your data through this.
 122  */
 123 void
 124 SHA1Update(SHA1_CTX *context, const uint8_t *data, size_t len)
 125 {
 126         size_t i, j;
 127
 128         j = (size_t)((context->count >> 3) & 63);
 129         context->count += (len << 3);
 130         if ((j + len) > 63) {
 131                 (void)memcpy(&context->buffer[j], data, (i = 64-j));
 132                 SHA1Transform(context->state, context->buffer);
 133                 for ( ; i + 63 < len; i += 64)
 134                         SHA1Transform(context->state, (uint8_t *)&data[i]);
 135                 j = 0;
 136         } else {
 137                 i = 0;
 138         }
 139         (void)memcpy(&context->buffer[j], &data[i], len - i);
 140 }
 141
 142
 143 /*
 144  * Add padding and return the message digest.
 145  */
 146 void
 147 SHA1Pad(SHA1_CTX *context)
 148 {
 149         uint8_t finalcount[8];
 150         uint32_t i;
 151
 152         for (i = 0; i < 8; i++) {
 153                 finalcount[i] = (uint8_t)((context->count >>
 154                     ((7 - (i & 7)) * 8)) & 255);        /* Endian independent */
 155         }
 156         SHA1Update(context, (uint8_t *)"\200", 1);
 157         while ((context->count & 504) != 448)
 158                 SHA1Update(context, (uint8_t *)"\0", 1);
 159         SHA1Update(context, finalcount, 8); /* Should cause a SHA1Transform() */
 160 }
 161
 162 void
 163 SHA1Final(uint8_t digest[SHA1_DIGEST_LENGTH], SHA1_CTX *context)
 164 {
 165         uint32_t i;
 166
 167         SHA1Pad(context);
 168         for (i = 0; i < SHA1_DIGEST_LENGTH; i++) {
 169                 digest[i] = (uint8_t)
 170                    ((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
 171         }
 172         memset(context, 0, sizeof(*context));
 173 }