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 "u_endian.h"
  20 #include "sha1.h"
  21
  22 #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
  23
  24 /*
  25  * blk0() and blk() perform the initial expand.
  26  * I got the idea of expanding during the round function from SSLeay
  27  */
  28 #if PIPE_ARCH_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 /*
  38  * (R0+R1), R2, R3, R4 are the different operations (rounds) used in SHA1
  39  */
  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 typedef union {
  47         uint8_t c[64];
  48         uint32_t l[16];
  49 } CHAR64LONG16;
  50
  51 /*
  52  * Hash a single 512-bit block. This is the core of the algorithm.
  53  */
  54 void
  55 SHA1Transform(uint32_t state[5], const uint8_t buffer[SHA1_BLOCK_LENGTH])
  56 {
  57         uint32_t a, b, c, d, e;
  58         uint8_t workspace[SHA1_BLOCK_LENGTH];
  59         CHAR64LONG16 *block = (CHAR64LONG16 *)workspace;
  60
  61         (void)memcpy(block, buffer, SHA1_BLOCK_LENGTH);
  62
  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
  99         /* Wipe variables */
 100         a = b = c = d = e = 0;
 101 }
 102
 103
 104 /*
 105  * SHA1Init - Initialize new context
 106  */
 107 void
 108 SHA1Init(SHA1_CTX *context)
 109 {
 110
 111         /* SHA1 initialization constants */
 112         context->count = 0;
 113         context->state[0] = 0x67452301;
 114         context->state[1] = 0xEFCDAB89;
 115         context->state[2] = 0x98BADCFE;
 116         context->state[3] = 0x10325476;
 117         context->state[4] = 0xC3D2E1F0;
 118 }
 119
 120
 121 /*
 122  * Run your data through this.
 123  */
 124 void
 125 SHA1Update(SHA1_CTX *context, const uint8_t *data, size_t len)
 126 {
 127         size_t i, j;
 128
 129         j = (size_t)((context->count >> 3) & 63);
 130         context->count += (len << 3);
 131         if ((j + len) > 63) {
 132                 (void)memcpy(&context->buffer[j], data, (i = 64-j));
 133                 SHA1Transform(context->state, context->buffer);
 134                 for ( ; i + 63 < len; i += 64)
 135                         SHA1Transform(context->state, (uint8_t *)&data[i]);
 136                 j = 0;
 137         } else {
 138                 i = 0;
 139         }
 140         (void)memcpy(&context->buffer[j], &data[i], len - i);
 141 }
 142
 143
 144 /*
 145  * Add padding and return the message digest.
 146  */
 147 void
 148 SHA1Pad(SHA1_CTX *context)
 149 {
 150         uint8_t finalcount[8];
 151         uint32_t i;
 152
 153         for (i = 0; i < 8; i++) {
 154                 finalcount[i] = (uint8_t)((context->count >>
 155                     ((7 - (i & 7)) * 8)) & 255);        /* Endian independent */
 156         }
 157         SHA1Update(context, (uint8_t *)"\200", 1);
 158         while ((context->count & 504) != 448)
 159                 SHA1Update(context, (uint8_t *)"\0", 1);
 160         SHA1Update(context, finalcount, 8); /* Should cause a SHA1Transform() */
 161 }
 162
 163 void
 164 SHA1Final(uint8_t digest[SHA1_DIGEST_LENGTH], SHA1_CTX *context)
 165 {
 166         uint32_t i;
 167
 168         SHA1Pad(context);
 169         for (i = 0; i < SHA1_DIGEST_LENGTH; i++) {
 170                 digest[i] = (uint8_t)
 171                    ((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
 172         }
 173         memset(context, 0, sizeof(*context));
 174 }