src/sha1.c

   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 <sys/types.h>  /* for u_int*_t */
  27 #if defined(__sun)
  28 #include "solarisfixes.h"
  29 #endif
  30 #include "sha1.h"
  31 #include "config.h"
  32
  33 #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
  34
  35 /* blk0() and blk() perform the initial expand. */
  36 /* I got the idea of expanding during the round function from SSLeay */
  37 #if BYTE_ORDER == LITTLE_ENDIAN
  38 #define blk0(i) (block->l[i] = (rol(block->l[i],24)&0xFF00FF00) \
  39     |(rol(block->l[i],8)&0x00FF00FF))
  40 #elif BYTE_ORDER == BIG_ENDIAN
  41 #define blk0(i) block->l[i]
  42 #else
  43 #error "Endianness not defined!"
  44 #endif
  45 #define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
  46     ^block->l[(i+2)&15]^block->l[i&15],1))
  47
  48 /* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */
  49 #define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);
  50 #define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
  51 #define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
  52 #define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
  53 #define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
  54
  55
  56 /* Hash a single 512-bit block. This is the core of the algorithm. */
  57
  58 void SHA1Transform(u_int32_t state[5], const unsigned char buffer[64])
  59 {
  60 u_int32_t a, b, c, d, e;
  61 typedef union {
  62     unsigned char c[64];
  63     u_int32_t l[16];
  64 } CHAR64LONG16;
  65 #ifdef SHA1HANDSOFF
  66 CHAR64LONG16 block[1];  /* use array to appear as a pointer */
  67     memcpy(block, buffer, 64);
  68 #else
  69     /* The following had better never be used because it causes the
  70      * pointer-to-const buffer to be cast into a pointer to non-const.
  71      * And the result is written through.  I threw a "const" in, hoping
  72      * this will cause a diagnostic.
  73      */
  74 CHAR64LONG16* block = (const CHAR64LONG16*)buffer;
  75 #endif
  76     /* Copy context->state[] to working vars */
  77     a = state[0];
  78     b = state[1];
  79     c = state[2];
  80     d = state[3];
  81     e = state[4];
  82     /* 4 rounds of 20 operations each. Loop unrolled. */
  83     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);
  84     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);
  85     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);
  86     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);
  87     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);
  88     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);
  89     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);
  90     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);
  91     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);
  92     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);
  93     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);
  94     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);
  95     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);
  96     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);
  97     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);
  98     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);
  99     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);
 100     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);
 101     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);
 102     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);
 103     /* Add the working vars back into context.state[] */
 104     state[0] += a;
 105     state[1] += b;
 106     state[2] += c;
 107     state[3] += d;
 108     state[4] += e;
 109     /* Wipe variables */
 110     a = b = c = d = e = 0;
 111 #ifdef SHA1HANDSOFF
 112     memset(block, '\0', sizeof(block));
 113 #endif
 114 }
 115
 116
 117 /* SHA1Init - Initialize new context */
 118
 119 void SHA1Init(SHA1_CTX* context)
 120 {
 121     /* SHA1 initialization constants */
 122     context->state[0] = 0x67452301;
 123     context->state[1] = 0xEFCDAB89;
 124     context->state[2] = 0x98BADCFE;
 125     context->state[3] = 0x10325476;
 126     context->state[4] = 0xC3D2E1F0;
 127     context->count[0] = context->count[1] = 0;
 128 }
 129
 130
 131 /* Run your data through this. */
 132
 133 void SHA1Update(SHA1_CTX* context, const unsigned char* data, u_int32_t len)
 134 {
 135 u_int32_t i;
 136 u_int32_t j;
 137
 138     j = context->count[0];
 139     if ((context->count[0] += len << 3) < j)
 140         context->count[1]++;
 141     context->count[1] += (len>>29);
 142     j = (j >> 3) & 63;
 143     if ((j + len) > 63) {
 144         memcpy(&context->buffer[j], data, (i = 64-j));
 145         SHA1Transform(context->state, context->buffer);
 146         for ( ; i + 63 < len; i += 64) {
 147             SHA1Transform(context->state, &data[i]);
 148         }
 149         j = 0;
 150     }
 151     else i = 0;
 152     memcpy(&context->buffer[j], &data[i], len - i);
 153 }
 154
 155
 156 /* Add padding and return the message digest. */
 157
 158 void SHA1Final(unsigned char digest[20], SHA1_CTX* context)
 159 {
 160 unsigned i;
 161 unsigned char finalcount[8];
 162 unsigned char c;
 163
 164 #if 0   /* untested "improvement" by DHR */
 165     /* Convert context->count to a sequence of bytes
 166      * in finalcount.  Second element first, but
 167      * big-endian order within element.
 168      * But we do it all backwards.
 169      */
 170     unsigned char *fcp = &finalcount[8];
 171
 172     for (i = 0; i < 2; i++)
 173     {
 174         u_int32_t t = context->count[i];
 175         int j;
 176
 177         for (j = 0; j < 4; t >>= 8, j++)
 178             *--fcp = (unsigned char) t
 179     }
 180 #else
 181     for (i = 0; i < 8; i++) {
 182         finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)]
 183          >> ((3-(i & 3)) * 8) ) & 255);  /* Endian independent */
 184     }
 185 #endif
 186     c = 0200;
 187     SHA1Update(context, &c, 1);
 188     while ((context->count[0] & 504) != 448) {
 189         c = 0000;
 190         SHA1Update(context, &c, 1);
 191     }
 192     SHA1Update(context, finalcount, 8);  /* Should cause a SHA1Transform() */
 193     for (i = 0; i < 20; i++) {
 194         digest[i] = (unsigned char)
 195          ((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
 196     }
 197     /* Wipe variables */
 198     memset(context, '\0', sizeof(*context));
 199     memset(&finalcount, '\0', sizeof(finalcount));
 200 }
 201 /* ================ end of sha1.c ================ */
 202
 203 #if 0
 204 #define BUFSIZE 4096
 205
 206 int
 207 main(int argc, char **argv)
 208 {
 209     SHA1_CTX ctx;
 210     unsigned char hash[20], buf[BUFSIZE];
 211     int i;
 212
 213     for(i=0;i<BUFSIZE;i++)
 214         buf[i] = i;
 215
 216     SHA1Init(&ctx);
 217     for(i=0;i<1000;i++)
 218         SHA1Update(&ctx, buf, BUFSIZE);
 219     SHA1Final(hash, &ctx);
 220
 221     printf("SHA1=");
 222     for(i=0;i<20;i++)
 223         printf("%02x", hash[i]);
 224     printf("\n");
 225     return 0;
 226 }
 227
 228 #endif