228 lines
5.7 KiB
C
228 lines
5.7 KiB
C
/*
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* $Log: sha.c,v $
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* Revision 1.3 2003/01/16 18:18:56 josh
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* directory structure shifting
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*
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* Revision 1.2 2001/11/06 22:15:53 tneale
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* Fixed for newest file layout
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*
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* Revision 1.1.1.1 2001/11/05 17:48:39 tneale
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* Tornado shuffle
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*
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* Revision 1.4 2001/01/19 22:21:31 paul
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* Update copyright.
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*
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* Revision 1.3 2000/03/17 00:16:56 meister
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* Update copyright message
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*
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* Revision 1.2 1998/06/16 05:12:26 sar
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* Clean up some type questions
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*
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* Revision 1.1 1998/05/22 18:03:35 sar
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* SHA digest functions
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*
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*/
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/* [clearcase]
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modification history
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-------------------
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01b,20apr05,job update copyright notices
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01a,11dec03,job fix copyright statements
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*/
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/* NIST Secure Hash Algorithm */
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/* heavily modified by Uwe Hollerbach <uh@alumni.caltech edu> */
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/* from Peter C. Gutmann's implementation as found in */
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/* Applied Cryptography by Bruce Schneier */
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/* Further modifications to include the "UNRAVEL" stuff, below */
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/* This code is in the public domain */
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#include <wrn/wm/common/install.h>
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#include <wrn/wm/common/types.h>
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#include <wrn/wm/common/config.h>
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#include <wrn/wm/common/glue.h>
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#include <wrn/wm/common/sha.h>
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/* Always use version 1, but leave the code around in case
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somebody wants to know that the difference is */
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#define SHA_VERSION 1
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/* SHA f()-functions */
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#define f1(x,y,z) ((x & y) | (~x & z))
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#define f2(x,y,z) (x ^ y ^ z)
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#define f3(x,y,z) ((x & y) | (x & z) | (y & z))
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#define f4(x,y,z) (x ^ y ^ z)
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/* SHA constants */
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#define CONST1 0x5a827999L
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#define CONST2 0x6ed9eba1L
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#define CONST3 0x8f1bbcdcL
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#define CONST4 0xca62c1d6L
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/* 32-bit rotate */
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#define R32(x,n) ((x << n) | (x >> (32 - n)))
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#define FG(n) \
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T = R32(A,5) + f##n(B,C,D) + E + *WP++ + CONST##n; \
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E = D; D = C; C = R32(B,30); B = A; A = T
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/* do SHA transformation */
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static void sha_transform (SHA_CTX *sha_info)
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{
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int i;
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bits8_t *dp;
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bits32_t T, A, B, C, D, E, W[80], *WP;
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dp = sha_info->data;
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#if (INSTALL_ON_LITTLE_ENDIAN)
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for (i = 0; i < 16; ++i)
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{
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T = *((bits32_t *) dp);
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dp += 4;
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W[i] = ((T << 24) & 0xff000000L) | ((T << 8) & 0x00ff0000L) |
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((T >> 8) & 0x0000ff00) | ((T >> 24) & 0x000000ff);
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}
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#endif /* #if (INSTALL_ON_LITTLE_ENDIAN) */
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#if (INSTALL_ON_BIG_ENDIAN)
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for (i = 0; i < 16; ++i)
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{
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T = *((bits32_t *) dp);
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dp += 4;
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W[i] = T;
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}
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#endif /* #if (INSTALL_ON_BIG_ENDIAN) **/
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for (i = 16; i < 80; ++i)
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{
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W[i] = W[i-3] ^ W[i-8] ^ W[i-14] ^ W[i-16];
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#if (SHA_VERSION == 1)
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W[i] = R32(W[i], 1);
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#endif /* SHA_VERSION */
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}
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A = sha_info->buf[0];
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B = sha_info->buf[1];
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C = sha_info->buf[2];
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D = sha_info->buf[3];
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E = sha_info->buf[4];
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WP = W;
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for (i = 0; i < 20; ++i) { FG(1); }
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for (i = 20; i < 40; ++i) { FG(2); }
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for (i = 40; i < 60; ++i) { FG(3); }
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for (i = 60; i < 80; ++i) { FG(4); }
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sha_info->buf[0] += A;
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sha_info->buf[1] += B;
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sha_info->buf[2] += C;
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sha_info->buf[3] += D;
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sha_info->buf[4] += E;
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}
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/* initialize the SHA digest */
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void sha_init(SHA_CTX *sha_info)
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{
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sha_info->buf[0] = 0x67452301L;
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sha_info->buf[1] = 0xefcdab89L;
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sha_info->buf[2] = 0x98badcfeL;
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sha_info->buf[3] = 0x10325476L;
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sha_info->buf[4] = 0xc3d2e1f0L;
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sha_info->count_lo = 0L;
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sha_info->count_hi = 0L;
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sha_info->local = 0;
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}
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/* update the SHA digest */
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void sha_update(SHA_CTX *sha_info,
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bits8_t *buffer,
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bits32_t count)
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{
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bits32_t clo;
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size_t i;
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clo = sha_info->count_lo + ((bits32_t) count << 3);
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if (clo < sha_info->count_lo) {
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++sha_info->count_hi;
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}
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sha_info->count_lo = clo;
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sha_info->count_hi += (bits32_t) count >> 29;
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if (sha_info->local)
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{
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i = SHA_BLOCKSIZE - sha_info->local;
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if (i > count)
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i = (size_t)count;
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MEMCPY(sha_info->data + sha_info->local, buffer, i);
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count -= i;
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buffer += i;
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sha_info->local += i;
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if (sha_info->local == SHA_BLOCKSIZE)
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sha_transform(sha_info);
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else
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return;
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}
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while (count >= SHA_BLOCKSIZE)
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{ MEMCPY (sha_info->data, buffer, SHA_BLOCKSIZE);
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buffer += SHA_BLOCKSIZE;
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count -= SHA_BLOCKSIZE;
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sha_transform (sha_info);
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}
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if (count) {
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MEMCPY (sha_info->data, buffer, (size_t)count);
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}
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sha_info->local = (size_t)count;
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}
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/* finish computing the SHA digest */
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void sha_final (SHA_CTX *sha_info)
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{
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int count, i, ii;
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bits32_t lo_bit_count, hi_bit_count;
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lo_bit_count = sha_info->count_lo;
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hi_bit_count = sha_info->count_hi;
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count = (int) ((lo_bit_count >> 3) & 0x3f);
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((bits8_t *) sha_info->data)[count++] = 0x80;
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if (count > SHA_BLOCKSIZE - 8) {
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MEMSET(sha_info->data + count, 0, SHA_BLOCKSIZE - count);
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sha_transform(sha_info);
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MEMSET(sha_info->data, 0, SHA_BLOCKSIZE - 8);
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} else {
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MEMSET(sha_info->data + count, 0, SHA_BLOCKSIZE - 8 - count);
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}
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sha_info->data[56] = (bits8_t) ((hi_bit_count >> 24) & 0xffL);
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sha_info->data[57] = (bits8_t) ((hi_bit_count >> 16) & 0xffL);
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sha_info->data[58] = (bits8_t) ((hi_bit_count >> 8) & 0xffL);
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sha_info->data[59] = (bits8_t) ((hi_bit_count ) & 0xffL);
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sha_info->data[60] = (bits8_t) ((lo_bit_count >> 24) & 0xffL);
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sha_info->data[61] = (bits8_t) ((lo_bit_count >> 16) & 0xffL);
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sha_info->data[62] = (bits8_t) ((lo_bit_count >> 8) & 0xffL);
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sha_info->data[63] = (bits8_t) ((lo_bit_count ) & 0xffL);
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sha_transform(sha_info);
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/* store buffer in digest */
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for(i = 0, ii = 0; i < 5; i++, ii += 4) {
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sha_info->digest[ii] = (bits8_t)((sha_info->buf[i] >> 24) & 0xFF);
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sha_info->digest[ii+1] = (bits8_t)((sha_info->buf[i] >> 16) & 0xFF);
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sha_info->digest[ii+2] = (bits8_t)((sha_info->buf[i] >> 8) & 0xFF);
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sha_info->digest[ii+3] = (bits8_t)((sha_info->buf[i]) & 0xFF);
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}
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}
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