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234 lines
6.5 KiB
C
234 lines
6.5 KiB
C
/*
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sha1.c: Implementation of SHA-1 Secure Hash Algorithm-1
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Based upon: NIST FIPS180-1 Secure Hash Algorithm-1
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http://www.itl.nist.gov/fipspubs/fip180-1.htm
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Non-official Japanese Translation by HIRATA Yasuyuki:
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http://yasu.asuka.net/translations/SHA-1.html
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Copyright (C) 2002 vi@nwr.jp. All rights reserved.
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgement in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as beging the original software.
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3. This notice may not be removed or altered from any source distribution.
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Note:
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The copyright notice above is copied from md5.h by L. Peter Deutsch
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<ghost@aladdin.com>. Thank him since I'm not a good speaker of English. :)
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*/
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#include <string.h>
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#include "sha1.h"
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/*
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* Packing bytes to a word
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*
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* Should not assume p is aligned to word boundary
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*/
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static sha1_word_t packup(sha1_byte_t *p)
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{
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/* Portable, but slow */
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return p[0] << 24 | p[1] << 16 | p[2] << 8 | p[3] << 0;
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}
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/*
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* Unpacking a word to bytes
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*
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* Should not assume p is aligned to word boundary
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*/
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static void unpackup(sha1_byte_t *p, sha1_word_t q)
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{
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p[0] = (q >> 24) & 0xff;
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p[1] = (q >> 16) & 0xff;
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p[2] = (q >> 8) & 0xff;
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p[3] = (q >> 0) & 0xff;
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}
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/*
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* Processing a block
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*/
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static void sha1_update_now(sha1_state_s *pms, sha1_byte_t *bp)
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{
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sha1_word_t tmp, a, b, c, d, e, w[16+16];
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int i, s;
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/* pack 64 bytes into 16 words */
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for(i = 0; i < 16; i++) {
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w[i] = packup(bp + i * sizeof(sha1_word_t));
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}
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memcpy(w + 16, w + 0, sizeof(sha1_word_t) * 16);
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a = pms->sha1_h[0], b = pms->sha1_h[1], c = pms->sha1_h[2], d = pms->sha1_h[3], e = pms->sha1_h[4];
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#define rot(x,n) (((x) << n) | ((x) >> (32-n)))
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#define f0(b, c, d) ((b&c)|(~b&d))
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#define f1(b, c, d) (b^c^d)
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#define f2(b, c, d) ((b&c)|(b&d)|(c&d))
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#define f3(b, c, d) (b^c^d)
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#define k0 0x5a827999
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#define k1 0x6ed9eba1
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#define k2 0x8f1bbcdc
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#define k3 0xca62c1d6
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/* t=0-15 */
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s = 0;
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for(i = 0; i < 16; i++) {
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tmp = rot(a, 5) + f0(b, c, d) + e + w[s] + k0;
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e = d; d = c; c = rot(b, 30); b = a; a = tmp;
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s = (s + 1) % 16;
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}
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/* t=16-19 */
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for(i = 16; i < 20; i++) {
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w[s] = rot(w[s+13] ^ w[s+8] ^ w[s+2] ^ w[s], 1);
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w[s+16] = w[s];
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tmp = rot(a, 5) + f0(b, c, d) + e + w[s] + k0;
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e = d; d = c; c = rot(b, 30); b = a; a = tmp;
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s = (s + 1) % 16;
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}
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/* t=20-39 */
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for(i = 0; i < 20; i++) {
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w[s] = rot(w[s+13] ^ w[s+8] ^ w[s+2] ^ w[s], 1);
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w[s+16] = w[s];
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tmp = rot(a, 5) + f1(b, c, d) + e + w[s] + k1;
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e = d; d = c; c = rot(b, 30); b = a; a = tmp;
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s = (s + 1) % 16;
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}
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/* t=40-59 */
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for(i = 0; i < 20; i++) {
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w[s] = rot(w[s+13] ^ w[s+8] ^ w[s+2] ^ w[s], 1);
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w[s+16] = w[s];
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tmp = rot(a, 5) + f2(b, c, d) + e + w[s] + k2;
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e = d; d = c; c = rot(b, 30); b = a; a = tmp;
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s = (s + 1) % 16;
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}
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/* t=60-79 */
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for(i = 0; i < 20; i++) {
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w[s] = rot(w[s+13] ^ w[s+8] ^ w[s+2] ^ w[s], 1);
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w[s+16] = w[s];
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tmp = rot(a, 5) + f3(b, c, d) + e + w[s] + k3;
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e = d; d = c; c = rot(b, 30); b = a; a = tmp;
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s = (s + 1) % 16;
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}
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pms->sha1_h[0] += a, pms->sha1_h[1] += b, pms->sha1_h[2] += c, pms->sha1_h[3] += d, pms->sha1_h[4] += e;
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}
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/*
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* Increment sha1_size1, sha1_size2 field of sha1_state_s
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*/
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static void incr(sha1_state_s *pms, int v)
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{
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sha1_word_t q;
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q = pms->sha1_size1 + v * BITS;
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if(q < pms->sha1_size1) {
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pms->sha1_size2++;
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}
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pms->sha1_size1 = q;
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}
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/*
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* Initialize sha1_state_s as FIPS specifies
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*/
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void sha1_init(sha1_state_s *pms)
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{
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memset(pms, 0, sizeof(*pms));
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pms->sha1_h[0] = 0x67452301; /* Initialize H[0]-H[4] */
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pms->sha1_h[1] = 0xEFCDAB89;
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pms->sha1_h[2] = 0x98BADCFE;
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pms->sha1_h[3] = 0x10325476;
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pms->sha1_h[4] = 0xC3D2E1F0;
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}
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/*
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* Fill block and update output when needed
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*/
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void sha1_update(sha1_state_s *pms, sha1_byte_t *bufp, int length)
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{
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/* Is the buffer partially filled? */
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if(pms->sha1_count != 0) {
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if(pms->sha1_count + length >= (signed) sizeof(pms->sha1_buf)) { /* buffer is filled enough */
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int fil = sizeof(pms->sha1_buf) - pms->sha1_count; /* length to copy */
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memcpy(pms->sha1_buf + pms->sha1_count, bufp, fil);
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sha1_update_now(pms, pms->sha1_buf);
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length -= fil;
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bufp += fil;
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pms->sha1_count = 0;
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incr(pms, fil);
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} else {
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memcpy(pms->sha1_buf + pms->sha1_count, bufp, length);
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pms->sha1_count += length;
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incr(pms, length);
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return;
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}
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}
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/* Loop to update state */
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for(;;) {
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if(length < (signed) sizeof(pms->sha1_buf)) { /* Short to fill up the buffer */
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if(length) {
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memcpy(pms->sha1_buf, bufp, length);
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}
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pms->sha1_count = length;
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incr(pms, length);
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break;
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}
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sha1_update_now(pms, bufp);
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length -= sizeof(pms->sha1_buf);
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bufp += sizeof(pms->sha1_buf);
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incr(pms, sizeof(pms->sha1_buf));
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}
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}
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void sha1_finish(sha1_state_s *pms, sha1_byte_t output[SHA1_OUTPUT_SIZE])
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{
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int i;
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sha1_byte_t buf[1];
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/* fill a bit */
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buf[0] = 0x80;
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sha1_update(pms, buf, 1);
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/* Decrement sha1_size1, sha1_size2 */
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if((pms->sha1_size1 -= BITS) == 0) {
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pms->sha1_size2--;
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}
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/* fill zeros */
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if(pms->sha1_count > (signed) (sizeof(pms->sha1_buf) - 2 * sizeof(sha1_word_t))) {
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memset(pms->sha1_buf + pms->sha1_count, 0, sizeof(pms->sha1_buf) - pms->sha1_count);
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sha1_update_now(pms, pms->sha1_buf);
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pms->sha1_count = 0;
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}
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memset(pms->sha1_buf + pms->sha1_count, 0,
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sizeof(pms->sha1_buf) - pms->sha1_count - sizeof(sha1_word_t) * 2);
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/* fill last length */
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unpackup(pms->sha1_buf + sizeof(pms->sha1_buf) - sizeof(sha1_word_t) * 2, pms->sha1_size2);
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unpackup(pms->sha1_buf + sizeof(pms->sha1_buf) - sizeof(sha1_word_t) * 1, pms->sha1_size1);
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/* final update */
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sha1_update_now(pms, pms->sha1_buf);
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/* move hash value to output byte array */
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for(i = 0; i < (signed) (sizeof(pms->sha1_h)/sizeof(sha1_word_t)); i++) {
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unpackup(output + i * sizeof(sha1_word_t), pms->sha1_h[i]);
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}
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}
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