mirror of git://git.suckless.org/sbase
139 lines
2.9 KiB
C
139 lines
2.9 KiB
C
/* public domain sha1 implementation based on rfc3174 and libtomcrypt */
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#include <stdint.h>
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#include <string.h>
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#include "../sha1.h"
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static uint32_t rol(uint32_t n, int k) { return (n << k) | (n >> (32-k)); }
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#define F0(b,c,d) (d ^ (b & (c ^ d)))
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#define F1(b,c,d) (b ^ c ^ d)
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#define F2(b,c,d) ((b & c) | (d & (b | c)))
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#define F3(b,c,d) (b ^ c ^ d)
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#define G0(a,b,c,d,e,i) e += rol(a,5)+F0(b,c,d)+W[i]+0x5A827999; b = rol(b,30)
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#define G1(a,b,c,d,e,i) e += rol(a,5)+F1(b,c,d)+W[i]+0x6ED9EBA1; b = rol(b,30)
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#define G2(a,b,c,d,e,i) e += rol(a,5)+F2(b,c,d)+W[i]+0x8F1BBCDC; b = rol(b,30)
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#define G3(a,b,c,d,e,i) e += rol(a,5)+F3(b,c,d)+W[i]+0xCA62C1D6; b = rol(b,30)
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static void processblock(struct sha1 *s, const uint8_t *buf)
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{
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uint32_t W[80], a, b, c, d, e;
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int i;
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for (i = 0; i < 16; i++) {
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W[i] = (uint32_t)buf[4*i]<<24;
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W[i] |= (uint32_t)buf[4*i+1]<<16;
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W[i] |= (uint32_t)buf[4*i+2]<<8;
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W[i] |= buf[4*i+3];
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}
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for (; i < 80; i++)
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W[i] = rol(W[i-3] ^ W[i-8] ^ W[i-14] ^ W[i-16], 1);
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a = s->h[0];
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b = s->h[1];
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c = s->h[2];
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d = s->h[3];
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e = s->h[4];
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for (i = 0; i < 20; ) {
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G0(a,b,c,d,e,i++);
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G0(e,a,b,c,d,i++);
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G0(d,e,a,b,c,i++);
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G0(c,d,e,a,b,i++);
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G0(b,c,d,e,a,i++);
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}
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while (i < 40) {
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G1(a,b,c,d,e,i++);
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G1(e,a,b,c,d,i++);
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G1(d,e,a,b,c,i++);
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G1(c,d,e,a,b,i++);
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G1(b,c,d,e,a,i++);
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}
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while (i < 60) {
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G2(a,b,c,d,e,i++);
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G2(e,a,b,c,d,i++);
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G2(d,e,a,b,c,i++);
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G2(c,d,e,a,b,i++);
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G2(b,c,d,e,a,i++);
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}
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while (i < 80) {
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G3(a,b,c,d,e,i++);
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G3(e,a,b,c,d,i++);
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G3(d,e,a,b,c,i++);
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G3(c,d,e,a,b,i++);
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G3(b,c,d,e,a,i++);
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}
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s->h[0] += a;
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s->h[1] += b;
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s->h[2] += c;
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s->h[3] += d;
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s->h[4] += e;
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}
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static void pad(struct sha1 *s)
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{
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unsigned r = s->len % 64;
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s->buf[r++] = 0x80;
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if (r > 56) {
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memset(s->buf + r, 0, 64 - r);
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r = 0;
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processblock(s, s->buf);
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}
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memset(s->buf + r, 0, 56 - r);
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s->len *= 8;
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s->buf[56] = s->len >> 56;
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s->buf[57] = s->len >> 48;
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s->buf[58] = s->len >> 40;
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s->buf[59] = s->len >> 32;
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s->buf[60] = s->len >> 24;
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s->buf[61] = s->len >> 16;
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s->buf[62] = s->len >> 8;
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s->buf[63] = s->len;
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processblock(s, s->buf);
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}
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void sha1_init(void *ctx)
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{
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struct sha1 *s = ctx;
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s->len = 0;
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s->h[0] = 0x67452301;
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s->h[1] = 0xEFCDAB89;
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s->h[2] = 0x98BADCFE;
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s->h[3] = 0x10325476;
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s->h[4] = 0xC3D2E1F0;
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}
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void sha1_sum(void *ctx, uint8_t md[SHA1_DIGEST_LENGTH])
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{
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struct sha1 *s = ctx;
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int i;
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pad(s);
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for (i = 0; i < 5; i++) {
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md[4*i] = s->h[i] >> 24;
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md[4*i+1] = s->h[i] >> 16;
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md[4*i+2] = s->h[i] >> 8;
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md[4*i+3] = s->h[i];
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}
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}
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void sha1_update(void *ctx, const void *m, unsigned long len)
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{
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struct sha1 *s = ctx;
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const uint8_t *p = m;
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unsigned r = s->len % 64;
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s->len += len;
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if (r) {
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if (len < 64 - r) {
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memcpy(s->buf + r, p, len);
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return;
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}
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memcpy(s->buf + r, p, 64 - r);
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len -= 64 - r;
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p += 64 - r;
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processblock(s, s->buf);
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}
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for (; len >= 64; len -= 64, p += 64)
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processblock(s, p);
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memcpy(s->buf, p, len);
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}
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