128 lines
2.2 KiB
C
128 lines
2.2 KiB
C
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#include "os.h"
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#include <libsec.h>
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static void encode(uchar*, u32int*, ulong);
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extern void _sha1block(uchar*, ulong, u32int*);
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/*
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* we require len to be a multiple of 64 for all but
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* the last call. There must be room in the input buffer
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* to pad.
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*/
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SHA1state*
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sha1(uchar *p, ulong len, uchar *digest, SHA1state *s)
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{
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uchar buf[128];
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u32int x[16];
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int i;
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uchar *e;
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if(s == nil){
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s = malloc(sizeof(*s));
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if(s == nil)
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return nil;
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memset(s, 0, sizeof(*s));
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s->malloced = 1;
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}
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if(s->seeded == 0){
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/* seed the state, these constants would look nicer big-endian */
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s->state[0] = 0x67452301;
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s->state[1] = 0xefcdab89;
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s->state[2] = 0x98badcfe;
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s->state[3] = 0x10325476;
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s->state[4] = 0xc3d2e1f0;
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s->seeded = 1;
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}
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/* fill out the partial 64 byte block from previous calls */
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if(s->blen){
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i = 64 - s->blen;
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if(len < i)
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i = len;
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memmove(s->buf + s->blen, p, i);
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len -= i;
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s->blen += i;
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p += i;
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if(s->blen == 64){
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_sha1block(s->buf, s->blen, s->state);
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s->len += s->blen;
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s->blen = 0;
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}
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}
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/* do 64 byte blocks */
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i = len & ~0x3f;
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if(i){
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_sha1block(p, i, s->state);
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s->len += i;
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len -= i;
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p += i;
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}
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/* save the left overs if not last call */
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if(digest == 0){
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if(len){
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memmove(s->buf, p, len);
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s->blen += len;
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}
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return s;
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}
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/*
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* this is the last time through, pad what's left with 0x80,
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* 0's, and the input count to create a multiple of 64 bytes
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*/
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if(s->blen){
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p = s->buf;
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len = s->blen;
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} else {
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memmove(buf, p, len);
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p = buf;
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}
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s->len += len;
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e = p + len;
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if(len < 56)
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i = 56 - len;
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else
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i = 120 - len;
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memset(e, 0, i);
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*e = 0x80;
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len += i;
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/* append the count */
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x[0] = s->len>>29;
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x[1] = s->len<<3;
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encode(p+len, x, 8);
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/* digest the last part */
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_sha1block(p, len+8, s->state);
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s->len += len+8;
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/* return result and free state */
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encode(digest, s->state, SHA1dlen);
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if(s->malloced == 1)
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free(s);
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return nil;
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}
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/*
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* encodes input (ulong) into output (uchar). Assumes len is
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* a multiple of 4.
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*/
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static void
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encode(uchar *output, u32int *input, ulong len)
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{
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u32int x;
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uchar *e;
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for(e = output + len; output < e;) {
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x = *input++;
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*output++ = x >> 24;
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*output++ = x >> 16;
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*output++ = x >> 8;
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*output++ = x;
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}
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}
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