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/*
* SHA-1 implementation.
*
* Copyright (C) 2005 Paul Mackerras <paulus@samba.org>
*
* This version assumes we are running on a big-endian machine.
* It calls an external sha1_core() to process blocks of 64 bytes.
*/
#include <stdio.h>
#include <string.h>
#include "sha1.h"

extern void sha1_core(uint32_t *hash, const unsigned char *p,
unsigned int nblocks);

int SHA1_Init(SHA_CTX *c)
{
c->hash[0] = 0x67452301;
c->hash[1] = 0xEFCDAB89;
c->hash[2] = 0x98BADCFE;
c->hash[3] = 0x10325476;
c->hash[4] = 0xC3D2E1F0;
c->len = 0;
c->cnt = 0;
return 0;
}

int SHA1_Update(SHA_CTX *c, const void *ptr, unsigned long n)
{
unsigned long nb;
const unsigned char *p = ptr;

c->len += (uint64_t) n << 3;
while (n != 0) {
if (c->cnt || n < 64) {
nb = 64 - c->cnt;
if (nb > n)
nb = n;
memcpy(&c->buf.b[c->cnt], p, nb);
if ((c->cnt += nb) == 64) {
sha1_core(c->hash, c->buf.b, 1);
c->cnt = 0;
}
} else {
nb = n >> 6;
sha1_core(c->hash, p, nb);
nb <<= 6;
}
n -= nb;
p += nb;
}
return 0;
}

int SHA1_Final(unsigned char *hash, SHA_CTX *c)
{
unsigned int cnt = c->cnt;

c->buf.b[cnt++] = 0x80;
if (cnt > 56) {
if (cnt < 64)
memset(&c->buf.b[cnt], 0, 64 - cnt);
sha1_core(c->hash, c->buf.b, 1);
cnt = 0;
}
if (cnt < 56)
memset(&c->buf.b[cnt], 0, 56 - cnt);
c->buf.l[7] = c->len;
sha1_core(c->hash, c->buf.b, 1);
memcpy(hash, c->hash, 20);
return 0;
}
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