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/*
Copyright (C) Andrew Tridgell 2002
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
simple front-end functions to mdfour code
*/
#include "ccache.h"
static struct mdfour md;
void hash_buffer(const char *s, int len)
{
static char tail[64];
static int tail_len;
/* s == NULL means push the last chunk */
if (s == NULL) {
if (tail_len > 0) {
mdfour_update(&md, (unsigned char *)tail, tail_len);
tail_len = 0;
}
return;
}
if (tail_len) {
int n = 64-tail_len;
if (n > len) n = len;
memcpy(tail+tail_len, s, n);
tail_len += n;
len -= n;
s += n;
if (tail_len == 64) {
mdfour_update(&md, (unsigned char *)tail, 64);
tail_len = 0;
}
}
while (len >= 64) {
mdfour_update(&md, (unsigned char *)s, 64);
s += 64;
len -= 64;
}
if (len) {
memcpy(tail, s, len);
tail_len = len;
}
}
void hash_start(void)
{
mdfour_begin(&md);
}
void hash_string(const char *s)
{
hash_buffer(s, strlen(s));
}
void hash_int(int x)
{
hash_buffer((char *)&x, sizeof(x));
}
/* add contents of a file to the hash */
void hash_file(const char *fname)
{
char buf[1024];
int fd, n;
fd = open(fname, O_RDONLY);
if (fd == -1) {
cc_log("Failed to open %s\n", fname);
fatal("hash_file");
}
while ((n = read(fd, buf, sizeof(buf))) > 0) {
hash_buffer(buf, n);
}
close(fd);
}
/* return the hash result as a static string */
char *hash_result(void)
{
unsigned char sum[16];
static char ret[53];
int i;
hash_buffer(NULL, 0);
mdfour_result(&md, sum);
for (i=0;i<16;i++) {
sprintf(&ret[i*2], "%02x", (unsigned)sum[i]);
}
sprintf(&ret[i*2], "-%u", (unsigned)md.totalN);
return ret;
}
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