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// Copyright (C) 2002 Andrew Tridgell
// Copyright (C) 2010-2018 Joel Rosdahl
//
// 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 3 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., 51
// Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
#include "ccache.h"
#include "hash.h"
#include "mdfour.h"
#define HASH_DELIMITER "\000cCaChE"
struct hash {
struct mdfour md;
FILE *debug_binary;
FILE *debug_text;
};
static void
do_hash_buffer(struct hash *hash, const void *s, size_t len)
{
mdfour_update(&hash->md, (const unsigned char *)s, len);
if (len > 0 && hash->debug_binary) {
(void) fwrite(s, 1, len, hash->debug_binary);
}
}
static void
do_debug_text(struct hash *hash, const void *s, size_t len)
{
if (len > 0 && hash->debug_text) {
(void) fwrite(s, 1, len, hash->debug_text);
}
}
struct hash *
hash_init(void)
{
struct hash *hash = malloc(sizeof(struct hash));
mdfour_begin(&hash->md);
hash->debug_binary = NULL;
hash->debug_text = NULL;
return hash;
}
struct hash *
hash_copy(struct hash *hash)
{
struct hash *result = malloc(sizeof(struct hash));
result->md = hash->md;
result->debug_binary = NULL;
result->debug_text = NULL;
return result;
}
void hash_free(struct hash *hash)
{
free(hash);
}
void hash_enable_debug(
struct hash *hash, const char *section_name,
FILE *debug_binary, FILE *debug_text)
{
hash->debug_binary = debug_binary;
hash->debug_text = debug_text;
do_debug_text(hash, "=== ", 4);
do_debug_text(hash, section_name, strlen(section_name));
do_debug_text(hash, " ===\n", 5);
}
size_t
hash_input_size(struct hash *hash)
{
return hash->md.totalN;
}
void
hash_buffer(struct hash *hash, const void *s, size_t len)
{
do_hash_buffer(hash, s, len);
do_debug_text(hash, s, len);
}
char *
hash_result(struct hash *hash)
{
unsigned char sum[16];
hash_result_as_bytes(hash, sum);
return format_hash_as_string(sum, (unsigned) hash->md.totalN);
}
void
hash_result_as_bytes(struct hash *hash, unsigned char *out)
{
mdfour_update(&hash->md, NULL, 0);
mdfour_result(&hash->md, out);
}
bool
hash_equal(struct hash *hash1, struct hash *hash2)
{
unsigned char sum1[16];
hash_result_as_bytes(hash1, sum1);
unsigned char sum2[16];
hash_result_as_bytes(hash2, sum2);
return memcmp(sum1, sum2, sizeof(sum1)) == 0;
}
void
hash_delimiter(struct hash *hash, const char *type)
{
do_hash_buffer(hash, HASH_DELIMITER, sizeof(HASH_DELIMITER));
do_hash_buffer(hash, type, strlen(type) + 1); // Include NUL.
do_debug_text(hash, "### ", 4);
do_debug_text(hash, type, strlen(type));
do_debug_text(hash, "\n", 1);
}
void
hash_string(struct hash *hash, const char *s)
{
hash_string_buffer(hash, s, strlen(s));
}
void
hash_string_buffer(struct hash *hash, const char *s, int length)
{
hash_buffer(hash, s, length);
do_debug_text(hash, "\n", 1);
}
void
hash_int(struct hash *hash, int x)
{
do_hash_buffer(hash, (char *)&x, sizeof(x));
char buf[16];
snprintf(buf, sizeof(buf), "%d", x);
do_debug_text(hash, buf, strlen(buf));
do_debug_text(hash, "\n", 1);
}
bool
hash_fd(struct hash *hash, int fd)
{
char buf[READ_BUFFER_SIZE];
ssize_t n;
while ((n = read(fd, buf, sizeof(buf))) != 0) {
if (n == -1 && errno != EINTR) {
break;
}
if (n > 0) {
do_hash_buffer(hash, buf, n);
do_debug_text(hash, buf, n);
}
}
return n == 0;
}
bool
hash_file(struct hash *hash, const char *fname)
{
int fd = open(fname, O_RDONLY|O_BINARY);
if (fd == -1) {
cc_log("Failed to open %s: %s", fname, strerror(errno));
return false;
}
bool ret = hash_fd(hash, fd);
close(fd);
return ret;
}
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