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/* sha1.c - Interfaces to SHA-1 hash for the notmuch mail system
*
* Copyright © 2009 Carl Worth
*
* 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, see http://www.gnu.org/licenses/ .
*
* Author: Carl Worth <cworth@cworth.org>
*/
#include "notmuch-private.h"
#include "libsha1.h"
/* Just some simple interfaces on top of libsha1 so that we can leave
* libsha1 as untouched as possible. */
static char *
_hex_of_sha1_digest (const unsigned char digest[SHA1_DIGEST_SIZE])
{
char *result, *r;
int i;
result = xcalloc (SHA1_DIGEST_SIZE * 2 + 1, 1);
for (r = result, i = 0;
i < SHA1_DIGEST_SIZE;
r += 2, i++)
{
sprintf (r, "%02x", digest[i]);
}
return result;
}
/* Create a hexadecimal string version of the SHA-1 digest of 'str'
* (including its null terminating character).
*
* This function returns a newly allocated string which the caller
* should free() when finished.
*/
char *
notmuch_sha1_of_string (const char *str)
{
sha1_ctx sha1;
unsigned char digest[SHA1_DIGEST_SIZE];
sha1_begin (&sha1);
sha1_hash ((unsigned char *) str, strlen (str) + 1, &sha1);
sha1_end (digest, &sha1);
return _hex_of_sha1_digest (digest);
}
/* Create a hexadecimal string version of the SHA-1 digest of the
* contents of the named file.
*
* This function returns a newly allocated string which the caller
* should free() when finished.
*
* If any error occurs while reading the file, (permission denied,
* file not found, etc.), this function returns NULL.
*/
char *
notmuch_sha1_of_file (const char *filename)
{
FILE *file;
#define BLOCK_SIZE 4096
unsigned char block[BLOCK_SIZE];
size_t bytes_read;
sha1_ctx sha1;
unsigned char digest[SHA1_DIGEST_SIZE];
char *result;
file = fopen (filename, "r");
if (file == NULL)
return NULL;
sha1_begin (&sha1);
while (1) {
bytes_read = fread (block, 1, 4096, file);
if (bytes_read == 0) {
if (feof (file)) {
break;
} else if (ferror (file)) {
fclose (file);
return NULL;
}
} else {
sha1_hash (block, bytes_read, &sha1);
}
}
sha1_end (digest, &sha1);
result = _hex_of_sha1_digest (digest);
fclose (file);
return result;
}
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