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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 <gcrypt.h>
/* Just some simple interfaces on top of libgcrypt */
static char *
_hex_of_sha1_digest (gcry_md_hd_t c)
{
char *result, *r;
unsigned char *digest;
int i;
int digest_size;
digest_size = gcry_md_get_algo_dlen(gcry_md_get_algo(c));
digest = gcry_md_read(c, 0);
result = xcalloc (digest_size * 2 + 1, 1);
for (r = result, i = 0;
i < 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)
{
char *result;
gcry_md_hd_t c;
gcry_md_open (&c, GCRY_MD_SHA1, 0);
gcry_md_write (c, str, strlen (str) + 1);
gcry_md_final (c);
result = _hex_of_sha1_digest (c);
gcry_md_close (c);
return result;
}
/* 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;
gcry_md_hd_t c;
char *result;
file = fopen (filename, "r");
if (file == NULL)
return NULL;
gcry_md_open(&c, GCRY_MD_SHA1, 0);
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 {
gcry_md_write (c, block, bytes_read);
}
}
gcry_md_final (c);
result = _hex_of_sha1_digest (c);
gcry_md_close (c);
fclose (file);
return result;
}
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