mirror of
https://git.notmuchmail.org/git/notmuch
synced 2024-11-24 20:08:10 +01:00
115 lines
2.7 KiB
C
115 lines
2.7 KiB
C
/* 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;
|
|
}
|
|
|