1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
|
/* apk_csum.c - Alpine Package Keeper (APK)
*
* Copyright (C) 2009 Timo Teräs <timo.teras@iki.fi>
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation. See http://www.gnu.org/ for details.
*/
#ifndef APK_CSUM_H
#define APK_CSUM_H
#include <openssl/evp.h>
#define MAX_CSUM_SIZE 16 /* MD5 */
typedef unsigned char *csum_p;
typedef unsigned char csum_t[MAX_CSUM_SIZE];
typedef EVP_MD_CTX csum_ctx_t;
extern csum_t bad_checksum;
static inline void csum_init(csum_ctx_t *ctx)
{
EVP_DigestInit(ctx, EVP_md5());
}
static inline void csum_process(csum_ctx_t *ctx, unsigned char *buf, size_t len)
{
EVP_DigestUpdate(ctx, buf, len);
}
static inline void csum_finish(csum_ctx_t *ctx, csum_p csum)
{
EVP_DigestFinal(ctx, csum, NULL);
}
static inline int csum_valid(csum_p csum)
{
return memcmp(csum, bad_checksum, MAX_CSUM_SIZE);
}
static inline void csum_blob(apk_blob_t blob, csum_p csum)
{
csum_ctx_t ctx;
csum_init(&ctx);
csum_process(&ctx, (csum_p) blob.ptr, blob.len);
csum_finish(&ctx, csum);
}
#endif
|
