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/* 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)
{
EVP_Digest(blob.ptr, blob.len, csum, NULL, EVP_md5(), NULL);
}
#endif
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