diff options
Diffstat (limited to 'src/apk_csum.h')
| -rw-r--r-- | src/apk_csum.h | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/src/apk_csum.h b/src/apk_csum.h new file mode 100644 index 0000000..564339b --- /dev/null +++ b/src/apk_csum.h @@ -0,0 +1,53 @@ +/* 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 |