/*
Copyright (c) 2014 Google Inc.
Copyright (c) 2014, 2015 MariaDB Corporation
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; version 2 of the License.
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, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
#ifndef MY_CRYPT_INCLUDED
#define MY_CRYPT_INCLUDED
#include <my_global.h>
#ifdef __cplusplus
extern "C" {
#endif
/* return values from my_aes_encrypt/my_aes_decrypt functions */
#define MY_AES_OK 0
#define MY_AES_BAD_DATA -100
#define MY_AES_OPENSSL_ERROR -101
#define MY_AES_BAD_KEYSIZE -102
/* The block size for all supported algorithms */
#define MY_AES_BLOCK_SIZE 16
/* The max key length of all supported algorithms */
#define MY_AES_MAX_KEY_LENGTH 32
#define MY_AES_CTX_SIZE 512
enum my_aes_mode {
MY_AES_ECB, MY_AES_CBC
#ifdef HAVE_EncryptAes128Ctr
, MY_AES_CTR
#endif
#ifdef HAVE_EncryptAes128Gcm
, MY_AES_GCM
#endif
};
int my_aes_crypt_init(void *ctx, enum my_aes_mode mode, int flags,
const unsigned char* key, unsigned int klen,
const unsigned char* iv, unsigned int ivlen);
int my_aes_crypt_update(void *ctx, const uchar *src, uint slen,
uchar *dst, uint *dlen);
int my_aes_crypt_finish(void *ctx, uchar *dst, uint *dlen);
int my_aes_crypt(enum my_aes_mode mode, int flags,
const uchar *src, uint slen, uchar *dst, uint *dlen,
const uchar *key, uint klen, const uchar *iv, uint ivlen);
/*
calculate the length of the cyphertext from the length of the plaintext
for different AES encryption modes with padding enabled.
Without padding (ENCRYPTION_FLAG_NOPAD) cyphertext has the same length
as the plaintext
*/
static inline uint my_aes_get_size(enum my_aes_mode mode __attribute__((unused)), uint source_length)
{
#ifdef HAVE_EncryptAes128Ctr
if (mode == MY_AES_CTR)
return source_length;
#ifdef HAVE_EncryptAes128Gcm
if (mode == MY_AES_GCM)
return source_length + MY_AES_BLOCK_SIZE;
#endif
#endif
return (source_length / MY_AES_BLOCK_SIZE + 1) * MY_AES_BLOCK_SIZE;
}
static inline uint my_aes_ctx_size(enum my_aes_mode mode __attribute__((unused)))
{
return MY_AES_CTX_SIZE;
}
int my_random_bytes(uchar* buf, int num);
#ifdef __cplusplus
}
#endif
#endif /* MY_CRYPT_INCLUDED */
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