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#include <stdio.h>
#include <string.h>
#include <stddef.h>
#include <sys/types.h>
#include <freeswan.h>
#include "constants.h"
#include "defs.h"
#include "log.h"
#include "libaes/aes_cbc.h"
#include "alg_info.h"
#include "ike_alg.h"
#define AES_CBC_BLOCK_SIZE (128/BITS_PER_BYTE)
#define AES_KEY_MIN_LEN 128
#define AES_KEY_DEF_LEN 128
#define AES_KEY_MAX_LEN 256
static void
do_aes(u_int8_t *buf, size_t buf_len, u_int8_t *key, size_t key_size, u_int8_t *iv, bool enc)
{
aes_context aes_ctx;
char iv_bak[AES_CBC_BLOCK_SIZE];
char *new_iv = NULL; /* logic will avoid copy to NULL */
aes_set_key(&aes_ctx, key, key_size, 0);
/*
* my AES cbc does not touch passed IV (optimization for
* ESP handling), so I must "emulate" des-like IV
* crunching
*/
if (!enc)
memcpy(new_iv=iv_bak, (char*) buf + buf_len - AES_CBC_BLOCK_SIZE
, AES_CBC_BLOCK_SIZE);
AES_cbc_encrypt(&aes_ctx, buf, buf, buf_len, iv, enc);
if (enc)
new_iv = (char*) buf + buf_len-AES_CBC_BLOCK_SIZE;
memcpy(iv, new_iv, AES_CBC_BLOCK_SIZE);
}
struct encrypt_desc algo_aes =
{
algo_type: IKE_ALG_ENCRYPT,
algo_id: OAKLEY_AES_CBC,
algo_next: NULL,
enc_ctxsize: sizeof(aes_context),
enc_blocksize: AES_CBC_BLOCK_SIZE,
keyminlen: AES_KEY_MIN_LEN,
keydeflen: AES_KEY_DEF_LEN,
keymaxlen: AES_KEY_MAX_LEN,
do_crypt: do_aes,
};
int ike_alg_aes_init(void);
int
ike_alg_aes_init(void)
{
int ret = ike_alg_register_enc(&algo_aes);
return ret;
}
/*
IKE_ALG_INIT_NAME: ike_alg_aes_init
*/
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