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/*
* Highly portable ANSI C implementation of Rijndael cipher.
* Written by Kaz Kylheku.
*/
#ifndef RIJNDAEL_H
#define RIJNDAEL_H
#include <stddef.h>
#ifdef __cplusplus
extern "C" {
#endif
#define RIJN_MAX_ROUNDS 14
/*
* Constants representing choice of Rijndael key or block size,
* either of which can be 128 bits, 192 bits or 256 bits.
*/
typedef enum {
rijn_128 = 4, /* number of rows */
rijn_192 = 6,
rijn_256 = 8
} rijn_size_t;
/*
* Rijndael parameters.
*/
typedef struct {
rijn_size_t rijn_blockrows;
rijn_size_t rijn_keyrows;
} rijn_param_t;
#define RIJN_PARAM_DEFAULT_INITIALIZER { rijn_128, rijn_256 }
#define RIJN_PARAM_INITIALIZER(BLOCKSZ, KEYSZ) { (BLOCKSZ), (KEYSZ) }
void rijn_param_init(rijn_param_t *, rijn_size_t blocksz, rijn_size_t keysz);
/*
* Rijndael keys are 128, 192 or 256 bits wide. There are up to
* RIJN_MAX_ROUNDS + 1 round keys needed, so the schedule is that big.
*/
typedef unsigned char rijn_unit_t[4];
typedef rijn_unit_t rijn_key_t[8];
typedef rijn_unit_t rijn_block_t[8];
typedef unsigned char rijn_flatblock_t[sizeof (rijn_block_t)];
typedef struct {
rijn_param_t rijn_param;
int rijn_nrounds;
rijn_block_t rijn_roundkey[RIJN_MAX_ROUNDS];
} rijn_keysched_t;
void rijn_sched_key(rijn_keysched_t *, rijn_key_t *, const rijn_param_t *);
void rijn_encrypt(rijn_keysched_t *, unsigned char *, const unsigned char *);
void rijn_decrypt(rijn_keysched_t *, unsigned char *, const unsigned char *);
void rijn_cbc_encrypt(rijn_keysched_t *, unsigned char *iv, unsigned char *out,
const unsigned char *in, size_t nblocks);
void rijn_cbc_decrypt(rijn_keysched_t *, unsigned char *iv, unsigned char *out,
const unsigned char *in, size_t nblocks);
void rijn_cfb_encrypt(rijn_keysched_t *, unsigned char *iv, unsigned char *out,
const unsigned char *pt, size_t nbytes);
void rijn_cfb_decrypt(rijn_keysched_t *, unsigned char *iv, unsigned char *out,
const unsigned char *in, size_t nbytes);
#ifdef __cplusplus
}
#endif
#endif
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