aes.h 2.33 KB
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/* aes.h
 *
 * The aes/rijndael block cipher.
 */

/* nettle, low-level cryptographics library
 *
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 * Copyright (C) 2001 Niels Möller
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 *  
 * The nettle library is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or (at your
 * option) any later version.
 * 
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 * The nettle library is distributed in the hope that it will be useful, but
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 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
 * License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
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 * along with the nettle library; see the file COPYING.LIB.  If not, write to
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 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02111-1301, USA.
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 */
 
#ifndef NETTLE_AES_H_INCLUDED
#define NETTLE_AES_H_INCLUDED

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#include "nettle-types.h"
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#ifdef __cplusplus
extern "C" {
#endif

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/* Name mangling */
#define aes_set_encrypt_key nettle_aes_set_encrypt_key
#define aes_set_decrypt_key nettle_aes_set_decrypt_key
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#define aes_invert_key nettle_aes_invert_key
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#define aes_encrypt nettle_aes_encrypt
#define aes_decrypt nettle_aes_decrypt

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#define AES_BLOCK_SIZE 16

/* Variable key size between 128 and 256 bits. But the only valid
 * values are 16 (128 bits), 24 (192 bits) and 32 (256 bits). */
#define AES_MIN_KEY_SIZE 16
#define AES_MAX_KEY_SIZE 32

#define AES_KEY_SIZE 32

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/* FIXME: Change to put nrounds first, to make it possible to use a
   truncated ctx struct, with less subkeys, for the shorter key
   sizes? */
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struct aes_ctx
{
  uint32_t keys[60];  /* maximum size of key schedule */
  unsigned  nrounds;  /* number of rounds to use for our key size */
};

void
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aes_set_encrypt_key(struct aes_ctx *ctx,
		    unsigned length, const uint8_t *key);
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void
aes_set_decrypt_key(struct aes_ctx *ctx,
		   unsigned length, const uint8_t *key);
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void
aes_invert_key(struct aes_ctx *dst,
	       const struct aes_ctx *src);

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void
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aes_encrypt(const struct aes_ctx *ctx,
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	    unsigned length, uint8_t *dst,
	    const uint8_t *src);
void
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aes_decrypt(const struct aes_ctx *ctx,
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	    unsigned length, uint8_t *dst,
	    const uint8_t *src);

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#ifdef __cplusplus
}
#endif

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#endif /* NETTLE_AES_H_INCLUDED */