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/* eax.h
*
* EAX mode, see http://www.cs.ucdavis.edu/~rogaway/papers/eax.pdf
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2013 Niels Möller
*
* 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.
*
* The nettle library 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the nettle library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02111-1301, USA.
*/
#ifndef NETTLE_EAX_H_INCLUDED
#define NETTLE_EAX_H_INCLUDED
#include "aes.h"
#ifdef __cplusplus
extern "C" {
#endif
/* Name mangling */
#define eax_set_key nettle_eax_set_key
#define eax_set_nonce nettle_eax_set_nonce
#define eax_update nettle_eax_update
#define eax_encrypt nettle_eax_encrypt
#define eax_decrypt nettle_eax_decrypt
#define eax_digest nettle_eax_digest
#define eax_aes_set_key nettle_eax_aes_set_key
#define eax_aes_set_nonce nettle_eax_aes_set_nonce
#define eax_aes_update nettle_eax_aes_update
#define eax_aes_encrypt nettle_eax_aes_encrypt
#define eax_aes_decrypt nettle_eax_aes_decrypt
#define eax_aes_digest nettle_eax_aes_digest
/* Restricted to block ciphers with 128 bit block size. FIXME: Reflect
this in naming? */
#define EAX_BLOCK_SIZE 16
/* FIXME: Ensure nice alignment. See gcm.h, union gcm_block. */
/* Values independent of message and nonce */
struct eax_key
{
union nettle_block16 pad_block;
union nettle_block16 pad_partial;
};
struct eax_ctx
{
union nettle_block16 omac_nonce;
union nettle_block16 omac_data;
union nettle_block16 omac_message;
union nettle_block16 ctr;
};
void
eax_set_key (struct eax_key *key, void *cipher, nettle_crypt_func *f);
void
eax_set_nonce (struct eax_ctx *eax, const struct eax_key *key,
void *cipher, nettle_crypt_func *f,
size_t nonce_length, const uint8_t *nonce);
void
eax_update (struct eax_ctx *eax, const struct eax_key *key,
void *cipher, nettle_crypt_func *f,
size_t data_length, const uint8_t *data);
void
eax_encrypt (struct eax_ctx *eax, const struct eax_key *key,
void *cipher, nettle_crypt_func *f,
size_t length, uint8_t *dst, const uint8_t *src);
void
eax_decrypt (struct eax_ctx *eax, const struct eax_key *key,
void *cipher, nettle_crypt_func *f,
size_t length, uint8_t *dst, const uint8_t *src);
void
eax_digest (struct eax_ctx *eax, const struct eax_key *key,
void *cipher, nettle_crypt_func *f,
size_t length, uint8_t *digest);
/* Put the cipher last, to get cipher-independent offsets for the EAX
* state. */
#define EAX_CTX(type) \
{ struct eax_key key; struct eax_ctx eax; type cipher; }
#define EAX_SET_KEY(ctx, set_key, encrypt, length, data) \
do { \
(set_key)(&(ctx)->cipher, (length), (data)); \
if (0) (encrypt) (&(ctx)->cipher, 0, (void *) 0, (void *) 0); \
eax_set_key (&(ctx)->key, &(ctx)->cipher, (nettle_crypt_func *) encrypt); \
} while (0)
#define EAX_SET_NONCE(ctx, encrypt, length, nonce) \
(0 ? (encrypt) (&(ctx)->cipher, 0, (void *) 0, (void *) 0) \
: eax_set_nonce (&(ctx)->eax, &(ctx)->key, \
&(ctx)->cipher, (nettle_crypt_func *) (encrypt), \
(length), (nonce)))
#define EAX_UPDATE(ctx, encrypt, length, data) \
(0 ? (encrypt) (&(ctx)->cipher, 0, (void *) 0, (void *) 0) \
: eax_update (&(ctx)->eax, &(ctx)->key, \
&(ctx)->cipher, (nettle_crypt_func *) (encrypt), \
(length), (data)))
#define EAX_ENCRYPT(ctx, encrypt, length, dst, src) \
(0 ? (encrypt) (&(ctx)->cipher, 0, (void *) 0, (void *) 0) \
: eax_encrypt (&(ctx)->eax, &(ctx)->key, \
&(ctx)->cipher, (nettle_crypt_func *) (encrypt), \
(length), (dst), (src)))
#define EAX_DECRYPT(ctx, encrypt, length, dst, src) \
(0 ? (encrypt) (&(ctx)->cipher, 0, (void *) 0, (void *) 0) \
: eax_decrypt (&(ctx)->eax, &(ctx)->key, \
&(ctx)->cipher, (nettle_crypt_func *) (encrypt), \
(length), (dst), (src)))
#define EAX_DIGEST(ctx, encrypt, length, digest) \
(0 ? (encrypt) (&(ctx)->cipher, 0, (void *) 0, (void *) 0) \
: eax_digest (&(ctx)->eax, &(ctx)->key, \
&(ctx)->cipher, (nettle_crypt_func *) (encrypt), \
(length), (digest)))
#ifdef __cplusplus
}
#endif
#endif /* NETTLE_EAX_H_INCLUDED */
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