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/* $OpenBSD: gmac.h,v 1.2 2012/12/05 23:20:15 deraadt Exp $ */
/*
* Copyright (c) 2010 Mike Belopuhov <mike@vantronix.net>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef _GMAC_H_
#define _GMAC_H_
#include <crypto/rijndael/rijndael.h>
#define GMAC_BLOCK_LEN 16
#define GMAC_DIGEST_LEN 16
typedef struct _GHASH_CTX {
uint8_t H[GMAC_BLOCK_LEN]; /* hash subkey */
uint8_t S[GMAC_BLOCK_LEN]; /* state */
uint8_t Z[GMAC_BLOCK_LEN]; /* initial state */
} GHASH_CTX;
typedef struct _AES_GMAC_CTX {
GHASH_CTX ghash;
uint32_t K[4*(RIJNDAEL_MAXNR + 1)];
uint8_t J[GMAC_BLOCK_LEN]; /* counter block */
int rounds;
} AES_GMAC_CTX;
__BEGIN_DECLS
void AES_GMAC_Init(AES_GMAC_CTX *);
void AES_GMAC_Setkey(AES_GMAC_CTX *, const uint8_t *, uint16_t);
void AES_GMAC_Reinit(AES_GMAC_CTX *, const uint8_t *, uint16_t);
int AES_GMAC_Update(AES_GMAC_CTX *, const uint8_t *, uint16_t);
void AES_GMAC_Final(uint8_t [GMAC_DIGEST_LEN], AES_GMAC_CTX *);
__END_DECLS
#endif /* _GMAC_H_ */
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