/*      $OpenBSD: gmac.h,v 1.6 2017/05/02 11:44:32 mikeb Exp $  */

/*
 * Copyright (c) 2010 Mike Belopuhov
 *
 * 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/aes.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;
        AES_CTX         K;
        uint8_t         J[GMAC_BLOCK_LEN];              /* counter block */
} AES_GMAC_CTX;

__BEGIN_DECLS
extern void (*ghash_update)(GHASH_CTX *, uint8_t *, size_t);

void    AES_GMAC_Init(void *);
void    AES_GMAC_Setkey(void *, const uint8_t *, uint16_t);
void    AES_GMAC_Reinit(void *, const uint8_t *, uint16_t);
int     AES_GMAC_Update(void *, const uint8_t *, uint16_t);
void    AES_GMAC_Final(uint8_t [GMAC_DIGEST_LEN], void *);
__END_DECLS

#endif /* _GMAC_H_ */