/* $NetBSD: gmac.h,v 1.4 2026/07/05 15:33:44 riastradh Exp $ */
/* OpenBSD: gmac.h,v 1.1 2010/09/22 11:54:23 mikeb 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 <sys/types.h>

#include <crypto/aes/aes.h>

#define GMAC_BLOCK_LEN          16
#define GMAC_DIGEST_LEN         16

#ifdef _LP64
#define GMAC_INT uint64_t
#define GMAC_INTLEN 8
#else
#define GMAC_INT uint32_t
#define GMAC_INTLEN 4
#endif

typedef struct _GHASH_CTX {
        GMAC_INT        H[GMAC_BLOCK_LEN/GMAC_INTLEN];  /* hash subkey */
        GMAC_INT        S[GMAC_BLOCK_LEN/GMAC_INTLEN];  /* state */
        GMAC_INT        Z[GMAC_BLOCK_LEN/GMAC_INTLEN];  /* initial state */
} GHASH_CTX;

typedef struct _AES_GMAC_CTX {
        GHASH_CTX       ghash;
        struct aesenc   K;
        uint8_t         J[GMAC_BLOCK_LEN];              /* counter block */
        int             rounds;
} AES_GMAC_CTX;

#include <sys/cdefs.h>

__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_ */