/*      $NetBSD: adiantum.h,v 1.1 2020/06/29 23:44:01 riastradh Exp $   */

/*-
 * Copyright (c) 2020 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _CRYPTO_ADIANTUM_ADIANTUM_H
#define _CRYPTO_ADIANTUM_ADIANTUM_H

#include <sys/types.h>

#ifdef _KERNEL
#include <crypto/aes/aes.h>
#endif

struct adiantum {
        uint8_t         ks[32];         /* XChaCha12 key */

        /* BEGIN XCHACHA12 OUTPUT -- DO NOT REORDER */
        uint8_t         kk[32];         /* AES key */
        uint8_t         kt[16];         /* Poly1305 tweak key */
        uint8_t         kl[16];         /* Poly1305 message key */
        uint32_t        kn[268];        /* NH key */
        /* END XCHACHA12 OUTPUT */

        struct aesenc   kk_enc;         /* expanded AES key */
        struct aesdec   kk_dec;
};

#define ADIANTUM_KEYBYTES       32
#define ADIANTUM_BLOCKBYTES     16 /* size must be positive multiple of this */

void adiantum_init(struct adiantum *, const uint8_t[static ADIANTUM_KEYBYTES]);
void adiantum_enc(void *, const void *, size_t, const void *, size_t,
    const struct adiantum *);
void adiantum_dec(void *, const void *, size_t, const void *, size_t,
    const struct adiantum *);

int adiantum_selftest(void);

#endif  /* _CRYPTO_ADIANTUM_ADIANTUM_H */