/*
 * Copyright (c) 2025 The DragonFly Project.  All rights reserved.
 *
 * This code is derived from software contributed to The DragonFly Project
 * by Michael Neumann <mneumann@ntecs.de>.
 *
 * 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.
 * 3. Neither the name of The DragonFly Project nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific, prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
 * COPYRIGHT HOLDERS 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 _CRYPTOAPI_H_
#define _CRYPTOAPI_H_

#include <sys/types.h>

#define CRYPTOAPI_MAX_IV_LEN 16

typedef uint8_t cryptoapi_cipher_iv[CRYPTOAPI_MAX_IV_LEN];

typedef int cryptoapi_cipher_mode;

#define CRYPTOAPI_CIPHER_ENCRYPT 0
#define CRYPTOAPI_CIPHER_DECRYPT 1

struct cryptoapi_cipher_spec;

typedef const struct cryptoapi_cipher_spec *cryptoapi_cipher_t;

/*
 * Opaque cryptoapi session type.
 */
struct cryptoapi_cipher_session;

typedef struct cryptoapi_cipher_session *cryptoapi_cipher_session_t;

/**
 * Selects a cipher based on the specified ciphername, e.g. "aes-cbc",
 * the given keysize (in bits), and some platform or system settings,
 * e.g. whether AESNI is supported by the CPU or enabled by the sysadmin.
 */
cryptoapi_cipher_t cryptoapi_cipher_find(const char *ciphername,
    int keysize_in_bits);

const char *cryptoapi_cipher_get_description(cryptoapi_cipher_t cipher);

cryptoapi_cipher_session_t cryptoapi_cipher_newsession(
    cryptoapi_cipher_t cipher);

void cryptoapi_cipher_freesession(cryptoapi_cipher_session_t session);

int cryptoapi_cipher_setkey(cryptoapi_cipher_session_t session,
    const uint8_t *keydata, int keylen_in_bytes);

int cryptoapi_cipher_encrypt(const cryptoapi_cipher_session_t session,
    uint8_t *data, int datalen, const uint8_t *iv, int ivlen);

int cryptoapi_cipher_decrypt(const cryptoapi_cipher_session_t session,
    uint8_t *data, int datalen, const uint8_t *iv, int ivlen);

int cryptoapi_cipher_crypt(const cryptoapi_cipher_session_t session,
    uint8_t *data, int datalen, const uint8_t *iv, int ivlen,
    cryptoapi_cipher_mode mode);

#endif