/*	$OpenBSD: kdf.h,v 1.8 2022/07/12 14:42:49 kn Exp $ */
/*
 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
 * project.
 */
/* ====================================================================
 * Copyright (c) 2016-2018 The OpenSSL Project.  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.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED 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 OpenSSL PROJECT OR
 * ITS 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 HEADER_KDF_H
# define HEADER_KDF_H

#ifdef __cplusplus
extern "C" {
#endif

# define EVP_PKEY_CTRL_HKDF_MD                  (EVP_PKEY_ALG_CTRL + 3)
# define EVP_PKEY_CTRL_HKDF_SALT                (EVP_PKEY_ALG_CTRL + 4)
# define EVP_PKEY_CTRL_HKDF_KEY                 (EVP_PKEY_ALG_CTRL + 5)
# define EVP_PKEY_CTRL_HKDF_INFO                (EVP_PKEY_ALG_CTRL + 6)
# define EVP_PKEY_CTRL_HKDF_MODE                (EVP_PKEY_ALG_CTRL + 7)

# define EVP_PKEY_HKDEF_MODE_EXTRACT_AND_EXPAND 0
# define EVP_PKEY_HKDEF_MODE_EXTRACT_ONLY       1
# define EVP_PKEY_HKDEF_MODE_EXPAND_ONLY        2

# define EVP_PKEY_CTX_set_hkdf_md(pctx, md) \
            EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_DERIVE, \
                              EVP_PKEY_CTRL_HKDF_MD, 0, (void *)(md))

# define EVP_PKEY_CTX_set1_hkdf_salt(pctx, salt, saltlen) \
            EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_DERIVE, \
                              EVP_PKEY_CTRL_HKDF_SALT, saltlen, (void *)(salt))

# define EVP_PKEY_CTX_set1_hkdf_key(pctx, key, keylen) \
            EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_DERIVE, \
                              EVP_PKEY_CTRL_HKDF_KEY, keylen, (void *)(key))

# define EVP_PKEY_CTX_add1_hkdf_info(pctx, info, infolen) \
            EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_DERIVE, \
                              EVP_PKEY_CTRL_HKDF_INFO, infolen, (void *)(info))

# define EVP_PKEY_CTX_hkdf_mode(pctx, mode) \
            EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_DERIVE, \
                              EVP_PKEY_CTRL_HKDF_MODE, mode, NULL)

int ERR_load_KDF_strings(void);

/*
 * KDF function codes.
 */
# define KDF_F_PKEY_HKDF_CTRL_STR                         103
# define KDF_F_PKEY_HKDF_DERIVE                           102
# define KDF_F_PKEY_HKDF_INIT                             108

/*
 * KDF reason codes.
 */
# define KDF_R_MISSING_KEY                                104
# define KDF_R_MISSING_MESSAGE_DIGEST                     105
# define KDF_R_UNKNOWN_PARAMETER_TYPE                     103

# ifdef  __cplusplus
}
# endif
#endif
