/*
 * Copyright (c) 2021, [Ribose Inc](https://www.ribose.com).
 * 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 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 OWNER 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 ECDH_UTILS_H_
#define ECDH_UTILS_H_

#include "ecdh.h"

// Keys up to 312 bits (+1 bytes of PKCS5 padding)
#define MAX_SESSION_KEY_SIZE 40
#define MAX_AES_KEY_SIZE 32

namespace pgp {
namespace ecdh {
std::vector<uint8_t> kdf_other_info_serialize(const ec::Curve &           curve,
                                              const std::vector<uint8_t> &fp,
                                              const pgp_hash_alg_t        kdf_hash,
                                              const pgp_symm_alg_t        wrap_alg);

void pad_pkcs7(rnp::secure_bytes &buf, uint8_t padding);

bool unpad_pkcs7(rnp::secure_bytes &buf);
} // namespace ecdh
} // namespace pgp

#endif // ECDH_UTILS_H_