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/*
* 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 CRYPTO_HKDF_H_
#define CRYPTO_HKDF_H_
#include "config.h"
#if defined(ENABLE_CRYPTO_REFRESH)
#include <repgp/repgp_def.h>
#include "types.h"
namespace rnp {
class Hkdf {
/*HKDF is used with SHA256 as hash algorithm, the session key as Initial Keying Material
* (IKM), the salt as salt, and the Packet Tag in OpenPGP format encoding (bits 7 and 6
* set, bits 5-0 carry the packet tag), version number, cipher algorithm octet, AEAD
* algorithm octet, and chunk size octet as info parameter.*/
protected:
pgp_hash_alg_t hash_alg_;
size_t size_;
Hkdf(pgp_hash_alg_t hash_alg) : hash_alg_(hash_alg)
{
size_ = Hash::size(hash_alg);
};
public:
static std::unique_ptr<Hkdf> create(pgp_hash_alg_t alg);
pgp_hash_alg_t alg() const;
size_t size() const;
virtual void extract_expand(const uint8_t *salt,
size_t salt_len,
const uint8_t *ikm,
size_t ikm_len,
const uint8_t *info,
size_t info_len,
uint8_t * output_buf,
size_t output_length) = 0;
virtual ~Hkdf();
};
} // namespace rnp
#endif
#endif