sp800_56c.hpp

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//---------------------------------------------------------------------------//
// Copyright (c) 2019 Mikhail Komarov <nemo@nil.foundation>
//
// MIT License
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
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//
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// SOFTWARE.
//---------------------------------------------------------------------------//
 
#ifndef CRYPTO3_KDF_SP800_56C_HPP
#define CRYPTO3_KDF_SP800_56C_HPP
 
#include <nil/crypto3/kdf/detail/sp800_56c/sp800_56c_functions.hpp>
 
#include <vector>
 
namespace nil {
    namespace crypto3 {
        namespace kdf {
            template<typename MessageAuthenticationCode, typename KeyDerivationFunction>
            class sp800_56c {
                typedef detail::sp800_56c_functions<MessageAuthenticationCode> policy_type;
 
            public:
                typedef MessageAuthenticationCode mac_type;
                typedef KeyDerivationFunction kdf_type;
 
                constexpr static const std::size_t salt_bits = policy_type::salt_bits;
                typedef typename policy_type::salt_type salt_type;
 
                constexpr static const std::size_t min_key_bits = policy_type::min_key_bits;
                constexpr static const std::size_t max_key_bits = policy_type::max_key_bits;
                typedef typename policy_type::key_type key_type;
 
                sp800_56c(const salt_type &key) : mac(key) {
                }
 
                static void process(const key_type &key) {
                    std::vector<uint8_t> k_dk;
 
                    m_prf->set_key(salt, salt_len);
                    m_prf->update(secret, secret_len);
                    m_prf->final(k_dk);
 
                    // Key Expansion
                    m_exp->kdf(key, key_len, k_dk.data(), k_dk.size(), nullptr, 0, label, label_len);
 
                    return key_len;
                }
 
                mac_type mac;
            };
        }    // namespace kdf
    }        // namespace crypto3
}    // namespace nil
 
#endif