kdf1.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
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//---------------------------------------------------------------------------//
 
#ifndef CRYPTO3_KDF_KDF1_HPP
#define CRYPTO3_KDF_KDF1_HPP
 
#include <nil/crypto3/kdf/detail/kdf1/kdf1_functions.hpp>
#include <vector>
 
namespace nil {
    namespace crypto3 {
        namespace kdf {
            template<typename Hash>
            class kdf1 {
                typedef detail::kdf1_functions<Hash> policy_type;
 
            public:
                typedef typename policy_type::hash_type hash_type;
 
                constexpr static const std::size_t digest_bits = policy_type::digest_bits;
                typedef typename policy_type::digest_type digest_type;
 
                constexpr static const std::size_t secret_bits = policy_type::secret_bits;
                typedef typename policy_type::secret_type secret_type;
 
                constexpr static const std::size_t label_bits = policy_type::label_bits;
                typedef typename policy_type::label_type label_type;
 
                constexpr static const std::size_t salt_bits = policy_type::salt_bits;
                typedef typename policy_type::salt_type salt_type;
 
                static inline digest_type process() {
                    digest_type digest;
                    process(digest);
                    return digest;
                }
 
                static void process(digest_type &digest) {
                    m_hash->update(secret, secret_len);
                    m_hash->update(label, label_len);
                    m_hash->update(salt, salt_len);
 
                    if (key_len < m_hash->output_length()) {
                        std::vector<uint8_t> v = m_hash->final();
                        copy_mem(key, v.data(), key_len);
                        return key_len;
                    }
 
                    m_hash->final(key);
                    return m_hash->output_length();
                }
 
            protected:
                hash_type hash;
            };
        }    // namespace kdf
    }        // namespace crypto3
}    // namespace nil
#endif