hash/include/nil/crypto3/hash/detail/md5/md5_policy.hpp

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//---------------------------------------------------------------------------//
// Copyright (c) 2018-2020 Mikhail Komarov <nemo@nil.foundation>
// Copyright (c) 2020 Nikita Kaskov <nbering@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
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//---------------------------------------------------------------------------//
 
#ifndef CRYPTO3_HASH_DETAIL_MD5_POLICY_HPP
#define CRYPTO3_HASH_DETAIL_MD5_POLICY_HPP
 
#include <nil/crypto3/block/md5.hpp>
 
#include <nil/crypto3/detail/static_digest.hpp>
 
namespace nil {
    namespace crypto3 {
        namespace hashes {
            namespace detail {
 
                struct md5_policy {
                    typedef block::md5 block_cipher_type;
 
                    constexpr static const std::size_t word_bits = block_cipher_type::word_bits;
                    typedef typename block_cipher_type::word_type word_type;
 
                    constexpr static const std::size_t state_bits = block_cipher_type::block_bits;
                    constexpr static const std::size_t state_words = block_cipher_type::block_words;
                    typedef typename block_cipher_type::block_type state_type;
 
                    constexpr static const std::size_t block_bits = block_cipher_type::key_bits;
                    constexpr static const std::size_t block_words = block_cipher_type::key_words;
                    typedef typename block_cipher_type::key_type block_type;
 
                    constexpr static const std::size_t length_bits = word_bits * 2;
 
                    typedef typename stream_endian::little_octet_big_bit digest_endian;
 
                    constexpr static const std::size_t digest_bits = state_bits;
                    typedef static_digest<digest_bits> digest_type;
 
                    constexpr static const std::size_t pkcs_id_size = 18;
                    constexpr static const std::size_t pkcs_id_bits = pkcs_id_size * CHAR_BIT;
                    typedef std::array<std::uint8_t, pkcs_id_size> pkcs_id_type;
 
                    constexpr static const pkcs_id_type pkcs_id = {0x30, 0x20, 0x30, 0x0C, 0x06, 0x08,
                                                                   0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D,
                                                                   0x02, 0x05, 0x05, 0x00, 0x04, 0x10};
 
                    struct iv_generator {
                        state_type const &operator()() const {
                            // Same as MD4
                            static state_type const H0 = {{0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476}};
                            return H0;
                        }
                    };
                };
 
            }    // namespace detail
        }        // namespace hashes
    }            // namespace crypto3
}    // namespace nil
 
#endif    // CRYPTO3_HASH_DETAIL_MD5_POLICY_HPP