sp800_108.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_SP800_108_HPP
#define CRYPTO3_KDF_SP800_108_HPP
 
#include <nil/crypto3/kdf/detail/sp800_108/sp800_108_functions.hpp>
 
#include <vector>
 
namespace nil {
    namespace crypto3 {
        namespace kdf {
            namespace mode {
                template<typename MessageAuthenticationCode>
                struct sp800_108_mode {
                    typedef MessageAuthenticationCode mac_type;
                };
                template<typename MessageAuthenticationCode>
                struct counter : sp800_108_mode<MessageAuthenticationCode> {
                    typedef typename sp800_108_mode<MessageAuthenticationCode>::mac_type mac_type;
 
                    constexpr static const std::size_t secret_bits = mac_type::key_bits;
                    typedef typename mac_type::key_type secret_type;
 
                    counter(const secret_type &key) : mac(key) {
                    }
 
                    inline void process() {
                        const std::size_t prf_len = m_prf->output_length();
                        const uint8_t delim = 0;
                        const uint32_t length = static_cast<uint32_t>(key_len * 8);
 
                        uint8_t *p = key;
                        uint32_t counter = 1;
                        uint8_t be_len[4] = {0};
                        std::vector<uint8_t> tmp;
 
                        store_be(length, be_len);
                        m_prf->set_key(secret, secret_len);
 
                        while (p < key + key_len && counter != 0) {
                            const std::size_t to_copy = std::min<std::size_t>(key + key_len - p, prf_len);
                            uint8_t be_cnt[4] = {0};
 
                            store_be(counter, be_cnt);
 
                            m_prf->update(be_cnt, 4);
                            m_prf->update(label, label_len);
                            m_prf->update(delim);
                            m_prf->update(salt, salt_len);
                            m_prf->update(be_len, 4);
                            m_prf->final(tmp);
 
                            copy_mem(p, tmp.data(), to_copy);
                            p += to_copy;
 
                            ++counter;
                            if (counter == 0) {
                                throw std::invalid_argument("Can't process more than 4GB");
                            }
                        }
 
                        return key_len;
                    }
 
                protected:
                    mac_type mac;
                };
 
                template<typename MessageAuthenticationCode>
                struct feedback : sp800_108_mode<MessageAuthenticationCode> {
                    typedef typename sp800_108_mode<MessageAuthenticationCode>::mac_type mac_type;
 
                    constexpr static const std::size_t secret_bits = mac_type::key_bits;
                    typedef typename mac_type::key_type secret_type;
 
                    feedback(const secret_type &key) : mac(key) {
                    }
 
                    inline void process() {
                        const uint32_t length = static_cast<uint32_t>(key_len * 8);
                        const std::size_t prf_len = m_prf->output_length();
                        const std::size_t iv_len = (salt_len >= prf_len ? prf_len : 0);
                        const uint8_t delim = 0;
 
                        uint8_t *p = key;
                        uint32_t counter = 1;
                        uint8_t be_len[4] = {0};
                        std::vector<uint8_t> prev(salt, salt + iv_len);
                        std::vector<uint8_t> ctx(salt + iv_len, salt + salt_len);
 
                        store_be(length, be_len);
                        m_prf->set_key(secret, secret_len);
 
                        while (p < key + key_len && counter != 0) {
                            const std::size_t to_copy = std::min<std::size_t>(key + key_len - p, prf_len);
                            uint8_t be_cnt[4] = {0};
 
                            store_be(counter, be_cnt);
 
                            m_prf->update(prev);
                            m_prf->update(be_cnt, 4);
                            m_prf->update(label, label_len);
                            m_prf->update(delim);
                            m_prf->update(ctx);
                            m_prf->update(be_len, 4);
                            m_prf->final(prev);
 
                            copy_mem(p, prev.data(), to_copy);
                            p += to_copy;
 
                            ++counter;
 
                            if (counter == 0) {
                                throw std::invalid_argument("Can't process more than 4GB");
                            }
                        }
 
                        return key_len;
                    }
 
                protected:
                    mac_type mac;
                };
 
                template<typename MessageAuthenticationCode>
                struct pipeline : sp800_108_mode<MessageAuthenticationCode> {
                    typedef typename sp800_108_mode<MessageAuthenticationCode>::mac_type mac_type;
 
                    constexpr static const std::size_t secret_bits = mac_type::key_bits;
                    typedef typename mac_type::key_type secret_type;
 
                    pipeline(const secret_type &key) : mac(key) {
                    }
 
                    inline void process() {
                        const uint32_t length = static_cast<uint32_t>(key_len * 8);
                        const std::size_t prf_len = m_prf->output_length();
                        const uint8_t delim = 0;
 
                        uint8_t *p = key;
                        uint32_t counter = 1;
                        uint8_t be_len[4] = {0};
                        std::vector<uint8_t> ai, ki;
 
                        store_be(length, be_len);
                        m_prf->set_key(secret, secret_len);
 
                        // A(0)
                        std::copy(label, label + label_len, std::back_inserter(ai));
                        ai.emplace_back(delim);
                        std::copy(salt, salt + salt_len, std::back_inserter(ai));
                        std::copy(be_len, be_len + 4, std::back_inserter(ai));
 
                        while (p < key + key_len && counter != 0) {
                            // A(i)
                            m_prf->update(ai);
                            m_prf->final(ai);
 
                            // K(i)
                            const std::size_t to_copy = std::min<std::size_t>(key + key_len - p, prf_len);
                            uint8_t be_cnt[4] = {0};
 
                            store_be(counter, be_cnt);
 
                            m_prf->update(ai);
                            m_prf->update(be_cnt, 4);
                            m_prf->update(label, label_len);
                            m_prf->update(delim);
                            m_prf->update(salt, salt_len);
                            m_prf->update(be_len, 4);
                            m_prf->final(ki);
 
                            copy_mem(p, ki.data(), to_copy);
                            p += to_copy;
 
                            ++counter;
 
                            if (counter == 0) {
                                throw std::invalid_argument("Can't process more than 4GB");
                            }
                        }
 
                        return key_len;
                    }
 
                protected:
                    mac_type mac;
                };
            }    // namespace mode
 
            template<typename MessageAuthenticationCode, template<typename> class Mode>
            class sp800_108 {
                typedef detail::sp800_108_functions<MessageAuthenticationCode, Mode> policy_type;
 
            public:
                typedef typename policy_type::mode_type mode_type;
                typedef typename policy_type::mac_type mac_type;
 
                constexpr static const std::size_t secret_bits = mode_type::secret_bits;
                typedef typename mode_type::secret_type secret_type;
 
                sp800_108(const secret_type &key) : mode(key) {
                }
 
                void process() {
                    mode.process();
                }
 
            protected:
                mode_type mode;
            };
        }    // namespace kdf
    }        // namespace crypto3
}    // namespace nil
 
#endif