103 lines
2.7 KiB
C
103 lines
2.7 KiB
C
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/*
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* This file is part of the ZoneMinder Project. See AUTHORS file for Copyright information
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef ZONEMINDER_SRC_ZM_CRYPTO_GENERICS_H_
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#define ZONEMINDER_SRC_ZM_CRYPTO_GENERICS_H_
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#include "zm_define.h"
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#include "zm_utils.h"
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#include <array>
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#include <cstring>
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namespace zm {
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namespace crypto {
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namespace impl {
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enum class HashAlgorithms {
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kMD5
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};
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template<HashAlgorithms Algorithm>
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struct HashAlgorithm;
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template<>
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struct HashAlgorithm<HashAlgorithms::kMD5> {
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static constexpr size_t digest_length = 16;
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};
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template<typename Impl, HashAlgorithms Algorithm>
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class GenericHash {
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public:
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static constexpr size_t DIGEST_LENGTH = HashAlgorithm<Algorithm>::digest_length;
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using Digest = std::array<uint8, DIGEST_LENGTH>;
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static Digest GetDigestOf(uint8 const *data, size_t len) {
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Impl hash;
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hash.UpdateData(data, len);
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hash.Finalize();
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return hash.GetDigest();
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}
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template<typename... Ts>
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static Digest GetDigestOf(Ts &&... pack) {
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Impl hash;
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UpdateData(hash, std::forward<Ts>(pack)...);
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hash.Finalize();
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return hash.GetDigest();
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}
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void UpdateData(const uint8 *data, size_t length) {
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static_cast<Impl &>(*this).DoUpdateData(data, length);
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}
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void UpdateData(const std::string &str) {
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UpdateData(reinterpret_cast<const uint8 *>(str.c_str()), str.size());
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}
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void UpdateData(const char *str) {
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UpdateData(reinterpret_cast<const uint8 *>(str), strlen(str));
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}
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template<typename Container>
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void UpdateData(Container const &c) {
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UpdateData(ZM::data(c), ZM::size(c));
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}
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void Finalize() {
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static_cast<Impl &>(*this).DoFinalize();
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}
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const Digest &GetDigest() const { return digest_; }
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protected:
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Digest digest_ = {};
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private:
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template<typename T>
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static void UpdateData(Impl &hash, T const &data) {
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hash.UpdateData(data);
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}
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template<typename T, typename... TRest>
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static void UpdateData(Impl &hash, T const &data, TRest &&... rest) {
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hash.UpdateData(data);
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UpdateData(hash, std::forward<TRest>(rest)...);
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}
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};
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}
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}
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}
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#endif //ZONEMINDER_SRC_ZM_CRYPTO_GENERICS_H_
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