SHA256Util.h

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// Copyright 2024 libsese
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
 
#pragma once
 
#include "sese/io/Stream.h"
 
#ifdef _WIN32
#pragma warning(disable : 4251)
#endif
 
namespace sese {
 
struct Bitset32;
 
class SHA256Util {
public:
    using OutputStream = sese::io::OutputStream;
    using InputStream = sese::io::InputStream;
 
    static void encode(const InputStream::Ptr &input, const OutputStream::Ptr &output) noexcept;
    static void encode(InputStream *input, OutputStream *output) noexcept;
 
    static std::unique_ptr<char[]> encode(const InputStream::Ptr &input, bool is_cap = true) noexcept;
    static std::unique_ptr<char[]> encode(InputStream *input, bool is_cap = true) noexcept;
 
private:
    static const Bitset32 K[64];
 
    static void structure(Bitset32 *block) noexcept;
    static void encode(Bitset32 value[8], Bitset32 *block, Bitset32 k) noexcept;
};
} // namespace sese