mirror of
https://github.com/RGBCube/serenity
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76 lines
2.4 KiB
C++
76 lines
2.4 KiB
C++
/*
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* Copyright (c) 2020, Ali Mohammad Pur <ali.mpfard@gmail.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/String.h>
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#include <AK/Types.h>
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#include <LibCrypto/Hash/HashFunction.h>
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namespace Crypto {
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namespace Authentication {
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void galois_multiply(u32 (&z)[4], const u32 (&x)[4], const u32 (&y)[4]);
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struct GHashDigest {
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constexpr static size_t Size = 16;
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u8 data[Size];
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const u8* immutable_data() const { return data; }
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size_t data_length() { return Size; }
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};
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class GHash final {
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public:
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using TagType = GHashDigest;
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template<size_t N>
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explicit GHash(const char (&key)[N])
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: GHash({ key, N })
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{
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}
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explicit GHash(const ReadonlyBytes& key)
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{
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for (size_t i = 0; i < 16; i += 4)
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m_key[i / 4] = AK::convert_between_host_and_big_endian(*(const u32*)(key.offset(i)));
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}
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constexpr static size_t digest_size() { return TagType::Size; }
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String class_name() const { return "GHash"; }
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TagType process(ReadonlyBytes aad, ReadonlyBytes cipher);
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private:
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inline void transform(ReadonlyBytes, ReadonlyBytes);
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u32 m_key[4];
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};
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}
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}
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