mirror of
https://github.com/SerenityOS/serenity.git
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b205c9814a
Because MD5 stored a "Bytes {}" wrapper to its internal data buffer,
it was not actually movable. However, its use in several parts of
the system (such as HashManager) assumed it was, leading to crashes.
Fixes #8135
102 lines
2.6 KiB
C++
102 lines
2.6 KiB
C++
/*
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* Copyright (c) 2020, Ali Mohammad Pur <mpfard@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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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 Hash {
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struct MD5Digest {
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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() const { return Size; }
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};
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namespace MD5Constants {
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constexpr u32 init_A = 0x67452301;
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constexpr u32 init_B = 0xefcdab89;
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constexpr u32 init_C = 0x98badcfe;
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constexpr u32 init_D = 0x10325476;
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constexpr u32 S11 = 7;
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constexpr u32 S12 = 12;
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constexpr u32 S13 = 17;
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constexpr u32 S14 = 22;
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constexpr u32 S21 = 5;
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constexpr u32 S22 = 9;
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constexpr u32 S23 = 14;
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constexpr u32 S24 = 20;
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constexpr u32 S31 = 4;
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constexpr u32 S32 = 11;
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constexpr u32 S33 = 16;
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constexpr u32 S34 = 23;
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constexpr u32 S41 = 6;
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constexpr u32 S42 = 10;
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constexpr u32 S43 = 15;
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constexpr u32 S44 = 21;
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constexpr u8 PADDING[] = {
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0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0
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};
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}
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class MD5 final : public HashFunction<512, MD5Digest> {
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public:
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using HashFunction::update;
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virtual void update(const u8*, size_t) override;
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virtual DigestType digest() override;
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virtual DigestType peek() override;
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virtual String class_name() const override { return "MD5"; }
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inline static DigestType hash(const u8* data, size_t length)
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{
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MD5 md5;
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md5.update(data, length);
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return md5.digest();
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}
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inline static DigestType hash(const ByteBuffer& buffer) { return hash(buffer.data(), buffer.size()); }
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inline static DigestType hash(const StringView& buffer) { return hash((const u8*)buffer.characters_without_null_termination(), buffer.length()); }
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inline virtual void reset() override
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{
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m_A = MD5Constants::init_A;
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m_B = MD5Constants::init_B;
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m_C = MD5Constants::init_C;
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m_D = MD5Constants::init_D;
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m_count[0] = 0;
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m_count[1] = 0;
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__builtin_memset(m_data_buffer, 0, sizeof(m_data_buffer));
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}
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private:
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inline void transform(const u8*);
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static void encode(const u32* from, u8* to, size_t length);
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static void decode(const u8* from, u32* to, size_t length);
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u32 m_A { MD5Constants::init_A }, m_B { MD5Constants::init_B }, m_C { MD5Constants::init_C }, m_D { MD5Constants::init_D };
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u32 m_count[2] { 0, 0 };
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u8 m_data_buffer[64] {};
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};
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}
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}
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