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https://github.com/RGBCube/serenity
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5d180d1f99
(...and ASSERT_NOT_REACHED => VERIFY_NOT_REACHED) Since all of these checks are done in release builds as well, let's rename them to VERIFY to prevent confusion, as everyone is used to assertions being compiled out in release. We can introduce a new ASSERT macro that is specifically for debug checks, but I'm doing this wholesale conversion first since we've accumulated thousands of these already, and it's not immediately obvious which ones are suitable for ASSERT.
139 lines
4 KiB
C++
139 lines
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/Optional.h>
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#include <AK/Span.h>
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#include <AK/Types.h>
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namespace Crypto {
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namespace Cipher {
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enum class Intent {
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Encryption,
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Decryption,
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};
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enum class PaddingMode {
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CMS, // RFC 1423
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RFC5246, // very similar to CMS, but filled with |length - 1|, instead of |length|
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Null,
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// FIXME: We do not implement these yet
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Bit,
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Random,
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Space,
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ZeroLength,
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};
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template<typename B, typename T>
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class Cipher;
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struct CipherBlock {
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public:
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explicit CipherBlock(PaddingMode mode)
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: m_padding_mode(mode)
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{
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}
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static size_t block_size() { VERIFY_NOT_REACHED(); }
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virtual ReadonlyBytes bytes() const = 0;
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virtual void overwrite(ReadonlyBytes) = 0;
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virtual void overwrite(const u8* data, size_t size) { overwrite({ data, size }); }
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virtual void apply_initialization_vector(const u8* ivec) = 0;
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PaddingMode padding_mode() const { return m_padding_mode; }
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void set_padding_mode(PaddingMode mode) { m_padding_mode = mode; }
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template<typename T>
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void put(size_t offset, T value)
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{
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VERIFY(offset + sizeof(T) <= bytes().size());
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auto* ptr = bytes().offset_pointer(offset);
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auto index { 0 };
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VERIFY(sizeof(T) <= 4);
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if constexpr (sizeof(T) > 3)
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ptr[index++] = (u8)(value >> 24);
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if constexpr (sizeof(T) > 2)
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ptr[index++] = (u8)(value >> 16);
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if constexpr (sizeof(T) > 1)
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ptr[index++] = (u8)(value >> 8);
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ptr[index] = (u8)value;
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}
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private:
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virtual Bytes bytes() = 0;
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PaddingMode m_padding_mode;
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};
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struct CipherKey {
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virtual ReadonlyBytes bytes() const = 0;
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static bool is_valid_key_size(size_t) { return false; };
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virtual ~CipherKey() { }
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protected:
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virtual void expand_encrypt_key(ReadonlyBytes user_key, size_t bits) = 0;
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virtual void expand_decrypt_key(ReadonlyBytes user_key, size_t bits) = 0;
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size_t bits { 0 };
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};
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template<typename KeyT = CipherKey, typename BlockT = CipherBlock>
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class Cipher {
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public:
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using KeyType = KeyT;
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using BlockType = BlockT;
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explicit Cipher<KeyT, BlockT>(PaddingMode mode)
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: m_padding_mode(mode)
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{
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}
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virtual const KeyType& key() const = 0;
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virtual KeyType& key() = 0;
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static size_t block_size() { return BlockType::block_size(); }
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PaddingMode padding_mode() const { return m_padding_mode; }
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virtual void encrypt_block(const BlockType& in, BlockType& out) = 0;
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virtual void decrypt_block(const BlockType& in, BlockType& out) = 0;
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virtual String class_name() const = 0;
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private:
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PaddingMode m_padding_mode;
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};
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}
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}
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