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https://github.com/Atmosphere-NX/Atmosphere-libs.git
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104 lines
3.5 KiB
C++
104 lines
3.5 KiB
C++
/*
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* Copyright (c) Atmosphère-NX
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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 and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope 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
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <vapours/common.hpp>
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#include <vapours/assert.hpp>
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#include <vapours/util.hpp>
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#include <vapours/crypto/crypto_memory_clear.hpp>
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#include <vapours/crypto/crypto_aes_encryptor.hpp>
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namespace ams::crypto::impl {
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class CbcMacImpl {
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NON_COPYABLE(CbcMacImpl);
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NON_MOVEABLE(CbcMacImpl);
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public:
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static constexpr size_t BlockSize = 0x10;
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private:
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enum State {
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State_None,
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State_Initialized,
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State_Done,
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};
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private:
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u8 m_mac[BlockSize];
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u8 m_buffer[BlockSize];
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size_t m_buffered_bytes;
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const void *m_cipher_context;
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void (*m_cipher_function)(void *dst, const void *src, const void *ctx);
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State m_state;
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public:
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CbcMacImpl() : m_buffered_bytes(0), m_state(State_None) { /* ... */ }
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~CbcMacImpl() {
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ClearMemory(this, sizeof(*this));
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}
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template<typename BlockCipher>
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void Initialize(const BlockCipher *block_cipher) {
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static_assert(BlockCipher::BlockSize == BlockSize);
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/* Set our context. */
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m_cipher_context = block_cipher;
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m_cipher_function = &EncryptBlockCallback<BlockCipher>;
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m_buffered_bytes = 0;
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std::memset(m_mac, 0, sizeof(m_mac));
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m_state = State_Initialized;
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}
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template<typename BlockCipher>
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void Update(const void *data, size_t size) {
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this->UpdateGeneric(data, size);
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}
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template<typename BlockCipher>
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void ProcessBlocks(const void *data, size_t size) {
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this->ProcessBlocksGeneric(data, size);
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}
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size_t GetBlockSize() const {
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return BlockSize;
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}
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size_t GetBufferedDataSize() const {
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return m_buffered_bytes;
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}
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void UpdateGeneric(const void *data, size_t size);
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void ProcessBlocksGeneric(const void *data, size_t num_blocks);
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void ProcessPartialData(const void *data, size_t size);
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void ProcessRemainingData(const void *data, size_t size);
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void GetMac(void *mac, size_t mac_size);
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void MaskBufferedData(const void *data, size_t size);
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private:
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void ProcessBlock(const void *data);
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template<typename BlockCipher>
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static void EncryptBlockCallback(void *dst, const void *src, const void *cipher) {
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static_assert(BlockCipher::BlockSize == BlockSize);
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static_cast<const BlockCipher *>(cipher)->EncryptBlock(dst, BlockCipher::BlockSize, src, BlockCipher::BlockSize);
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}
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};
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template<>
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void CbcMacImpl::Update<AesEncryptor128>(const void *data, size_t size);
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}
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