mirror of
https://github.com/Atmosphere-NX/Atmosphere-libs.git
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107 lines
3.6 KiB
C++
107 lines
3.6 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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template<typename BlockCipher>
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class GcmModeImpl {
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NON_COPYABLE(GcmModeImpl);
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NON_MOVEABLE(GcmModeImpl);
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public:
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static constexpr size_t KeySize = BlockCipher::KeySize;
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static constexpr size_t BlockSize = BlockCipher::BlockSize;
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static constexpr size_t MacSize = BlockCipher::BlockSize;
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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_ProcessingAad,
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State_Encrypting,
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State_Decrypting,
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State_Done,
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};
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struct Block128 {
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u64 hi;
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u64 lo;
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ALWAYS_INLINE void Clear() {
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this->hi = 0;
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this->lo = 0;
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}
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};
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static_assert(util::is_pod<Block128>::value);
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static_assert(sizeof(Block128) == 0x10);
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union Block {
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Block128 block_128;
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u32 block_32[4];
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u8 block_8[16];
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};
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static_assert(util::is_pod<Block>::value);
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static_assert(sizeof(Block) == 0x10);
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using CipherFunction = void (*)(void *dst_block, const void *src_block, const void *ctx);
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private:
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State m_state;
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const BlockCipher *m_block_cipher;
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CipherFunction m_cipher_func;
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u8 m_pad[sizeof(u64)];
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Block m_block_x;
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Block m_block_y;
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Block m_block_ek;
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Block m_block_ek0;
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Block m_block_tmp;
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size_t m_aad_size;
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size_t m_msg_size;
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u32 m_aad_remaining;
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u32 m_msg_remaining;
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u32 m_counter;
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Block m_h_mult_blocks[16];
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public:
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GcmModeImpl() : m_state(State_None) { /* ... */ }
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~GcmModeImpl() {
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ClearMemory(this, sizeof(*this));
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}
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void Initialize(const BlockCipher *block_cipher);
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void Reset(const void *iv, size_t iv_size);
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void UpdateAad(const void *aad, size_t aad_size);
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size_t UpdateEncrypt(void *dst, size_t dst_size, const void *src, size_t src_size);
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size_t UpdateDecrypt(void *dst, size_t dst_size, const void *src, size_t src_size);
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void GetMac(void *dst, size_t dst_size);
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private:
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static void ProcessBlock(void *dst_block, const void *src_block, const void *ctx) {
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static_cast<const BlockCipher *>(ctx)->EncryptBlock(dst_block, BlockSize, src_block, BlockSize);
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}
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void InitializeHashKey();
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void ComputeMac(bool encrypt);
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};
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}
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