mirror of
https://github.com/Atmosphere-NX/Atmosphere
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80 lines
2.5 KiB
C++
80 lines
2.5 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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#include <vapours.hpp>
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namespace ams::crypto::impl {
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void CbcMacImpl::ProcessBlock(const void *data) {
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/* Procses the block. */
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const u8 *data8 = static_cast<const u8 *>(data);
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u8 block[BlockSize];
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for (size_t i = 0; i < BlockSize; ++i) {
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block[i] = data8[i] ^ m_mac[i];
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}
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m_cipher_function(m_mac, block, m_cipher_context);
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}
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void CbcMacImpl::ProcessPartialData(const void *data, size_t size) {
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/* Copy in the data. */
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std::memcpy(m_buffer + m_buffered_bytes, data, size);
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m_buffered_bytes += size;
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}
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void CbcMacImpl::ProcessRemainingData(const void *data, size_t size) {
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/* If we have a block remaining, process it. */
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if (m_buffered_bytes == BlockSize) {
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this->ProcessBlock(m_buffer);
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m_buffered_bytes = 0;
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}
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/* Copy the remaining data. */
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std::memcpy(m_buffer, data, size);
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m_buffered_bytes = size;
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}
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void CbcMacImpl::GetMac(void *mac, size_t mac_size) {
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/* Check pre-conditions. */
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AMS_ASSERT(m_state == State_Initialized || m_state == State_Done);
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AMS_ASSERT(mac_size >= BlockSize);
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/* Ensure we're done. */
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if (m_state == State_Initialized) {
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if (m_buffered_bytes == BlockSize) {
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this->ProcessBlock(m_buffer);
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m_buffered_bytes = 0;
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}
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m_state = State_Done;
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}
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/* Copy out the mac. */
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std::memcpy(mac, m_mac, sizeof(m_mac));
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}
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void CbcMacImpl::MaskBufferedData(const void *data, size_t size) {
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/* Check pre-conditions. */
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AMS_ASSERT(m_buffered_bytes == BlockSize);
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AMS_ASSERT(size == BlockSize);
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AMS_UNUSED(size);
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/* Mask the data. */
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for (size_t i = 0; i < BlockSize; ++i) {
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m_buffer[i] ^= static_cast<const u8 *>(data)[i];
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}
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}
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}
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