Atmosphere/libraries/libvapours/source/crypto/impl/crypto_update_impl.hpp

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2020-04-06 06:25:28 +00:00
/*
* Copyright (c) Atmosphère-NX
2020-04-06 06:25:28 +00:00
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <vapours.hpp>
namespace ams::crypto::impl {
template<typename Cipher, typename Self>
void UpdateImpl(Self *self, const void *src, size_t src_size) {
const size_t BlockSize = self->GetBlockSize();
const u8 *src_u8 = static_cast<const u8 *>(src);
size_t remaining = src_size;
if (const size_t buffered = self->GetBufferedDataSize(); buffered > 0) {
const size_t partial = std::min(BlockSize - buffered, remaining);
self->ProcessPartialData(src_u8, partial);
src_u8 += partial;
remaining -= partial;
}
if (remaining >= BlockSize) {
const size_t num_blocks = remaining / BlockSize;
self->template ProcessBlocks<Cipher>(src_u8, num_blocks);
const size_t processed = num_blocks * BlockSize;
src_u8 += processed;
remaining -= processed;
}
if (remaining > 0) {
self->ProcessRemainingData(src_u8, remaining);
}
}
template<typename Cipher, typename Self>
size_t UpdateImpl(Self *self, void *dst, size_t dst_size, const void *src, size_t src_size) {
AMS_UNUSED(dst_size);
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const size_t BlockSize = self->GetBlockSize();
const u8 *src_u8 = static_cast<const u8 *>(src);
u8 *dst_u8 = static_cast<u8 *>(dst);
size_t remaining = src_size;
size_t total_processed = 0;
if (const size_t buffered = self->GetBufferedDataSize(); buffered > 0) {
const size_t partial = std::min(BlockSize - buffered, remaining);
const size_t processed = self->ProcessPartialData(dst_u8, src_u8, partial);
dst_u8 += processed;
total_processed += processed;
src_u8 += partial;
remaining -= partial;
}
if (remaining >= BlockSize) {
const size_t num_blocks = remaining / BlockSize;
const size_t input_size = num_blocks * BlockSize;
const size_t processed = self->template ProcessBlocks<Cipher>(dst_u8, src_u8, num_blocks);
dst_u8 += processed;
total_processed += processed;
src_u8 += input_size;
remaining -= input_size;
}
if (remaining > 0) {
const size_t processed = self->ProcessRemainingData(dst_u8, src_u8, remaining);
total_processed += processed;
}
return total_processed;
}
}