mirror of
https://github.com/Atmosphere-NX/Atmosphere
synced 2024-12-25 14:11:15 +00:00
270 lines
13 KiB
C++
270 lines
13 KiB
C++
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/*
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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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#include "crypto_aes_impl.arch.x64.hpp"
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namespace ams::crypto::impl {
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template<> void CtrModeImpl<AesEncryptor128>::ProcessBlocks(u8 *dst, const u8 *src, size_t num_blocks) {
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/* Check pre-conditions. */
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AMS_ASSERT(src != nullptr);
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AMS_ASSERT(dst != nullptr);
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/* If we have aes-ni, use an optimized impl. */
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if (IsAesNiAvailable()) {
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/* Load all keys into sse2 registers. */
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const u8 *raw_round_keys = m_block_cipher->GetRoundKey();
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const __m128i round_keys[AesEncryptor128::RoundKeySize / BlockSize] = {
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_mm_loadu_si128(reinterpret_cast<const __m128i *>(raw_round_keys + BlockSize * 0)),
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_mm_loadu_si128(reinterpret_cast<const __m128i *>(raw_round_keys + BlockSize * 1)),
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_mm_loadu_si128(reinterpret_cast<const __m128i *>(raw_round_keys + BlockSize * 2)),
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_mm_loadu_si128(reinterpret_cast<const __m128i *>(raw_round_keys + BlockSize * 3)),
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_mm_loadu_si128(reinterpret_cast<const __m128i *>(raw_round_keys + BlockSize * 4)),
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_mm_loadu_si128(reinterpret_cast<const __m128i *>(raw_round_keys + BlockSize * 5)),
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_mm_loadu_si128(reinterpret_cast<const __m128i *>(raw_round_keys + BlockSize * 6)),
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_mm_loadu_si128(reinterpret_cast<const __m128i *>(raw_round_keys + BlockSize * 7)),
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_mm_loadu_si128(reinterpret_cast<const __m128i *>(raw_round_keys + BlockSize * 8)),
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_mm_loadu_si128(reinterpret_cast<const __m128i *>(raw_round_keys + BlockSize * 9)),
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_mm_loadu_si128(reinterpret_cast<const __m128i *>(raw_round_keys + BlockSize * 10)),
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};
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static_assert(AesEncryptor128::RoundKeySize / BlockSize == 11);
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/* Declare constant for counter math. */
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const __m128i One = _mm_setr_epi8(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1);
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/* Process eight blocks at a time, while we can. */
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constexpr const auto UnrolledBlockCount = 8;
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constexpr const auto CounterThreshold = static_cast<u8>(0x100 - UnrolledBlockCount);
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/* Load the counter. */
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auto counter = _mm_loadu_si128(reinterpret_cast<const __m128i *>(m_counter));
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size_t cur_blocks;
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for (cur_blocks = 0; cur_blocks + UnrolledBlockCount <= num_blocks; cur_blocks += UnrolledBlockCount) {
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__m128i b0;
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__m128i b1;
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__m128i b2;
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__m128i b3;
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__m128i b4;
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__m128i b5;
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__m128i b6;
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__m128i b7;
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__m128i key = round_keys[0];
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/* Get the last byte of the block. */
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static_assert(util::IsLittleEndian());
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const u8 counter_val = _mm_extract_epi16(counter, 7) >> BITSIZEOF(u8);
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/* Do initial encryption of each block. */
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if (CounterThreshold <= counter_val) {
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/* We'll overwrap, so take slow path for counter. */
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_mm_storeu_si128(reinterpret_cast<__m128i *>(m_counter), counter);
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b0 = _mm_xor_si128(_mm_loadu_si128(reinterpret_cast<const __m128i *>(m_counter)), key);
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this->IncrementCounter();
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b1 = _mm_xor_si128(_mm_loadu_si128(reinterpret_cast<const __m128i *>(m_counter)), key);
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this->IncrementCounter();
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b2 = _mm_xor_si128(_mm_loadu_si128(reinterpret_cast<const __m128i *>(m_counter)), key);
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this->IncrementCounter();
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b3 = _mm_xor_si128(_mm_loadu_si128(reinterpret_cast<const __m128i *>(m_counter)), key);
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this->IncrementCounter();
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b4 = _mm_xor_si128(_mm_loadu_si128(reinterpret_cast<const __m128i *>(m_counter)), key);
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this->IncrementCounter();
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b5 = _mm_xor_si128(_mm_loadu_si128(reinterpret_cast<const __m128i *>(m_counter)), key);
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this->IncrementCounter();
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b6 = _mm_xor_si128(_mm_loadu_si128(reinterpret_cast<const __m128i *>(m_counter)), key);
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this->IncrementCounter();
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b7 = _mm_xor_si128(_mm_loadu_si128(reinterpret_cast<const __m128i *>(m_counter)), key);
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this->IncrementCounter();
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counter = _mm_loadu_si128(reinterpret_cast<const __m128i *>(m_counter));
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} else {
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/* We can take the fast path for the counter. */
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b0 = _mm_xor_si128(counter, key);
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counter = _mm_add_epi64(counter, One);
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b1 = _mm_xor_si128(counter, key);
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counter = _mm_add_epi64(counter, One);
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b2 = _mm_xor_si128(counter, key);
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counter = _mm_add_epi64(counter, One);
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b3 = _mm_xor_si128(counter, key);
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counter = _mm_add_epi64(counter, One);
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b4 = _mm_xor_si128(counter, key);
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counter = _mm_add_epi64(counter, One);
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b5 = _mm_xor_si128(counter, key);
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counter = _mm_add_epi64(counter, One);
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b6 = _mm_xor_si128(counter, key);
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counter = _mm_add_epi64(counter, One);
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b7 = _mm_xor_si128(counter, key);
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counter = _mm_add_epi64(counter, One);
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}
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/* Do encryption for all rounds. */
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key = round_keys[1];
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b0 = _mm_aesenc_si128(b0, key);
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b1 = _mm_aesenc_si128(b1, key);
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b2 = _mm_aesenc_si128(b2, key);
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b3 = _mm_aesenc_si128(b3, key);
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b4 = _mm_aesenc_si128(b4, key);
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b5 = _mm_aesenc_si128(b5, key);
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b6 = _mm_aesenc_si128(b6, key);
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b7 = _mm_aesenc_si128(b7, key);
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key = round_keys[2];
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b0 = _mm_aesenc_si128(b0, key);
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b1 = _mm_aesenc_si128(b1, key);
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b2 = _mm_aesenc_si128(b2, key);
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b3 = _mm_aesenc_si128(b3, key);
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b4 = _mm_aesenc_si128(b4, key);
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b5 = _mm_aesenc_si128(b5, key);
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b6 = _mm_aesenc_si128(b6, key);
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b7 = _mm_aesenc_si128(b7, key);
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key = round_keys[3];
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b0 = _mm_aesenc_si128(b0, key);
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b1 = _mm_aesenc_si128(b1, key);
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b2 = _mm_aesenc_si128(b2, key);
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b3 = _mm_aesenc_si128(b3, key);
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b4 = _mm_aesenc_si128(b4, key);
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b5 = _mm_aesenc_si128(b5, key);
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b6 = _mm_aesenc_si128(b6, key);
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b7 = _mm_aesenc_si128(b7, key);
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key = round_keys[4];
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b0 = _mm_aesenc_si128(b0, key);
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b1 = _mm_aesenc_si128(b1, key);
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b2 = _mm_aesenc_si128(b2, key);
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b3 = _mm_aesenc_si128(b3, key);
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b4 = _mm_aesenc_si128(b4, key);
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b5 = _mm_aesenc_si128(b5, key);
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b6 = _mm_aesenc_si128(b6, key);
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b7 = _mm_aesenc_si128(b7, key);
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key = round_keys[5];
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b0 = _mm_aesenc_si128(b0, key);
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b1 = _mm_aesenc_si128(b1, key);
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b2 = _mm_aesenc_si128(b2, key);
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b3 = _mm_aesenc_si128(b3, key);
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b4 = _mm_aesenc_si128(b4, key);
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b5 = _mm_aesenc_si128(b5, key);
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b6 = _mm_aesenc_si128(b6, key);
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b7 = _mm_aesenc_si128(b7, key);
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key = round_keys[6];
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b0 = _mm_aesenc_si128(b0, key);
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b1 = _mm_aesenc_si128(b1, key);
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b2 = _mm_aesenc_si128(b2, key);
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b3 = _mm_aesenc_si128(b3, key);
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b4 = _mm_aesenc_si128(b4, key);
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b5 = _mm_aesenc_si128(b5, key);
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b6 = _mm_aesenc_si128(b6, key);
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b7 = _mm_aesenc_si128(b7, key);
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key = round_keys[7];
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b0 = _mm_aesenc_si128(b0, key);
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b1 = _mm_aesenc_si128(b1, key);
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b2 = _mm_aesenc_si128(b2, key);
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b3 = _mm_aesenc_si128(b3, key);
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b4 = _mm_aesenc_si128(b4, key);
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b5 = _mm_aesenc_si128(b5, key);
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b6 = _mm_aesenc_si128(b6, key);
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b7 = _mm_aesenc_si128(b7, key);
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key = round_keys[8];
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b0 = _mm_aesenc_si128(b0, key);
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b1 = _mm_aesenc_si128(b1, key);
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b2 = _mm_aesenc_si128(b2, key);
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b3 = _mm_aesenc_si128(b3, key);
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b4 = _mm_aesenc_si128(b4, key);
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b5 = _mm_aesenc_si128(b5, key);
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b6 = _mm_aesenc_si128(b6, key);
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b7 = _mm_aesenc_si128(b7, key);
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key = round_keys[9];
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b0 = _mm_aesenc_si128(b0, key);
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b1 = _mm_aesenc_si128(b1, key);
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b2 = _mm_aesenc_si128(b2, key);
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b3 = _mm_aesenc_si128(b3, key);
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b4 = _mm_aesenc_si128(b4, key);
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b5 = _mm_aesenc_si128(b5, key);
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b6 = _mm_aesenc_si128(b6, key);
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b7 = _mm_aesenc_si128(b7, key);
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key = round_keys[10];
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b0 = _mm_aesenclast_si128(b0, key);
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b1 = _mm_aesenclast_si128(b1, key);
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b2 = _mm_aesenclast_si128(b2, key);
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b3 = _mm_aesenclast_si128(b3, key);
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b4 = _mm_aesenclast_si128(b4, key);
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b5 = _mm_aesenclast_si128(b5, key);
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b6 = _mm_aesenclast_si128(b6, key);
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b7 = _mm_aesenclast_si128(b7, key);
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/* Write the blocks. */
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_mm_storeu_si128(reinterpret_cast<__m128i *>(dst + BlockSize * 0), _mm_xor_si128(_mm_loadu_si128(reinterpret_cast<const __m128i *>(src + BlockSize * 0)), b0));
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_mm_storeu_si128(reinterpret_cast<__m128i *>(dst + BlockSize * 1), _mm_xor_si128(_mm_loadu_si128(reinterpret_cast<const __m128i *>(src + BlockSize * 1)), b1));
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_mm_storeu_si128(reinterpret_cast<__m128i *>(dst + BlockSize * 2), _mm_xor_si128(_mm_loadu_si128(reinterpret_cast<const __m128i *>(src + BlockSize * 2)), b2));
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_mm_storeu_si128(reinterpret_cast<__m128i *>(dst + BlockSize * 3), _mm_xor_si128(_mm_loadu_si128(reinterpret_cast<const __m128i *>(src + BlockSize * 3)), b3));
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_mm_storeu_si128(reinterpret_cast<__m128i *>(dst + BlockSize * 4), _mm_xor_si128(_mm_loadu_si128(reinterpret_cast<const __m128i *>(src + BlockSize * 4)), b4));
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_mm_storeu_si128(reinterpret_cast<__m128i *>(dst + BlockSize * 5), _mm_xor_si128(_mm_loadu_si128(reinterpret_cast<const __m128i *>(src + BlockSize * 5)), b5));
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_mm_storeu_si128(reinterpret_cast<__m128i *>(dst + BlockSize * 6), _mm_xor_si128(_mm_loadu_si128(reinterpret_cast<const __m128i *>(src + BlockSize * 6)), b6));
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_mm_storeu_si128(reinterpret_cast<__m128i *>(dst + BlockSize * 7), _mm_xor_si128(_mm_loadu_si128(reinterpret_cast<const __m128i *>(src + BlockSize * 7)), b7));
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src += BlockSize * UnrolledBlockCount;
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dst += BlockSize * UnrolledBlockCount;
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}
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/* Store the updated counter. */
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_mm_storeu_si128(reinterpret_cast<__m128i *>(m_counter), counter);
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/* Process blocks one at a time. */
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for (/* ... */; cur_blocks < num_blocks; ++cur_blocks) {
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/* Load current counter. */
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__m128i b = _mm_loadu_si128(reinterpret_cast<const __m128i *>(m_counter));
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/* Do aes rounds. */
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b = _mm_xor_si128(b, round_keys[0]);
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b = _mm_aesenc_si128(b, round_keys[1]);
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b = _mm_aesenc_si128(b, round_keys[2]);
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b = _mm_aesenc_si128(b, round_keys[3]);
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b = _mm_aesenc_si128(b, round_keys[4]);
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b = _mm_aesenc_si128(b, round_keys[5]);
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b = _mm_aesenc_si128(b, round_keys[6]);
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b = _mm_aesenc_si128(b, round_keys[7]);
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b = _mm_aesenc_si128(b, round_keys[8]);
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b = _mm_aesenc_si128(b, round_keys[9]);
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b = _mm_aesenclast_si128(b, round_keys[10]);
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/* Write the block. */
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_mm_storeu_si128(reinterpret_cast<__m128i *>(dst), _mm_xor_si128(_mm_loadu_si128(reinterpret_cast<const __m128i *>(src)), b));
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/* Advance. */
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src += BlockSize;
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dst += BlockSize;
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this->IncrementCounter();
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}
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} else {
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/* Fall back to the default implementation. */
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while (num_blocks--) {
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this->ProcessBlock(dst, src, BlockSize);
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dst += BlockSize;
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src += BlockSize;
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}
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}
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}
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}
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