48 lines
1.1 KiB
C++
48 lines
1.1 KiB
C++
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// Copyright 2017 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <algorithm>
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#include <functional>
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#include "core/hw/aes/arithmetic128.h"
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namespace HW {
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namespace AES {
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AESKey Lrot128(const AESKey& in, u32 rot) {
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AESKey out;
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rot %= 128;
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const u32 byte_shift = rot / 8;
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const u32 bit_shift = rot % 8;
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for (u32 i = 0; i < 16; i++) {
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const u32 wrap_index_a = (i + byte_shift) % 16;
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const u32 wrap_index_b = (i + byte_shift + 1) % 16;
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out[i] = ((in[wrap_index_a] << bit_shift) | (in[wrap_index_b] >> (8 - bit_shift))) & 0xFF;
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}
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return out;
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}
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AESKey Add128(const AESKey& a, const AESKey& b) {
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AESKey out;
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u32 carry = 0;
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u32 sum = 0;
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for (int i = 15; i >= 0; i--) {
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sum = a[i] + b[i] + carry;
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carry = sum >> 8;
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out[i] = static_cast<u8>(sum & 0xff);
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}
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return out;
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}
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AESKey Xor128(const AESKey& a, const AESKey& b) {
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AESKey out;
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std::transform(a.cbegin(), a.cend(), b.cbegin(), out.begin(), std::bit_xor<>());
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return out;
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}
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} // namespace AES
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} // namespace HW
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