mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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240 lines
8.5 KiB
C++
240 lines
8.5 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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namespace {
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constexpr auto NumRounds = 24;
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constexpr const u64 IotaRoundConstant[NumRounds] = {
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UINT64_C(0x0000000000000001), UINT64_C(0x0000000000008082),
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UINT64_C(0x800000000000808A), UINT64_C(0x8000000080008000),
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UINT64_C(0x000000000000808B), UINT64_C(0x0000000080000001),
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UINT64_C(0x8000000080008081), UINT64_C(0x8000000000008009),
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UINT64_C(0x000000000000008A), UINT64_C(0x0000000000000088),
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UINT64_C(0x0000000080008009), UINT64_C(0x000000008000000A),
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UINT64_C(0x000000008000808B), UINT64_C(0x800000000000008B),
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UINT64_C(0x8000000000008089), UINT64_C(0x8000000000008003),
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UINT64_C(0x8000000000008002), UINT64_C(0x8000000000000080),
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UINT64_C(0x000000000000800A), UINT64_C(0x800000008000000A),
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UINT64_C(0x8000000080008081), UINT64_C(0x8000000000008080),
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UINT64_C(0x0000000080000001), UINT64_C(0x8000000080008008)
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};
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constexpr const int RhoShiftBit[NumRounds] = {
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1, 3, 6, 10, 15, 21, 28, 36,
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45, 55, 2, 14, 27, 41, 56, 8,
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25, 43, 62, 18, 39, 61, 20, 44
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};
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constexpr const int RhoNextIndex[NumRounds] = {
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10, 7, 11, 17, 18, 3, 5, 16,
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8, 21, 24, 4, 15, 23, 19, 13,
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12, 2, 20, 14, 22, 9, 6, 1
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};
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}
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template<size_t HashSize>
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void Sha3Impl<HashSize>::Initialize() {
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/* Clear internal state. */
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std::memset(m_internal_state, 0, sizeof(m_internal_state));
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/* Reset buffered bytes. */
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m_buffered_bytes = 0;
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/* Set state. */
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m_state = State_Initialized;
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}
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template<size_t HashSize>
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void Sha3Impl<HashSize>::Update(const void *data, size_t size) {
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/* Verify we're in a state to update. */
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AMS_ASSERT(m_state == State_Initialized);
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/* Process we have anything buffered. */
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const u8 *data8 = static_cast<const u8 *>(data);
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size_t remaining = size;
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if (m_buffered_bytes > 0) {
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/* Determine how much we can copy. */
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const size_t copy_size = std::min(BlockSize - m_buffered_bytes, remaining);
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/* Mix the bytes into our state. */
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u8 *dst8 = reinterpret_cast<u8 *>(m_internal_state) + m_buffered_bytes;
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for (size_t i = 0; i < copy_size; ++i) {
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dst8[i] ^= data8[i];
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}
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/* Advance. */
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data8 += copy_size;
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remaining -= copy_size;
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m_buffered_bytes += copy_size;
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/* Process a block, if we filled one. */
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if (m_buffered_bytes == BlockSize) {
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this->ProcessBlock();
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m_buffered_bytes = 0;
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}
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}
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/* Process blocks, if we have any. */
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while (remaining >= BlockSize) {
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/* Mix the bytes into our state. */
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u8 *dst8 = reinterpret_cast<u8 *>(m_internal_state);
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for (size_t i = 0; i < BlockSize; ++i) {
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dst8[i] ^= data8[i];
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}
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this->ProcessBlock();
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data8 += BlockSize;
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remaining -= BlockSize;
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}
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/* Copy any leftover data to our buffer. */
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if (remaining > 0) {
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u8 *dst8 = reinterpret_cast<u8 *>(m_internal_state);
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for (size_t i = 0; i < remaining; ++i) {
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dst8[i] ^= data8[i];
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}
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m_buffered_bytes = remaining;
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}
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}
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template<size_t HashSize>
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void Sha3Impl<HashSize>::GetHash(void *dst, size_t size) {
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/* Verify we're in a state to get hash. */
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AMS_ASSERT(m_state == State_Initialized || m_state == State_Done);
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AMS_ASSERT(size >= HashSize);
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AMS_UNUSED(size);
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/* If we need to, process the last block. */
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if (m_state == State_Initialized) {
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this->ProcessLastBlock();
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m_state = State_Done;
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}
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/* Copy the output hash. */
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std::memcpy(dst, m_internal_state, HashSize);
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}
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template<size_t HashSize>
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void Sha3Impl<HashSize>::InitializeWithContext(const Sha3Context *context) {
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/* Check the context is for the right hash size. */
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AMS_ASSERT(context->hash_size == HashSize);
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/* Set buffered bytes. */
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m_buffered_bytes = context->buffered_bytes;
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/* Copy state in from the context. */
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std::memcpy(m_internal_state, context->internal_state, sizeof(m_internal_state));
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/* Reset other fields. */
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m_state = State_Initialized;
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}
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template<size_t HashSize>
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void Sha3Impl<HashSize>::GetContext(Sha3Context *context) const {
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/* Check our state. */
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AMS_ASSERT(m_state == State_Initialized);
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/* Set the output hash size. */
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context->hash_size = HashSize;
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/* Set buffered bytes. */
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context->buffered_bytes = m_buffered_bytes;
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/* Copy out the context. */
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std::memcpy(context->internal_state, m_internal_state, sizeof(context->internal_state));
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}
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template<size_t HashSize>
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void Sha3Impl<HashSize>::ProcessBlock() {
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/* Ensure correct endianness. */
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if constexpr (util::IsBigEndian()) {
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for (size_t i = 0; i < util::size(m_internal_state); ++i) {
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m_internal_state[i] = util::LoadLittleEndian<u64>(m_internal_state + i);
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}
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}
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/* Perform all rounds. */
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uint64_t tmp, C[5];
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for (auto round = 0; round < NumRounds; ++round) {
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/* Handle theta. */
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for (size_t i = 0; i < 5; ++i) {
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C[i] = m_internal_state[i] ^ m_internal_state[i + 5] ^ m_internal_state[i + 10] ^ m_internal_state[i + 15] ^ m_internal_state[i + 20];
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}
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for (size_t i = 0; i < 5; ++i) {
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tmp = C[(i + 4) % 5] ^ util::RotateLeft<u64>(C[(i + 1) % 5], 1);
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for (size_t j = 0; j < 5; ++j) {
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m_internal_state[5 * j + i] ^= tmp;
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}
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}
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/* Handle rho/pi. */
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tmp = m_internal_state[1];
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for (size_t i = 0; i < NumRounds; ++i) {
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const auto rho_next_idx = RhoNextIndex[i];
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C[0] = m_internal_state[rho_next_idx];
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m_internal_state[rho_next_idx] = util::RotateLeft<u64>(tmp, RhoShiftBit[i]);
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tmp = C[0];
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}
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/* Handle chi. */
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for (size_t i = 0; i < 5; ++i) {
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for (size_t j = 0; j < 5; ++j) {
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C[j] = m_internal_state[5 * i + j];
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}
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for (size_t j = 0; j < 5; ++j) {
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m_internal_state[5 * i + j] ^= (~C[(j + 1) % 5]) & C[(j + 2) % 5];
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}
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}
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/* Handle iota. */
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m_internal_state[0] ^= IotaRoundConstant[round];
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}
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/* Ensure correct endianness. */
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if constexpr (util::IsBigEndian()) {
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for (size_t i = 0; i < util::size(m_internal_state); ++i) {
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util::StoreLittleEndian<u64>(m_internal_state + i, m_internal_state[i]);
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}
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}
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}
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template<size_t HashSize>
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void Sha3Impl<HashSize>::ProcessLastBlock() {
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/* Mix final bits (011) into our state. */
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reinterpret_cast<u8 *>(m_internal_state)[m_buffered_bytes] ^= 0b110;
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/* Mix in the high bit of the last word in our block. */
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constexpr u64 FinalMask = UINT64_C(0x8000000000000000);
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m_internal_state[(BlockSize / sizeof(u64)) - 1] ^= FinalMask;
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/* Process the last block. */
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this->ProcessBlock();
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}
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/* Explicitly instantiate the supported hash sizes. */
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template class Sha3Impl<224 / BITSIZEOF(u8)>;
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template class Sha3Impl<256 / BITSIZEOF(u8)>;
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template class Sha3Impl<384 / BITSIZEOF(u8)>;
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template class Sha3Impl<512 / BITSIZEOF(u8)>;
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}
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