mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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226 lines
7.3 KiB
C++
226 lines
7.3 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 const u32 RoundConstants[4] = {
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0x5A827999, 0x6ED9EBA1, 0x8F1BBCDC, 0xCA62C1D6
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};
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constexpr ALWAYS_INLINE u32 Choose(u32 x, u32 y, u32 z) {
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return (x & y) ^ ((~x) & z);
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}
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constexpr ALWAYS_INLINE u32 Majority(u32 x, u32 y, u32 z) {
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return (x & y) ^ (x & z) ^ (y & z);
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}
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constexpr ALWAYS_INLINE u32 Parity(u32 x, u32 y, u32 z) {
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return x ^ y ^ z;
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}
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}
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void Sha1Impl::Initialize() {
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/* Reset buffered bytes/bits. */
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m_buffered_bytes = 0;
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m_bits_consumed = 0;
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/* Set intermediate hash. */
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m_intermediate_hash[0] = 0x67452301;
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m_intermediate_hash[1] = 0xEFCDAB89;
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m_intermediate_hash[2] = 0x98BADCFE;
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m_intermediate_hash[3] = 0x10325476;
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m_intermediate_hash[4] = 0xC3D2E1F0;
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/* Set state. */
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m_state = State_Initialized;
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}
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void Sha1Impl::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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/* Advance our input bit count. */
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m_bits_consumed += BITSIZEOF(u8) * (((m_buffered_bytes + size) / BlockSize) * BlockSize);
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/* Process anything we have 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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const size_t copy_size = std::min(BlockSize - m_buffered_bytes, remaining);
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std::memcpy(m_buffer + m_buffered_bytes, data8, copy_size);
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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(m_buffer);
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m_buffered_bytes = 0;
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}
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}
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/* Process blocks, while we have any. */
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while (remaining >= BlockSize) {
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this->ProcessBlock(data8);
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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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m_buffered_bytes = remaining;
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std::memcpy(m_buffer, data8, remaining);
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}
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}
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void Sha1Impl::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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if constexpr (util::IsLittleEndian()) {
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static_assert(HashSize % sizeof(u32) == 0);
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u32 *dst_32 = static_cast<u32 *>(dst);
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for (size_t i = 0; i < HashSize / sizeof(u32); ++i) {
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dst_32[i] = util::LoadBigEndian<u32>(m_intermediate_hash + i);
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}
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} else {
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std::memcpy(dst, m_intermediate_hash, HashSize);
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}
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}
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void Sha1Impl::ProcessBlock(const void *data) {
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/* Load work variables. */
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u32 a = m_intermediate_hash[0];
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u32 b = m_intermediate_hash[1];
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u32 c = m_intermediate_hash[2];
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u32 d = m_intermediate_hash[3];
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u32 e = m_intermediate_hash[4];
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u32 tmp;
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size_t i;
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/* Copy the input. */
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u32 w[80];
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if constexpr (util::IsLittleEndian()) {
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static_assert(BlockSize % sizeof(u32) == 0);
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const u32 *src_32 = static_cast<const u32 *>(data);
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for (size_t i = 0; i < BlockSize / sizeof(u32); ++i) {
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w[i] = util::LoadBigEndian<u32>(src_32 + i);
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}
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} else {
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std::memcpy(w, data, BlockSize);
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}
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/* Initialize the rest of w. */
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for (i = BlockSize / sizeof(u32); i < util::size(w); ++i) {
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const u32 *prev = w + (i - BlockSize / sizeof(u32));
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w[i] = util::RotateLeft<u32>(prev[0] ^ prev[2] ^ prev[8] ^ prev[13], 1);
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}
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/* Perform rounds. */
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for (i = 0; i < 20; ++i) {
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tmp = util::RotateLeft<u32>(a, 5) + Choose(b, c, d) + e + w[i] + RoundConstants[0];
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e = d;
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d = c;
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c = util::RotateLeft<u32>(b, 30);
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b = a;
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a = tmp;
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}
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for (/* ... */; i < 40; ++i) {
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tmp = util::RotateLeft<u32>(a, 5) + Parity(b, c, d) + e + w[i] + RoundConstants[1];
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e = d;
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d = c;
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c = util::RotateLeft<u32>(b, 30);
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b = a;
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a = tmp;
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}
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for (/* ... */; i < 60; ++i) {
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tmp = util::RotateLeft<u32>(a, 5) + Majority(b, c, d) + e + w[i] + RoundConstants[2];
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e = d;
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d = c;
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c = util::RotateLeft<u32>(b, 30);
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b = a;
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a = tmp;
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}
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for (/* ... */; i < 80; ++i) {
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tmp = util::RotateLeft<u32>(a, 5) + Parity(b, c, d) + e + w[i] + RoundConstants[3];
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e = d;
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d = c;
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c = util::RotateLeft<u32>(b, 30);
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b = a;
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a = tmp;
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}
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/* Update intermediate hash. */
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m_intermediate_hash[0] += a;
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m_intermediate_hash[1] += b;
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m_intermediate_hash[2] += c;
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m_intermediate_hash[3] += d;
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m_intermediate_hash[4] += e;
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}
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void Sha1Impl::ProcessLastBlock() {
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/* Setup the final block. */
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constexpr const auto BlockSizeWithoutSizeField = BlockSize - sizeof(u64);
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/* Increment our bits consumed. */
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m_bits_consumed += BITSIZEOF(u8) * m_buffered_bytes;
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/* Add 0x80 terminator. */
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m_buffer[m_buffered_bytes++] = 0x80;
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/* If we can process the size field directly, do so, otherwise set up to process it. */
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if (m_buffered_bytes <= BlockSizeWithoutSizeField) {
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/* Clear up to size field. */
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std::memset(m_buffer + m_buffered_bytes, 0, BlockSizeWithoutSizeField - m_buffered_bytes);
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} else {
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/* Consume full block */
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std::memset(m_buffer + m_buffered_bytes, 0, BlockSize - m_buffered_bytes);
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this->ProcessBlock(m_buffer);
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/* Clear up to size field. */
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std::memset(m_buffer, 0, BlockSizeWithoutSizeField);
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}
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/* Store the size field. */
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util::StoreBigEndian<u64>(reinterpret_cast<u64 *>(m_buffer + BlockSizeWithoutSizeField), m_bits_consumed);
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/* Process the final block. */
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this->ProcessBlock(m_buffer);
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}
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}
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