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Update src/core/file_sys/fssystem/fssystem_aes_xts_storage.cpp

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godpow 2025-10-19 08:55:10 +02:00 • committed by crueter
parent deb08a4fdb
commit bfb4fc19d3
1 changed files with 4 additions and 1 deletions
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src/core/file_sys/fssystem/fssystem_aes_xts_storage.cpp
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@ -65,10 +65,13 @@ size_t AesXtsStorage::Read(u8* buffer, size_t size, size_t offset) const {
if ((offset % m_block_size) != 0) {
// Decrypt into our pooled stack buffer (max bound = NCA::XtsBlockSize)
boost::container::static_vector<u8, NcaHeader::XtsBlockSize> tmp_buf;
ASSERT(m_block_size <= tmp_buf.max_size());
tmp_buf.resize(m_block_size);
// Determine the size of the pre-data read.
auto const skip_size = size_t(offset - Common::AlignDown(offset, m_block_size));
auto const data_size = (std::min)(size, m_block_size - skip_size);
std::fill_n(tmp_buf.begin(), skip_size, u8{0});
if (skip_size > 0)
std::fill_n(tmp_buf.begin(), skip_size, u8{0});
std::memcpy(tmp_buf.data() + skip_size, buffer, data_size);
m_cipher->SetIV(ctr);
m_cipher->Transcode(tmp_buf.data(), m_block_size, tmp_buf.data(), Core::Crypto::Op::Decrypt);