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author | Zach Hilman <zachhilman@gmail.com> | 2018-08-19 03:14:57 +0200 |
---|---|---|
committer | Zach Hilman <zachhilman@gmail.com> | 2018-08-23 17:53:30 +0200 |
commit | 42dc856ce136c75f587649863ec5bd936ba8b07a (patch) | |
tree | 5b270705a38cc4187a5634f753c9caa2f398dfb8 /src/core/crypto/xts_encryption_layer.cpp | |
parent | key_manager: Add support for autogenerated keys (diff) | |
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Diffstat (limited to 'src/core/crypto/xts_encryption_layer.cpp')
-rw-r--r-- | src/core/crypto/xts_encryption_layer.cpp | 33 |
1 files changed, 18 insertions, 15 deletions
diff --git a/src/core/crypto/xts_encryption_layer.cpp b/src/core/crypto/xts_encryption_layer.cpp index 431099580..c6e5df1ce 100644 --- a/src/core/crypto/xts_encryption_layer.cpp +++ b/src/core/crypto/xts_encryption_layer.cpp @@ -8,6 +8,8 @@ namespace Core::Crypto { +constexpr u64 XTS_SECTOR_SIZE = 0x4000; + XTSEncryptionLayer::XTSEncryptionLayer(FileSys::VirtualFile base_, Key256 key_) : EncryptionLayer(std::move(base_)), cipher(key_, Mode::XTS) {} @@ -17,34 +19,35 @@ size_t XTSEncryptionLayer::Read(u8* data, size_t length, size_t offset) const { const auto sector_offset = offset & 0x3FFF; if (sector_offset == 0) { - if (length % 0x4000 == 0) { + if (length % XTS_SECTOR_SIZE == 0) { std::vector<u8> raw = base->ReadBytes(length, offset); - cipher.XTSTranscode(raw.data(), raw.size(), data, offset / 0x4000, 0x4000, Op::Decrypt); + cipher.XTSTranscode(raw.data(), raw.size(), data, offset / XTS_SECTOR_SIZE, + XTS_SECTOR_SIZE, Op::Decrypt); return raw.size(); } - if (length > 0x4000) { - const auto rem = length % 0x4000; + if (length > XTS_SECTOR_SIZE) { + const auto rem = length % XTS_SECTOR_SIZE; const auto read = length - rem; return Read(data, read, offset) + Read(data + read, rem, offset + read); } - std::vector<u8> buffer = base->ReadBytes(0x4000, offset); - if (buffer.size() < 0x4000) - buffer.resize(0x4000); - cipher.XTSTranscode(buffer.data(), buffer.size(), buffer.data(), offset / 0x4000, 0x4000, - Op::Decrypt); + std::vector<u8> buffer = base->ReadBytes(XTS_SECTOR_SIZE, offset); + if (buffer.size() < XTS_SECTOR_SIZE) + buffer.resize(XTS_SECTOR_SIZE); + cipher.XTSTranscode(buffer.data(), buffer.size(), buffer.data(), offset / XTS_SECTOR_SIZE, + XTS_SECTOR_SIZE, Op::Decrypt); std::memcpy(data, buffer.data(), std::min(buffer.size(), length)); return std::min(buffer.size(), length); } // offset does not fall on block boundary (0x4000) std::vector<u8> block = base->ReadBytes(0x4000, offset - sector_offset); - if (block.size() < 0x4000) - block.resize(0x4000); - cipher.XTSTranscode(block.data(), block.size(), block.data(), (offset - sector_offset) / 0x4000, - 0x4000, Op::Decrypt); - const size_t read = 0x4000 - sector_offset; + if (block.size() < XTS_SECTOR_SIZE) + block.resize(XTS_SECTOR_SIZE); + cipher.XTSTranscode(block.data(), block.size(), block.data(), + (offset - sector_offset) / XTS_SECTOR_SIZE, XTS_SECTOR_SIZE, Op::Decrypt); + const size_t read = XTS_SECTOR_SIZE - sector_offset; - if (length + sector_offset < 0x4000) { + if (length + sector_offset < XTS_SECTOR_SIZE) { std::memcpy(data, block.data() + sector_offset, std::min<u64>(length, read)); return std::min<u64>(length, read); } |