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aes_util: Make XTSTranscode stricter about sizes

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XTS with Nintendo Tweak will fail mysteriously if the sector size is not 0x4000. Upgrade the critical log to an assert to prevent undefined behavior.
This commit is contained in:
Zach Hilman 2018-08-16 17:00:35 -04:00
parent 6dd369ab88
commit 10e5356e9a
1 changed files with 2 additions and 5 deletions
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7
src/core/crypto/aes_util.cpp
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@ -99,10 +99,7 @@ void AESCipher<Key, KeySize>::Transcode(const u8* src, size_t size, u8* dest, Op
template <typename Key, size_t KeySize> template <typename Key, size_t KeySize>
void AESCipher<Key, KeySize>::XTSTranscode(const u8* src, size_t size, u8* dest, size_t sector_id, void AESCipher<Key, KeySize>::XTSTranscode(const u8* src, size_t size, u8* dest, size_t sector_id,
size_t sector_size, Op op) { size_t sector_size, Op op) {
if (size % sector_size > 0) { ASSERT_MSG(size % sector_size == 0, "XTS decryption size must be a multiple of sector size.");
LOG_CRITICAL(Crypto, "Data size must be a multiple of sector size.");
return;
}
for (size_t i = 0; i < size; i += sector_size) { for (size_t i = 0; i < size; i += sector_size) {
SetIV(CalculateNintendoTweak(sector_id++)); SetIV(CalculateNintendoTweak(sector_id++));
@ -112,4 +109,4 @@ void AESCipher<Key, KeySize>::XTSTranscode(const u8* src, size_t size, u8* dest,
template class AESCipher<Key128>; template class AESCipher<Key128>;
template class AESCipher<Key256>; template class AESCipher<Key256>;
} // namespace Core::Crypto } // namespace Core::Crypto