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aes_util: Make Transcode() a const member function
This doesn't modify member state, so it can be made const.
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@ -58,29 +58,30 @@ void AESCipher<Key, KeySize>::SetIV(std::vector<u8> iv) {
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}
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template <typename Key, size_t KeySize>
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void AESCipher<Key, KeySize>::Transcode(const u8* src, size_t size, u8* dest, Op op) {
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size_t written = 0;
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const auto context = op == Op::Encrypt ? &ctx->encryption_context : &ctx->decryption_context;
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void AESCipher<Key, KeySize>::Transcode(const u8* src, size_t size, u8* dest, Op op) const {
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auto* const context = op == Op::Encrypt ? &ctx->encryption_context : &ctx->decryption_context;
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mbedtls_cipher_reset(context);
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size_t written = 0;
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if (mbedtls_cipher_get_cipher_mode(context) == MBEDTLS_MODE_XTS) {
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mbedtls_cipher_update(context, src, size, dest, &written);
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if (written != size)
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if (written != size) {
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LOG_WARNING(Crypto, "Not all data was decrypted requested={:016X}, actual={:016X}.",
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size, written);
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}
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} else {
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const auto block_size = mbedtls_cipher_get_block_size(context);
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for (size_t offset = 0; offset < size; offset += block_size) {
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auto length = std::min<size_t>(block_size, size - offset);
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mbedtls_cipher_update(context, src + offset, length, dest + offset, &written);
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if (written != length)
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if (written != length) {
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LOG_WARNING(Crypto, "Not all data was decrypted requested={:016X}, actual={:016X}.",
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length, written);
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}
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}
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}
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mbedtls_cipher_finish(context, nullptr, nullptr);
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}
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@ -38,11 +38,11 @@ public:
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void SetIV(std::vector<u8> iv);
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template <typename Source, typename Dest>
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void Transcode(const Source* src, size_t size, Dest* dest, Op op) {
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void Transcode(const Source* src, size_t size, Dest* dest, Op op) const {
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Transcode(reinterpret_cast<const u8*>(src), size, reinterpret_cast<u8*>(dest), op);
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}
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void Transcode(const u8* src, size_t size, u8* dest, Op op);
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void Transcode(const u8* src, size_t size, u8* dest, Op op) const;
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template <typename Source, typename Dest>
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void XTSTranscode(const Source* src, size_t size, Dest* dest, size_t sector_id,
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