
/*
 * Copyright 2011-2022 Cuberite Contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

// AesCfb128Decryptor.h

// Declares the cAesCfb128Decryptor class decrypting data using AES CFB-128





#pragma once

#if PLATFORM_CRYPTOGRAPHY && defined(_WIN32)
#include <wincrypt.h>
#else
#include "mbedtls/aes.h"
#endif





/** Decrypts data using the AES / CFB 128 algorithm */
class cAesCfb128Decryptor
{
public:

	cAesCfb128Decryptor(void);
	~cAesCfb128Decryptor();

	/** Initializes the decryptor with the specified Key / IV */
	void Init(const Byte a_Key[16], const Byte a_IV[16]);

	/** Decrypts a_Length bytes of the encrypted data in-place; produces a_Length output bytes */
	void ProcessData(std::byte * a_EncryptedIn, size_t a_Length);

	/** Returns true if the object has been initialized with the Key / IV */
	bool IsValid(void) const { return m_IsValid; }

protected:

#if PLATFORM_CRYPTOGRAPHY && defined(_WIN32)
	HCRYPTPROV m_Aes;
	HCRYPTKEY m_Key;
#else
	mbedtls_aes_context m_Aes;
#endif

	/** The InitialVector, used by the CFB mode decryption */
	Byte m_IV[16];

	/** Indicates whether the object has been initialized with the Key / IV */
	bool m_IsValid;
} ;
