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// AesCfb128Decryptor.h
// Declares the cAesCfb128Decryptor class decrypting data using AES CFB-128
#pragma once
#include "polarssl/aes.h"
/** 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; produces a_Length output bytes */
void ProcessData(Byte * a_DecryptedOut, const 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:
aes_context m_Aes;
/** The InitialVector, used by the CFB mode decryption */
Byte m_IV[16];
/** Current offset in the m_IV, used by the CFB mode decryption */
size_t m_IVOffset;
/** Indicates whether the object has been initialized with the Key / IV */
bool m_IsValid;
} ;
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