52 lines
1012 B
C++
52 lines
1012 B
C++
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// AesCfb128Decryptor.h
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// Declares the cAesCfb128Decryptor class decrypting data using AES CFB-128
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#pragma once
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#include "polarssl/aes.h"
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/** Decrypts data using the AES / CFB 128 algorithm */
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class cAesCfb128Decryptor
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{
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public:
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cAesCfb128Decryptor(void);
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~cAesCfb128Decryptor();
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/** Initializes the decryptor with the specified Key / IV */
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void Init(const Byte a_Key[16], const Byte a_IV[16]);
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/** Decrypts a_Length bytes of the encrypted data; produces a_Length output bytes */
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void ProcessData(Byte * a_DecryptedOut, const Byte * a_EncryptedIn, size_t a_Length);
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/** Returns true if the object has been initialized with the Key / IV */
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bool IsValid(void) const { return m_IsValid; }
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protected:
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aes_context m_Aes;
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/** The InitialVector, used by the CFB mode decryption */
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Byte m_IV[16];
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/** Current offset in the m_IV, used by the CFB mode decryption */
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size_t m_IVOffset;
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/** Indicates whether the object has been initialized with the Key / IV */
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bool m_IsValid;
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} ;
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