SymmetricCipher.h

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#ifndef SYMMETRICCIPHER_H_
#define SYMMETRICCIPHER_H_

#include <string>

#include <openssl/evp.h>

#include "SymmetricKey.h"
#include <libcryptosec/exception/SymmetricCipherException.h>
#include <libcryptosec/exception/InvalidStateException.h>

class SymmetricCipher
{
    
public:

    enum OperationMode
    {
        NO_MODE, 
        CBC, 
        ECB, 
        CFB, 
        OFB, 
    };
    
    enum Operation
    {
        ENCRYPT, 
        DECRYPT, 
    };
    
    SymmetricCipher();
    
    SymmetricCipher(SymmetricKey &key, SymmetricCipher::Operation operation)
            throw (SymmetricCipherException);
    
    SymmetricCipher(SymmetricKey &key, SymmetricCipher::OperationMode mode, SymmetricCipher::Operation operation)
            throw (SymmetricCipherException);
    
    virtual ~SymmetricCipher();
    
    void init(SymmetricKey &key, SymmetricCipher::Operation operation)
            throw (SymmetricCipherException);
    
    void init(SymmetricKey &key, SymmetricCipher::OperationMode mode, SymmetricCipher::Operation operation)
            throw (SymmetricCipherException);
    
    void update(std::string &data) throw (InvalidStateException, SymmetricCipherException);

    void update(ByteArray &data) throw (InvalidStateException, SymmetricCipherException);
    
    ByteArray doFinal() throw (InvalidStateException, SymmetricCipherException);
    
    ByteArray doFinal(std::string &data) throw (InvalidStateException, SymmetricCipherException);
    
    ByteArray doFinal(ByteArray &data) throw (InvalidStateException, SymmetricCipherException);
    
    SymmetricCipher::OperationMode getOperationMode() throw (InvalidStateException);
    
    SymmetricCipher::Operation getOperation() throw (InvalidStateException);
    
    
    static std::string getOperationModeName(SymmetricCipher::OperationMode mode);
    
    static const EVP_CIPHER* getCipher(SymmetricKey::Algorithm algorithm, SymmetricCipher::OperationMode mode)
            throw (SymmetricCipherException);
    
    static void loadSymmetricCiphersAlgorithms();

private:

    enum State
    {
        NO_INIT, 
        INIT, 
        UPDATE 
    };
    
    
    SymmetricCipher::State state;

    SymmetricCipher::OperationMode mode;

    EVP_CIPHER_CTX ctx;

    ByteArray *buffer;
    
    std::pair<ByteArray*, ByteArray*> keyToKeyIv(ByteArray &key, const EVP_CIPHER *cipher);

};

#endif /*SYMMETRICCIPHER_H_*/