text: /*
   * Copyright (c) 2010 SURFnet bv
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
   * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
   * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
   * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
   * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  /*****************************************************************************
   OSSLEVPSymmetricAlgorithm.h
  
   OpenSSL symmetric algorithm implementation
   *****************************************************************************/
  
  #ifndef _SOFTHSM_V2_OSSLEVPSYMMETRICALGORITHM_H
  #define _SOFTHSM_V2_OSSLEVPSYMMETRICALGORITHM_H
  
  #include <openssl/evp.h>
  #include <string>
  #include "config.h"
  #include "SymmetricKey.h"
  #include "SymmetricAlgorithm.h"
  
  class OSSLEVPSymmetricAlgorithm : public SymmetricAlgorithm
  {
  public:
  	// Constructor
  	OSSLEVPSymmetricAlgorithm();
  
  	// Destructor
  	virtual ~OSSLEVPSymmetricAlgorithm();
  
  	// Encryption functions
  	virtual bool encryptInit(const SymmetricKey* key, const SymMode::Type mode = SymMode::CBC, const ByteString& IV = ByteString(), bool padding = true, size_t counterBits = 0, const ByteString& aad = ByteString(), size_t tagBytes = 0);
  	virtual bool encryptUpdate(const ByteString& data, ByteString& encryptedData);
  	virtual bool encryptFinal(ByteString& encryptedData);
  
  	// Decryption functions
  	virtual bool decryptInit(const SymmetricKey* key, const SymMode::Type mode = SymMode::CBC, const ByteString& IV = ByteString(), bool padding = true, size_t counterBits = 0, const ByteString& aad = ByteString(), size_t tagBytes = 0);
  	virtual bool decryptUpdate(const ByteString& encryptedData, ByteString& data);
  	virtual bool decryptFinal(ByteString& data);
  
  	// Return the block size
  	virtual size_t getBlockSize() const = 0;
  
  	// Check if more bytes of data can be encrypted
  	virtual bool checkMaximumBytes(unsigned long bytes);
  
  protected:
  	// Return the right EVP cipher for the operation
  	virtual const EVP_CIPHER* getCipher() const = 0;
  
  private:
  	// The current EVP context
  	EVP_CIPHER_CTX* pCurCTX;
  
  	// The maximum bytes to encrypt/decrypt
  	BIGNUM* maximumBytes;
  	BIGNUM* counterBytes;
  };
  
  #endif // !_SOFTHSM_V2_OSSLEVPSYMMETRICALGORITHM_H
  
  