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  /*
   * Copyright 2012 Mirko Caserta
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this software 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.
  */
 package com.springcryptoutils.core.cipher.symmetric;
 
 
The default implementation for performing symmetric encryption/decryption.

Author(s):
Mirko Caserta (mirko.caserta@gmail.com)
 
 public class CiphererImpl implements Cipherer {
 
 	private String keyAlgorithm = "DESede";
 	private String cipherAlgorithm = "DESede/CBC/PKCS5Padding";
 	private String provider;
 	private Mode mode;

The symmetric key algorithm. The default is DESede (triple DES).

Parameters:
keyAlgorithm the symmetric key algorithm
 
 	public void setKeyAlgorithm(String keyAlgorithm) {
 		this. = keyAlgorithm;
 	}

The cipher algorithm. The default is DESede/CBC/PKCS5Padding (triple DES with Cipher Block Chaining and PKCS 5 padding).

Parameters:
cipherAlgorithm the cipher algorithm
 
 	public void setCipherAlgorithm(String cipherAlgorithm) {
 		this. = cipherAlgorithm;
 	}

Sets the provider name of the specific implementation requested (e.g., "BC" for BouncyCastle, "SunJCE" for the default Sun JCE provider).

Parameters:
provider the provider to set
 
 	public void setProvider(String provider) {
 		this. = provider;
 	}

Sets the encryption/decryption mode.

Parameters:
mode the encryption/decryption mode
 
 	public void setMode(Mode mode) {
 		this. = mode;
 	}

Encrypts/decrypts a message based on the underlying mode of operation.

Parameters:
key the encryption key
initializationVector the initialization vector
message if in encryption mode, the clear-text message, otherwise the message to decrypt
Returns:
if in encryption mode, the encrypted message, otherwise the decrypted message
Throws:
SymmetricEncryptionException on runtime errors
See also:
setMode(com.springcryptoutils.core.cipher.Mode)
 
 	public byte[] encrypt(byte[] keybyte[] initializationVectorbyte[] message) {
 		try {
 			IvParameterSpec initializationVectorSpec = new IvParameterSpec(initializationVector);
 			final SecretKeySpec skey = new SecretKeySpec(key);
 			final Cipher cipher = ((( == null) || (.length() == 0))
 			switch () {
 				case :
 					cipher.init(.skeyinitializationVectorSpec);
 					break;
 				case :
 					cipher.init(.skeyinitializationVectorSpec);
 					break;
				default:
					throw new SymmetricEncryptionException("error encrypting/decrypting message: invalid mode; mode=" + );
			}
			return cipher.doFinal(message);
catch (Exception e) {
			throw new SymmetricEncryptionException("error encrypting/decrypting message; mode=" + e);
		}
	}
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