Package org.silverpeas.core.security.encryption.cipher

Class BlowfishCipher

java.lang.Object

org.silverpeas.core.security.encryption.cipher.BlowfishCipher

All Implemented Interfaces:

Cipher

public class BlowfishCipher
extends Object
implements Cipher

Blowfish is a keyed, symmetric block cipher, designed in 1993 by Bruce Schneier and included in a large number of cipher suites and encryption products. Blowfish provides a good encryption rate in software and no effective cryptanalysis of it has been found to date. However, the Advanced Encryption Standard now receives more attention.

Blowfish was one of the first secure block ciphers not subject to any patents and therefore freely available for anyone to use. This benefit has contributed to its popularity in cryptographic software.

This implementation wraps the Blowfish cipher provided in the Java Cryptography API and it performs the redundant operations in the encryption and in the decryption.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	BlowfishCipher()

Method Summary

Modifier and Type	Method	Description
String	decrypt(byte[] cipher, CipherKey keyCode)	Decrypt the specified code or cipher by using the specified cryptographic key.
byte[]	encrypt(String data, CipherKey keyCode)	Encrypts the specified data by using the specified cryptographic key.
CipherKey	generateCipherKey()	Generates randomly a cipher key that can be used in the encryption and in the decryption of data with this cipher.
CryptographicAlgorithmName	getAlgorithmName()	Gets the name of the algorithm of the cipher.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

BlowfishCipher

protected BlowfishCipher()
                  throws NoSuchPaddingException,
                         NoSuchAlgorithmException

Throws:

NoSuchPaddingException

NoSuchAlgorithmException

Method Detail

getAlgorithmName

public CryptographicAlgorithmName getAlgorithmName()

Gets the name of the algorithm of the cipher.

Specified by:

getAlgorithmName in interface Cipher

Returns:

the algorithm name.

encrypt

public byte[] encrypt(String data,
                      CipherKey keyCode)
               throws CryptoException

Description copied from interface: Cipher

Encrypts the specified data by using the specified cryptographic key.

The String objects handled by the encryption is done according the UTF-8 charset.

Specified by:

encrypt in interface Cipher

Parameters:

data - the data to encode.

keyCode - the key to use in the encryption.

Returns:

the encrypted data in bytes.

Throws:

CryptoException - if an error has occurred in the data encryption.

decrypt

public String decrypt(byte[] cipher,
                      CipherKey keyCode)
               throws CryptoException

Description copied from interface: Cipher

Decrypt the specified code or cipher by using the specified cryptographic key.

The String objects handled by the encryption is done according the UTF-8 charset.

Specified by:

decrypt in interface Cipher

Parameters:

cipher - the data in bytes encrypted by this cipher.

keyCode - the key to use in the decryption.

Returns:

the decrypted data.

Throws:

CryptoException - if an error has occurred in the data decryption.

generateCipherKey

public CipherKey generateCipherKey()
                            throws CryptoException

Description copied from interface: Cipher

Generates randomly a cipher key that can be used in the encryption and in the decryption of data with this cipher.

Specified by:

generateCipherKey in interface Cipher

Returns:

a computed key that can be used with this cipher in the encryption and in the decryption of data.

Throws:

CryptoException - if an error has occurred in the key generation.