com.rsa.authagent.authapi.ciphers
Class DesCipher

java.lang.Object
  com.rsa.authagent.authapi.ciphers.DesCipher

All Implemented Interfaces:

SimpleCipher

public class DesCipher
extends java.lang.Object
implements SimpleCipher

A simple implementation of the DES cipher for data encryption and decryption. This DES has a custom flavor to the standard DES behaviors: the encryption of the last undersize block is unique and proprietary to RSA.

Usage:

 
  
   
    
     
      SimpleCipher des =                       // Creates a new cipher object.
           SimpleCipherFactory.getCipher(SimpleCipherFactory.DES_CIPHER);
      des.setKey(key);                         // Sets the key for encryption.
      cipherText = des.encrypt(plainText);     // Performs encryption.
      des.clear();                             // Clears the data when the cipher is no longer in use.
      ...
      des =                                    // Creates another cipher object.
           SimpleCipherFactory.getCipher(SimpleCipherFactory.DES_CIPHER);
      des.setKey(key);                         // Sets the key for decryption.
      decipherText = des.decrypt(cipherData);  // Performs decryption.
      des.clear();                             // Clears the data when the cipher is no longer in use.
      
     
    
   
  
 

Constructor Summary

DesCipher()
Constructor for DesCipher.

Method Summary

void	clear() Clears all sensitive data in the object.
byte[]	decrypt(byte[] data) Performs decryption on the data with the initialized key.
byte[]	decrypt(byte[] data, int offset, int length) Performs decryption on the data with the initialized key.
byte[]	encrypt(byte[] data) Performs encryption on the data with the initialized key.
byte[]	encrypt(byte[] data, int offset, int length) Performs encryption on the data with the initialized key.
void	setKey(byte[] key) Initializes the cipher with the specified key.
void	setKey(byte[] key, int offset, int length) Initializes the cipher with the specified key.

Methods inherited from class java.lang.Object

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

Constructor Detail

DesCipher

public DesCipher()

Constructor for DesCipher.

Method Detail

setKey

public void setKey(byte[] key)

Description copied from interface: SimpleCipher

Initializes the cipher with the specified key.

Specified by:

setKey in interface SimpleCipher

Parameters:

key - the key for subsequent cryptographic operations.

See Also:

SimpleCipher.setKey(byte[])

setKey

public void setKey(byte[] key,
                   int offset,
                   int length)

Description copied from interface: SimpleCipher

Initializes the cipher with the specified key.

Specified by:

setKey in interface SimpleCipher

Parameters:

key - the key for subsequent cryptographic operations.

offset - index to the first byte of the key.

length - length of the key.

See Also:

SimpleCipher.setKey(byte[], int, int)

encrypt

public byte[] encrypt(byte[] data)

Description copied from interface: SimpleCipher

Performs encryption on the data with the initialized key.

Specified by:

encrypt in interface SimpleCipher

Parameters:

data - the data to encrypt.

Returns:

output in a byte array.

See Also:

SimpleCipher.encrypt(byte[])

encrypt

public byte[] encrypt(byte[] data,
                      int offset,
                      int length)

Description copied from interface: SimpleCipher

Performs encryption on the data with the initialized key.

Specified by:

encrypt in interface SimpleCipher

Parameters:

data - the data to encrypt.

offset - index to the first byte of data to encrypt.

length - length of the data to encrypt.

Returns:

output in a byte array.

See Also:

SimpleCipher.encrypt(byte[], int, int)

decrypt

public byte[] decrypt(byte[] data)

Description copied from interface: SimpleCipher

Performs decryption on the data with the initialized key.

Specified by:

decrypt in interface SimpleCipher

Parameters:

data - the data to decrypt.

Returns:

output in a byte array.

See Also:

SimpleCipher.decrypt(byte[])

decrypt

public byte[] decrypt(byte[] data,
                      int offset,
                      int length)

Description copied from interface: SimpleCipher

Performs decryption on the data with the initialized key.

Specified by:

decrypt in interface SimpleCipher

Parameters:

data - the data to decrypt.

offset - index to the first byte of data to decrypt.

length - length of the data to decrypt.

Returns:

output in a byte array.

See Also:

SimpleCipher.decrypt(byte[], int, int)

clear

public void clear()

Description copied from interface: SimpleCipher

Clears all sensitive data in the object.

Specified by:

clear in interface SimpleCipher

See Also:

SimpleCipher.clear()