edu.vt.middleware.crypt.symmetric
Class RC5

java.lang.Object
  edu.vt.middleware.crypt.AbstractAlgorithm
      edu.vt.middleware.crypt.AbstractEncryptionAlgorithm
          edu.vt.middleware.crypt.symmetric.SymmetricAlgorithm
              edu.vt.middleware.crypt.symmetric.RC5

All Implemented Interfaces:

Algorithm, EncryptionAlgorithm

public class RC5
extends SymmetricAlgorithm

Provider of symmetric encryption/decryption operations using RC5 cipher.

Version:

$Revision: 2744 $

Author:

Middleware Services

Field Summary

static String

ALGORITHM Algorithm name.

Fields inherited from class edu.vt.middleware.crypt.symmetric.SymmetricAlgorithm

DEFAULT_MODE, DEFAULT_PADDING, iv, paramSpec

Fields inherited from class edu.vt.middleware.crypt.AbstractEncryptionAlgorithm

cipher, cipherMode, key, mode, padding

Fields inherited from class edu.vt.middleware.crypt.AbstractAlgorithm

algorithm, logger, randomByteSize, randomProvider

Constructor Summary

RC5()
Creates a default RC5 symmetric encryption algorithm using CBC mode and PKCS5 padding.

RC5(String mode, String padding)
Creates a default RC5 symmetric encryption algorithm using the given mode and padding style.

Method Summary

int[]	getAllowedKeyLengths() Gets an array of key lengths that are acceptable for the cipher algorithm.
boolean	isValidKeyLength(int bitLength) Determines whether the given key size in bits is valid for this symmetric cipher algorithm.

Methods inherited from class edu.vt.middleware.crypt.symmetric.SymmetricAlgorithm

clone, getAlgorithmParameterSpec, getChunkSize, getMaxKeyLength, getMinKeyLength, getRandomIV, hasIV, newInstance, newInstance, newInstance, newInstance, setIV

Methods inherited from class edu.vt.middleware.crypt.AbstractEncryptionAlgorithm

crypt, crypt, decrypt, decrypt, decrypt, encrypt, encrypt, encrypt, getBlockSize, getCipherMode, getMode, getPadding, init, initCipher, initDecrypt, initEncrypt, setKey, toString

Methods inherited from class edu.vt.middleware.crypt.AbstractAlgorithm

getAlgorithm, getRandomData, setRandomProvider

Methods inherited from class java.lang.Object

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

Methods inherited from interface edu.vt.middleware.crypt.Algorithm

getAlgorithm, getRandomData, setRandomProvider

Field Detail

ALGORITHM

public static final String ALGORITHM

Algorithm name.

See Also:

Constant Field Values

Constructor Detail

RC5

public RC5()

Creates a default RC5 symmetric encryption algorithm using CBC mode and PKCS5 padding.

RC5

public RC5(String mode,
           String padding)

Creates a default RC5 symmetric encryption algorithm using the given mode and padding style.

Parameters:

mode - Cipher mode name.

padding - Cipher padding style name.

Method Detail

getAllowedKeyLengths

public int[] getAllowedKeyLengths()

Gets an array of key lengths that are acceptable for the cipher algorithm. By convention the lengths are returned in descending sort order from longest to shortest. There are some ciphers (e.g. Blowfish) that allow key sizes to be any integral value in a range; in those cases only key sizes that are multiple of the cipher block length are returned. Thus this method always returns lengths that are acceptable, but not necessarily all possible lengths.

Overrides:

getAllowedKeyLengths in class SymmetricAlgorithm

Returns:

Array of key lengths in bits.

isValidKeyLength

public boolean isValidKeyLength(int bitLength)

Determines whether the given key size in bits is valid for this symmetric cipher algorithm.

Overrides:

isValidKeyLength in class SymmetricAlgorithm

Parameters:

bitLength - Key size in bits.

Returns:

True if given value is a valid key size for this algorithm, false otherwise.