de.flexiprovider.core.rc5
Class RC5ParameterSpec

java.lang.Object
  |
  +--de.flexiprovider.core.rc5.RC5ParameterSpec

All Implemented Interfaces:

AlgorithmParameterSpec, java.security.spec.AlgorithmParameterSpec

public class RC5ParameterSpec

extends java.lang.Object

implements AlgorithmParameterSpec

This class specifies the parameters for the RC5 Algorithm. The parameters consist of the version number, the number of rounds, the word size, and an optional initialization vector (IV). The block size of RC5 is twice the word size. Values for the number of rounds are 8 to 127, with the default being 12. Values for the word size are 16, 32, and 64 bits, with the default being 32 bits.

Author:

Oliver Seiler, Martin Döring

Field Summary

static int	DEFAULT_NUM_ROUNDS The default number of rounds (12)
static int	DEFAULT_WORD_SIZE The default word size (32 bits)
static int	RC5_v1_0 Constant defining the first version of RC5

Constructor Summary

RC5ParameterSpec()
Construct the default RC5 parameters without an IV.

RC5ParameterSpec(int numRounds, int wordSize)
Construct a parameter set for RC5 from the given number of rounds and word size.

RC5ParameterSpec(int numRounds, int wordSize, ModeParameterSpec modeParams)
Construct a parameter set for RC5 from the given number of rounds, word size, and initialization vector (IV).

RC5ParameterSpec(ModeParameterSpec modeParams)
Construct the default RC5 parameters with the given IV.

Method Summary

boolean	equals(java.lang.Object other) Compare these parameters with another object.
byte[]	getIV()
int	getNumRounds()
int	getVersion()
int	getWordSize()
int	hashCode()

Methods inherited from class java.lang.Object

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

Field Detail

RC5_v1_0

public static final int RC5_v1_0

Constant defining the first version of RC5

DEFAULT_NUM_ROUNDS

public static final int DEFAULT_NUM_ROUNDS

The default number of rounds (12)

DEFAULT_WORD_SIZE

public static final int DEFAULT_WORD_SIZE

The default word size (32 bits)

Constructor Detail

RC5ParameterSpec

public RC5ParameterSpec()

Construct the default RC5 parameters without an IV. The default parameters are:

• version: RC5_v1_0
• number of rounds: DEFAULT_NUM_ROUNDS
• word size: DEFAULT_WORD_SIZE

RC5ParameterSpec

public RC5ParameterSpec(ModeParameterSpec modeParams)

Construct the default RC5 parameters with the given IV. The default parameters are:

• version: RC5_v1_0
• number of rounds: DEFAULT_NUM_ROUNDS
• word size: DEFAULT_WORD_SIZE

Parameters:

modeParams - the mode parameters containing the IV

RC5ParameterSpec

public RC5ParameterSpec(int numRounds,
                        int wordSize)

Construct a parameter set for RC5 from the given number of rounds and word size. Choose version as RC5_v1_0. If the number of rounds is invalid, choose DEFAULT_NUM_ROUNDS. If the word size is invalid, choose the DEFAULT_WORD_SIZE. The block size of RC5 is twice the word size.

Parameters:

numRounds - the number of rounds (8...127)

wordSize - the word size (16, 32, or 64 bits)

RC5ParameterSpec

public RC5ParameterSpec(int numRounds,
                        int wordSize,
                        ModeParameterSpec modeParams)

Construct a parameter set for RC5 from the given number of rounds, word size, and initialization vector (IV). Choose version as RC5_v1_0. If the number of rounds is invalid, choose DEFAULT_NUM_ROUNDS. If the word size is invalid, choose the DEFAULT_WORD_SIZE. The block size of RC5 is twice the word size.

Parameters:

numRounds - the number of rounds (8...127)

wordSize - the word size (16, 32, or 64 bits)

modeParams - the mode parameters containing the IV

Method Detail

getVersion

public int getVersion()

Returns:

the version number

getNumRounds

public int getNumRounds()

Returns:

the number of rounds

getWordSize

public int getWordSize()

Returns:

the word size in bits

getIV

public byte[] getIV()

Returns:

a copy of the initialization vector (IV) (maybe null)

equals

public boolean equals(java.lang.Object other)

Compare these parameters with another object.

Overrides:

equals in class java.lang.Object

Parameters:

other - the other object

Returns:

the result of the comparison

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

Returns:

the hash code of these parameters