org.cryptacular.generator.sp80038a

Class RBGNonce

java.lang.Object

org.cryptacular.generator.sp80038a.RBGNonce

All Implemented Interfaces:

Nonce

public class RBGNonce
extends Object
implements Nonce

Nonce generation strategy that produces a random value according to NIST SP-800-38a, appendix C, method 2 (random number generator), suitable for use with any block cipher mode described in that standard except OFB.

Instances of this class are thread safe.

Author:

Middleware Services

Constructor Summary

Constructors

Constructor and Description
RBGNonce() Creates a new instance that produces 16-bytes (128-bits) of random data.
RBGNonce(int length) Creates a new instance that produces length bytes of random data.

Method Summary

Modifier and Type	Method and Description
byte[]	generate() Generates a nonce value.
int	getLength()

Methods inherited from class java.lang.Object

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

Constructor Detail

RBGNonce

public RBGNonce()

Creates a new instance that produces 16-bytes (128-bits) of random data.

RBGNonce

public RBGNonce(int length)

Creates a new instance that produces length bytes of random data.

Parameters:

length - Number of bytes in generated nonce values.

Method Detail

generate

public byte[] generate()
                throws LimitException

Generates a nonce value.

Specified by:

generate in interface Nonce

Returns:

Nonce bytes.

Throws:

LimitException - When a limit imposed by the nonce generation strategy, if any, is exceeded.

getLength

public int getLength()

Specified by:

getLength in interface Nonce

Returns:

Length in bytes of generated nonce values.