org.cryptacular.generator.sp80038a

Class RBGNonce

java.lang.Object

org.cryptacular.generator.sp80038a.RBGNonce

All Implemented Interfaces:

Nonce

public class RBGNonce
extends java.lang.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.

Field Summary

Fields

Modifier and Type	Field and Description
private int	length Length of generated nonces.
private org.bouncycastle.crypto.prng.drbg.SP80090DRBG	rbg Random bit generator.

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

Field Detail

length

private final int length

Length of generated nonces.

rbg

private final org.bouncycastle.crypto.prng.drbg.SP80090DRBG rbg

Random bit generator.

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

Description copied from interface: Nonce

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.