org.cryptacular.generator.sp80038a

Class EncryptedNonce

java.lang.Object

org.cryptacular.generator.sp80038a.EncryptedNonce

All Implemented Interfaces:

Nonce

public class EncryptedNonce
extends java.lang.Object
implements Nonce

Nonce generation strategy that produces a random value according to NIST SP-800-38a, appendix C, method 1 (encrypted nonce), 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 org.bouncycastle.crypto.BlockCipher	cipher Block cipher.
private javax.crypto.SecretKey	key Encryption key.

Constructor Summary

Constructors

Constructor and Description
EncryptedNonce(org.bouncycastle.crypto.BlockCipher cipher, javax.crypto.SecretKey key) Creates a new instance.
EncryptedNonce(Spec<org.bouncycastle.crypto.BlockCipher> cipherSpec, javax.crypto.SecretKey key) Creates a new instance.

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

cipher

private final org.bouncycastle.crypto.BlockCipher cipher

Block cipher.

key

private final javax.crypto.SecretKey key

Encryption key.

Constructor Detail

EncryptedNonce

public EncryptedNonce(Spec<org.bouncycastle.crypto.BlockCipher> cipherSpec,
                      javax.crypto.SecretKey key)

Creates a new instance.

Parameters:

cipherSpec - Block cipher specification.

key - Symmetric key.

EncryptedNonce

public EncryptedNonce(org.bouncycastle.crypto.BlockCipher cipher,
                      javax.crypto.SecretKey key)

Creates a new instance.

Parameters:

cipher - Block cipher to use.

key - Symmetric key.

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.