BigIntegerCounterNonce

java.lang.Object

org.cryptacular.generator.sp80038a.BigIntegerCounterNonce

All Implemented Interfaces:: Nonce

public class BigIntegerCounterNonce extends Object implements Nonce

Uses a BigInteger to back a counter in order to produce nonces of arbitrary length.

A common use case for this component is creation of IVs for ciphers with 16-byte block size, e.g. AES.

Instances of this class are thread safe.

Field Summary

Fields

Modifier and Type

Field

Description

private BigInteger

counter

Counter.

private final int

length

Length of generated counter nonce values in bytes.
Constructor Summary

Constructors

Constructor

Description

BigIntegerCounterNonce(BigInteger counter, int length)

Creates a new instance with given parameters.
Method Summary

Modifier and Type

Method

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 Details
- counter
  
  private BigInteger counter
  
  Counter.
- length
  
  private final int length
  
  Length of generated counter nonce values in bytes.
Constructor Details
- BigIntegerCounterNonce
  
  public BigIntegerCounterNonce(BigInteger counter, int length)
  
  Creates a new instance with given parameters.
  
  Parameters:
  
  counter - Initial counter value.
  
  length - Maximum length of generated counter values in bytes.
Method Details
- 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.