iaik.me.security
Class SecureRandom

java.lang.Object
  |
  +--iaik.me.security.SecureRandom

public class SecureRandom

extends Object

A class to generate secure random bytes. It makes use of the SHA message digest to generate secure pseudo random bytes from an initial true random seed. This true random seed must be provided by the user, either by setting it via addSeed() for a particular SecureRandom instance or by specifying a system default seed via SecureRandom.getSeedGenerator().addSeed(). If a seed has not been set, a warning message is displayed on the system console.

Constructor Summary

SecureRandom()
Generate a new random number generator.

Method Summary

void	addSeed(byte[] newSeed) Add new entropy to the seed.
static SecureRandom	getDefault() Get a new random number generator of the system default type.
static SecureRandom	getSeedGenerator() Get the system default seed generator.
byte[]	nextBytes(byte[] bytes) Return bytes.length random bytes.
int	nextInt() Return a 32 bit random value as an integer.
void	setSeed(byte[] newSeed) Set the seed to the specified value.
static void	setSeedGenerator(SecureRandom random) Set the system default seed generator.

Methods inherited from class java.lang.Object

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

Constructor Detail

SecureRandom

public SecureRandom()

Generate a new random number generator. The static method SecureRandom.getDefault() should be preferably used instead of this constructor.

Method Detail

getDefault

public static SecureRandom getDefault()

Get a new random number generator of the system default type.

getSeedGenerator

public static SecureRandom getSeedGenerator()

Get the system default seed generator.

setSeedGenerator

public static void setSeedGenerator(SecureRandom random)

Set the system default seed generator.

setSeed

public void setSeed(byte[] newSeed)

Set the seed to the specified value. Previous seeding information is lost, in most cases the method addSeed() is to be preferred.

addSeed

public void addSeed(byte[] newSeed)

Add new entropy to the seed. The data is automatically added to the seed generator as well.

nextBytes

public byte[] nextBytes(byte[] bytes)

Return bytes.length random bytes.

nextInt

public int nextInt()

Return a 32 bit random value as an integer.