io.vertx.ext.auth

Class PRNG

java.lang.Object

io.vertx.ext.auth.PRNG

All Implemented Interfaces:

VertxContextPRNG

public class PRNG
extends Object
implements VertxContextPRNG

Wrapper around secure random that periodically seeds the PRNG with new entropy. To avoid entropy exhaustion the entropy is only refreshed if the PRNG is used. This introduces a new variable which reduces the probability of cracking the random number generator.

Author:

Paulo Lopes

Constructor Summary

Constructors

Constructor and Description
PRNG(Vertx vertx)

Method Summary

Modifier and Type	Method and Description
void	close()
void	nextBytes(byte[] bytes) Fills the given byte array with random bytes.
int	nextInt() Returns a secure random int
int	nextInt(int bound) Returns a secure random int, between 0 (inclusive) and the specified bound (exclusive).

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.vertx.ext.auth.VertxContextPRNG

current, current, current, nextString

Constructor Detail

PRNG

public PRNG(Vertx vertx)

Method Detail

close

public void close()

nextBytes

public void nextBytes(byte[] bytes)

Description copied from interface: VertxContextPRNG

Fills the given byte array with random bytes.

Specified by:

nextBytes in interface VertxContextPRNG

Parameters:

bytes - a byte array.

nextInt

public int nextInt()

Description copied from interface: VertxContextPRNG

Returns a secure random int

Specified by:

nextInt in interface VertxContextPRNG

Returns:

random int.

nextInt

public int nextInt(int bound)

Description copied from interface: VertxContextPRNG

Returns a secure random int, between 0 (inclusive) and the specified bound (exclusive).

Specified by:

nextInt in interface VertxContextPRNG

Parameters:

bound - the upper bound (exclusive), which must be positive.

Returns:

random int.