org.h2.util
Class RandomUtils

java.lang.Object
  org.h2.util.RandomUtils

public class RandomUtils
extends java.lang.Object

Utility class that supports random and secure random functions. In some systems SecureRandom initialization is very slow, a workaround is implemented here.

Method Summary

static byte[]	getSecureBytes(int len) Get a number of cryptographically secure pseudo random bytes.
static long	getSecureLong() Get a cryptographically secure pseudo random long value.
static int	nextInt(int lowerThan) Get a pseudo random int value between 0 (including and the given value (excluding).
static int	nextSecureInt(int lowerThan) Get a cryptographically secure pseudo random int value between 0 (including and the given value (excluding).

Methods inherited from class java.lang.Object

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

Method Detail

getSecureLong

public static long getSecureLong()

Get a cryptographically secure pseudo random long value.

Returns:

the random long value

getSecureBytes

public static byte[] getSecureBytes(int len)

Get a number of cryptographically secure pseudo random bytes.

Parameters:

len - the number of bytes

Returns:

the random bytes

nextInt

public static int nextInt(int lowerThan)

Get a pseudo random int value between 0 (including and the given value (excluding). The value is not cryptographically secure.

Parameters:

lowerThan - the value returned will be lower than this value

Returns:

the random long value

nextSecureInt

public static int nextSecureInt(int lowerThan)

Get a cryptographically secure pseudo random int value between 0 (including and the given value (excluding).

Parameters:

lowerThan - the value returned will be lower than this value

Returns:

the random long value