Package org.apache.hadoop.crypto.random

Class OpensslSecureRandom

java.lang.Object

java.util.Random

org.apache.hadoop.crypto.random.OpensslSecureRandom

All Implemented Interfaces:

java.io.Serializable

@Private
public class OpensslSecureRandom
extends java.util.Random

OpenSSL secure random using JNI. This implementation is thread-safe.

If using an Intel chipset with RDRAND, the high-performance hardware random number generator will be used and it's much faster than SecureRandom. If RDRAND is unavailable, default OpenSSL secure random generator will be used. It's still faster and can generate strong random bytes.

See https://wiki.openssl.org/index.php/Random_Numbers See http://en.wikipedia.org/wiki/RdRand

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor	Description
OpensslSecureRandom()

Method Summary

Modifier and Type	Method	Description
static boolean	isNativeCodeLoaded()
protected int	next(int numBits)	Generates an integer containing the user-specified number of random bits (right justified, with leading zeros).
void	nextBytes(byte[] bytes)	Generates a user-specified number of random bytes.
void	setSeed(long seed)

Methods inherited from class java.util.Random

doubles, doubles, doubles, doubles, ints, ints, ints, ints, longs, longs, longs, longs, nextBoolean, nextDouble, nextFloat, nextGaussian, nextInt, nextInt, nextLong

Methods inherited from class java.lang.Object

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

Constructor Detail

OpensslSecureRandom

public OpensslSecureRandom()

Method Detail

isNativeCodeLoaded

public static boolean isNativeCodeLoaded()

nextBytes

public void nextBytes(byte[] bytes)

Generates a user-specified number of random bytes. It's thread-safe.

Overrides:

nextBytes in class java.util.Random

Parameters:

bytes - the array to be filled in with random bytes.

setSeed

public void setSeed(long seed)

Overrides:

setSeed in class java.util.Random

next

protected final int next(int numBits)

Generates an integer containing the user-specified number of random bits (right justified, with leading zeros).

Overrides:

next in class java.util.Random

Parameters:

numBits - number of random bits to be generated, where 0 <= numBits <= 32.

Returns:

int an int containing the user-specified number of random bits (right justified, with leading zeros).