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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8 with debug enabled.
package org.bouncycastle.crypto.prng;
import java.security.SecureRandom;
public class X931SecureRandom
extends SecureRandom
{
private final boolean predictionResistant;
private final SecureRandom randomSource;
private final X931RNG drbg;
X931SecureRandom(SecureRandom randomSource, X931RNG drbg, boolean predictionResistant)
{
this.randomSource = randomSource;
this.drbg = drbg;
this.predictionResistant = predictionResistant;
}
public void setSeed(byte[] seed)
{
synchronized (this)
{
if (randomSource != null)
{
this.randomSource.setSeed(seed);
}
}
}
public void setSeed(long seed)
{
synchronized (this)
{
// this will happen when SecureRandom() is created
if (randomSource != null)
{
this.randomSource.setSeed(seed);
}
}
}
public void nextBytes(byte[] bytes)
{
synchronized (this)
{
// check if a reseed is required...
if (drbg.generate(bytes, predictionResistant) < 0)
{
drbg.reseed();
drbg.generate(bytes, predictionResistant);
}
}
}
public byte[] generateSeed(int numBytes)
{
return EntropyUtil.generateSeed(drbg.getEntropySource(), numBytes);
}
}
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