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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.util.test;
import java.security.SecureRandom;
import org.bouncycastle.crypto.prng.EntropySource;
import org.bouncycastle.crypto.prng.EntropySourceProvider;
/**
* A class for returning "quick entropy" for testing purposes.
*/
public class TestRandomEntropySourceProvider
implements EntropySourceProvider
{
private final SecureRandom _sr;
private final boolean _predictionResistant;
/**
* Create a test entropy source provider.
*
* @param isPredictionResistant boolean indicating if the SecureRandom is based on prediction resistant entropy or not (true if it is).
*/
public TestRandomEntropySourceProvider(boolean isPredictionResistant)
{
_sr = new SecureRandom();
_predictionResistant = isPredictionResistant;
}
/**
* Return an entropy source that will create bitsRequired bits of entropy on
* each invocation of getEntropy().
*
* @param bitsRequired size (in bits) of entropy to be created by the provided source.
* @return an EntropySource that generates bitsRequired bits of entropy on each call to its getEntropy() method.
*/
public EntropySource get(final int bitsRequired)
{
return new EntropySource()
{
public boolean isPredictionResistant()
{
return _predictionResistant;
}
public byte[] getEntropy()
{
byte[] rv = new byte[(bitsRequired + 7) / 8];
_sr.nextBytes(rv);
return rv;
}
public int entropySize()
{
return bitsRequired;
}
};
}
}
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