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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.signers;
import java.math.BigInteger;
import java.security.SecureRandom;
public class RandomDSAKCalculator
implements DSAKCalculator
{
private static final BigInteger ZERO = BigInteger.valueOf(0);
private BigInteger q;
private SecureRandom random;
public boolean isDeterministic()
{
return false;
}
public void init(BigInteger n, SecureRandom random)
{
this.q = n;
this.random = random;
}
public void init(BigInteger n, BigInteger d, byte[] message)
{
throw new IllegalStateException("Operation not supported");
}
public BigInteger nextK()
{
int qBitLength = q.bitLength();
BigInteger k;
do
{
k = new BigInteger(qBitLength, random);
}
while (k.equals(ZERO) || k.compareTo(q) >= 0);
return k;
}
}
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