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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 and up. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.crypto.params;

import java.math.BigInteger;
import java.security.SecureRandom;

import org.bouncycastle.crypto.KeyGenerationParameters;

public class RSAKeyGenerationParameters
    extends KeyGenerationParameters
{
    private BigInteger publicExponent;
    private int certainty;

    public RSAKeyGenerationParameters(
        BigInteger      publicExponent,
        SecureRandom    random,
        int             strength,
        int             certainty)
    {
        super(random, strength);

        if (strength < 12)
        {
            throw new IllegalArgumentException("key strength too small");
        }

        //
        // public exponent cannot be even
        //
        if (!publicExponent.testBit(0)) 
        {
                throw new IllegalArgumentException("public exponent cannot be even");
        }
        
        this.publicExponent = publicExponent;
        this.certainty = certainty;
    }

    public BigInteger getPublicExponent()
    {
        return publicExponent;
    }

    public int getCertainty()
    {
        return certainty;
    }
}