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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 1.7. Note: this package includes the IDEA and NTRU encryption algorithms.

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package org.bouncycastle.jcajce.provider.asymmetric.util;

import org.bouncycastle.crypto.engines.IESEngine;
import org.bouncycastle.jce.spec.IESParameterSpec;

public class IESUtil
{
    public static IESParameterSpec guessParameterSpec(IESEngine engine)
    {
        if (engine.getCipher() == null)
        {
            return new IESParameterSpec(null, null, 128);
        }
        else if (engine.getCipher().getUnderlyingCipher().getAlgorithmName().equals("DES") ||
                engine.getCipher().getUnderlyingCipher().getAlgorithmName().equals("RC2") ||
                engine.getCipher().getUnderlyingCipher().getAlgorithmName().equals("RC5-32") ||
                engine.getCipher().getUnderlyingCipher().getAlgorithmName().equals("RC5-64"))
        {
            return new IESParameterSpec(null, null, 64, 64);
        }
        else if (engine.getCipher().getUnderlyingCipher().getAlgorithmName().equals("SKIPJACK"))
        {
            return new IESParameterSpec(null, null, 80, 80);
        }
        else if (engine.getCipher().getUnderlyingCipher().getAlgorithmName().equals("GOST28147"))
        {
            return new IESParameterSpec(null, null, 256, 256);
        }

        return new IESParameterSpec(null, null, 128, 128);
    }
}