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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 and up.

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

import java.security.AlgorithmParameters;
import java.security.spec.AlgorithmParameterSpec;

class SpecUtil
{
    static AlgorithmParameterSpec extractSpec(AlgorithmParameters params, Class[] availableSpecs)
    {
        try
        {
            return params.getParameterSpec(AlgorithmParameterSpec.class);
        }
        catch (Exception e)
        {
            for (int i = 0; i != availableSpecs.length; i++)
            {
                if (availableSpecs[i] == null)
                {
                    continue;
                }

                try
                {
                    return params.getParameterSpec(availableSpecs[i]);
                }
                catch (Exception ex)
                {
                    // try again if possible
                }
            }
        }

        return null;
    }
}