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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 to JDK 1.8. 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.operator.jcajce;

import java.security.Key;

import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.operator.GenericKey;

public class JceGenericKey
    extends GenericKey
{
    /**
     * Attempt to simplify the key representation if possible.
     *
     * @param key a provider based key
     * @return the byte encoding if one exists, key object otherwise.
     */
    private static Object getRepresentation(Key key)
    {
        byte[] keyBytes = key.getEncoded();

        if (keyBytes != null)
        {
            return keyBytes;
        }

        return key;
    }

    public JceGenericKey(AlgorithmIdentifier algorithmIdentifier, Key representation)
    {
        super(algorithmIdentifier, getRepresentation(representation));
    }
}