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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 1.8 and up. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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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));
    }
}