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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 1.4. 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.bc;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.nist.NISTObjectIdentifiers;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.crypto.params.KeyParameter;

class AESUtil
{
    static AlgorithmIdentifier determineKeyEncAlg(KeyParameter key)
    {
        int length = key.getKey().length * 8;
        ASN1ObjectIdentifier wrapOid;

        if (length == 128)
        {
            wrapOid = NISTObjectIdentifiers.id_aes128_wrap;
        }
        else if (length == 192)
        {
            wrapOid = NISTObjectIdentifiers.id_aes192_wrap;
        }
        else if (length == 256)
        {
            wrapOid = NISTObjectIdentifiers.id_aes256_wrap;
        }
        else
        {
            throw new IllegalArgumentException("illegal keysize in AES");
        }

        return new AlgorithmIdentifier(wrapOid); // parameters absent
    }
}