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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.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
    }
}