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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.cms.jcajce;

import java.io.IOException;

import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.cms.ecc.ECCCMSSharedInfo;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.util.Pack;

class RFC5753KeyMaterialGenerator
    implements KeyMaterialGenerator
{
    public byte[] generateKDFMaterial(AlgorithmIdentifier keyAlgorithm, int keySize, byte[] userKeyMaterialParameters)
    {
        ECCCMSSharedInfo eccInfo = new ECCCMSSharedInfo(keyAlgorithm, userKeyMaterialParameters, Pack.intToBigEndian(keySize));

        try
        {
            return eccInfo.getEncoded(ASN1Encoding.DER);
        }
        catch (IOException e)
        {
            throw new IllegalStateException("Unable to create KDF material: " + e);
        }
    }
}