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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.its.bc;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.nist.NISTNamedCurves;
import org.bouncycastle.asn1.sec.SECObjectIdentifiers;
import org.bouncycastle.asn1.teletrust.TeleTrusTNamedCurves;
import org.bouncycastle.asn1.teletrust.TeleTrusTObjectIdentifiers;
import org.bouncycastle.asn1.x9.X9ECParameters;
import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
import org.bouncycastle.crypto.params.ECNamedDomainParameters;
import org.bouncycastle.crypto.params.ECPublicKeyParameters;
import org.bouncycastle.its.ITSPublicEncryptionKey;
import org.bouncycastle.math.ec.ECCurve;
import org.bouncycastle.math.ec.ECPoint;
import org.bouncycastle.oer.its.BasePublicEncryptionKey;
import org.bouncycastle.oer.its.EccCurvePoint;
import org.bouncycastle.oer.its.EccP256CurvePoint;
import org.bouncycastle.oer.its.EccP384CurvePoint;
import org.bouncycastle.oer.its.PublicEncryptionKey;
import org.bouncycastle.oer.its.SymmAlgorithm;

public class BcITSPublicEncryptionKey
    extends ITSPublicEncryptionKey
{
    public BcITSPublicEncryptionKey(PublicEncryptionKey encryptionKey)
    {
        super(encryptionKey);
    }

    static PublicEncryptionKey fromKeyParameters(ECPublicKeyParameters pubKey)
    {
        ASN1ObjectIdentifier curveID = ((ECNamedDomainParameters)pubKey.getParameters()).getName();
        ECPoint q  = pubKey.getQ();
        
        if (curveID.equals(SECObjectIdentifiers.secp256r1))
        {
            return new PublicEncryptionKey(
                SymmAlgorithm.aes128Ccm,
                new BasePublicEncryptionKey.Builder()
                    .setChoice(BasePublicEncryptionKey.eciesNistP256)
                    .setValue(EccP256CurvePoint.builder()
                        .createUncompressedP256(
                            q.getAffineXCoord().toBigInteger(),
                            q.getAffineYCoord().toBigInteger()))
                    .createBasePublicEncryptionKey());
        }
        else if (curveID.equals(TeleTrusTObjectIdentifiers.brainpoolP256r1))
        {
            return new PublicEncryptionKey(
                SymmAlgorithm.aes128Ccm,
                new BasePublicEncryptionKey.Builder()
                    .setChoice(BasePublicEncryptionKey.eciesBrainpoolP256r1)
                    .setValue(EccP256CurvePoint.builder()
                        .createUncompressedP256(
                            q.getAffineXCoord().toBigInteger(),
                            q.getAffineYCoord().toBigInteger()))
                    .createBasePublicEncryptionKey());
        }
        else
        {
            throw new IllegalArgumentException("unknown curve in public encryption key");
        }
    }

    public BcITSPublicEncryptionKey(AsymmetricKeyParameter encryptionKey)
    {
        super(fromKeyParameters((ECPublicKeyParameters)encryptionKey));
    }

    public AsymmetricKeyParameter getKey()
    {
        X9ECParameters params;

        BasePublicEncryptionKey baseKey = encryptionKey.getBasePublicEncryptionKey();
        ASN1ObjectIdentifier curveID;

        switch (baseKey.getChoice())
        {
        case BasePublicEncryptionKey.eciesNistP256:
            curveID = SECObjectIdentifiers.secp256r1;
            params = NISTNamedCurves.getByOID(SECObjectIdentifiers.secp256r1);
            break;
        case BasePublicEncryptionKey.eciesBrainpoolP256r1:
            curveID = TeleTrusTObjectIdentifiers.brainpoolP256r1;
            params = TeleTrusTNamedCurves.getByOID(TeleTrusTObjectIdentifiers.brainpoolP256r1);
            break;
        default:
            throw new IllegalStateException("unknown key type");
        }
        ECCurve curve = params.getCurve();

        ASN1Encodable pviCurvePoint = encryptionKey.getBasePublicEncryptionKey().getValue();
        final EccCurvePoint itsPoint;
        if (pviCurvePoint instanceof EccCurvePoint)
        {
            itsPoint = (EccCurvePoint)baseKey.getValue();
        }
        else
        {
            throw new IllegalStateException("extension to public verification key not supported");
        }

        byte[] key;

        if (itsPoint instanceof EccP256CurvePoint)
        {
            key = itsPoint.getEncodedPoint();
        }
        else if (itsPoint instanceof EccP384CurvePoint)
        {
            key = itsPoint.getEncodedPoint();
        }
        else
        {
            throw new IllegalStateException("unknown key type");
        }

        ECPoint point = curve.decodePoint(key).normalize();
        return new ECPublicKeyParameters(point,
            new ECNamedDomainParameters(curveID, params));
    }
}