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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 and up. 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.ITSPublicVerificationKey;
import org.bouncycastle.math.ec.ECCurve;
import org.bouncycastle.math.ec.ECPoint;
import org.bouncycastle.oer.its.EccCurvePoint;
import org.bouncycastle.oer.its.EccP256CurvePoint;
import org.bouncycastle.oer.its.EccP384CurvePoint;
import org.bouncycastle.oer.its.PublicVerificationKey;

public class BcITSPublicVerificationKey
    extends ITSPublicVerificationKey
{
    public BcITSPublicVerificationKey(PublicVerificationKey verificationKey)
    {
        super(verificationKey);
    }

    static PublicVerificationKey fromKeyParameters(ECPublicKeyParameters pubKey)
    {
        ASN1ObjectIdentifier curveID = ((ECNamedDomainParameters)pubKey.getParameters()).getName();
        ECPoint q  = pubKey.getQ();

        if (curveID.equals(SECObjectIdentifiers.secp256r1))
        {
            return new PublicVerificationKey(
                PublicVerificationKey.ecdsaNistP256,
                    EccP256CurvePoint.builder()
                        .createUncompressedP256(
                            q.getAffineXCoord().toBigInteger(),
                            q.getAffineYCoord().toBigInteger()));
        }
        else if (curveID.equals(TeleTrusTObjectIdentifiers.brainpoolP256r1))
        {
            return new PublicVerificationKey(
                PublicVerificationKey.ecdsaBrainpoolP256r1,
                    EccP256CurvePoint.builder()
                        .createUncompressedP256(
                            q.getAffineXCoord().toBigInteger(),
                            q.getAffineYCoord().toBigInteger()));
        }
        else if (curveID.equals(TeleTrusTObjectIdentifiers.brainpoolP384r1))
        {
            return new PublicVerificationKey(
                PublicVerificationKey.ecdsaBrainpoolP384r1,
                    EccP384CurvePoint.builder()
                        .createUncompressedP384(
                            q.getAffineXCoord().toBigInteger(),
                            q.getAffineYCoord().toBigInteger()));
        }
        else
        {
            throw new IllegalArgumentException("unknown curve in public encryption key");
        }
    }

    public BcITSPublicVerificationKey(AsymmetricKeyParameter verificationKey)
    {
        super(fromKeyParameters((ECPublicKeyParameters)verificationKey));
    }

    public AsymmetricKeyParameter getKey()
    {
        X9ECParameters params;
        ASN1ObjectIdentifier curveID;

        switch (verificationKey.getChoice())
        {
        case PublicVerificationKey.ecdsaNistP256:
            curveID = SECObjectIdentifiers.secp256r1;
            params = NISTNamedCurves.getByOID(SECObjectIdentifiers.secp256r1);
            break;
        case PublicVerificationKey.ecdsaBrainpoolP256r1:
            curveID = TeleTrusTObjectIdentifiers.brainpoolP256r1;
            params = TeleTrusTNamedCurves.getByOID(TeleTrusTObjectIdentifiers.brainpoolP256r1);
            break;
        case PublicVerificationKey.ecdsaBrainpoolP384r1:
            curveID = TeleTrusTObjectIdentifiers.brainpoolP384r1;
            params = TeleTrusTNamedCurves.getByOID(TeleTrusTObjectIdentifiers.brainpoolP384r1);
            break;
        default:
            throw new IllegalStateException("unknown key type");
        }
        ECCurve curve = params.getCurve();

        ASN1Encodable pviCurvePoint = verificationKey.getCurvePoint();
        final EccCurvePoint itsPoint;
        if (pviCurvePoint instanceof EccCurvePoint)
        {
            itsPoint = (EccCurvePoint)verificationKey.getCurvePoint();
        }
        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));
    }
}