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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.its.jcajce;

import java.security.KeyFactory;
import java.security.Provider;
import java.security.PublicKey;
import java.security.interfaces.ECPublicKey;
import java.security.spec.ECParameterSpec;
import java.security.spec.ECPublicKeySpec;

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.x509.SubjectPublicKeyInfo;
import org.bouncycastle.asn1.x9.X9ECParameters;
import org.bouncycastle.its.ITSPublicVerificationKey;
import org.bouncycastle.jcajce.util.DefaultJcaJceHelper;
import org.bouncycastle.jcajce.util.JcaJceHelper;
import org.bouncycastle.jcajce.util.NamedJcaJceHelper;
import org.bouncycastle.jcajce.util.ProviderJcaJceHelper;
import org.bouncycastle.math.ec.ECCurve;
import org.bouncycastle.math.ec.ECPoint;
import org.bouncycastle.oer.its.ieee1609dot2.basetypes.EccCurvePoint;
import org.bouncycastle.oer.its.ieee1609dot2.basetypes.EccP256CurvePoint;
import org.bouncycastle.oer.its.ieee1609dot2.basetypes.EccP384CurvePoint;
import org.bouncycastle.oer.its.ieee1609dot2.basetypes.Point256;
import org.bouncycastle.oer.its.ieee1609dot2.basetypes.Point384;
import org.bouncycastle.oer.its.ieee1609dot2.basetypes.PublicVerificationKey;

public class JcaITSPublicVerificationKey
    extends ITSPublicVerificationKey
{
    public static class Builder
    {
        private JcaJceHelper helper = new DefaultJcaJceHelper();

        public Builder setProvider(Provider provider)
        {
            this.helper = new ProviderJcaJceHelper(provider);

            return this;
        }

        public Builder setProvider(String providerName)
        {
            this.helper = new NamedJcaJceHelper(providerName);

            return this;
        }

        public JcaITSPublicVerificationKey build(PublicVerificationKey verificationKey)
        {
            return new JcaITSPublicVerificationKey(verificationKey, helper);
        }

        public JcaITSPublicVerificationKey build(PublicKey verificationKey)
        {
            return new JcaITSPublicVerificationKey(verificationKey, helper);
        }
    }

    private final JcaJceHelper helper;

    JcaITSPublicVerificationKey(PublicVerificationKey encryptionKey, JcaJceHelper helper)
    {
        super(encryptionKey);
        this.helper = helper;
    }

    JcaITSPublicVerificationKey(PublicKey verificationKey, JcaJceHelper helper)
    {
        super(fromKeyParameters((ECPublicKey)verificationKey));
        this.helper = helper;
    }

    static PublicVerificationKey fromKeyParameters(ECPublicKey pubKey)
    {
        ASN1ObjectIdentifier curveID = ASN1ObjectIdentifier.getInstance(
            SubjectPublicKeyInfo.getInstance(pubKey.getEncoded()).getAlgorithm().getParameters());

        if (curveID.equals(SECObjectIdentifiers.secp256r1))
        {
            return new PublicVerificationKey(
                PublicVerificationKey.ecdsaNistP256,
                EccP256CurvePoint.uncompressedP256(Point256.builder()
                    .setX(pubKey.getW().getAffineX())
                    .setY(pubKey.getW().getAffineY())
                    .createPoint256()));
        }
        else if (curveID.equals(TeleTrusTObjectIdentifiers.brainpoolP256r1))
        {
            return new PublicVerificationKey(
                PublicVerificationKey.ecdsaBrainpoolP256r1,
                EccP256CurvePoint.uncompressedP256(Point256.builder()
                        .setX(pubKey.getW().getAffineX())
                        .setY(pubKey.getW().getAffineY())
                        .createPoint256())
                    );
        }
        else if (curveID.equals(TeleTrusTObjectIdentifiers.brainpoolP384r1))
        {
            return new PublicVerificationKey(
                PublicVerificationKey.ecdsaBrainpoolP384r1,
                EccP384CurvePoint.uncompressedP384(Point384.builder()
                    .setX(pubKey.getW().getAffineX())
                    .setY(pubKey.getW().getAffineY())
                    .createPoint384())
            );
        }
        else
        {
            throw new IllegalArgumentException("unknown curve in public encryption key");
        }
    }

    public PublicKey getKey()
    {
        X9ECParameters params;

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

        ASN1Encodable pviCurvePoint = verificationKey.getPublicVerificationKey();
        final EccCurvePoint itsPoint;
        if (pviCurvePoint instanceof EccCurvePoint)
        {
            itsPoint = (EccCurvePoint)verificationKey.getPublicVerificationKey();
        }
        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();
        try
        {
            KeyFactory keyFactory = helper.createKeyFactory("EC");
            ECParameterSpec spec = ECUtil.convertToSpec(params);
            java.security.spec.ECPoint jPoint = ECUtil.convertPoint(point);
            return keyFactory.generatePublic(new ECPublicKeySpec(jPoint, spec));
        }
        catch (Exception e)
        {
            throw new IllegalStateException(e.getMessage(), e);
        }
    }
}