org.bouncycastle.its.jcajce.JceITSPublicEncryptionKey Maven / Gradle / Ivy

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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.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.ITSPublicEncryptionKey;
import org.bouncycastle.jcajce.provider.asymmetric.util.EC5Util;
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.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 JceITSPublicEncryptionKey
    extends ITSPublicEncryptionKey
{
    private final JcaJceHelper helper;

    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 JceITSPublicEncryptionKey build(PublicEncryptionKey encryptionKey)
        {
            return new JceITSPublicEncryptionKey(encryptionKey, helper);
        }

        public JceITSPublicEncryptionKey build(PublicKey encryptionKey)
        {
            return new JceITSPublicEncryptionKey(encryptionKey, helper);
        }
    }

    JceITSPublicEncryptionKey(PublicEncryptionKey encryptionKey, JcaJceHelper helper)
    {
        super(encryptionKey);
        this.helper = helper;
    }

    JceITSPublicEncryptionKey(PublicKey encryptionKey, JcaJceHelper helper)
    {
        super(fromPublicKey(encryptionKey));
        this.helper = helper;
    }

    static PublicEncryptionKey fromPublicKey(PublicKey key)
    {
        if (!(key instanceof ECPublicKey))
        {
            throw new IllegalArgumentException("must be ECPublicKey instance");
        }

        ECPublicKey pKey = (ECPublicKey)key;

        ASN1ObjectIdentifier curveID = ASN1ObjectIdentifier.getInstance(
            SubjectPublicKeyInfo.getInstance(key.getEncoded()).getAlgorithm().getParameters());

        if (curveID.equals(SECObjectIdentifiers.secp256r1))
        {
            return new PublicEncryptionKey(
                SymmAlgorithm.aes128Ccm,
                new BasePublicEncryptionKey.Builder()
                    .setChoice(BasePublicEncryptionKey.eciesNistP256)
                    .setValue(EccP256CurvePoint.builder()
                        .createUncompressedP256(
                            pKey.getW().getAffineX(),
                            pKey.getW().getAffineY()))
                    .createBasePublicEncryptionKey());
        }
        else if (curveID.equals(TeleTrusTObjectIdentifiers.brainpoolP256r1))
        {
            return new PublicEncryptionKey(
                SymmAlgorithm.aes128Ccm,
                new BasePublicEncryptionKey.Builder()
                    .setChoice(BasePublicEncryptionKey.eciesBrainpoolP256r1)
                    .setValue(EccP256CurvePoint.builder()
                        .createUncompressedP256(
                            pKey.getW().getAffineX(),
                            pKey.getW().getAffineY()))
                    .createBasePublicEncryptionKey());
        }
        else
        {
            throw new IllegalArgumentException("unknown curve in public encryption key");
        }

    }

    public PublicKey getKey()
    {
        BasePublicEncryptionKey baseKey = encryptionKey.getBasePublicEncryptionKey();
        X9ECParameters params;

        switch (baseKey.getChoice())
        {
        case BasePublicEncryptionKey.eciesNistP256:

            params = NISTNamedCurves.getByOID(SECObjectIdentifiers.secp256r1);
            break;
        case BasePublicEncryptionKey.eciesBrainpoolP256r1:
            params = TeleTrusTNamedCurves.getByOID(TeleTrusTObjectIdentifiers.brainpoolP256r1);
            break;
        default:
            throw new IllegalStateException("unknown key type");
        }

        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");
        }
        ECCurve curve = params.getCurve();

        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 = EC5Util.convertToSpec(params);
            java.security.spec.ECPoint jPoint = EC5Util.convertPoint(point);
            return keyFactory.generatePublic(new ECPublicKeySpec(jPoint, spec));
        }
        catch (Exception e)
        {
            throw new IllegalStateException(e.getMessage(), e);
        }
    }
}