org.apache.xml.security.stax.impl.securityToken.ECKeyValueSecurityToken Maven / Gradle / Ivy

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Apache XML Security for Java supports XML-Signature Syntax and Processing, W3C Recommendation 12 February 2002, and XML Encryption Syntax and Processing, W3C Recommendation 10 December 2002. As of version 1.4, the library supports the standard Java API JSR-105: XML Digital Signature APIs.

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.xml.security.stax.impl.securityToken;

import org.apache.xml.security.binding.xmldsig11.ECKeyValueType;
import org.apache.xml.security.exceptions.XMLSecurityException;
import org.apache.xml.security.stax.ext.InboundSecurityContext;
import org.apache.xml.security.stax.impl.algorithms.ECDSAUtils;
import org.apache.xml.security.stax.impl.util.IDGenerator;
import org.apache.xml.security.stax.securityToken.SecurityTokenConstants;

import java.math.BigInteger;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.PublicKey;
import java.security.spec.*;

/**
 * @author $Author: coheigea $
 * @version $Revision: 1354898 $ $Date: 2012-06-28 11:19:02 +0100 (Thu, 28 Jun 2012) $
 */
public class ECKeyValueSecurityToken extends AbstractInboundSecurityToken {

    private ECKeyValueType ecKeyValueType;

    public ECKeyValueSecurityToken(ECKeyValueType ecKeyValueType, InboundSecurityContext inboundSecurityContext)
            throws XMLSecurityException {
        super(inboundSecurityContext, IDGenerator.generateID(null), SecurityTokenConstants.KeyIdentifier_KeyValue, true);

        if (ecKeyValueType.getECParameters() != null) {
            throw new XMLSecurityException("stax.ecParametersNotSupported");
        }
        if (ecKeyValueType.getNamedCurve() == null) {
            throw new XMLSecurityException("stax.namedCurveMissing");
        }
        this.ecKeyValueType = ecKeyValueType;
    }

    private PublicKey buildPublicKey(ECKeyValueType ecKeyValueType)
            throws InvalidKeySpecException, NoSuchAlgorithmException, XMLSecurityException {

        String oid = ecKeyValueType.getNamedCurve().getURI();
        if (oid.startsWith("urn:oid:")) {
            oid = oid.substring(8);
        }
        ECDSAUtils.ECCurveDefinition ecCurveDefinition = ECDSAUtils.getECCurveDefinition(oid);
        if (ecCurveDefinition == null) {
            throw new XMLSecurityException("stax.unsupportedKeyValue");
        }
        final EllipticCurve curve = new EllipticCurve(
                new ECFieldFp(
                        new BigInteger(ecCurveDefinition.getField(), 16)
                ),
                new BigInteger(ecCurveDefinition.getA(), 16),
                new BigInteger(ecCurveDefinition.getB(), 16)
        );
        ECPoint ecPointG = ECDSAUtils.decodePoint(ecKeyValueType.getPublicKey(), curve);
        ECPublicKeySpec ecPublicKeySpec = new ECPublicKeySpec(
                new ECPoint(
                        ecPointG.getAffineX(),
                        ecPointG.getAffineY()
                ),
                new ECParameterSpec(
                        curve,
                        new ECPoint(
                                new BigInteger(ecCurveDefinition.getX(), 16),
                                new BigInteger(ecCurveDefinition.getY(), 16)
                        ),
                        new BigInteger(ecCurveDefinition.getN(), 16),
                        ecCurveDefinition.getH()
                )
        );
        KeyFactory keyFactory = KeyFactory.getInstance("EC");
        return keyFactory.generatePublic(ecPublicKeySpec);
    }

    @Override
    public PublicKey getPublicKey() throws XMLSecurityException {
        if (super.getPublicKey() == null) {
            try {
                setPublicKey(buildPublicKey(this.ecKeyValueType));
            } catch (InvalidKeySpecException e) {
                throw new XMLSecurityException(e);
            } catch (NoSuchAlgorithmException e) {
                throw new XMLSecurityException(e);
            }
        }
        return super.getPublicKey();
    }

    @Override
    public boolean isAsymmetric() {
        return true;
    }

    @Override
    public SecurityTokenConstants.TokenType getTokenType() {
        return SecurityTokenConstants.KeyValueToken;
    }
}