io.jsonwebtoken.impl.crypto.EllipticCurveSignatureValidator Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of jjwt Show documentation

Legacy dependency. Please update your dependencies as documented here: https://github.com/jwtk/jjwt#installation

There is a newer version: 0.12.6

/*
 * Copyright (C) 2015 jsonwebtoken.io
 *
 * Licensed 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 io.jsonwebtoken.impl.crypto;

import io.jsonwebtoken.SignatureAlgorithm;
import io.jsonwebtoken.SignatureException;
import io.jsonwebtoken.lang.Assert;

import java.security.InvalidKeyException;
import java.security.Key;
import java.security.PublicKey;
import java.security.Signature;
import java.security.interfaces.ECPublicKey;

public class EllipticCurveSignatureValidator extends EllipticCurveProvider implements SignatureValidator {

    private static final String EC_PUBLIC_KEY_REQD_MSG =
        "Elliptic Curve signature validation requires an ECPublicKey instance.";

    public EllipticCurveSignatureValidator(SignatureAlgorithm alg, Key key) {
        super(alg, key);
        Assert.isTrue(key instanceof ECPublicKey, EC_PUBLIC_KEY_REQD_MSG);
    }

    @Override
    public boolean isValid(byte[] data, byte[] signature) {
        Signature sig = createSignatureInstance();
        PublicKey publicKey = (PublicKey) key;
        try {
            return doVerify(sig, publicKey, data, signature);
        } catch (Exception e) {
            String msg = "Unable to verify Elliptic Curve signature using configured ECPublicKey. " + e.getMessage();
            throw new SignatureException(msg, e);
        }
    }

    protected boolean doVerify(Signature sig, PublicKey publicKey, byte[] data, byte[] signature)
        throws InvalidKeyException, java.security.SignatureException {
        sig.initVerify(publicKey);
        sig.update(data);
        return sig.verify(signature);
    }

}