io.jsonwebtoken.impl.crypto.EllipticCurveSigner 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 java.security.InvalidKeyException;
import java.security.Key;
import java.security.PrivateKey;
import java.security.Signature;
import java.security.interfaces.ECKey;
import java.security.interfaces.ECPrivateKey;

import io.jsonwebtoken.JwtException;
import io.jsonwebtoken.SignatureAlgorithm;
import io.jsonwebtoken.SignatureException;

public class EllipticCurveSigner extends EllipticCurveProvider implements Signer {

    public EllipticCurveSigner(SignatureAlgorithm alg, Key key) {
        super(alg, key);
        if (!(key instanceof PrivateKey && key instanceof ECKey)) {
            String msg = "Elliptic Curve signatures must be computed using an EC PrivateKey.  The specified key of " +
                         "type " + key.getClass().getName() + " is not an EC PrivateKey.";
            throw new IllegalArgumentException(msg);
        }
    }

    @Override
    public byte[] sign(byte[] data) {
        try {
            return doSign(data);
        } catch (InvalidKeyException e) {
            throw new SignatureException("Invalid Elliptic Curve PrivateKey. " + e.getMessage(), e);
        } catch (java.security.SignatureException e) {
            throw new SignatureException("Unable to calculate signature using Elliptic Curve PrivateKey. " + e.getMessage(), e);
        } catch (JwtException e) {
            throw new SignatureException("Unable to convert signature to JOSE format. " + e.getMessage(), e);
        }
    }

    protected byte[] doSign(byte[] data) throws InvalidKeyException, java.security.SignatureException, JwtException {
        PrivateKey privateKey = (PrivateKey)key;
        Signature sig = createSignatureInstance();
        sig.initSign(privateKey);
        sig.update(data);
        return transcodeSignatureToConcat(sig.sign(), getSignatureByteArrayLength(alg));
    }
}