com.btmatthews.maven.plugins.crx.CRXSignatureHelper Maven / Gradle / Ivy

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A Maven 3 plug-in that can be used package and sign Google Chrome Extension projects

There is a newer version: 1.2.1

/*
 * Copyright 2012 Brian Matthews
 *
 * 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 com.btmatthews.maven.plugins.crx;

import java.security.GeneralSecurityException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;

import org.codehaus.plexus.component.annotations.Component;

/**
 * Implementation of {@link SignatureHelper} that signs a byte array using a public/private key pair.
 *
 * @author Brian Matthews
 * @since 1.1.0
 */
@Component(role = SignatureHelper.class, hint = "crx")
public class CRXSignatureHelper implements SignatureHelper {

    /**
     * The algorithm used to generate the signature.
     */
    private static final String ALGORITHM = "SHA1withRSA";

    /**
     * Generate the signature for a byte array using the private key.
     *
     * @param data The byte array.
     * @param key  private key.
     * @return The signature as a byte array.
     * @throws GeneralSecurityException If there was a error generating the signature.
     */
    public byte[] sign(final byte[] data, final PrivateKey key) throws GeneralSecurityException {
        final Signature signatureObject = Signature.getInstance(ALGORITHM);
        signatureObject.initSign(key);
        signatureObject.update(data);
        return signatureObject.sign();
    }

    /**
     * Check that the signature is valid using the public key.
     *
     * @param data      The data for which the signature was generated.
     * @param key       The public key.
     * @param signature The signature.
     * @return {@code true} if the signature was valid. Otherwise, {@code false}.
     * @throws GeneralSecurityException If there was an error validating the signature.
     */
    public boolean check(final byte[] data, final PublicKey key, final byte[] signature) throws
            GeneralSecurityException {
        final Signature signatureObject = Signature.getInstance(ALGORITHM);
        signatureObject.initVerify(key);
        signatureObject.update(data);
        return signatureObject.verify(signature);
    }
}