org.jnotary.crypto.Signer.java Source code

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Here is the source code for org.jnotary.crypto.Signer.java

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/*******************************************************************************
 * Copyright (c) 2013 aib.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/gpl.html
 * 
 * Contributors:
 *     aib - initial API and implementation
 ******************************************************************************/
package org.jnotary.crypto;

import java.security.Security;

import org.bouncycastle.cms.CMSProcessableByteArray;
import org.bouncycastle.cms.CMSSignedData;
import org.bouncycastle.cms.CMSSignedDataGenerator;
import org.bouncycastle.cms.CMSTypedData;
import org.bouncycastle.cms.jcajce.JcaSignerInfoGeneratorBuilder;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.operator.ContentSigner;
import org.bouncycastle.operator.jcajce.JcaContentSignerBuilder;
import org.bouncycastle.operator.jcajce.JcaDigestCalculatorProviderBuilder;

public class Signer {

    private String algorithm = "SHA1withRSA";

    static {
        Security.addProvider(new BouncyCastleProvider());
    }

    public class Parameters {
        private boolean detached = false;
        private boolean addSignerSertificate = true;

        public Parameters() {
        }

        public boolean isDetached() {
            return detached;
        }

        public void setDetached(boolean detached) {
            this.detached = detached;
        }

        public boolean isAddSignerSertificate() {
            return addSignerSertificate;
        }

        public void setAddSignerSertificate(boolean addSignerSertificate) {
            this.addSignerSertificate = addSignerSertificate;
        }
    }

    public Signer(String algorithm) {
        this.algorithm = algorithm;
    }

    public Parameters getDefaultParameters() {
        return new Parameters();
    }

    public byte[] sign(UserKeyStore myStorage, byte[] content) throws Exception {
        return sign(myStorage, content, getDefaultParameters());
    }

    public byte[] sign(UserKeyStore myStorage, byte[] content, Parameters parameters) throws Exception {

        CMSSignedDataGenerator gen = new CMSSignedDataGenerator();
        ContentSigner sha1Signer = new JcaContentSignerBuilder(algorithm).setProvider("BC")
                .build(myStorage.getPrivateKey());

        gen.addSignerInfoGenerator(new JcaSignerInfoGeneratorBuilder(
                new JcaDigestCalculatorProviderBuilder().setProvider("BC").build()).build(sha1Signer,
                        myStorage.getUserCertificate()));

        if (parameters.isAddSignerSertificate())
            gen.addCertificates(myStorage.getCertStore());

        CMSTypedData msg = new CMSProcessableByteArray(content);
        CMSSignedData sigData = gen.generate(msg, !parameters.isDetached());
        return sigData.getEncoded();
    }

}