VerifyPKCS7Signature.java

/*
 * GovWay - A customizable API Gateway 
 * https://govway.org
 * 
 * Copyright (c) 2005-2025 Link.it srl (https://link.it). 
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3, as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */


package org.openspcoop2.utils.security;

import java.security.Security;
import java.security.cert.Certificate;
import java.util.Collection;

import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.cms.CMSProcessable;
import org.bouncycastle.cms.CMSSignedData;
import org.bouncycastle.cms.SignerInformation;
import org.bouncycastle.cms.jcajce.JcaSimpleSignerInfoVerifierBuilder;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.openspcoop2.utils.UtilsException;
import org.openspcoop2.utils.certificate.KeyStore;

/** 
 * VerifySignature
 *
 * @author Poli Andrea (apoli@link.it)
 * @author $Author$
 * @version $Rev$, $Date$
 */
public class VerifyPKCS7Signature {

    private KeyStore keystore;
    private Certificate certificate;
    private BouncyCastleProvider bouncyCastleProvider;
    private byte[] originalContent;
    
    public VerifyPKCS7Signature(KeyStore keystore) throws UtilsException{
        this.keystore = keystore;
        this.certificate = this.keystore.getCertificate();
    }
    public VerifyPKCS7Signature(KeyStore keystore, String alias) throws UtilsException{
        this.keystore = keystore;
        this.certificate = this.keystore.getCertificate(alias);
        
        this.bouncyCastleProvider = new BouncyCastleProvider();
        Security.addProvider(this.bouncyCastleProvider);
    }
    
    public boolean verify(byte[] signatureData, String algorithm) throws UtilsException{
        try{
            CMSSignedData cmsSignedData = new CMSSignedData(signatureData);
            
            try{
                Collection<SignerInformation> signers = cmsSignedData.getSignerInfos().getSigners();
                X509CertificateHolder ch = new X509CertificateHolder(this.certificate.getEncoded());
                for (SignerInformation si : signers)
                    if (si.getSID().match(ch))
                        if (si.verify(new JcaSimpleSignerInfoVerifierBuilder().setProvider(this.bouncyCastleProvider).build(ch)))
                            return true;
                
                return false;
            }finally {
                 //Retrieve the json content from pkcs7
                CMSProcessable signedContent = cmsSignedData.getSignedContent();
                this.originalContent = (byte[]) signedContent.getContent();
            }
        
        }catch(Exception e){
            throw new UtilsException(e.getMessage(),e);
        }
    }

    public byte[] getOriginalContent() {
        return this.originalContent;
    }
}