RawSignatureVerifier.java

package es.uji.security.crypto.raw;

import java.io.IOException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.Provider;
import java.security.Signature;
import java.security.SignatureException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

import es.uji.security.crypto.VerificationResult;

public class RawSignatureVerifier
{
    public VerificationResult verify(byte[] data, byte[] signature, X509Certificate caCertificate, Provider provider)
            throws CertificateException, IOException, NoSuchAlgorithmException,
            InvalidKeyException, SignatureException
    {
        Signature rsa_vfy = Signature.getInstance("SHA1withRSA", provider);
        rsa_vfy.initVerify(caCertificate.getPublicKey());
        rsa_vfy.update(data);

        VerificationResult verificationDetails = new VerificationResult();
        verificationDetails.setValid(rsa_vfy.verify(signature));       
        
        if (! verificationDetails.isValid())
        {
            verificationDetails.addError("RAW signature can not be verified");
        }
        
        return verificationDetails;
    }
}