cliente.Signatures.java Source code

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Here is the source code for cliente.Signatures.java

Source

/*
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package cliente;

import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Security;
import java.security.Signature;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.bouncycastle.jce.provider.BouncyCastleProvider;

/**
 *
 * @author tiago
 */
public class Signatures {

    static public boolean verifySignature(PublicKey pubKey, byte[] data, byte[] signature) {
        boolean res = false;
        try {
            Security.addProvider(new BouncyCastleProvider());
            Signature sig = Signature.getInstance("SHA1withRSA", "BC");
            sig.initVerify(pubKey);
            sig.update(data);

            res = sig.verify(signature);
        } catch (Exception ex) {
            Logger.getLogger(DH_KeyAgreement.class.getName()).log(Level.SEVERE, null, ex);
        }

        return res;
    }

    static public byte[] generatingSignature(PrivateKey priv, byte[] data) {
        byte[] realSig = null;

        try {
            Security.addProvider(new BouncyCastleProvider());
            Signature dsa = Signature.getInstance("SHA1withRSA", "BC");
            dsa.initSign(priv);

            dsa.update(data);

            realSig = dsa.sign();

        } catch (Exception e) {
            System.err.println("Caught exception " + e.toString());
        }

        return realSig;
    }

}