Java Requires Chilkat v11.0.0+

Create PKCS1 RSA Signature with PEM Private Key

See more RSA Examples

Demonstrates how to load a private key from a PEM file and create a PKCS1 RSA digital signature. Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.PrivateKey;
import com.chilkatsoft.chilkat2.Rsa;

public class ChilkatExample {

    public static void main(String[] args) {
        // This example assumes the Chilkat API to have been previously unlocked.
        // See Global Unlock Sample for sample code.

        PrivateKey pkey = new PrivateKey();

        // Load the private key from an RSA PEM file:
        try {
            pkey.loadPemFile("pvkey2_rsa.pem");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        Rsa rsa = new Rsa();

        // Import the private key into the RSA object:
        try {
            rsa.usePrivateKey(pkey);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Get the signature as hex.
        rsa.setEncodingMode("hex");

        String strData = "This is the string to be signed.";

        // Sign the string using the sha-1 hash algorithm.
        // Other valid choices are "md2", "md5", "sha256",
        // "sha384", and "sha512".
        String hexSig = rsa.signStringENC(strData, "sha-1");

        System.out.println(hexSig);

        System.out.println("Success!");
    }
}