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(Java) RSA Signature/Verify with .key and .cer

See more RSA Examples

Demonstrates how to use a .key file (private key) and digital certificate (.cer, public key) to create and verify an RSA signature.

Chilkat Java Downloads

Java Libs for Windows, MacOS, Linux, Alpine Linux, Solaris

Java Libs for Android

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

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

    CkPrivateKey privKey = new CkPrivateKey();

    // Load the private key from an RSA .key file:
    boolean success = privKey.LoadPemFile("privateKey.key");
    if (success != true) {
        System.out.println(privKey.lastErrorText());
        return;
        }

    String privKeyXml;
    // Get the private key in XML format:
    privKeyXml = privKey.getXml();

    CkRsa rsa = new CkRsa();

    // Import the private key into the RSA component:
    success = rsa.ImportPrivateKey(privKeyXml);
    if (success != true) {
        System.out.println(rsa.lastErrorText());
        return;
        }

    // Create the signature as a hex string:
    rsa.put_EncodingMode("hex");

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

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

    System.out.println(hexSig);

    // Load a digital certificate from a .cer file:
    CkCert cert = new CkCert();

    success = cert.LoadFromFile("myCert.cer");
    if (success != true) {
        System.out.println(cert.lastErrorText());
        return;
        }

    CkPublicKey pubKey;

    pubKey = cert.ExportPublicKey();

    // Now verify using a separate instance of the RSA object:
    CkRsa rsa2 = new CkRsa();

    // Import the public key into the RSA object:
    success = rsa2.ImportPublicKey(pubKey.getXml());
    if (success != true) {
        System.out.println(rsa2.lastErrorText());
        return;
        }

    // The signature is a hex string, so make sure the EncodingMode is correct:
    rsa2.put_EncodingMode("hex");

    // Verify the signature:
    success = rsa2.VerifyStringENC(strData,"sha-1",hexSig);
    if (success != true) {
        System.out.println(rsa2.lastErrorText());
        return;
        }

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

 

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