(Android™) RSASSA-PSS Algorithm with SHA256 Hashing

RSA encrypt a SHA256 hash with OAEP padding.

Chilkat Android™ Downloads Android™ Java Libraries Android C/C++ Libraries

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkPrivateKey privkey = new CkPrivateKey();

    // Load the private key object from a PEM file.
    // (To load from a PEM string, call LoadPem instead.)
    boolean success = privkey.LoadPemFile("somePath/myPrivateKey.pem");
    if (success != true) {
        Log.i(TAG, privkey.lastErrorText());
        return;
        }

    CkRsa rsa = new CkRsa();
    // Use RSA-PSS by setting OaepPadding = true
    rsa.put_OaepPadding(true);
    // Use SHA256
    rsa.put_OaepHash("SHA-256");

    rsa.ImportPrivateKeyObj(privkey);

    // Generate a base64 signature.
    rsa.put_EncodingMode("base64");

    String sigStr = rsa.signStringENC("String to be signed","SHA-256");
    if (rsa.get_LastMethodSuccess() != true) {
        Log.i(TAG, rsa.lastErrorText());
        return;
        }

    Log.i(TAG, "Signature: " + sigStr);

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}