(Android™) Create PKCS7 Signed File (.p7m)

Demonstrates how to sign a file to create a .p7m that contains both the file contents and the signature.

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.

    CkCrypt2 crypt = new CkCrypt2();

    CkCertStore certStore = new CkCertStore();

    // Load a PFX file into a certificate store object.
    boolean success = certStore.LoadPfxFile("myPfx.pfx","pfxPassword");
    if (success != true) {
        Log.i(TAG, certStore.lastErrorText());
        return;
        }

    // Get the certificate by subject common name.
    // This should be the cert within the PFX that also
    // has a private key (also stored within the PFX).
    CkCert cert = certStore.FindCertBySubjectCN("myCert");
    if (certStore.get_LastMethodSuccess() == false) {
        Log.i(TAG, certStore.lastErrorText());
        return;
        }

    // Tell the crypt object to use the certificate for signing:
    success = crypt.SetSigningCert(cert);

    // Sign a file, producing a .p7m as output.
    // The input file is unchanged, the test.p7m contains the 
    // contents of the input file and the signature.
    String inFile = "test.txt";
    String outFile = "testp7m";
    success = crypt.CreateP7M(inFile,outFile);
    if (success != true) {
        Log.i(TAG, crypt.lastErrorText());
        return;
        }

    Log.i(TAG, "Success!");

  }

  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."
  }
}