(Android™) Duplicate OpensSSL to Sign File and Output Binary DER

This example duplicates the following:

openssl smime -sign -in INPUT.xml -signer SIGN.PEM -passin pass:MYPASS -outform der -binary -nodetach -out SIGNED.P7M

Note: Although "smime" is the OpenSSL command, it's not actually producing S/MIME. The arguments "-outform der -binary" indicates that the output is binary DER (i.e. the PKCS7 binary signature). The input can be any type of file: XML, PDF, JPG, ... *anything*...

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();

    // Load the PEM containing cert + private key.
    CkPem pem = new CkPem();
    boolean success = pem.LoadPemFile("qa_data/pem/myPem.pem","password");
    if (success != true) {
        Log.i(TAG, pem.lastErrorText());
        return;
        }

    CkPrivateKey privkey = pem.GetPrivateKey(0);
    if (pem.get_LastMethodSuccess() != true) {
        Log.i(TAG, pem.lastErrorText());
        return;
        }

    CkCert cert = pem.GetCert(0);
    if (pem.get_LastMethodSuccess() != true) {

        Log.i(TAG, pem.lastErrorText());
        return;
        }

    success = crypt.SetSigningCert2(cert,privkey);
    if (success != true) {

        Log.i(TAG, crypt.lastErrorText());
        return;
        }

    // Alternatively, we could use a .pfx/.p12 file.
    // (Chilkat also supports other formats/sources for cert/private keys...)
    CkCert certFromP12 = new CkCert();
    success = certFromP12.LoadPfxFile("qa_data/p12/myP12.p12","password");
    if (success != true) {
        Log.i(TAG, certFromP12.lastErrorText());
        return;
        }

    // The certificate, when loaded from a .pfx/.p12, will automatically 
    // include the associated private key, assuming it's present in the .p12.
    // We don't have to explicitly provide the private key as in the
    // lines of code above that use the PEM file.
    success = crypt.SetSigningCert(certFromP12);
    if (success != true) {
        Log.i(TAG, crypt.lastErrorText());
        return;
        }

    // Create the opaque signature (PKCS7 binary DER that contains both the signature and original file data).
    success = crypt.CreateP7M("qa_data/infile.anything","qa_output/outfile.p7m");
    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."
  }
}