(Android™) Decrypt a .p7m File (using a PFX)

Android™ sample code showing how to decrypt a .p7m using a .p12 / .pfx certificate w/ private key.

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();

    // Use a digital certificate and private key from a PFX file (.pfx or .p12).
    String pfxPath = "myCertAndKey.pfx";
    String pfxPassword = "test123";

    boolean success = crypt.AddPfxSourceFile(pfxPath,pfxPassword);
    if (success != true) {
        Log.i(TAG, crypt.lastErrorText());
        return;
        }

    // Set the  outPath to whatever is appropriate.
    // If you are decrypting a PDF, your output might be "out.pdf"...
    String inPath = "smime.p7m";
    String outPath = "original.txt";

    // Indicate that we're doing public key decryption (i.e. PKCS7)
    crypt.put_CryptAlgorithm("pki");

    success = crypt.CkDecryptFile(inPath,outPath);
    if (success == false) {
        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."
  }
}