(Android™) Duplicate openssl smime -decrypt -in some_file.dat.enc -binary -inform DER -inkey private.key -out some_file.dat

Demonstrates how to decrypt binary DER that was encrypted using the following openssl command:

openssl smime -encrypt -binary -aes-256-cbc -in some_file.dat -out some_file.dat.enc -outform DER cert.crt

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.

    // Duplicates the following openssl command:
    // openssl smime -decrypt -in hello.txt.enc -binary -inform DER -inkey private.key -out hello.txt

    CkCert cert = new CkCert();
    boolean success = cert.LoadFromFile("qa_data/openssl/EE.cer");
    if (success == false) {
        Log.i(TAG, cert.lastErrorText());
        return;
        }

    CkBinData bd = new CkBinData();
    success = bd.LoadFile("qa_data/openssl/EE.key");
    // Assuming success..

    CkPrivateKey privKey = new CkPrivateKey();
    success = privKey.LoadAnyFormat(bd,"");
    if (success == false) {
        Log.i(TAG, privKey.lastErrorText());
        return;
        }

    CkCrypt2 crypt = new CkCrypt2();
    success = crypt.SetDecryptCert2(cert,privKey);
    if (success == false) {
        Log.i(TAG, crypt.lastErrorText());
        return;
        }

    crypt.put_CryptAlgorithm("PKI");
    success = crypt.CkDecryptFile("qa_data/openssl/hello.txt.enc","qa_output/hello.txt");
    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."
  }
}