Chilkat Examples

ChilkatHOMEAndroid™Classic ASPCC++C#Mono C#.NET Core C#C# UWP/WinRTDataFlexDelphi ActiveXDelphi DLLVisual FoxProJavaLianjaMFCObjective-CPerlPHP ActiveXPHP ExtensionPowerBuilderPowerShellPureBasicPythonRubySQL ServerSwiftTclUnicode CUnicode C++Visual Basic 6.0VB.NETVB.NET UWP/WinRTVBScriptXojo PluginNode.jsExcel

Android™ Examples

Async
Certificates
ECC
Email Object
Encryption
FTP
HTML-to-XML/Text
Gzip
HTTP
IMAP
JSON
Jwt
MHT / HTML Email
PEM
PFX/P12
Java KeyStore (JKS)
OAuth2
POP3
RSA Encryption
MIME
REST
SCP
SMTP
Socket/SSL/TLS
SSH Key
SSH
SSH Tunnel
SFTP
Stream
Tar Archive
XML
XMP
Zip

More Examples...
OpenSSL
Google APIs
Google Cloud Storage
Azure Cloud Storage
Amazon S3 (new)
Google Drive
Dropbox
Firebase
ASN.1
PRNG
Amazon S3
Bounced Email
CSV
Diffie-Hellman
DKIM / DomainKey
DSA
NTLM
QuickBooks
Spider
Digital Signatures

 

 

 

 

 

 

 

(Android™) RSA Encrypt and Decrypt Strings

Android™ sample code to RSA public-key encrypt and decrypt strings using public and private keys.

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);

    CkRsa rsa = new CkRsa();

    boolean success = rsa.UnlockComponent("Anything for 30-day trial");
    if (success != true) {
        Log.i(TAG, "RSA component unlock failed");
        return;
    }

    //  This example also generates the public and private
    //  keys to be used in the RSA encryption.
    //  Normally, you would generate a key pair once,
    //  and distribute the public key to your partner.
    //  Anything encrypted with the public key can be
    //  decrypted with the private key.  The reverse is
    //  also true: anything encrypted using the private
    //  key can be decrypted using the public key.

    //  Generate a 1024-bit key.  Chilkat RSA supports
    //  key sizes ranging from 512 bits to 4096 bits.
    success = rsa.GenerateKey(1024);
    if (success != true) {
        Log.i(TAG, rsa.lastErrorText());
        return;
    }

    //  Keys are exported in XML format:
    String publicKey = rsa.exportPublicKey();
    String privateKey = rsa.exportPrivateKey();

    String plainText = "Encrypting and decrypting should be easy!";

    //  Start with a new RSA object to demonstrate that all we
    //  need are the keys previously exported:
    CkRsa rsaEncryptor = new CkRsa();

    //  Encrypted output is always binary.  In this case, we want
    //  to encode the encrypted bytes in a printable string.
    //  Our choices are "hex", "base64", "url", "quoted-printable".
    rsaEncryptor.put_EncodingMode("hex");

    //  We'll encrypt with the public key and decrypt with the private
    //  key.  It's also possible to do the reverse.
    success = rsaEncryptor.ImportPublicKey(publicKey);

    boolean usePrivateKey = false;
    String encryptedStr = rsaEncryptor.encryptStringENC(plainText,usePrivateKey);
    Log.i(TAG, encryptedStr);

    //  Now decrypt:
    CkRsa rsaDecryptor = new CkRsa();

    rsaDecryptor.put_EncodingMode("hex");
    success = rsaDecryptor.ImportPrivateKey(privateKey);

    usePrivateKey = true;
    String decryptedStr = rsaDecryptor.decryptStringENC(encryptedStr,usePrivateKey);

    Log.i(TAG, decryptedStr);

  }

  static {
      // Important: Make sure the name passed to loadLibrary matches the shared library
      // found in your project's libs/armeabi directory.
      //  for "libchilkat.so", pass "chilkat" to loadLibrary
      //  for "libchilkatemail.so", pass "chilkatemail" to loadLibrary
      //  etc.
      // 
      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."
  }
}

 

© 2000-2016 Chilkat Software, Inc. All Rights Reserved.