Dart Requires Chilkat v11.0.0+

Duplicate PHP RSA Encryption

See more RSA Examples

Demonstrates how to duplicate the following PHP function. Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // This example requires the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  // Duplicate the following PHP code:
  // 
  //    public function encryptRSA($plainText,$rsaMOD,$pubKEY){
  //         $rsa  = new RSA();
  //         $rsa->setEncryptionMode(RSA::ENCRYPTION_PKCS1);
  //         $publicKey = [
  //             'e' => new BigInteger($pubKEY,16),
  //             'n' => new BigInteger($rsaMOD,16)
  //         ];
  // 		
  //         $rsa->loadKey($publicKey);
  //         $ciphertext = $rsa->encrypt($plainText);
  //         return bin2hex($ciphertext);
  //     }
  // 
  //     $plainText="key=abcdefghijkmnopq&iv=abcdefghijkmnopq&h=12345678&s=12345678"
  //     $rsaMOD="F0946D8F05604809E24B8CFFD30349CEA9E5F4D320BFD9E9AA1B088863F02C43E7997D37A3E27B4F8F359F1744DB6B20A437067C0D325A80660D12FF56A57673"
  //     $pubKEY="010001"

  // We have the RSA modulus in hex
  final rsaMOD = 'F0946D8F05604809E24B8CFFD30349CEA9E5F4D320BFD9E9AA1B088863F02C43E7997D37A3E27B4F8F359F1744DB6B20A437067C0D325A80660D12FF56A57673';

  // The RSA exponent in hex is "010001", which is 65537 in decimal.  It's typically the exponent that is always used.
  final rsaEXP = '010001';

  // Get the RSA modulus and exponent in base64.
  final bdMod = CkBinData();
  final bdExp = CkBinData();
  bdMod.appendEncoded(rsaMOD, 'hex');
  bdExp.appendEncoded(rsaEXP, 'hex');

  // Build the XML representation of the RSA public key
  final xml = CkXml();
  xml.tag = 'RSAPublicKey';
  xml.updateChildContent('Modulus', bdMod.getEncoded('base64'));
  xml.updateChildContent('Exponent', bdExp.getEncoded('base64'));

  // Load the RSA public key into a Chilkat public key object.
  final pubkey = CkPublicKey();
  pubkey.loadFromString(xml.getXml());

  // Setup the RSA object for encryption and do it..
  final rsa = CkRsa();
  rsa.verboseLogging = true;
  rsa.usePublicKey(pubkey);

  // Use PKCSv1.5 padding
  rsa.pkcsPadding = true;

  // Encrypt and return the string as hex.
  rsa.encodingMode = 'hex';
  final plainText = 'key=abcdefghijkmnopq&iv=abcdefghijkmnopq&h=12345678&s=12345678';
  final String cipherText;
  try {
    cipherText = rsa.encryptStringENC(plainText, false);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Note: The PKCSv1_5 padding incorporates random bytes.  Therefore, the RSA encryption will produce different results each time -- all of which are valid 
  // and decrypt correctly to the same original text.
  print(cipherText);
}