Dart Requires Chilkat v11.0.0+

RSA Encrypt and Decrypt Credit Card Numbers

See more RSA Examples

_LANGUAGE_ sample code to RSA public-key encrypt and decrypt credit card numbers. The RSA key is loaded from an unencrypted PKCS8 file. Chilkat provides many ways of setting the key -- loading from both encrypted and unencrypted PEM, PKCS8, DER, PVK, etc. Keys may be loaded from files or in-memory representations. (The RSA component also provides the ability to generate RSA keys.) Dart

import 'package:chilkat/chilkat.dart';

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

  final rsa = CkRsa();

  final privKey = CkPrivateKey();

  // Load an RSA private key from a file:
  try {
    privKey.loadAnyFormatFile('rsaPrivateKey.key', '');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Get the public part of the private key.
  final pubKey = CkPublicKey();
  privKey.toPublicKey(pubKey);

  try {
    rsa.usePublicKey(pubKey);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Encrypt a VISA credit card number:
  // 1234-5678-0000-9999
  final ccNumber = '1234567800009999';

  var usePrivateKey = false;
  rsa.encodingMode = 'base64';
  final encryptedStr = rsa.encryptStringENC(ccNumber, usePrivateKey);
  print('Encrypted:');
  print(encryptedStr);

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

  rsaDecryptor.encodingMode = 'base64';
  rsaDecryptor.usePrivateKey(privKey);

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

  print('Decrypted:');
  print(decryptedStr);

  // Important: RSA encryption should only be used to encrypt small amounts of data.
  // It is typically used for encrypting symmetric encryption
  // keys such that a symmetric encryption algorithm, such as 
  // AES is then used to encrypt/decrypt bulk data.
}