Dart

Duplicate Java Secure Token Creation

See more RSA Examples

Demonstrates how to duplicate some Java code that creates an RSA signature to create a base64 token. Dart

import 'package:chilkat/chilkat.dart';

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

  // This example duplicates the following Java code:

  // public X509Certificate2 cert = new X509Certificate2(@"Some path to p12/p12file_name.p12","Password_for_p12"); 
  // 
  // public string GenerateSignToken(double timeValidityMin){ 
  //   string equalsSign = ":="; 
  //   string timeCreated = DateTime.Now.ToString("yyyy-MM-ddTHH:mm:ss.fffzzz"); 
  //   string tokenTimeInfo = "validityTimeMinutes" + equalsSign + timeValidityMin + ";"+"timeCreated" + equalsSign + timeCreated; 
  //   string signature = SignData(tokenTimeInfo); 
  //   string secureToken = tokenTimeInfo + ";" + "signature" + equalsSign + signature; 
  //   return Base64UrlEncode(secureToken); 
  // } 
  //  
  // public string SignData(string stringToSign){ 
  //   byte[] dataToSign = Encoding.UTF8.GetBytes(stringToSign); 
  //   RSACryptoServiceProvider privKey = (RSACryptoServiceProvider)cert.PrivateKey; 
  //   CspKeyContainerInfo containerInfo = new RSACryptoServiceProvider().CspKeyContainerInfo; 
  //   CspParameters cspparams = new CspParameters(containerInfo.ProviderType, containerInfo.ProviderName, privKey.CspKeyContainerInfo.KeyContainerName); 
  //   privKey = new RSACryptoServiceProvider(cspparams); 
  //   string id = CryptoConfig.MapNameToOID("SHA256"); 
  //   byte[] sign = privKey.SignData(dataToSign, id); 
  //   bool res = privKey.VerifyData(dataToSign, id, sign); 
  //   return Convert.ToBase64String(sign).Replace('+', '-').Replace('/', '_').Replace("=", ""); 
  // } 
  //  
  // private static string Base64UrlEncode(string input){ 
  //   var inputBytes = Encoding.UTF8.GetBytes(input); 
  //   return Convert.ToBase64String(inputBytes).Replace('+', '-').Replace('/', '_').Replace("=", ""); 
  // } 

  final dt = CkDateTime();
  dt.setFromCurrentSystemTime();
  final timeCreated = dt.getAsTimestamp(true);

  // Such as 2019-04-01T19:35:44-05:00
  print(timeCreated);

  final sbToken = CkStringBuilder();
  sbToken.append('validityTimeMinutes:=10.0;timeCreated:=');
  sbToken.append(timeCreated);

  final cert = CkCert();
  try {
    cert.loadPfxFile('Some path to p12/p12file_name.p12', 'Password_for_p12');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final rsa = CkRsa();
  try {
    rsa.setX509Cert(cert, true);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  rsa.encodingMode = 'base64url';

  final String signature;
  try {
    signature = rsa.signStringENC(sbToken.getAsString(), 'sha256');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  sbToken.append(';signature:=');
  sbToken.append(signature);

  // Base64URL encode the result
  sbToken.encode('base64url', 'utf-8');
  final token = sbToken.getAsString();

  print(token);
}