Dart Requires Chilkat v11.0.0+

RSA Signature with Certificate's Private Key from PFX

See more RSA Examples

Demonstrates how to use a certificate's private key from a PFX file to create an RSA signature. 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.

  // Create an instance of a certificate store object, load a PFX file,
  // locate the certificate we need, and use it for signing.
  // (a PFX file may contain more than one certificate.)
  final certStore = CkCertStore();

  // The 1st argument is the filename, the 2nd arg is the 
  // PFX file's password:
  try {
    certStore.loadPfxFile('chilkat.pfx', 'test');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Find the certificate by the subject common name:
  final jsonCN = CkJsonObject();
  jsonCN.updateString('CN', 'cert common name');

  final cert = CkCert();
  try {
    certStore.findCert(jsonCN, cert);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final privKey = CkPrivateKey();
  try {
    cert.getPrivateKey(privKey);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final rsa = CkRsa();

  try {
    rsa.usePrivateKey(privKey);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Encode the signature as a hex string
  rsa.encodingMode = 'hex';

  final strData = 'This is the string to be signed.';

  // Sign the string using the sha-1 hash algorithm.
  // Other valid choices are "sha-256", "md2" and "md5".
  final hexSig = rsa.signStringENC(strData, 'sha-1');

  print(hexSig);

  print('Success!');
}