Dart Requires Chilkat v11.0.0+

RSA Sign Using Private Key from .pfx/.p12 to Base64 Signature

See more RSA Examples

Demonstrates how to RSA sign something using a private key loaded from a .pfx/.p12. The RSA signature is returned in Base64 encoded format. 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();

  // Load the .pfx/.p12
  final pfx = CkPfx();
  try {
    pfx.loadPfxFile('qa_data/pfx/myKey.p12', 'myPassword');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Get the default private key.

  final privKey = CkPrivateKey();
  try {
    pfx.privateKeyAt(0, privKey);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Import the private key into the RSA component:
  try {
    rsa.usePrivateKey(privKey);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Get the signature in base64
  rsa.encodingMode = 'base64';

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

  // Sign the string using the sha256 hash algorithm.
  // Other valid choices are "sha384", "sha512", "sha-1", "md2" and "md5".
  final base64Sig = rsa.signStringENC(strData, 'sha256');

  print(base64Sig);

  print('Success!');
}