Dart Requires Chilkat v11.0.0+

RSA Sign with PKCS8 Encrypted Key

See more RSA Examples

Demonstrates how to load a private key from an encrypted PKCS8 file and create an RSA digital signature. 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 pkey = CkPrivateKey();

  // Load the private key from an RSA PEM file:
  pkey.loadPkcs8EncryptedFile('privateKey.key', 'myPassword');

  final rsa = CkRsa();

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

  // Return the signature in hex
  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 "md2", "sha256", "sha384", "sha512",  and "md5".
  final hexSig = rsa.signStringENC(strData, 'sha-1');

  print(hexSig);
}