Dart Requires Chilkat v11.0.0+

Create PKCS1 RSA Signature with PEM Private Key

See more RSA Examples

Demonstrates how to load a private key from a PEM file and create a PKCS1 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:
  try {
    pkey.loadPemFile('pvkey2_rsa.pem');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final rsa = CkRsa();

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

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

  print(hexSig);

  print('Success!');
}