Dart

Apple Keychain - Create RSA Signature

See more Apple Keychain Examples

Using an RSA private key stored in the Apple Keychain, create a signature by signing the SHA-256 hash of the provided string, then return the signature encoded in Base64 format.

Note: This example requires Chilkat v10.0.0 or greater.

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.

  final cert = CkCert();

  // On MacOS and iOS, the LoadByCommonName function will search the Apple Keychain for the matching certificate.

  // A digital certificate's Common Name (CN) is a field in the certificate that specifies the name of the entity the 
  // certificate is issued to. It is often used to identify the domain name, hostname, or organization the certificate represents. 

  // For example:
  // - In an SSL/TLS certificate for a website, the CN typically contains the domain name (e.g., "www.example.com").
  // - For certificates representing individuals or organizations, the CN might include the person's name or the organization's name.

  // The CN is part of the certificate's Subject field and is crucial for verifying that the certificate corresponds 
  // to the intended entity, especially in SSL/TLS communications.

  try {
    cert.loadByCommonName('Example, Inc.');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

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

  // Generate an RSA signature by signing the SHA-256 hash of the provided string, 
  // then return the signature encoded in Base64 format.
  rsa.encodingMode = 'base64';
  final String sigBase64;
  try {
    sigBase64 = rsa.signStringENC('to be signed', 'sha256');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('RSA Signature:');
  print(sigBase64);
}