Dart

Export a Public Key as PEM

Demonstrates the Chilkat PublicKey.GetPem method, which returns the public key in PEM format. The only argument selects the underlying DER representation: true prefers the traditional PKCS #1 form (RSA), false uses the SubjectPublicKeyInfo form.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: PEM is the most portable way to share a public key — the Base64 text block most tooling reads. The boolean picks the encoding: false produces the modern, algorithm-independent PUBLIC KEY (SubjectPublicKeyInfo), which is the usual choice; true produces the older RSA-specific RSA PUBLIC KEY for tools that require it. A public key is not sensitive, so the PEM can be distributed openly.

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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // Load a public key to export.  LoadFromFile inspects the content, so it accepts DER, PEM, XML,
  // JWK, and other supported representations.
  final pubKey = CkPublicKey();
  try {
    pubKey.loadFromFile('qa_data/public.pem');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Export the public key in PEM format.  The argument selects the underlying DER representation:
  // true prefers the traditional PKCS #1 form (RSA), false uses the SubjectPublicKeyInfo form.
  final preferPkcs1 = false;
  final String pem;
  try {
    pem = pubKey.getPem(preferPkcs1);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print(pem);
}