Dart

Load a Private Key from a JWK

Demonstrates the Chilkat PrivateKey.LoadJwk method, which loads a private key from JWK (JSON Web Key) JSON. The only argument is the JWK JSON string. Supported key types are RSA, EC, and Ed25519 (kty=OKP).

Background: JWK is the JSON key format used throughout modern web security — JWT signing, OAuth, OpenID Connect — so this loader is what you use to consume a key from a JWK Set or an identity provider. A private JWK includes the private parameters (d and, for RSA, the CRT values); a public-only JWK omits them. As JSON in the clear, a private JWK must be handled as sensitive material.

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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // Demonstrates the PrivateKey.LoadJwk method, which loads a private key from JWK (JSON Web Key)
  // JSON.  The only argument is the JWK JSON string.  Supported key types are RSA, EC, and
  // Ed25519 (kty=OKP).

  final privKey = CkPrivateKey();

  // A private JWK.  For a real key, "d" (and the other private parameters) would be present.
  final jwk = '{"kty":"EC","crv":"P-256","x":"...","y":"...","d":"..."}';

  try {
    privKey.loadJwk(jwk);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('Loaded a ${privKey.keyType} private key.');
}