Dart

Load ECC Private Key from JWK Format (JSON Web Key)

See more ECC Examples

Demonstrates how to load an ECC private key from JWK (JSON Web Key) format.

Note: This example requires Chilkat v9.5.0.66 or later.

Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // Note: This example requires Chilkat v9.5.0.66 or later.

  // First build a JWK sample to load..
  final json = CkJsonObject();
  json.updateString('kty', 'EC');
  json.updateString('crv', 'P-256');
  json.updateString('x', 'oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE');
  json.updateString('y', 'vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU');
  json.updateString('d', 'EbVzfPnZPxfAyxqEZV05laAoJAl-_6Xt2O4mOB611sM');

  // The JSON contains the following:
  // { 
  //   "kty": "EC",
  //   "crv": "P-256",
  //   "x": "oBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxE",
  //   "y": "vvQyxZkUjJQUPU_0bCy3Pj5qQdfu8jwEfqEeYGZ95CU",
  //   "d": "EbVzfPnZPxfAyxqEZV05laAoJAl-_6Xt2O4mOB611sM"
  // }

  // Note: The JSON can contain other members, such as "use", "kid", or anything else.  These will be ignored.
  json.emitCompact = false;

  // Show the JWK string to be loaded:
  final jwkStr = json.emit();

  final privKey = CkPrivateKey();
  try {
    privKey.loadJwk(jwkStr);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // OK.. the JWK is loaded.  It can be used in whatever way desired...

  // The key can be retrieved in any other format, such as XML or PEM..
  print(privKey.getXml());

  // XML output:
  // <ECCKeyValue curve="secp256r1">MHcCAQEEIBG1c3z52T8XwMsahGVdOZWgKCQJfv+l7djuJjgetdbDoAoGCCqGSM49AwEHoEQDQgAEoBUyo8CQAFPeYPvv78ylh5MwFZjTCLQeb042TjiMJxG+9DLFmRSMlBQ9T/RsLLc+PmpB1+7yPAR+oR5gZn3kJQ==</ECCKeyValue>

  print(privKey.getPkcs8EncryptedPem('secret'));

  // PEM output
  // 
  // -----BEGIN ENCRYPTED PRIVATE KEY-----
  // MIHFMEAGCSqGSIb3DQEFDTAzMBsGCSqGSIb3DQEFDDAOBAiku9rUjavLQQICCAAw
  // FAYIKoZIhvcNAwcECGsl/5nLai+JBIGAVIqKAdfcRQNLl1t3x+n8OZ92d1H+qgjS
  // Hs83wn2joJK4nlqy+rzosZxQ3e8NTJQyUEWZWcjqMj/N0phS3QWtcD/qbda5oEcv
  // QgtU60cZ4ql3truefAmlZz2PdpOfqtYhxlvjJQxnyojn4ntj69OwLOt9SZbaBQQi
  // KUL8KXT4Pq8=
  // -----END ENCRYPTED PRIVATE KEY-----
}