createSignature method

String createSignature(String authId, String helloNonce, Extra extra, HashMap<String, Object?> authExtra,)

Synchronous compatibility helper. Argon2id13 deliberately throws on web.

Implementation

String createSignature(
  String authId,
  String helloNonce,
  Extra extra,
  HashMap<String, Object?> authExtra,
) {
  _ensureUsable();
  _validateChallenge(extra);
  final fingerprint = _fingerprint(authId, extra);
  if (_keyFingerprint != null && _keyFingerprint != fingerprint) {
    if (_secret == null) {
      throw StateError('Cached SCRAM key does not match this challenge');
    }
    _clearKeys();
  }
  if (_clientKey == null) {
    final secret = _secret;
    if (secret == null) throw StateError('SCRAM secret is unavailable');
    final saltedPassword = deriveSaltedPassword(
      secret: secret,
      salt: extra.salt!,
      kdf: extra.kdf!,
      iterations: extra.iterations!,
      memory: extra.memory,
      stringEncoding: stringEncoding,
    );
    _installKeys(saltedPassword, fingerprint);
    _clear(saltedPassword);
  } else {
    _keyFingerprint ??= fingerprint;
  }
  return _buildProofAndVerifier(authId, helloNonce, authExtra, extra);
}