findCommonPublicKey function

PasskeyPublicKey findCommonPublicKey(
  1. List<PasskeyPublicKey> a,
  2. List<PasskeyPublicKey> b
)

Returns the single public key present in both candidate lists; throws if there isn't exactly one common key.

Implementation

PasskeyPublicKey findCommonPublicKey(
    List<PasskeyPublicKey> a, List<PasskeyPublicKey> b) {
  final matches = <PasskeyPublicKey>[];
  for (final x in a) {
    for (final y in b) {
      if (x.equals(y)) matches.add(x);
    }
  }
  if (matches.length != 1) {
    throw ArgumentError('No unique public key found');
  }
  return matches.first;
}