findCommonPublicKey function

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

Returns the single public key present in both lists, throwing if there is not exactly one. Used with two PasskeyKeypair.signAndRecover results.

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;
}