bestKeyFor method

PackageKey? bestKeyFor(List<String> supportedAlgos, { String use = SecretSharingAlgos.useEnc, })

The first active key in supportedAlgos order (strongest first) that this key package advertises for use. Returns null if the package and supportedAlgos have no algorithm in common, or if every key they do have in common is retired.

A holder deciding whether it can open a given envelope asks keys instead, which carries retired entries too.

Implementation

PackageKey? bestKeyFor(List<String> supportedAlgos,
    {String use = SecretSharingAlgos.useEnc}) {
  for (final alg in supportedAlgos) {
    for (final key in keys) {
      if (key.alg == alg && key.use == use && key.offeredForNewOperations) {
        return key;
      }
    }
  }
  return null;
}