def authenticate_multi(self,
msg: Dict,
signatures: Dict[str, str],
threshold: Optional[int] = None,
verifier: Verifier = DidVerifier):
num_sigs = len(signatures)
if threshold is not None:
if num_sigs < threshold:
raise InsufficientSignatures(num_sigs, threshold)
else:
threshold = num_sigs
correct_sigs_from = []
incorrect_signatures = {}
for idr, sig in signatures.items():
try:
sig_decoded = base58.b58decode(sig)
except Exception as ex:
raise InvalidSignatureFormat from ex
ser = self.serializeForSig(msg, identifier=idr)
verkey = self.getVerkey(idr, msg)
if verkey is None:
raise CouldNotAuthenticate(idr)
vr = verifier(verkey, identifier=idr)
if vr.verify(sig_decoded, ser):
correct_sigs_from.append(idr)
if len(correct_sigs_from) == threshold:
break
else:
incorrect_signatures[idr] = sig
else:
raise InsufficientCorrectSignatures(threshold,
len(correct_sigs_from),
incorrect_signatures)
return correct_sigs_from