def _post_decode_hook(self):
if self.asn1["parameters"] is None:
raise InvalidInputException(
"ECC private key does not contain curve OID. Cannot proceed.")
if self.asn1["publicKey"] is None:
raise InvalidInputException(
"ECC private key does not contain public key. Cannot proceed.")
curve_oid = OID.from_asn1(self.asn1["parameters"])
self._curve = CurveDB().instantiate(oid=curve_oid)
self._d = int.from_bytes(self.asn1["privateKey"], byteorder="big")
(self._x, self._y) = ECCTools.decode_enc_pubkey(
ASN1Tools.bitstring2bytes(self.asn1["publicKey"]))
def _post_decode_hook(self):
alg_oid = OID.from_asn1(self.asn1["algorithm"]["algorithm"])
self._pk_alg = PublicKeyAlgorithms.lookup("oid", alg_oid)
if self._pk_alg is None:
self._key_decoding_error = "Unable to determine public key algorithm for OID %s." % (
alg_oid)
return
if self._pk_alg not in self._HANDLERS_BY_PK_ALG:
self._key_decoding_error = "Unable to determine public key handler for public key algorithm %s." % (
self._pk_alg.name)
return
handler_class = self._HANDLERS_BY_PK_ALG[self._pk_alg]
key_data = ASN1Tools.bitstring2bytes(self.asn1["subjectPublicKey"])
self._key = handler_class.from_subject_pubkey_info(
self._pk_alg, self.asn1["algorithm"]["parameters"], key_data)
self._key_decoding_error = None
def signature(self):
signature = ASN1Tools.bitstring2bytes(self.asn1["signatureValue"])
return signature
def keyid(self, hashfnc="sha1"):
hashval = hashlib.new(hashfnc)
inner_key = ASN1Tools.bitstring2bytes(self.asn1["subjectPublicKey"])
hashval.update(inner_key)
return hashval.digest()