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Splitting on the other end of the wire works!

pull/120/head
jMyles 2017-11-18 14:33:54 -08:00
parent a39146cac9
commit c0920b709d
1 changed files with 10 additions and 8 deletions
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18
nkms/policy/models.py
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@ -1,16 +1,17 @@
import msgpack
from npre.constants import UNKNOWN_KFRAG
from nkms.characters import Alice, Bob, Ursula
from nkms.crypto import api
from nkms.crypto.api import keccak_digest
from nkms.crypto.constants import HASH_DIGEST_LENGTH, PUBKEY_SIG_LENGTH
from nkms.crypto.constants import HASH_DIGEST_LENGTH
from nkms.crypto.powers import EncryptingPower, SigningPower
from nkms.crypto.signature import Signature
from nkms.crypto.utils import BytestringSplitter
from nkms.keystore.keypairs import Keypair
from nkms.keystore.keypairs import Keypair, PublicKey
from npre.constants import UNKNOWN_KFRAG
policy_payload_splitter = BytestringSplitter((bytes, HASH_DIGEST_LENGTH), (bytes, PUBKEY_SIG_LENGTH))
group_payload_splitter = BytestringSplitter((bytes, HASH_DIGEST_LENGTH), PublicKey)
policy_payload_splitter = BytestringSplitter((bytes, 66)) # TODO: I wish ReKeyFrag worked with this interface.
class PolicyOffer(object):
@ -209,12 +210,13 @@ class Policy(object):
@staticmethod
def from_ursula(group_payload, ursula):
hrac, alice_pubkey_sig, (payload_encrypted_for_ursula, sig_bytes) = policy_payload_splitter(group_payload, msgpack_remainder=True)
hrac, alice_pubkey_sig, (payload_encrypted_for_ursula, sig_bytes) = group_payload_splitter(group_payload,
msgpack_remainder=True)
alice = Alice(is_me=False, crypto_power_ups=[SigningPower(keypair=Keypair.deserialize_key(alice_pubkey_sig))])
ursula.learn_about_actor(alice)
verified = ursula.verify_from(alice, Signature(sig_bytes), payload_encrypted_for_ursula)
encrypted_treasure_map, signature = None
verified, policy_payload = ursula.verify_from(alice, Signature(sig_bytes), payload_encrypted_for_ursula,
decrypt=True, signature_is_on_cleartext=True)
kfrag, encrypted_treasure_map = policy_payload_splitter(policy_payload, return_remainder=True)
def payload(self):
return bytes(self.kfrag) + msgpack.dumps(self.encrypted_treasure_map())