def reencrypt_via_rest(id_as_hex):
from nucypher.policy.models import WorkOrder # Avoid circular import
arrangement_id = binascii.unhexlify(id_as_hex)
work_order = WorkOrder.from_rest_payload(arrangement_id, request.data)
log.info("Work Order from {}, signed {}".format(work_order.bob, work_order.receipt_signature))
with ThreadedSession(db_engine) as session:
policy_arrangement = datastore.get_policy_arrangement(arrangement_id=id_as_hex.encode(),
session=session)
kfrag_bytes = policy_arrangement.kfrag # Careful! :-)
verifying_key_bytes = policy_arrangement.alice_pubkey_sig.key_data
# TODO: Push this to a lower level.
kfrag = KFrag.from_bytes(kfrag_bytes)
alices_verifying_key = UmbralPublicKey.from_bytes(verifying_key_bytes)
cfrag_byte_stream = b""
for capsule, capsule_signature in zip(work_order.capsules, work_order.capsule_signatures):
# This is the capsule signed by Bob
capsule_signature = bytes(capsule_signature)
# Ursula signs on top of it. Now both are committed to the same capsule.
capsule_signed_by_both = bytes(stamp(capsule_signature))
capsule.set_correctness_keys(verifying=alices_verifying_key)
cfrag = pre.reencrypt(kfrag, capsule, metadata=capsule_signed_by_both)
log.info("Re-encrypting for {}, made {}.".format(capsule, cfrag))
signature = stamp(bytes(cfrag) + bytes(capsule))
cfrag_byte_stream += VariableLengthBytestring(cfrag) + signature
# TODO: Put this in Ursula's datastore
work_order_tracker.append(work_order)
headers = {'Content-Type': 'application/octet-stream'}
return Response(response=cfrag_byte_stream, headers=headers)
def reencrypt_via_rest(self, id_as_hex, request: http.Request):
from nucypher.policy.models import WorkOrder # Avoid circular import
id = binascii.unhexlify(id_as_hex)
work_order = WorkOrder.from_rest_payload(id, request.body)
self.log.info("Work Order from {}, signed {}".format(
work_order.bob, work_order.receipt_signature))
with ThreadedSession(self.db_engine) as session:
kfrag_bytes = self.datastore.get_policy_arrangement(
id.hex().encode(), session=session).k_frag # Careful! :-)
# TODO: Push this to a lower level.
kfrag = KFrag.from_bytes(kfrag_bytes)
cfrag_byte_stream = b""
for capsule in work_order.capsules:
# TODO: Sign the result of this. See #141.
cfrag = pre.reencrypt(kfrag, capsule)
self.log.info(
"Re-encrypting for Capsule {}, made CFrag {}.".format(
capsule, cfrag))
cfrag_byte_stream += VariableLengthBytestring(cfrag)
# TODO: Put this in Ursula's datastore
self._work_orders.append(work_order)
headers = {'Content-Type': 'application/octet-stream'}
return Response(content=cfrag_byte_stream, headers=headers)
def reencrypt_via_rest(id_as_hex):
from nucypher.policy.models import WorkOrder # Avoid circular import
arrangement_id = binascii.unhexlify(id_as_hex)
work_order = WorkOrder.from_rest_payload(arrangement_id, request.data)
log.info("Work Order from {}, signed {}".format(
work_order.bob, work_order.receipt_signature))
with ThreadedSession(db_engine) as session:
policy_arrangement = datastore.get_policy_arrangement(
arrangement_id=id_as_hex.encode(), session=session)
kfrag_bytes = policy_arrangement.kfrag # Careful! :-)
verifying_key_bytes = policy_arrangement.alice_pubkey_sig.key_data
# TODO: Push this to a lower level. Perhaps to Ursula character? #619
kfrag = KFrag.from_bytes(kfrag_bytes)
alices_verifying_key = UmbralPublicKey.from_bytes(verifying_key_bytes)
cfrag_byte_stream = b""
alices_address = canonical_address_from_umbral_key(
alices_verifying_key)
if not alices_address == work_order.alice_address:
message = f"This Bob ({work_order.bob}) sent an Alice's ETH address " \
f"({work_order.alice_address}) that doesn't match " \
f"the one I have ({alices_address})."
raise SuspiciousActivity(message)
bob_pubkey = work_order.bob.stamp.as_umbral_pubkey()
if not work_order.alice_address_signature.verify(
message=alices_address, verifying_key=bob_pubkey):
message = f"This Bob ({work_order.bob}) sent an invalid signature of Alice's ETH address"
raise InvalidSignature(message)
# This is Bob's signature of Alice's verifying key as ETH address.
alice_address_signature = bytes(work_order.alice_address_signature)
for capsule, capsule_signature in zip(work_order.capsules,
work_order.capsule_signatures):
# This is the capsule signed by Bob
capsule_signature = bytes(capsule_signature)
# Ursula signs on top of it. Now both are committed to the same capsule.
# She signs Alice's address too.
ursula_signature = stamp(capsule_signature +
alice_address_signature)
capsule.set_correctness_keys(verifying=alices_verifying_key)
cfrag = pre.reencrypt(kfrag,
capsule,
metadata=bytes(ursula_signature))
log.info(f"Re-encrypting for {capsule}, made {cfrag}.")
signature = stamp(bytes(cfrag) + bytes(capsule))
cfrag_byte_stream += VariableLengthBytestring(cfrag) + signature
# TODO: Put this in Ursula's datastore
work_order_tracker.append(work_order)
headers = {'Content-Type': 'application/octet-stream'}
return Response(response=cfrag_byte_stream, headers=headers)
def reencrypt_via_rest(id_as_hex):
# TODO: How to pass Ursula's identity evidence to Bob? #962
# 'Identity evidence' is a signature of her stamp with the checksum address
from nucypher.policy.models import WorkOrder # Avoid circular import
arrangement_id = binascii.unhexlify(id_as_hex)
with ThreadedSession(db_engine) as session:
policy_arrangement = datastore.get_policy_arrangement(
arrangement_id=id_as_hex.encode(), session=session)
kfrag_bytes = policy_arrangement.kfrag # Careful! :-)
verifying_key_bytes = policy_arrangement.alice_pubkey_sig.key_data
# TODO: Push this to a lower level. Perhaps to Ursula character? #619
kfrag = KFrag.from_bytes(kfrag_bytes)
alices_verifying_key = UmbralPublicKey.from_bytes(verifying_key_bytes)
alices_address = canonical_address_from_umbral_key(
alices_verifying_key)
work_order = WorkOrder.from_rest_payload(arrangement_id=arrangement_id,
rest_payload=request.data,
ursula_pubkey_bytes=bytes(
this_node.stamp),
alice_address=alices_address)
log.info(
f"Work Order from {work_order.bob}, signed {work_order.receipt_signature}"
)
cfrag_byte_stream = b""
for task in work_order.tasks:
# Ursula signs on top of Bob's signature of each task.
# Now both are committed to the same task. See #259.
reencryption_metadata = bytes(
this_node.stamp(bytes(task.signature)))
capsule = task.capsule
capsule.set_correctness_keys(verifying=alices_verifying_key)
cfrag = pre.reencrypt(kfrag,
capsule,
metadata=reencryption_metadata)
log.info(f"Re-encrypting for {capsule}, made {cfrag}.")
# Finally, Ursula commits to her result
reencryption_signature = this_node.stamp(bytes(cfrag))
cfrag_byte_stream += VariableLengthBytestring(
cfrag) + reencryption_signature
# TODO: Put this in Ursula's datastore
this_node._work_orders.append(work_order)
headers = {'Content-Type': 'application/octet-stream'}
return Response(response=cfrag_byte_stream, headers=headers)
def reencrypt_via_rest(self, hrac_as_hex, request: http.Request):
from nucypher.policy.models import WorkOrder # Avoid circular import
hrac = binascii.unhexlify(hrac_as_hex)
work_order = WorkOrder.from_rest_payload(hrac, request.body)
with ThreadedSession(self.db_engine) as session:
kfrag_bytes = self.datastore.get_policy_arrangement(
hrac.hex().encode(), session=session).k_frag # Careful! :-)
# TODO: Push this to a lower level.
kfrag = KFrag.from_bytes(kfrag_bytes)
cfrag_byte_stream = b""
for capsule in work_order.capsules:
# TODO: Sign the result of this. See #141.
cfrag_byte_stream += VariableLengthBytestring(
pre.reencrypt(kfrag, capsule))
# TODO: Put this in Ursula's datastore
self._work_orders.append(work_order)
headers = {'Content-Type': 'application/octet-stream'}
return Response(content=cfrag_byte_stream, headers=headers)