mirror of
https://github.com/morgan9e/noiseprotocol
synced 2026-04-14 00:14:05 +09:00
e84db3c232
* Created NoiseBackend class serving as a base for backends
* Refactored NoiseProtocol name parsing
* Refactored existing spec-defined functions into abstract classes.
Implementing classes are connecting crypto primitives to expected
interfaces.
* Refactored existing usage of Cryptography as source of crypto into
"default" backend (along with in-house implementation of X448).
* Provisioned "experimental" backend, it will contain e.g. non-default
crypto algorithms
* Backend can be chosen while creating NoiseConnection, though by
default, the Cryptography backend ("default") is used
Closes #7
43 lines
1.2 KiB
Python
43 lines
1.2 KiB
Python
import abc
|
|
|
|
|
|
class Hash(metaclass=abc.ABCMeta):
|
|
@property
|
|
@abc.abstractmethod
|
|
def fn(self):
|
|
raise NotImplementedError
|
|
|
|
@property
|
|
@abc.abstractmethod
|
|
def hashlen(self):
|
|
raise NotImplementedError
|
|
|
|
@property
|
|
@abc.abstractmethod
|
|
def blocklen(self):
|
|
raise NotImplementedError
|
|
|
|
@abc.abstractmethod
|
|
def hash(self, data):
|
|
raise NotImplementedError
|
|
|
|
|
|
def hkdf(chaining_key, input_key_material, num_outputs, hmac_hash_fn):
|
|
# Sets temp_key = HMAC-HASH(chaining_key, input_key_material).
|
|
temp_key = hmac_hash_fn(chaining_key, input_key_material)
|
|
|
|
# Sets output1 = HMAC-HASH(temp_key, byte(0x01)).
|
|
output1 = hmac_hash_fn(temp_key, b'\x01')
|
|
|
|
# Sets output2 = HMAC-HASH(temp_key, output1 || byte(0x02)).
|
|
output2 = hmac_hash_fn(temp_key, output1 + b'\x02')
|
|
|
|
# If num_outputs == 2 then returns the pair (output1, output2).
|
|
if num_outputs == 2:
|
|
return output1, output2
|
|
|
|
# Sets output3 = HMAC-HASH(temp_key, output2 || byte(0x03)).
|
|
output3 = hmac_hash_fn(temp_key, output2 + b'\x03')
|
|
|
|
# Returns the triple (output1, output2, output3).
|
|
return output1, output2, output3 |