PyBitmessage-2021-04-27/src/pyelliptic/hash.py
Peter Surda 2e0f7755c6
Blind signature support in pyelliptic
- add blind signature functionality to pyelliptic as described in #1409
- add tests for blind signatures
- PEP8 fixes for pyelliptic
- some minor refactoring is necessary for further integration, this is just a
  minimal implementation to pass a test
2019-08-27 23:13:45 +02:00

70 lines
1.7 KiB
Python

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright (C) 2011 Yann GUIBET <yannguibet@gmail.com>
# See LICENSE for details.
from openssl import OpenSSL
# For python3
def _equals_bytes(a, b):
if len(a) != len(b):
return False
result = 0
for x, y in zip(a, b):
result |= x ^ y
return result == 0
def _equals_str(a, b):
if len(a) != len(b):
return False
result = 0
for x, y in zip(a, b):
result |= ord(x) ^ ord(y)
return result == 0
def equals(a, b):
if isinstance(a, str):
return _equals_str(a, b)
else:
return _equals_bytes(a, b)
def hmac_sha256(k, m):
"""
Compute the key and the message with HMAC SHA5256
"""
key = OpenSSL.malloc(k, len(k))
d = OpenSSL.malloc(m, len(m))
md = OpenSSL.malloc(0, 32)
i = OpenSSL.pointer(OpenSSL.c_int(0))
OpenSSL.HMAC(OpenSSL.EVP_sha256(), key, len(k), d, len(m), md, i)
return md.raw
def hmac_sha512(k, m):
"""
Compute the key and the message with HMAC SHA512
"""
key = OpenSSL.malloc(k, len(k))
d = OpenSSL.malloc(m, len(m))
md = OpenSSL.malloc(0, 64)
i = OpenSSL.pointer(OpenSSL.c_int(0))
OpenSSL.HMAC(OpenSSL.EVP_sha512(), key, len(k), d, len(m), md, i)
return md.raw
def pbkdf2(password, salt=None, i=10000, keylen=64):
if salt is None:
salt = OpenSSL.rand(8)
p_password = OpenSSL.malloc(password, len(password))
p_salt = OpenSSL.malloc(salt, len(salt))
output = OpenSSL.malloc(0, keylen)
OpenSSL.PKCS5_PBKDF2_HMAC(p_password, len(password), p_salt,
len(p_salt), i, OpenSSL.EVP_sha256(),
keylen, output)
return salt, output.raw