nacl and bbs98

nkms/crypto/__init__.py

@@ -0,0 +1,30 @@
+import base64
+import importlib
+from nacl.utils import random  # noqa
+
+# hashMerkleRoot for Bitcoin genesis block
+_bitcoin_genesis = base64.encodebytes(bytes.fromhex(
+    '4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b')).strip()
+
+default_algorithm = dict(
+        symmetric=dict(
+            cipher='nacl'),
+        pre=dict(
+            cipher='bbs98',
+            curve=714,          # secp256k1 in OpenSSL
+            g=b'1:' + _bitcoin_genesis,
+            m=None, n=None))
+
+
+def symmetric_from_algorithm(algorithm):
+    module = importlib('nkms.crypto.block.' + algorithm['symmetric']['cipher'])
+    # TODO need to cache this
+    return module.Cipher
+
+
+def pre_from_algorithm(algorithm):
+    kw = {k: v for k, v in algorithm['pre'].items()
+          if k != 'cipher' and v is not None}
+    module = importlib('nkms.crypto.block.' + algorithm['pre']['cipher'])
+    # TODO need to cache this
+    return module.PRE(**kw)

nkms/crypto/block/nacl.py

@@ -0,0 +1,3 @@
+from nacl.secret import SecretBox as Cipher  # noqa
+
+# NaCl interface is convenient enough by itself (see tests)

nkms/crypto/pre/bbs98.py

@@ -0,0 +1,3 @@
+from npre.bbs98 import PRE  # noqa
+
+# This is just to develop the interface, some more secure algos should be used

setup.py

@@ -3,7 +3,9 @@ from distutils.core import setup
 INSTALL_REQUIRES = [
         'kademlia>=1.0',
         'rpcudp>=3.0',
-        'ZODB>=5.0']
+        'ZODB>=5.0',
+        'pynacl',
+        'npre']
 
 TESTS_REQUIRE = [
     'pytest',
@@ -16,7 +18,8 @@ TESTS_REQUIRE = [
 # should add --process-dependency-links to pip
 LINKS = [
         'https://github.com/bmuller/kademlia/archive/python3.5.tar.gz#egg=kademlia-1.0',
-        'https://github.com/bmuller/rpcudp/archive/python3.5.tar.gz#egg=rpcudp-3.0.0']
+        'https://github.com/bmuller/rpcudp/archive/python3.5.tar.gz#egg=rpcudp-3.0.0',
+        'https://github.com/nucypher/nucypher-pre-python/archive/master.tar.gz#egg=npre-0.1']
 
 setup(name='nkms',
       version='0.1',