Blind signature updates
- added serializing and deserializing - added a signature chain class `ECCBlindSigChain` - added more tests
This commit is contained in:
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213519bd93
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GPG Key ID:
0C5F50C0B5F37D87
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@ -12,6 +12,7 @@ This is an abandoned package maintained inside of the PyBitmessage.
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from .cipher import Cipher
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from .ecc import ECC
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from .eccblind import ECCBlind
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from .eccblindchain import ECCBlindChain
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from .hash import hmac_sha256, hmac_sha512, pbkdf2
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from .openssl import OpenSSL
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@ -21,6 +22,7 @@ __all__ = [
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'OpenSSL',
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'ECC',
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'ECCBlind',
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'ECCBlindChain',
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'Cipher',
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'hmac_sha256',
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'hmac_sha512',
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@ -1,77 +0,0 @@
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"""
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Blind signature chain with a top level CA
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"""
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from eccblind import ECCBlind
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try:
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import msgpack
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except ImportError:
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try:
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import umsgpack as msgpack
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except ImportError:
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import fallback.umsgpack.umsgpack as msgpack
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from eccblind import ECCBlind
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def encode_datetime(obj):
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"""
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Method to format time
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"""
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return {'Time': int(obj.strftime("%s"))}
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class ECCBlindChain(object): # pylint: disable=too-many-instance-attributes
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"""
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# Class for ECC Blind Chain signature functionality
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"""
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chain = []
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ca = []
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def __init__(self, chain=None):
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if chain is not None:
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self.chain = chain
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def serialize(self):
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data = msgpack.packb(self.chain)
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return data
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@staticmethod
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def deserialize(self, chain):
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"""
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Deserialize the data using msgpack
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"""
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data = msgpack.unpackb(chain)
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return ECCBlindChain(data)
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def add_level(self, pubkey, metadata, signature):
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self.chain.append((pubkey, metadata, signature))
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def add_ca(self, ca):
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pubkey, metadata = ECCBlind.deserialize(ca)
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self.ca.append(pubkey)
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def verify(self, msg, value):
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lastpubkey = None
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retval = False
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for level in reversed(self.chain):
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pubkey, metadata, signature = level
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verifier_obj = ECCBlind(pubkey=pubkey, metadata)
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if not lastpubkey:
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retval = verifier_obj.verify(msg, signature, value)
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else:
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retval = verifier_obj.verify(lastpubkey, signature, value)
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if not reval:
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break
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lastpubkey = pubkey
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if retval:
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retval = False
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for ca in self.ca:
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match = True
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for i in range(4):
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if lastpubkey[i] != ca[i]:
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match = False
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break
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if match:
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return True
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return retval
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@ -10,50 +10,69 @@ http://www.isecure-journal.com/article_39171_47f9ec605dd3918c2793565ec21fcd7a.pd
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# variable names are based on the math in the paper, so they don't conform
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# to PEP8
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from hashlib import sha256
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import time
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try:
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import msgpack
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except ImportError:
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try:
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import umsgpack as msgpack
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except ImportError:
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import fallback.umsgpack.umsgpack as msgpack
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from hashlib import sha256
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from struct import pack, unpack
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from .openssl import OpenSSL
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# first byte in serialisation can contain data
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Y_BIT = 0x01
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COMPRESSED_BIT = 0x02
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class Metadata(object):
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"""
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Pubkey metadata
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"""
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def __init__(self, exp=0, value=0):
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self.exp = 0
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self.value = 0
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if exp:
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self.exp = exp
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if value:
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self.value = value
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# formats
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BIGNUM = '!32s'
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EC = '!B32s'
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PUBKEY = '!BB33s'
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class Expiration(object):
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"""Expiration of pubkey"""
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@staticmethod
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def deserialize(val):
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"""Create an object out of int"""
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year = ((val & 0xF0) >> 4) + 2020
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month = val & 0x0F
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assert month < 12
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return Expiration(year, month)
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def __init__(self, year, month):
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assert isinstance(year, int)
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assert year > 2019 and year < 2036
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assert isinstance(month, int)
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assert month < 12
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self.year = year
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self.month = month
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self.exp = year + month / 12.0
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def serialize(self):
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if self.exp or self.value:
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return [self.exp, self.value]
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else:
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return []
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"""Make int out of object"""
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return ((self.year - 2020) << 4) + self.month
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def verify(self):
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"""Check if the pubkey has expired"""
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now = time.gmtime()
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return self.exp >= now.tm_year + (now.tm_mon - 1) / 12.0
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class Value(object):
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"""Value of a pubkey"""
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@staticmethod
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def deserialize(self, data):
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exp, value = data
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return Medatadata(exp, value)
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def deserialize(val):
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"""Make object out of int"""
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return Value(val)
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def __init__(self, value=0xFF):
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assert isinstance(value, int)
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self.value = value
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def serialize(self):
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"""Make int out of object"""
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return self.value & 0xFF
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def verify(self, value):
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if self.value and value > self.value:
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return False
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if self.exp:
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if time.time() > self.exp:
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return False
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return True
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"""Verify against supplied value"""
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return value <= self.value
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class ECCBlind(object): # pylint: disable=too-many-instance-attributes
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@ -64,8 +83,8 @@ class ECCBlind(object): # pylint: disable=too-many-instance-attributes
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# init
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k = None
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R = None
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keypair = None
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F = None
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d = None
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Q = None
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a = None
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b = None
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@ -76,115 +95,183 @@ class ECCBlind(object): # pylint: disable=too-many-instance-attributes
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m_ = None
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s_ = None
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signature = None
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exp = None
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val = None
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@staticmethod
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def ec_get_random(group, ctx):
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def ec_get_random(self):
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"""
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Random point from finite field
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Random integer within the EC order
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"""
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order = OpenSSL.BN_new()
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OpenSSL.EC_GROUP_get_order(group, order, ctx)
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OpenSSL.BN_rand(order, OpenSSL.BN_num_bits(order), 0, 0)
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return order
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randomnum = OpenSSL.BN_new()
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OpenSSL.BN_rand(randomnum, OpenSSL.BN_num_bits(self.n), 0, 0)
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return randomnum
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@staticmethod
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def ec_invert(group, a, ctx):
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def ec_invert(self, a):
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"""
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ECC inversion
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"""
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order = OpenSSL.BN_new()
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OpenSSL.EC_GROUP_get_order(group, order, ctx)
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inverse = OpenSSL.BN_mod_inverse(0, a, order, ctx)
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inverse = OpenSSL.BN_mod_inverse(0, a, self.n, self.ctx)
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return inverse
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@staticmethod
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def ec_gen_keypair(group, ctx):
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def ec_gen_keypair(self):
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"""
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Generate an ECC keypair
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We're using compressed keys
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"""
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d = ECCBlind.ec_get_random(group, ctx)
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Q = OpenSSL.EC_POINT_new(group)
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OpenSSL.EC_POINT_mul(group, Q, d, 0, 0, 0)
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d = self.ec_get_random()
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Q = OpenSSL.EC_POINT_new(self.group)
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OpenSSL.EC_POINT_mul(self.group, Q, d, 0, 0, 0)
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return (d, Q)
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@staticmethod
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def ec_Ftor(F, group, ctx):
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def ec_Ftor(self, F):
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"""
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x0 coordinate of F
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"""
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# F = (x0, y0)
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x0 = OpenSSL.BN_new()
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y0 = OpenSSL.BN_new()
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OpenSSL.EC_POINT_get_affine_coordinates_GFp(group, F, x0, y0, ctx)
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OpenSSL.EC_POINT_get_affine_coordinates(self.group, F, x0, y0, self.ctx)
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OpenSSL.BN_free(y0)
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return x0
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@staticmethod
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def deserialize(self, data):
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pubkey_deserialized, meta = msgpack.unpackb(data)
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if meta:
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obj = ECCBlind(pubkey=pubkey_deserialized, metadata=meta)
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else:
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obj = ECCBlind(pubkey=pubkey_deserialized)
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return obj
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def _ec_point_serialize(self, point):
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"""Make an EC point into a string"""
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try:
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x = OpenSSL.BN_new()
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y = OpenSSL.BN_new()
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OpenSSL.EC_POINT_get_affine_coordinates(
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self.group, point, x, y, 0)
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y_byte = (OpenSSL.BN_is_odd(y) & Y_BIT) | COMPRESSED_BIT
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l_ = OpenSSL.BN_num_bytes(self.n)
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try:
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bx = OpenSSL.malloc(0, l_)
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OpenSSL.BN_bn2binpad(x, bx, l_)
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out = bx.raw
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except AttributeError:
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# padding manually
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bx = OpenSSL.malloc(0, OpenSSL.BN_num_bytes(x))
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OpenSSL.BN_bn2bin(x, bx)
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out = bx.raw.rjust(l_, chr(0))
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return pack(EC, y_byte, out)
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def serialize(self):
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data = (self.pubkey, self.metadata.serialize)
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retval = msgpack.packb(data)
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finally:
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OpenSSL.BN_clear_free(x)
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OpenSSL.BN_clear_free(y)
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def _ec_point_deserialize(self, data):
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"""Make a string into an EC point"""
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y_bit, x_raw = unpack(EC, data)
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x = OpenSSL.BN_bin2bn(x_raw, OpenSSL.BN_num_bytes(self.n), 0)
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y_bit &= Y_BIT
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retval = OpenSSL.EC_POINT_new(self.group)
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OpenSSL.EC_POINT_set_compressed_coordinates(self.group,
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retval,
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x,
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y_bit,
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self.ctx)
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return retval
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def __init__(self, curve="secp256k1", pubkey=None, metadata=None):
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def _bn_serialize(self, bn):
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"""Make a string out of BigNum"""
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l_ = OpenSSL.BN_num_bytes(self.n)
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try:
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o = OpenSSL.malloc(0, l_)
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OpenSSL.BN_bn2binpad(bn, o, l_)
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return o.raw
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except AttributeError:
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o = OpenSSL.malloc(0, OpenSSL.BN_num_bytes(bn))
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OpenSSL.BN_bn2bin(bn, o)
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return o.raw.rjust(l_, chr(0))
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def _bn_deserialize(self, data):
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"""Make a BigNum out of string"""
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x = OpenSSL.BN_bin2bn(data, OpenSSL.BN_num_bytes(self.n), 0)
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return x
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def _init_privkey(self, privkey):
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"""Initialise private key out of string/bytes"""
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self.d = self._bn_deserialize(privkey)
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def privkey(self):
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"""Make a private key into a string"""
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return pack(BIGNUM, self.d)
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def _init_pubkey(self, pubkey):
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"""Initialise pubkey out of string/bytes"""
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unpacked = unpack(PUBKEY, pubkey)
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self.expiration = Expiration.deserialize(unpacked[0])
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self.value = Value.deserialize(unpacked[1])
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self.Q = self._ec_point_deserialize(unpacked[2])
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def pubkey(self):
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"""Make a pubkey into a string"""
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return pack(PUBKEY, self.expiration.serialize(),
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self.value.serialize(),
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self._ec_point_serialize(self.Q))
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def __init__(self, curve="secp256k1", pubkey=None, privkey=None, # pylint: disable=too-many-arguments
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year=2025, month=11, value=0xFF):
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self.ctx = OpenSSL.BN_CTX_new()
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if pubkey:
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self.group, self.G, self.n, self.Q = pubkey
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else:
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self.group = OpenSSL.EC_GROUP_new_by_curve_name(
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OpenSSL.get_curve(curve))
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# Order n
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self.n = OpenSSL.BN_new()
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OpenSSL.EC_GROUP_get_order(self.group, self.n, self.ctx)
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# ECC group
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self.group = OpenSSL.EC_GROUP_new_by_curve_name(
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OpenSSL.get_curve(curve))
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# Generator G
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self.G = OpenSSL.EC_GROUP_get0_generator(self.group)
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# Order n
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self.n = OpenSSL.BN_new()
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OpenSSL.EC_GROUP_get_order(self.group, self.n, self.ctx)
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# new keypair
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self.keypair = ECCBlind.ec_gen_keypair(self.group, self.ctx)
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self.Q = self.keypair[1]
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self.pubkey = (self.group, self.G, self.n, self.Q)
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# Generator G
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self.G = OpenSSL.EC_GROUP_get0_generator(self.group)
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# Identity O (infinity)
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self.iO = OpenSSL.EC_POINT_new(self.group)
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OpenSSL.EC_POINT_set_to_infinity(self.group, self.iO)
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if metadata:
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self._set_metadata(self, metadata)
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if privkey:
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assert pubkey
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# load both pubkey and privkey from bytes
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self._init_privkey(privkey)
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self._init_pubkey(pubkey)
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elif pubkey:
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# load pubkey from bytes
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self._init_pubkey(pubkey)
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else:
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self.metadata = Metadata()
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# new keypair
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self.d, self.Q = self.ec_gen_keypair()
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if not year or not month:
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now = time.gmtime()
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if now.tm_mon == 12:
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self.expiration = Expiration(now.tm_year + 1, 1)
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else:
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self.expiration = Expiration(now.tm_year, now.tm_mon + 1)
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else:
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self.expiration = Expiration(year, month)
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self.value = Value(value)
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def _set_metadata(self, metadata):
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self.metadata = Metadata.deserialise(metadata)
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def __del__(self):
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OpenSSL.BN_free(self.n)
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OpenSSL.BN_CTX_free(self.ctx)
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def signer_init(self):
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"""
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Init signer
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"""
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# Signer: Random integer k
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self.k = ECCBlind.ec_get_random(self.group, self.ctx)
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self.k = self.ec_get_random()
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# R = kG
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self.R = OpenSSL.EC_POINT_new(self.group)
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OpenSSL.EC_POINT_mul(self.group, self.R, self.k, 0, 0, 0)
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return self.R
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return self._ec_point_serialize(self.R)
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def create_signing_request(self, R, msg):
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"""
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Requester creates a new signing request
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"""
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self.R = R
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msghash = sha256(msg)
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self.R = self._ec_point_deserialize(R)
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msghash = sha256(msg).digest()
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# Requester: 3 random blinding factors
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self.F = OpenSSL.EC_POINT_new(self.group)
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@ -194,12 +281,12 @@ class ECCBlind(object): # pylint: disable=too-many-instance-attributes
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# F != O
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while OpenSSL.EC_POINT_cmp(self.group, self.F, self.iO, self.ctx) == 0:
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self.a = ECCBlind.ec_get_random(self.group, self.ctx)
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self.b = ECCBlind.ec_get_random(self.group, self.ctx)
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self.c = ECCBlind.ec_get_random(self.group, self.ctx)
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self.a = self.ec_get_random()
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self.b = self.ec_get_random()
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self.c = self.ec_get_random()
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# F = b^-1 * R...
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self.binv = ECCBlind.ec_invert(self.group, self.b, self.ctx)
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self.binv = self.ec_invert(self.b)
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OpenSSL.EC_POINT_mul(self.group, temp, 0, self.R, self.binv, 0)
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OpenSSL.EC_POINT_copy(self.F, temp)
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@ -213,7 +300,7 @@ class ECCBlind(object): # pylint: disable=too-many-instance-attributes
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OpenSSL.EC_POINT_add(self.group, self.F, self.F, temp, 0)
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# F = (x0, y0)
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self.r = ECCBlind.ec_Ftor(self.F, self.group, self.ctx)
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self.r = self.ec_Ftor(self.F)
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# Requester: Blinding (m' = br(m) + a)
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self.m = OpenSSL.BN_new()
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|
|
@ -223,43 +310,48 @@ class ECCBlind(object): # pylint: disable=too-many-instance-attributes
|
|||
OpenSSL.BN_mod_mul(self.m_, self.b, self.r, self.n, self.ctx)
|
||||
OpenSSL.BN_mod_mul(self.m_, self.m_, self.m, self.n, self.ctx)
|
||||
OpenSSL.BN_mod_add(self.m_, self.m_, self.a, self.n, self.ctx)
|
||||
return self.m_
|
||||
return self._bn_serialize(self.m_)
|
||||
|
||||
def blind_sign(self, m_):
|
||||
"""
|
||||
Signer blind-signs the request
|
||||
"""
|
||||
self.m_ = m_
|
||||
self.m_ = self._bn_deserialize(m_)
|
||||
self.s_ = OpenSSL.BN_new()
|
||||
OpenSSL.BN_mod_mul(self.s_, self.keypair[0], self.m_, self.n, self.ctx)
|
||||
OpenSSL.BN_mod_mul(self.s_, self.d, self.m_, self.n, self.ctx)
|
||||
OpenSSL.BN_mod_add(self.s_, self.s_, self.k, self.n, self.ctx)
|
||||
return self.s_
|
||||
OpenSSL.BN_free(self.k)
|
||||
return self._bn_serialize(self.s_)
|
||||
|
||||
def unblind(self, s_):
|
||||
"""
|
||||
Requester unblinds the signature
|
||||
"""
|
||||
self.s_ = s_
|
||||
self.s_ = self._bn_deserialize(s_)
|
||||
s = OpenSSL.BN_new()
|
||||
OpenSSL.BN_mod_mul(s, self.binv, self.s_, self.n, self.ctx)
|
||||
OpenSSL.BN_mod_add(s, s, self.c, self.n, self.ctx)
|
||||
OpenSSL.BN_free(self.a)
|
||||
OpenSSL.BN_free(self.b)
|
||||
OpenSSL.BN_free(self.c)
|
||||
self.signature = (s, self.F)
|
||||
return self.signature
|
||||
return self._bn_serialize(s) + self._ec_point_serialize(self.F)
|
||||
|
||||
def verify(self, msg, signature, value=0):
|
||||
def verify(self, msg, signature, value=1):
|
||||
"""
|
||||
Verify signature with certifier's pubkey
|
||||
"""
|
||||
|
||||
# convert msg to BIGNUM
|
||||
self.m = OpenSSL.BN_new()
|
||||
msghash = sha256(msg)
|
||||
msghash = sha256(msg).digest()
|
||||
OpenSSL.BN_bin2bn(msghash, len(msghash), self.m)
|
||||
|
||||
# init
|
||||
s, self.F = signature
|
||||
s, self.F = (self._bn_deserialize(signature[0:32]),
|
||||
self._ec_point_deserialize(signature[32:]))
|
||||
if self.r is None:
|
||||
self.r = ECCBlind.ec_Ftor(self.F, self.group, self.ctx)
|
||||
self.r = self.ec_Ftor(self.F)
|
||||
|
||||
lhs = OpenSSL.EC_POINT_new(self.group)
|
||||
rhs = OpenSSL.EC_POINT_new(self.group)
|
||||
|
|
@ -273,8 +365,10 @@ class ECCBlind(object): # pylint: disable=too-many-instance-attributes
|
|||
retval = OpenSSL.EC_POINT_cmp(self.group, lhs, rhs, self.ctx)
|
||||
if retval == -1:
|
||||
raise RuntimeError("EC_POINT_cmp returned an error")
|
||||
elif not self.value.verify(value):
|
||||
return False
|
||||
elif not self.expiration.verify():
|
||||
return False
|
||||
elif retval != 0:
|
||||
return False
|
||||
elif self.metadata:
|
||||
return self.metadata.verify(value)
|
||||
return True
|
||||
|
|
|
|||
49
src/pyelliptic/eccblindchain.py
Normal file
49
src/pyelliptic/eccblindchain.py
Normal file
|
|
@ -0,0 +1,49 @@
|
|||
"""
|
||||
Blind signature chain with a top level CA
|
||||
"""
|
||||
|
||||
from .eccblind import ECCBlind
|
||||
|
||||
|
||||
class ECCBlindChain(object): # pylint: disable=too-few-public-methods
|
||||
"""
|
||||
# Class for ECC Blind Chain signature functionality
|
||||
"""
|
||||
chain = []
|
||||
ca = []
|
||||
|
||||
def __init__(self, ca=None, chain=None):
|
||||
if ca:
|
||||
for i in range(0, len(ca), 35):
|
||||
self.ca.append(ca[i:i + 35])
|
||||
if chain:
|
||||
self.chain.append(chain[0:35])
|
||||
for i in range(35, len(chain), 100):
|
||||
if len(chain[i:]) == 65:
|
||||
self.chain.append(chain[i:i + 65])
|
||||
else:
|
||||
self.chain.append(chain[i:i + 100])
|
||||
|
||||
def verify(self, msg, value):
|
||||
"""Verify a chain provides supplied message and value"""
|
||||
parent = None
|
||||
for level in self.chain:
|
||||
pubkey = None
|
||||
signature = None
|
||||
if len(level) == 100:
|
||||
pubkey, signature = (level[0:35], level[35:])
|
||||
elif len(level) == 35:
|
||||
if level not in self.ca:
|
||||
return False
|
||||
parent = level
|
||||
continue
|
||||
else:
|
||||
signature = level
|
||||
verifier_obj = ECCBlind(pubkey=parent)
|
||||
if pubkey:
|
||||
if not verifier_obj.verify(pubkey, signature, value):
|
||||
return False
|
||||
parent = pubkey
|
||||
else:
|
||||
return verifier_obj.verify(msg, signature, value)
|
||||
return None
|
||||
|
|
@ -8,6 +8,7 @@ needed openssl functionality in class _OpenSSL.
|
|||
"""
|
||||
import ctypes
|
||||
import sys
|
||||
|
||||
# pylint: disable=protected-access
|
||||
|
||||
OpenSSL = None
|
||||
|
|
@ -97,6 +98,10 @@ class _OpenSSL(object):
|
|||
self.BN_free.restype = None
|
||||
self.BN_free.argtypes = [ctypes.c_void_p]
|
||||
|
||||
self.BN_clear_free = self._lib.BN_clear_free
|
||||
self.BN_clear_free.restype = None
|
||||
self.BN_clear_free.argtypes = [ctypes.c_void_p]
|
||||
|
||||
self.BN_num_bits = self._lib.BN_num_bits
|
||||
self.BN_num_bits.restype = ctypes.c_int
|
||||
self.BN_num_bits.argtypes = [ctypes.c_void_p]
|
||||
|
|
@ -105,6 +110,15 @@ class _OpenSSL(object):
|
|||
self.BN_bn2bin.restype = ctypes.c_int
|
||||
self.BN_bn2bin.argtypes = [ctypes.c_void_p, ctypes.c_void_p]
|
||||
|
||||
try:
|
||||
self.BN_bn2binpad = self._lib.BN_bn2binpad
|
||||
self.BN_bn2binpad.restype = ctypes.c_int
|
||||
self.BN_bn2binpad.argtypes = [ctypes.c_void_p, ctypes.c_void_p,
|
||||
ctypes.c_int]
|
||||
except AttributeError:
|
||||
# optional, we have a workaround
|
||||
pass
|
||||
|
||||
self.BN_bin2bn = self._lib.BN_bin2bn
|
||||
self.BN_bin2bn.restype = ctypes.c_void_p
|
||||
self.BN_bin2bn.argtypes = [ctypes.c_void_p, ctypes.c_int,
|
||||
|
|
@ -147,6 +161,20 @@ class _OpenSSL(object):
|
|||
ctypes.c_void_p,
|
||||
ctypes.c_void_p]
|
||||
|
||||
try:
|
||||
self.EC_POINT_get_affine_coordinates = \
|
||||
self._lib.EC_POINT_get_affine_coordinates
|
||||
except AttributeError:
|
||||
# OpenSSL docs say only use this for backwards compatibility
|
||||
self.EC_POINT_get_affine_coordinates = \
|
||||
self._lib.EC_POINT_get_affine_coordinates_GF2m
|
||||
self.EC_POINT_get_affine_coordinates.restype = ctypes.c_int
|
||||
self.EC_POINT_get_affine_coordinates.argtypes = [ctypes.c_void_p,
|
||||
ctypes.c_void_p,
|
||||
ctypes.c_void_p,
|
||||
ctypes.c_void_p,
|
||||
ctypes.c_void_p]
|
||||
|
||||
self.EC_KEY_set_private_key = self._lib.EC_KEY_set_private_key
|
||||
self.EC_KEY_set_private_key.restype = ctypes.c_int
|
||||
self.EC_KEY_set_private_key.argtypes = [ctypes.c_void_p,
|
||||
|
|
@ -171,6 +199,34 @@ class _OpenSSL(object):
|
|||
ctypes.c_void_p,
|
||||
ctypes.c_void_p]
|
||||
|
||||
try:
|
||||
self.EC_POINT_set_affine_coordinates = \
|
||||
self._lib.EC_POINT_set_affine_coordinates
|
||||
except AttributeError:
|
||||
# OpenSSL docs say only use this for backwards compatibility
|
||||
self.EC_POINT_set_affine_coordinates = \
|
||||
self._lib.EC_POINT_set_affine_coordinates_GF2m
|
||||
self.EC_POINT_set_affine_coordinates.restype = ctypes.c_int
|
||||
self.EC_POINT_set_affine_coordinates.argtypes = [ctypes.c_void_p,
|
||||
ctypes.c_void_p,
|
||||
ctypes.c_void_p,
|
||||
ctypes.c_void_p,
|
||||
ctypes.c_void_p]
|
||||
|
||||
try:
|
||||
self.EC_POINT_set_compressed_coordinates = \
|
||||
self._lib.EC_POINT_set_compressed_coordinates
|
||||
except AttributeError:
|
||||
# OpenSSL docs say only use this for backwards compatibility
|
||||
self.EC_POINT_set_compressed_coordinates = \
|
||||
self._lib.EC_POINT_set_compressed_coordinates_GF2m
|
||||
self.EC_POINT_set_compressed_coordinates.restype = ctypes.c_int
|
||||
self.EC_POINT_set_compressed_coordinates.argtypes = [ctypes.c_void_p,
|
||||
ctypes.c_void_p,
|
||||
ctypes.c_void_p,
|
||||
ctypes.c_int,
|
||||
ctypes.c_void_p]
|
||||
|
||||
self.EC_POINT_new = self._lib.EC_POINT_new
|
||||
self.EC_POINT_new.restype = ctypes.c_void_p
|
||||
self.EC_POINT_new.argtypes = [ctypes.c_void_p]
|
||||
|
|
@ -215,10 +271,6 @@ class _OpenSSL(object):
|
|||
self._lib.ECDH_set_method.argtypes = [ctypes.c_void_p,
|
||||
ctypes.c_void_p]
|
||||
|
||||
self.BN_CTX_new = self._lib.BN_CTX_new
|
||||
self._lib.BN_CTX_new.restype = ctypes.c_void_p
|
||||
self._lib.BN_CTX_new.argtypes = []
|
||||
|
||||
self.ECDH_compute_key = self._lib.ECDH_compute_key
|
||||
self.ECDH_compute_key.restype = ctypes.c_int
|
||||
self.ECDH_compute_key.argtypes = [ctypes.c_void_p,
|
||||
|
|
@ -477,13 +529,19 @@ class _OpenSSL(object):
|
|||
self.BN_cmp.argtypes = [ctypes.c_void_p,
|
||||
ctypes.c_void_p]
|
||||
|
||||
try:
|
||||
self.BN_is_odd = self._lib.BN_is_odd
|
||||
self.BN_is_odd.restype = ctypes.c_int
|
||||
self.BN_is_odd.argtypes = [ctypes.c_void_p]
|
||||
except AttributeError:
|
||||
# OpenSSL 1.1.0 implements this as a function, but earlier
|
||||
# versions as macro, so we need to workaround
|
||||
self.BN_is_odd = self.BN_is_odd_compatible
|
||||
|
||||
self.BN_bn2dec = self._lib.BN_bn2dec
|
||||
self.BN_bn2dec.restype = ctypes.c_char_p
|
||||
self.BN_bn2dec.argtypes = [ctypes.c_void_p]
|
||||
|
||||
self.BN_CTX_free = self._lib.BN_CTX_free
|
||||
self.BN_CTX_free.argtypes = [ctypes.c_void_p]
|
||||
|
||||
self.EC_GROUP_new_by_curve_name = self._lib.EC_GROUP_new_by_curve_name
|
||||
self.EC_GROUP_new_by_curve_name.restype = ctypes.c_void_p
|
||||
self.EC_GROUP_new_by_curve_name.argtypes = [ctypes.c_int]
|
||||
|
|
@ -600,6 +658,16 @@ class _OpenSSL(object):
|
|||
"""
|
||||
return int((self.BN_num_bits(x) + 7) / 8)
|
||||
|
||||
def BN_is_odd_compatible(self, x):
|
||||
"""
|
||||
returns if BN is odd
|
||||
we assume big endianness, and that BN is initialised
|
||||
"""
|
||||
length = self.BN_num_bytes(x)
|
||||
data = self.malloc(0, length)
|
||||
OpenSSL.BN_bn2bin(x, data)
|
||||
return ord(data[length - 1]) & 1
|
||||
|
||||
def get_cipher(self, name):
|
||||
"""
|
||||
returns the OpenSSL cipher instance
|
||||
|
|
|
|||
|
|
@ -2,14 +2,15 @@
|
|||
Test for ECC blind signatures
|
||||
"""
|
||||
import os
|
||||
import time
|
||||
import unittest
|
||||
from ctypes import cast, c_char_p
|
||||
from hashlib import sha256
|
||||
|
||||
from pybitmessage.pyelliptic.eccblind import ECCBlind, Metadata
|
||||
from pybitmessage.pyelliptic.eccblind import ECCBlind
|
||||
from pybitmessage.pyelliptic.eccblindchain import ECCBlindChain
|
||||
from pybitmessage.pyelliptic.openssl import OpenSSL
|
||||
|
||||
# pylint: disable=protected-access
|
||||
|
||||
|
||||
class TestBlindSig(unittest.TestCase):
|
||||
"""
|
||||
|
|
@ -21,78 +22,261 @@ class TestBlindSig(unittest.TestCase):
|
|||
# (1) Initialization
|
||||
signer_obj = ECCBlind()
|
||||
point_r = signer_obj.signer_init()
|
||||
self.assertEqual(len(signer_obj.pubkey()), 35)
|
||||
|
||||
# (2) Request
|
||||
requester_obj = ECCBlind(pubkey=signer_obj.pubkey)
|
||||
requester_obj = ECCBlind(pubkey=signer_obj.pubkey())
|
||||
# only 64 byte messages are planned to be used in Bitmessage
|
||||
msg = os.urandom(64)
|
||||
msg_blinded = requester_obj.create_signing_request(point_r, msg)
|
||||
self.assertEqual(len(msg_blinded), 32)
|
||||
|
||||
# check
|
||||
msg_blinded_str = OpenSSL.malloc(0, OpenSSL.BN_num_bytes(msg_blinded))
|
||||
OpenSSL.BN_bn2bin(msg_blinded, msg_blinded_str)
|
||||
self.assertNotEqual(msg, cast(msg_blinded_str, c_char_p).value)
|
||||
self.assertNotEqual(sha256(msg).digest(), msg_blinded)
|
||||
|
||||
# (3) Signature Generation
|
||||
signature_blinded = signer_obj.blind_sign(msg_blinded)
|
||||
assert isinstance(signature_blinded, str)
|
||||
self.assertEqual(len(signature_blinded), 32)
|
||||
|
||||
# (4) Extraction
|
||||
signature = requester_obj.unblind(signature_blinded)
|
||||
assert isinstance(signature, str)
|
||||
self.assertEqual(len(signature), 65)
|
||||
|
||||
# check
|
||||
signature_blinded_str = OpenSSL.malloc(0,
|
||||
OpenSSL.BN_num_bytes(
|
||||
signature_blinded))
|
||||
signature_str = OpenSSL.malloc(0, OpenSSL.BN_num_bytes(signature[0]))
|
||||
OpenSSL.BN_bn2bin(signature_blinded, signature_blinded_str)
|
||||
OpenSSL.BN_bn2bin(signature[0], signature_str)
|
||||
self.assertNotEqual(cast(signature_str, c_char_p).value,
|
||||
cast(signature_blinded_str, c_char_p).value)
|
||||
self.assertNotEqual(signature, signature_blinded)
|
||||
|
||||
# (5) Verification
|
||||
verifier_obj = ECCBlind(pubkey=signer_obj.pubkey)
|
||||
verifier_obj = ECCBlind(pubkey=signer_obj.pubkey())
|
||||
self.assertTrue(verifier_obj.verify(msg, signature))
|
||||
|
||||
# Serialization and deserialisation
|
||||
pk = signer_obj.serialize()
|
||||
pko = ECCBlind.deserialize(pk)
|
||||
self.assertTrue(pko.verify(msg, signature))
|
||||
def test_is_odd(self):
|
||||
"""Test our implementation of BN_is_odd"""
|
||||
for _ in range(1024):
|
||||
obj = ECCBlind()
|
||||
x = OpenSSL.BN_new()
|
||||
y = OpenSSL.BN_new()
|
||||
OpenSSL.EC_POINT_get_affine_coordinates(
|
||||
obj.group, obj.Q, x, y, 0)
|
||||
self.assertEqual(OpenSSL.BN_is_odd(y),
|
||||
OpenSSL.BN_is_odd_compatible(y))
|
||||
|
||||
def test_blind_sig_chain(self):
|
||||
def test_serialize_ec_point(self):
|
||||
"""Test EC point serialization/deserialization"""
|
||||
for _ in range(1024):
|
||||
try:
|
||||
obj = ECCBlind()
|
||||
obj2 = ECCBlind()
|
||||
randompoint = obj.Q
|
||||
serialized = obj._ec_point_serialize(randompoint)
|
||||
secondpoint = obj2._ec_point_deserialize(serialized)
|
||||
x0 = OpenSSL.BN_new()
|
||||
y0 = OpenSSL.BN_new()
|
||||
OpenSSL.EC_POINT_get_affine_coordinates(obj.group,
|
||||
randompoint, x0,
|
||||
y0, obj.ctx)
|
||||
x1 = OpenSSL.BN_new()
|
||||
y1 = OpenSSL.BN_new()
|
||||
OpenSSL.EC_POINT_get_affine_coordinates(obj2.group,
|
||||
secondpoint, x1,
|
||||
y1, obj2.ctx)
|
||||
|
||||
self.assertEqual(OpenSSL.BN_cmp(y0, y1), 0)
|
||||
self.assertEqual(OpenSSL.BN_cmp(x0, x1), 0)
|
||||
self.assertEqual(OpenSSL.EC_POINT_cmp(obj.group, randompoint,
|
||||
secondpoint, 0), 0)
|
||||
finally:
|
||||
OpenSSL.BN_free(x0)
|
||||
OpenSSL.BN_free(x1)
|
||||
OpenSSL.BN_free(y0)
|
||||
OpenSSL.BN_free(y1)
|
||||
del obj
|
||||
del obj2
|
||||
|
||||
def test_serialize_bn(self):
|
||||
"""Test Bignum serialization/deserialization"""
|
||||
for _ in range(1024):
|
||||
obj = ECCBlind()
|
||||
obj2 = ECCBlind()
|
||||
randomnum = obj.d
|
||||
serialized = obj._bn_serialize(randomnum)
|
||||
secondnum = obj2._bn_deserialize(serialized)
|
||||
self.assertEqual(OpenSSL.BN_cmp(randomnum, secondnum), 0)
|
||||
|
||||
def test_blind_sig_many(self):
|
||||
"""Test a lot of blind signatures"""
|
||||
for _ in range(1024):
|
||||
self.test_blind_sig()
|
||||
|
||||
def test_blind_sig_value(self):
|
||||
"""Test blind signature value checking"""
|
||||
signer_obj = ECCBlind(value=5)
|
||||
point_r = signer_obj.signer_init()
|
||||
requester_obj = ECCBlind(pubkey=signer_obj.pubkey())
|
||||
msg = os.urandom(64)
|
||||
msg_blinded = requester_obj.create_signing_request(point_r, msg)
|
||||
signature_blinded = signer_obj.blind_sign(msg_blinded)
|
||||
signature = requester_obj.unblind(signature_blinded)
|
||||
verifier_obj = ECCBlind(pubkey=signer_obj.pubkey())
|
||||
self.assertFalse(verifier_obj.verify(msg, signature, value=8))
|
||||
|
||||
def test_blind_sig_expiration(self):
|
||||
"""Test blind signature expiration checking"""
|
||||
signer_obj = ECCBlind(year=2020, month=1)
|
||||
point_r = signer_obj.signer_init()
|
||||
requester_obj = ECCBlind(pubkey=signer_obj.pubkey())
|
||||
msg = os.urandom(64)
|
||||
msg_blinded = requester_obj.create_signing_request(point_r, msg)
|
||||
signature_blinded = signer_obj.blind_sign(msg_blinded)
|
||||
signature = requester_obj.unblind(signature_blinded)
|
||||
verifier_obj = ECCBlind(pubkey=signer_obj.pubkey())
|
||||
self.assertFalse(verifier_obj.verify(msg, signature))
|
||||
|
||||
def test_blind_sig_chain(self): # pylint: disable=too-many-locals
|
||||
"""Test blind signature chain using a random certifier key and a random message"""
|
||||
|
||||
test_levels = 5
|
||||
value = 1
|
||||
test_levels = 4
|
||||
msg = os.urandom(1024)
|
||||
|
||||
chain = ECCBlindChain()
|
||||
ca = ECCBlind()
|
||||
signer_obj = ca
|
||||
signer_pubkey = signer_obj.serialize()
|
||||
|
||||
output = bytearray()
|
||||
|
||||
for level in range(test_levels):
|
||||
if level == 0:
|
||||
metadata = Metadata(exp=int(time.time()) + 100,
|
||||
value=value).serialize()
|
||||
requester_obj = ECCBlind(pubkey=signer_obj.pubkey,
|
||||
metadata=metadata)
|
||||
else:
|
||||
requester_obj = ECCBlind(pubkey=signer_obj.pubkey)
|
||||
if not level:
|
||||
output.extend(ca.pubkey())
|
||||
requester_obj = ECCBlind(pubkey=signer_obj.pubkey())
|
||||
child_obj = ECCBlind()
|
||||
point_r = signer_obj.signer_init()
|
||||
pubkey = child_obj.pubkey()
|
||||
|
||||
if level == test_levels - 1:
|
||||
msg_blinded = requester_obj.create_signing_request(point_r,
|
||||
msg)
|
||||
else:
|
||||
msg_blinded = requester.obj.create_signing_request(point_r,
|
||||
signer_pubkey)
|
||||
msg_blinded = requester_obj.create_signing_request(point_r,
|
||||
pubkey)
|
||||
signature_blinded = signer_obj.blind_sign(msg_blinded)
|
||||
signature = requester_obj.unblind(signature_blinded)
|
||||
chain.add_level(signer_obj.pubkey,
|
||||
signer_obj.metadata.serialize,
|
||||
signature)
|
||||
signer_obj = requester_obj
|
||||
signer_pubkey = requester_obj.serialize()
|
||||
sigchain = chain.serialize()
|
||||
verifychain = ECCBlindChain.deserialize(sigchain)
|
||||
self.assertTrue(verifychain.verify(msg, value))
|
||||
verifier_obj = ECCBlind(pubkey=signer_obj.pubkey())
|
||||
if level == test_levels - 1:
|
||||
self.assertTrue(verifier_obj.verify(msg, 1)
|
||||
else:
|
||||
self.assertTrue(verifier_obj.verify(pubkey, 1)
|
||||
if level != test_levels - 1:
|
||||
output.extend(pubkey)
|
||||
output.extend(signature)
|
||||
signer_obj = child_obj
|
||||
verifychain = ECCBlindChain(ca=ca.pubkey(), chain=str(output))
|
||||
self.assertTrue(verifychain.verify(msg, 1))
|
||||
|
||||
def test_blind_sig_chain_wrong_ca(self): # pylint: disable=too-many-locals
|
||||
"""Test blind signature chain with an unlisted ca"""
|
||||
|
||||
test_levels = 4
|
||||
msg = os.urandom(1024)
|
||||
|
||||
ca = ECCBlind()
|
||||
signer_obj = ca
|
||||
|
||||
output = bytearray()
|
||||
|
||||
for level in range(test_levels):
|
||||
requester_obj = ECCBlind(pubkey=signer_obj.pubkey())
|
||||
child_obj = ECCBlind()
|
||||
if not level:
|
||||
# unlisted CA, but a syntactically valid pubkey
|
||||
output.extend(child_obj.pubkey())
|
||||
point_r = signer_obj.signer_init()
|
||||
pubkey = child_obj.pubkey()
|
||||
|
||||
if level == test_levels - 1:
|
||||
msg_blinded = requester_obj.create_signing_request(point_r,
|
||||
msg)
|
||||
else:
|
||||
msg_blinded = requester_obj.create_signing_request(point_r,
|
||||
pubkey)
|
||||
signature_blinded = signer_obj.blind_sign(msg_blinded)
|
||||
signature = requester_obj.unblind(signature_blinded)
|
||||
if level != test_levels - 1:
|
||||
output.extend(pubkey)
|
||||
output.extend(signature)
|
||||
signer_obj = child_obj
|
||||
verifychain = ECCBlindChain(ca=ca.pubkey(), chain=str(output))
|
||||
self.assertFalse(verifychain.verify(msg, 1))
|
||||
|
||||
def test_blind_sig_chain_wrong_msg(self): # pylint: disable=too-many-locals
|
||||
"""Test blind signature chain with a fake message"""
|
||||
|
||||
test_levels = 4
|
||||
msg = os.urandom(1024)
|
||||
fake_msg = os.urandom(1024)
|
||||
|
||||
ca = ECCBlind()
|
||||
signer_obj = ca
|
||||
|
||||
output = bytearray()
|
||||
|
||||
for level in range(test_levels):
|
||||
if not level:
|
||||
output.extend(ca.pubkey())
|
||||
requester_obj = ECCBlind(pubkey=signer_obj.pubkey())
|
||||
child_obj = ECCBlind()
|
||||
point_r = signer_obj.signer_init()
|
||||
pubkey = child_obj.pubkey()
|
||||
|
||||
if level == test_levels - 1:
|
||||
msg_blinded = requester_obj.create_signing_request(point_r,
|
||||
msg)
|
||||
else:
|
||||
msg_blinded = requester_obj.create_signing_request(point_r,
|
||||
pubkey)
|
||||
signature_blinded = signer_obj.blind_sign(msg_blinded)
|
||||
signature = requester_obj.unblind(signature_blinded)
|
||||
if level != test_levels - 1:
|
||||
output.extend(pubkey)
|
||||
output.extend(signature)
|
||||
signer_obj = child_obj
|
||||
verifychain = ECCBlindChain(ca=ca.pubkey(), chain=str(output))
|
||||
self.assertFalse(verifychain.verify(fake_msg, 1))
|
||||
|
||||
def test_blind_sig_chain_wrong_intermediary(self): # pylint: disable=too-many-locals
|
||||
"""Test blind signature chain using a fake intermediary pubkey"""
|
||||
|
||||
test_levels = 4
|
||||
msg = os.urandom(1024)
|
||||
wrong_level = 2
|
||||
backup_signature = None
|
||||
|
||||
ca = ECCBlind()
|
||||
signer_obj = ca
|
||||
|
||||
output = bytearray()
|
||||
|
||||
for level in range(test_levels):
|
||||
if not level:
|
||||
output.extend(ca.pubkey())
|
||||
requester_obj = ECCBlind(pubkey=signer_obj.pubkey())
|
||||
child_obj = ECCBlind()
|
||||
point_r = signer_obj.signer_init()
|
||||
pubkey = child_obj.pubkey()
|
||||
|
||||
if level == test_levels - 1:
|
||||
msg_blinded = requester_obj.create_signing_request(point_r,
|
||||
msg)
|
||||
else:
|
||||
msg_blinded = requester_obj.create_signing_request(point_r,
|
||||
pubkey)
|
||||
signature_blinded = signer_obj.blind_sign(msg_blinded)
|
||||
signature = requester_obj.unblind(signature_blinded)
|
||||
if level != test_levels - 1:
|
||||
output.extend(pubkey)
|
||||
if level == wrong_level:
|
||||
output.extend(backup_signature)
|
||||
else:
|
||||
output.extend(signature)
|
||||
signer_obj = child_obj
|
||||
backup_signature = signature
|
||||
verifychain = ECCBlindChain(ca=ca.pubkey(), chain=str(output))
|
||||
self.assertFalse(verifychain.verify(msg, 1))
|
||||
|
|
|
|||
54
src/tests/test_openssl.py
Normal file
54
src/tests/test_openssl.py
Normal file
|
|
@ -0,0 +1,54 @@
|
|||
"""
|
||||
Test if OpenSSL is working correctly
|
||||
"""
|
||||
import unittest
|
||||
|
||||
from pybitmessage.pyelliptic.openssl import OpenSSL
|
||||
|
||||
try:
|
||||
OpenSSL.BN_bn2binpad
|
||||
have_pad = True
|
||||
except AttributeError:
|
||||
have_pad = None
|
||||
|
||||
|
||||
class TestOpenSSL(unittest.TestCase):
|
||||
"""
|
||||
Test cases for OpenSSL
|
||||
"""
|
||||
def test_is_odd(self):
|
||||
"""Test BN_is_odd implementation"""
|
||||
ctx = OpenSSL.BN_CTX_new()
|
||||
a = OpenSSL.BN_new()
|
||||
group = OpenSSL.EC_GROUP_new_by_curve_name(
|
||||
OpenSSL.get_curve("secp256k1"))
|
||||
OpenSSL.EC_GROUP_get_order(group, a, ctx)
|
||||
|
||||
bad = 0
|
||||
for _ in range(1024):
|
||||
OpenSSL.BN_rand(a, OpenSSL.BN_num_bits(a), 0, 0)
|
||||
if not OpenSSL.BN_is_odd(a) == OpenSSL.BN_is_odd_compatible(a):
|
||||
bad += 1
|
||||
self.assertEqual(bad, 0)
|
||||
|
||||
@unittest.skipUnless(have_pad, 'Skipping OpenSSL pad test')
|
||||
def test_padding(self):
|
||||
"""Test an alternatie implementation of bn2binpad"""
|
||||
|
||||
ctx = OpenSSL.BN_CTX_new()
|
||||
a = OpenSSL.BN_new()
|
||||
n = OpenSSL.BN_new()
|
||||
group = OpenSSL.EC_GROUP_new_by_curve_name(
|
||||
OpenSSL.get_curve("secp256k1"))
|
||||
OpenSSL.EC_GROUP_get_order(group, n, ctx)
|
||||
|
||||
bad = 0
|
||||
for _ in range(1024):
|
||||
OpenSSL.BN_rand(a, OpenSSL.BN_num_bits(n), 0, 0)
|
||||
b = OpenSSL.malloc(0, OpenSSL.BN_num_bytes(n))
|
||||
c = OpenSSL.malloc(0, OpenSSL.BN_num_bytes(a))
|
||||
OpenSSL.BN_bn2binpad(a, b, OpenSSL.BN_num_bytes(n))
|
||||
OpenSSL.BN_bn2bin(a, c)
|
||||
if b.raw != c.raw.rjust(OpenSSL.BN_num_bytes(n), chr(0)):
|
||||
bad += 1
|
||||
self.assertEqual(bad, 0)
|
||||
Reference in New Issue
Block a user