def hash_encode(arg):
"""encode a data type to bytes"""
if type(arg) is bytes:
s = arg
elif type(arg) is ec_element:
s = serialize(arg)
elif type(arg) is str:
s = arg.encode('utf-8')
elif type(arg) is int:
s = arg.to_bytes((arg.bit_length() + 7) // 8, 'little')
elif isinstance(args, tuple):
# based on TupleHash (see NIST SP 800-185)
def left_encode(x):
# This implictly checks for validity conditions:
# An exception is raised if n > 255, i.e., if len(x) > 2**2040
n = (x.bit_length() + 7 ) // 8
return n.to_bytes(1, 'little') + x.to_bytes(n, 'little')
s = b''
for arg in args:
z = hash_encode(arg)
# concat with encode_string(z)
s += left_encode(len(z)) + z
else:
raise ValueError("unexpected type to hash: {}".format(type(arg)))
return s
def hash(self, args, _type=ZR):
if isinstance(args, tuple):
s = bytes()
for i in args:
if type(i) == elliptic_curve:
s += serialize(i)
elif type(i) == str:
s += str(i)
# consider other types
#print("s => %s" % s)
return hashEC(self.group, str(s), _type)
elif type(args) == elliptic_curve:
msg = str(serialize(args))
return hashEC(self.group, msg, _type)
elif type(args) == str:
return hashEC(self.group, args, _type)
return None
def hash(self, args, _type=ZR):
if isinstance(args, tuple):
s = bytes()
for i in args:
if type(i) == elliptic_curve:
s += serialize(i)
elif type(i) == str:
s += str(i)
# consider other types
#print("s => %s" % s)
return hashEC(self.group, str(s), _type)
elif type(args) == elliptic_curve:
msg = str(serialize(args))
return hashEC(self.group, msg, _type)
elif type(args) == str:
return hashEC(self.group, args, _type)
return None
def hash(self, args, target_type=ZR):
"""hashes objects into ZR or G"""
if isinstance(args, tuple):
s = bytes()
for i in args:
if type(i) == ec_element:
s += serialize(i)
elif type(i) == str:
s += bytes(str(i), 'utf8')
elif type(i) == bytes:
s += i
else:
print("unexpected type: ", type(i))
# consider other types
#print("s => %s" % s)
assert len(s) != 0, "hash input is empty."
return hashEC(self.ec_group, str(s), target_type)
elif type(args) == ec_element:
msg = str(serialize(args))
return hashEC(self.ec_group, msg, target_type)
elif type(args) in [str, bytes]:
return hashEC(self.ec_group, args, target_type)
raise Exception("ECGroup - invalid input for hash")
def hash(self, args, target_type=ZR):
"""hashes objects into ZR or G"""
if isinstance(args, tuple):
s = bytes()
for i in args:
if type(i) == ec_element:
s += serialize(i)
elif type(i) == str:
s += bytes(str(i), 'utf8')
elif type(i) == bytes:
s += i
else:
print("unexpected type: ", type(i))
# consider other types
#print("s => %s" % s)
assert len(s) != 0, "hash input is empty."
return hashEC(self.ec_group, str(s), target_type)
elif type(args) == ec_element:
msg = str(serialize(args))
return hashEC(self.ec_group, msg, target_type)
elif type(args) in [str, bytes]:
return hashEC(self.ec_group, args, target_type)
raise Exception("ECGroup - invalid input for hash")
def serialize(self, object):
return serialize(object)
def serialize(self, object):
"""serializes a pairing object into bytes"""
return serialize(object)
def serialize(self, object):
"""serializes a pairing object into bytes"""
return serialize(object)
def serialize(self, object):
return serialize(object)