def get_signature_size( signature ):
public_keys, message, c_0, ss, Y_tilde = signature
# Each public key is 64 bytes (32 bytes per coordinate)
size = 64 * len( public_keys )
size += len( ECHelper.int2bin( c_0 ) )
size += sum( map( lambda s: len( ECHelper.int2bin( s ) ), ss ) )
# Y_tilde is also a point, which again requires 64 bytes
size += 64
return size
def get_signature_size( signature ):
public_keys, message, c_0, ss, Y_tilde = signature
# Each public key is 64 bytes (32 bytes per coordinate)
size = 64 * len( public_keys )
size += len( ECHelper.int2bin( c_0 ) )
size += sum( map( lambda s: len( ECHelper.int2bin( s ) ), ss ) )
# Y_tilde is also a point, which again requires 64 bytes
size += 64
return size
def find_point_try_and_increment(self, x):
if self.field_type != 'prime':
raise Exception( "find_point_try_and_increment is only implemented for curves over prime fields")
## HUSK AT FREE BIGNUMS
found = False
x -= 1
while not found:
x += 1
f_x = self.f( x )
y = ECHelper.modular_sqrt( f_x, self.p )
if y != 0:
return ec_point.Point( self, x=x, y=y )
def __init__(self, os_bn=None,decval=None,binval=None):
"""
Constructs a new BN object
and fills it with the value given.
"""
if os_bn is not None:
self.bn = os_bn
self.__created_bn = False
else:
self.bn = OpenSSL.BN_new()
self.__created_bn = True
if decval is None and binval is None:
decval = 0
if decval is not None:
binval = ECHelper.int2bin( decval )
if binval is not None:
OpenSSL.BN_bin2bn( binval, len( binval ), self.bn )
def __init__(self, os_bn=None, decval=None, binval=None):
"""
Constructs a new BN object
and fills it with the value given.
"""
if os_bn is not None:
self.bn = os_bn
self.__created_bn = False
else:
self.bn = OpenSSL.BN_new()
self.__created_bn = True
if decval is None and binval is None:
decval = 0
if decval is not None:
binval = ECHelper.int2bin(decval)
if binval is not None:
OpenSSL.BN_bin2bn(binval, len(binval), self.bn)
def encode_binary(self):
return ECHelper.int2bin(self.x) + ECHelper.int2bin(self.y)
def encode_binary(self):
return ECHelper.int2bin( self.x ) + ECHelper.int2bin( self.y )