def __init__(self, curve, os_key=None, private_key=None):
'''
Constructor
'''
if not isinstance(curve, ec_curve.Curve):
raise Exception('Provided curve is not a Curve object')
self.curve = curve
self.os_group = curve.os_group
if os_key is not None:
self.os_key = os_key
else:
self.os_key = OpenSSL.EC_KEY_new()
OpenSSL.EC_KEY_set_group(self.os_key, self.os_group)
if private_key is not None:
privk = ec_bignum.BigNum(decval=private_key)
pubk = private_key * curve.G
OpenSSL.EC_KEY_set_private_key(self.os_key, privk.bn)
OpenSSL.EC_KEY_set_public_key(self.os_key, pubk.os_point)
else:
OpenSSL.EC_KEY_generate_key(self.os_key)
try:
priv_key = ec_bignum.BigNum(
OpenSSL.EC_KEY_get0_private_key(self.os_key))
self.private_key = priv_key.get_value()
self.public_key = ec_point.Point(
self.curve,
openssl_point=OpenSSL.EC_KEY_get0_public_key(self.os_key))
finally:
del priv_key
def __set_to_openssl_point(self, point):
try:
x, y = ec_bignum.BigNum(), ec_bignum.BigNum()
# Put X and Y coordinates of public key into x and y vars
OpenSSL.EC_POINT_get_affine_coordinates_GFp(
self.os_group, point, x.bn, y.bn, None)
self.x, self.y = x.get_value(), y.get_value()
self.os_point = point
finally:
del x, y
def __set_to_coordinates(self, x_val, y_val):
try:
point = OpenSSL.EC_POINT_new(self.os_group)
x, y = ec_bignum.BigNum(decval=x_val), ec_bignum.BigNum(
decval=y_val)
if self.curve.field_type == 'prime':
OpenSSL.EC_POINT_set_affine_coordinates_GFp(
self.os_group, point, x.bn, y.bn, None)
elif self.curve.field_type == 'characteristic-two':
OpenSSL.EC_POINT_set_affine_coordinates_GF2m(
self.os_group, point, x.bn, y.bn, None)
self.x, self.y = x_val, y_val
self.os_point = point
finally:
del x, y
def __mul__(self, other):
"""
Multiply an EC point by a scalar value
and returns the multiplication result
"""
if isinstance(other, int) or isinstance(other, long):
try:
o = ec_bignum.BigNum(decval=other)
result = OpenSSL.EC_POINT_new(self.os_group)
OpenSSL.EC_POINT_mul(self.os_group, result, 0, self.os_point,
o.bn, 0)
return Point(self.curve, openssl_point=result)
finally:
del o
else:
return NotImplemented