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 _generate(self):
try:
pub_key_x = OpenSSL.BN_new()
pub_key_y = OpenSSL.BN_new()
key = OpenSSL.EC_KEY_new_by_curve_name(self.curve)
if key == 0:
raise Exception("[OpenSSL] EC_KEY_new_by_curve_name FAIL ...")
if (OpenSSL.EC_KEY_generate_key(key)) == 0:
raise Exception("[OpenSSL] EC_KEY_generate_key FAIL ...")
if (OpenSSL.EC_KEY_check_key(key)) == 0:
raise Exception("[OpenSSL] EC_KEY_check_key FAIL ...")
priv_key = OpenSSL.EC_KEY_get0_private_key(key)
group = OpenSSL.EC_KEY_get0_group(key)
pub_key = OpenSSL.EC_KEY_get0_public_key(key)
if (OpenSSL.EC_POINT_get_affine_coordinates_GFp(
group, pub_key, pub_key_x, pub_key_y, 0)) == 0:
raise Exception(
"[OpenSSL] EC_POINT_get_affine_coordinates_GFp FAIL ...")
privkey = OpenSSL.malloc(0, OpenSSL.BN_num_bytes(priv_key))
pubkeyx = OpenSSL.malloc(0, OpenSSL.BN_num_bytes(pub_key_x))
pubkeyy = OpenSSL.malloc(0, OpenSSL.BN_num_bytes(pub_key_y))
OpenSSL.BN_bn2bin(priv_key, privkey)
privkey = privkey.raw
OpenSSL.BN_bn2bin(pub_key_x, pubkeyx)
pubkeyx = pubkeyx.raw
OpenSSL.BN_bn2bin(pub_key_y, pubkeyy)
pubkeyy = pubkeyy.raw
self.raw_check_key(privkey, pubkeyx, pubkeyy)
return privkey, pubkeyx, pubkeyy
finally:
OpenSSL.EC_KEY_free(key)
OpenSSL.BN_free(pub_key_x)
OpenSSL.BN_free(pub_key_y)