def __init__(self, rawPublicKey, ec_key=None):
self.ec_key = None # In case of early destruction
assert (rawPublicKey is not None)
assert (len(rawPublicKey) == 64)
self.rawPublicKey = rawPublicKey
if ec_key:
self.ec_key = o.EC_KEY_dup(ec_key)
else:
self.ec_key = self._constructEcFromRawKey(self.rawPublicKey)
def _constructEcFromRawKey(self, rawPrivateKey):
privBignum, ec_key = None, None
try:
ec_key = o.EC_KEY_new_by_curve_name(o.OBJ_txt2nid(b"prime256v1"))
privBuf = bytesToC(rawPrivateKey)
privBignum = o.BN_new()
o.BN_bin2bn(privBuf, 32, privBignum)
o.EC_KEY_set_private_key(ec_key, privBignum)
return o.EC_KEY_dup(ec_key)
finally:
if privBignum:
o.BN_free(privBignum)
if ec_key:
o.EC_KEY_free(ec_key)
def _constructEcFromRawKey(self, rawPublicKey):
ec_key, ec_group, ec_point = None, None, None
try:
ec_key = o.EC_KEY_new_by_curve_name(o.OBJ_txt2nid(b"prime256v1"))
ec_group = o.EC_GROUP_new_by_curve_name(
o.OBJ_txt2nid(b"prime256v1"))
ec_point = o.EC_POINT_new(ec_group)
# Add 0x04 byte to signal "uncompressed" public key
pubBuf = bytesToC(bytearray([0x04]) + rawPublicKey)
o.EC_POINT_oct2point(ec_group, ec_point, pubBuf, 65, None)
o.EC_KEY_set_public_key(ec_key, ec_point)
return o.EC_KEY_dup(ec_key)
finally:
if ec_key:
o.EC_KEY_free(ec_key)
if ec_group:
o.EC_GROUP_free(ec_group)
if ec_point:
o.EC_POINT_free(ec_point)