# Copyright 2013 Donald Stufft and individual contributors
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from __future__ import absolute_import, division, print_function

from nacl._lib import lib
from nacl.exceptions import CryptoError


crypto_scalarmult_BYTES = lib.crypto_scalarmult_bytes()
crypto_scalarmult_SCALARBYTES = lib.crypto_scalarmult_scalarbytes()


def crypto_scalarmult_base(n):
    """
    Computes and returns the scalar product of a standard group element and an
    integer ``n``.

    :param n: bytes
    :rtype: bytes
    """
    q = lib.ffi.new("unsigned char[]", crypto_scalarmult_BYTES)

    if lib.crypto_scalarmult_base(q, n) != 0:
        raise CryptoError(
            "An error occurred while computing the scalar product")

    return lib.ffi.buffer(q, crypto_scalarmult_SCALARBYTES)[:]


def crypto_scalarmult(n, p):
    """
    Computes and returns the scalar product of the given group element and an
    integer ``n``.

    :param p: bytes
    :param n: bytes
    :rtype: bytes
    """
    q = lib.ffi.new("unsigned char[]", crypto_scalarmult_BYTES)

    if lib.crypto_scalarmult(q, n, p) != 0:
        raise CryptoError(
            "An error occurred while computing the scalar product")

    return lib.ffi.buffer(q, crypto_scalarmult_SCALARBYTES)[:]

@@ -690,48 +690,8 @@
 lib%0A
-from nacl.exceptions import CryptoError%0A
 %0A%0Acr
@@ -1059,34 +1059,36 @@
 ult_BYTES)%0A%0A    
-if
+rc =
  lib.crypto_scal
@@ -1108,109 +1108,27 @@
 , n)
- != 0:%0A        raise CryptoError(%0A            %22An error occurred while computing the scalar product%22)
+%0A    assert rc == 0
 %0A%0A  
@@ -1460,18 +1460,20 @@
 S)%0A%0A    
-if
+rc =
  lib.cry
@@ -1499,109 +1499,27 @@
 , p)
- != 0:%0A        raise CryptoError(%0A            %22An error occurred while computing the scalar product%22)
+%0A    assert rc == 0
 %0A%0A  

remove unreachable error-handling code