ÿØÿàJFIFÿþ ÿÛC       ÿÛC ÿÀÿÄÿÄ"#QrÿÄÿÄ&1!A"2qQaáÿÚ ?Øy,æ/3JæݹÈ߲؋5êXw²±ÉyˆR”¾I0ó2—PI¾IÌÚiMö¯–þrìN&"KgX:Šíµ•nTJnLK„…@!‰-ý ùúmë;ºgµŒ&ó±hw’¯Õ@”Ü— 9ñ-ë.²1<yà‚¹ïQÐU„ہ?.’¦èûbß±©Ö«Âw*VŒ) `$‰bØԟ’ëXÖ-ËTÜíGÚ3ð«g Ÿ§¯—Jx„–’U/ÂÅv_s(Hÿ@TñJÑãõçn­‚!ÈgfbÓc­:él[ðQe 9ÀPLbÃãCµm[5¿ç'ªjglå‡Ûí_§Úõl-;"PkÞÞÁQâ¼_Ñ^¢SŸx?"¸¦ùY騐ÒOÈ q’`~~ÚtËU¹CڒêV  I1Áß_ÿÙ# 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 import exceptions as exc from nacl._sodium import ffi, lib from nacl.exceptions import ensure 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 = ffi.new("unsigned char[]", crypto_scalarmult_BYTES) rc = lib.crypto_scalarmult_base(q, n) ensure(rc == 0, 'Unexpected library error', raising=exc.RuntimeError) return 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 = ffi.new("unsigned char[]", crypto_scalarmult_BYTES) rc = lib.crypto_scalarmult(q, n, p) ensure(rc == 0, 'Unexpected library error', raising=exc.RuntimeError) return ffi.buffer(q, crypto_scalarmult_SCALARBYTES)[:]