1// Copyright (c) 2013 The Chromium Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. 4 5#include "crypto/curve25519.h" 6 7// Curve25519 is specified in terms of byte strings, not numbers, so all 8// implementations take and return the same sequence of bits. So the byte 9// order is implicitly specified as in, say, SHA1. 10// 11// Prototype for |curve25519_donna| function in 12// third_party/curve25519-donna/curve25519-donna.c 13extern "C" int curve25519_donna(uint8*, const uint8*, const uint8*); 14 15namespace crypto { 16 17namespace curve25519 { 18 19void ScalarMult(const uint8* private_key, 20 const uint8* peer_public_key, 21 uint8* shared_key) { 22 curve25519_donna(shared_key, private_key, peer_public_key); 23} 24 25// kBasePoint is the base point (generator) of the elliptic curve group. 26// It is little-endian version of '9' followed by 31 zeros. 27// See "Computing public keys" section of http://cr.yp.to/ecdh.html. 28static const unsigned char kBasePoint[32] = {9}; 29 30void ScalarBaseMult(const uint8* private_key, uint8* public_key) { 31 curve25519_donna(public_key, private_key, kBasePoint); 32} 33 34} // namespace curve25519 35 36} // namespace crypto 37