Fix chronic presubmit warnings/errors.
[chromium-blink-merge.git] / crypto / curve25519.cc
blob3346df93a1ad706838195c7c46e682a8ffef0856
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.
5 #include "crypto/curve25519.h"
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.
11 // Prototype for |curve25519_donna| function in
12 // third_party/curve25519-donna/curve25519-donna.c
13 extern "C" int curve25519_donna(uint8*, const uint8*, const uint8*);
15 namespace crypto {
17 namespace curve25519 {
19 void 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);
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.
28 static const unsigned char kBasePoint[32] = {9};
30 void ScalarBaseMult(const uint8* private_key, uint8* public_key) {
31 curve25519_donna(public_key, private_key, kBasePoint);
34 } // namespace curve25519
36 } // namespace crypto