Curve25519-donna changes.

crypto/curve25519.cc

Index: crypto/curve25519.cc
===================================================================
--- crypto/curve25519.cc	(revision 0)
+++ crypto/curve25519.cc	(revision 0)
@@ -0,0 +1,43 @@
+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "crypto/curve25519.h"
+
+#include "crypto/third_party/curve25519-donna/curve25519-donna.h"
+
+using std::string;
+
+namespace crypto {
+
+// static
+int Curve25519::ScalarMultiply(uint8* shared_key,
+                               const uint8* private_key,
+                               const uint8* peer_public_key) {
+  return curve25519_donna(shared_key, private_key, peer_public_key);
+}
+
+// static
+int Curve25519::ScalarMultiplyBase(uint8* public_key,
+                                   const uint8* private_key) {
+  static const unsigned char basepoint[32] = {9};

[wtc, 2013/03/06 00:55:58]

Nit: basepoint => kBasepoint

[ramant (doing other things), 2013/03/06 19:01:05]

Made the kBasePoint name similar to p224.cc
Done.

+  return curve25519_donna(public_key, private_key, basepoint);
+}
+
+// static
+bool Curve25519::ConvertToPrivateKey(uint8* mysecret,
+                                     size_t mysecret_size,
+                                     string* private_key) {
+  if (mysecret_size != crypto_scalarmult_curve25519_SCALARBYTES)
+    return false;
+
+  // This makes |mysecret| a valid scalar, as specified on
+  // http://cr.yp.to/ecdh.html
+  mysecret[0] &= 248;
+  mysecret[31] &= 127;
+  mysecret[31] |= 64;
+  *private_key = string(reinterpret_cast<char*>(mysecret), mysecret_size);
+  return true;
+}
+
+}  // namespace crypto