Reland "Cut down /crypto and switch what is left of it to boringssl".

crypto/curve25519.cc

-// 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"
-
-// Curve25519 is specified in terms of byte strings, not numbers, so all
-// implementations take and return the same sequence of bits. So the byte
-// order is implicitly specified as in, say, SHA1.
-//
-// Prototype for |curve25519_donna| function in
-// third_party/curve25519-donna/curve25519-donna.c
-extern "C" int curve25519_donna(uint8*, const uint8*, const uint8*);
-
-namespace crypto {
-
-namespace curve25519 {
-
-void ScalarMult(const uint8* private_key,
-                const uint8* peer_public_key,
-                uint8* shared_key) {
-  curve25519_donna(shared_key, private_key, peer_public_key);
-}
-
-// kBasePoint is the base point (generator) of the elliptic curve group.
-// It is little-endian version of '9' followed by 31 zeros.
-// See "Computing public keys" section of http://cr.yp.to/ecdh.html.
-static const unsigned char kBasePoint[32] = {9};
-
-void ScalarBaseMult(const uint8* private_key, uint8* public_key) {
-  curve25519_donna(public_key, private_key, kBasePoint);
-}
-
-}  // namespace curve25519
-
-}  // namespace crypto