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

crypto/curve25519.h

-// 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.
-
-#ifndef CRYPTO_CURVE25519_H
-#define CRYPTO_CURVE25519_H
-
-#include "base/basictypes.h"
-#include "crypto/crypto_export.h"
-
-namespace crypto {
-
-// Curve25519 implements the elliptic curve group known as Curve25519, as
-// described in "Curve 25519: new Diffie-Hellman Speed Records",
-// by D.J. Bernstein. Additional information is available at
-// http://cr.yp.to/ecdh.html.
-namespace curve25519 {
-
-// kBytes is the number of bytes in the result of the Diffie-Hellman operation,
-// which is an element of GF(2^255-19).
-static const size_t kBytes = 32;
-
-// kScalarBytes is the number of bytes in an element of the scalar field:
-// GF(2^252 + 27742317777372353535851937790883648493).
-static const size_t kScalarBytes = 32;
-
-// ScalarMult computes the |shared_key| from |private_key| and
-// |peer_public_key|. This method is a wrapper for |curve25519_donna()|. It
-// calls that function with |private_key| as |secret| and |peer_public_key| as
-// basepoint. |private_key| should be of length |kScalarBytes| and
-// |peer_public_key| should be of length |kBytes|.
-// See "Computing shared secrets" section of/ http://cr.yp.to/ecdh.html.
-CRYPTO_EXPORT void ScalarMult(const uint8* private_key,
-                              const uint8* peer_public_key,
-                              uint8* shared_key);
-
-// ScalarBaseMult computes the |public_key| from |private_key|. This method is a
-// wrapper for |curve25519_donna()|. It calls that function with |private_key|
-// as |secret| and |kBasePoint| as basepoint. |private_key| should be of length
-// |kScalarBytes|. See "Computing public keys" section of
-// http://cr.yp.to/ecdh.html.
-CRYPTO_EXPORT void ScalarBaseMult(const uint8* private_key, uint8* public_key);
-
-}  // namespace curve25519
-
-}  // namespace crypto
-
-#endif  // CRYPTO_CURVE25519_H