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author | Zeno Albisser <zeno.albisser@digia.com> | 2013-08-15 21:46:11 +0200 |
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committer | Zeno Albisser <zeno.albisser@digia.com> | 2013-08-15 21:46:11 +0200 |
commit | 679147eead574d186ebf3069647b4c23e8ccace6 (patch) | |
tree | fc247a0ac8ff119f7c8550879ebb6d3dd8d1ff69 /chromium/crypto/curve25519.cc | |
download | qtwebengine-chromium-679147eead574d186ebf3069647b4c23e8ccace6.tar.gz |
Initial import.
Diffstat (limited to 'chromium/crypto/curve25519.cc')
-rw-r--r-- | chromium/crypto/curve25519.cc | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/chromium/crypto/curve25519.cc b/chromium/crypto/curve25519.cc new file mode 100644 index 00000000000..3346df93a1a --- /dev/null +++ b/chromium/crypto/curve25519.cc @@ -0,0 +1,36 @@ +// 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 |