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. 4 5 #include "crypto/curve25519.h" 6 7 #include <string> 8 9 #include "crypto/random.h" 10 #include "testing/gtest/include/gtest/gtest.h" 11 12 namespace crypto { 13 14 // Test that the basic shared key exchange identity holds: that both parties end 15 // up with the same shared key. This test starts with a fixed private key for 16 // two parties: alice and bob. Runs ScalarBaseMult and ScalarMult to compute 17 // public key and shared key for alice and bob. It asserts that alice and bob 18 // have the same shared key. 19 TEST(Curve25519, SharedKeyIdentity) { 20 uint8 alice_private_key[curve25519::kScalarBytes] = {3}; 21 uint8 bob_private_key[curve25519::kScalarBytes] = {5}; 22 23 // Get public key for alice and bob. 24 uint8 alice_public_key[curve25519::kBytes]; 25 curve25519::ScalarBaseMult(alice_private_key, alice_public_key); 26 27 uint8 bob_public_key[curve25519::kBytes]; 28 curve25519::ScalarBaseMult(bob_private_key, bob_public_key); 29 30 // Get the shared key for alice, by using alice's private key and bob's 31 // public key. 32 uint8 alice_shared_key[curve25519::kBytes]; 33 curve25519::ScalarMult(alice_private_key, bob_public_key, alice_shared_key); 34 35 // Get the shared key for bob, by using bob's private key and alice's public 36 // key. 37 uint8 bob_shared_key[curve25519::kBytes]; 38 curve25519::ScalarMult(bob_private_key, alice_public_key, bob_shared_key); 39 40 // Computed shared key of alice and bob should be the same. 41 ASSERT_EQ(0, memcmp(alice_shared_key, bob_shared_key, curve25519::kBytes)); 42 } 43 44 } // namespace crypto 45
