Add SecureMessage definitions to CryptAuth.

components/proximity_auth/cryptauth/fake_secure_message_delegate_unittest.cc

+// Copyright 2014 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 "components/proximity_auth/cryptauth/fake_secure_message_delegate.h"
+
+#include "base/bind.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace proximity_auth {
+
+namespace {
+
+const char kTestPublicKey[] = "the private key is in another castle";
+const char kPayload[] = "500 tons of uranium";
+const char kSymmetricKey[] = "hunter2";
+const char kPublicMetadata[] = "brought to you by our sponsors";
+const char kAssociatedData[] = "save 20% bytes on your nonce insurance";
+const char kVerificationKeyId[] = "the one with the red stripes";
+const char kDecryptionKeyId[] = "it's in your pocket somewhere";

[Ilya Sherman, 2015/04/03 22:43:42]

:)

[Tim Song, 2015/04/04 05:06:14]

:)

+
+void SaveKeyPair(std::string* private_key_out,

[Ilya Sherman, 2015/04/03 22:43:42]

nit: Please write (brief) doc strings for all these little helper methods in the
anonymous namespace.

[Tim Song, 2015/04/04 05:06:14]

Done.

+                 std::string* public_key_out,
+                 const std::string& private_key,
+                 const std::string& public_key) {
+  *private_key_out = private_key;
+  *public_key_out = public_key;
+}
+
+void SaveString(std::string* out, const std::string& value) {
+  *out = value;
+}
+
+void SaveUnwrapResults(std::string* payload_out,
+                       securemessage::Header* header_out,
+                       bool verified,
+                       const std::string& payload,
+                       const securemessage::Header& header) {
+  ASSERT_TRUE(verified);
+  *payload_out = payload;
+  *header_out = header;
+}
+
+SecureMessageDelegate::CreateOptions GetCreateOptions(
+    securemessage::EncScheme encryption_scheme,
+    securemessage::SigScheme signature_scheme) {
+  SecureMessageDelegate::CreateOptions create_options;
+  create_options.encryption_scheme = encryption_scheme;
+  create_options.signature_scheme = signature_scheme;
+  create_options.public_metadata = kPublicMetadata;
+  create_options.associated_data = kAssociatedData;
+  create_options.verification_key_id = kVerificationKeyId;
+  create_options.decryption_key_id = kDecryptionKeyId;
+  return create_options;
+}
+
+SecureMessageDelegate::UnwrapOptions GetUnwrapOptions(
+    securemessage::EncScheme encryption_scheme,
+    securemessage::SigScheme signature_scheme) {
+  SecureMessageDelegate::UnwrapOptions unwrap_options;
+  unwrap_options.encryption_scheme = encryption_scheme;
+  unwrap_options.signature_scheme = signature_scheme;
+  unwrap_options.associated_data = kAssociatedData;
+  return unwrap_options;
+}
+
+void CheckSerializedSecureMessage(
+    const std::string& serialized_message,
+    const SecureMessageDelegate::CreateOptions& create_options) {
+  securemessage::SecureMessage secure_message;
+  ASSERT_TRUE(secure_message.ParseFromString(serialized_message));
+  securemessage::HeaderAndBody header_and_body;
+  ASSERT_TRUE(
+      header_and_body.ParseFromString(secure_message.header_and_body()));
+
+  const securemessage::Header& header = header_and_body.header();
+  EXPECT_EQ(create_options.signature_scheme, header.signature_scheme());
+  EXPECT_EQ(create_options.encryption_scheme, header.encryption_scheme());
+  EXPECT_EQ(create_options.verification_key_id, header.verification_key_id());
+  EXPECT_EQ(create_options.decryption_key_id, header.decryption_key_id());
+  EXPECT_EQ(create_options.public_metadata, header.public_metadata());
+}
+
+}  // namespace
+
+class ProximityAuthFakeSecureMessageDelegateTest : public testing::Test {
+ protected:
+  ProximityAuthFakeSecureMessageDelegateTest() {}
+
+  FakeSecureMessageDelegate delegate_;
+
+  DISALLOW_COPY_AND_ASSIGN(ProximityAuthFakeSecureMessageDelegateTest);
+};
+
+TEST_F(ProximityAuthFakeSecureMessageDelegateTest, GenerateKeyPair) {
+  std::string public_key1, private_key1;
+  delegate_.GenerateKeyPair(
+      base::Bind(&SaveKeyPair, &public_key1, &private_key1));
+  EXPECT_NE(private_key1, public_key1);
+
+  std::string public_key2, private_key2;
+  delegate_.GenerateKeyPair(
+      base::Bind(&SaveKeyPair, &public_key2, &private_key2));
+  EXPECT_NE(private_key2, public_key2);
+
+  EXPECT_NE(public_key1, public_key2);
+  EXPECT_NE(private_key1, private_key2);
+
+  delegate_.set_next_public_key(kTestPublicKey);
+  std::string public_key3, private_key3;
+  delegate_.GenerateKeyPair(
+      base::Bind(&SaveKeyPair, &public_key3, &private_key3));
+  EXPECT_EQ(kTestPublicKey, public_key3);
+  EXPECT_NE(private_key3, public_key3);
+
+  EXPECT_NE(public_key1, public_key3);
+  EXPECT_NE(private_key1, private_key3);
+}
+
+TEST_F(ProximityAuthFakeSecureMessageDelegateTest, DeriveKey) {
+  delegate_.set_next_public_key("key_pair_1");
+  std::string public_key1, private_key1;
+  delegate_.GenerateKeyPair(
+      base::Bind(&SaveKeyPair, &public_key1, &private_key1));
+
+  delegate_.set_next_public_key("key_pair_2");
+  std::string public_key2, private_key2;
+  delegate_.GenerateKeyPair(
+      base::Bind(&SaveKeyPair, &public_key2, &private_key2));
+
+  std::string symmetric_key1, symmetric_key2;
+  delegate_.DeriveKey(private_key1, public_key2,
+                      base::Bind(&SaveString, &symmetric_key1));
+  delegate_.DeriveKey(private_key2, public_key1,
+                      base::Bind(&SaveString, &symmetric_key2));
+
+  EXPECT_EQ(symmetric_key1, symmetric_key2);
+}
+
+TEST_F(ProximityAuthFakeSecureMessageDelegateTest,
+       CreateAndUnwrapWithSymmetricKey) {
+  // Create SecureMessage using symmetric key.
+  SecureMessageDelegate::CreateOptions create_options =
+      GetCreateOptions(securemessage::AES_256_CBC, securemessage::HMAC_SHA256);
+  std::string serialized_message;
+  delegate_.CreateSecureMessage(kPayload, kSymmetricKey, create_options,
+                                base::Bind(&SaveString, &serialized_message));
+
+  CheckSerializedSecureMessage(serialized_message, create_options);
+
+  // Unwrap SecureMessage using symmetric key.
+  SecureMessageDelegate::UnwrapOptions unwrap_options =
+      GetUnwrapOptions(securemessage::AES_256_CBC, securemessage::HMAC_SHA256);
+  std::string payload;
+  securemessage::Header header;
+  delegate_.UnwrapSecureMessage(
+      serialized_message, kSymmetricKey, unwrap_options,
+      base::Bind(&SaveUnwrapResults, &payload, &header));
+
+  EXPECT_EQ(kPayload, payload);
+}
+
+TEST_F(ProximityAuthFakeSecureMessageDelegateTest,
+       CreateAndUnwrapWithAsymmetricKey) {
+  delegate_.set_next_public_key(kTestPublicKey);
+  std::string public_key, private_key;
+  delegate_.GenerateKeyPair(
+      base::Bind(&SaveKeyPair, &public_key, &private_key));
+
+  // Create SecureMessage using asymmetric key.
+  SecureMessageDelegate::CreateOptions create_options =
+      GetCreateOptions(securemessage::NONE, securemessage::ECDSA_P256_SHA256);
+  std::string serialized_message;
+  delegate_.CreateSecureMessage(kPayload, private_key, create_options,
+                                base::Bind(&SaveString, &serialized_message));
+
+  CheckSerializedSecureMessage(serialized_message, create_options);
+
+  // Unwrap SecureMessage using symmetric key.
+  SecureMessageDelegate::UnwrapOptions unwrap_options =
+      GetUnwrapOptions(securemessage::NONE, securemessage::ECDSA_P256_SHA256);
+  std::string payload;
+  securemessage::Header header;
+  delegate_.UnwrapSecureMessage(
+      serialized_message, public_key, unwrap_options,
+      base::Bind(&SaveUnwrapResults, &payload, &header));
+
+  EXPECT_EQ(kPayload, payload);
+}
+
+}  // proximity_auth