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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chromeos/ash/components/multidevice/fake_secure_message_delegate.h"
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace ash::multidevice {
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";
// Callback for saving the result of GenerateKeys().
void SaveKeyPair(std::string* private_key_out,
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;
}
// Callback for saving the result of DeriveKey() and CreateSecureMessage().
void SaveString(std::string* out, const std::string& value) {
*out = value;
}
// Callback for saving the result of UnwrapSecureMessage().
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;
}
// Returns the CreateOptions struct to create the test message.
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;
}
// Returns the UnwrapOptions struct to unwrap the test message.
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 CryptAuthFakeSecureMessageDelegateTest : public testing::Test {
public:
CryptAuthFakeSecureMessageDelegateTest(
const CryptAuthFakeSecureMessageDelegateTest&) = delete;
CryptAuthFakeSecureMessageDelegateTest& operator=(
const CryptAuthFakeSecureMessageDelegateTest&) = delete;
protected:
CryptAuthFakeSecureMessageDelegateTest() {}
FakeSecureMessageDelegate delegate_;
};
TEST_F(CryptAuthFakeSecureMessageDelegateTest, GenerateKeyPair) {
std::string public_key1, private_key1;
delegate_.GenerateKeyPair(
base::BindOnce(&SaveKeyPair, &public_key1, &private_key1));
EXPECT_NE(private_key1, public_key1);
std::string public_key2, private_key2;
delegate_.GenerateKeyPair(
base::BindOnce(&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::BindOnce(&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(CryptAuthFakeSecureMessageDelegateTest, DeriveKey) {
delegate_.set_next_public_key("key_pair_1");
std::string public_key1, private_key1;
delegate_.GenerateKeyPair(
base::BindOnce(&SaveKeyPair, &public_key1, &private_key1));
delegate_.set_next_public_key("key_pair_2");
std::string public_key2, private_key2;
delegate_.GenerateKeyPair(
base::BindOnce(&SaveKeyPair, &public_key2, &private_key2));
std::string symmetric_key1, symmetric_key2;
delegate_.DeriveKey(private_key1, public_key2,
base::BindOnce(&SaveString, &symmetric_key1));
delegate_.DeriveKey(private_key2, public_key1,
base::BindOnce(&SaveString, &symmetric_key2));
EXPECT_EQ(symmetric_key1, symmetric_key2);
}
TEST_F(CryptAuthFakeSecureMessageDelegateTest,
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::BindOnce(&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::BindOnce(&SaveUnwrapResults, &payload, &header));
EXPECT_EQ(kPayload, payload);
}
TEST_F(CryptAuthFakeSecureMessageDelegateTest,
CreateAndUnwrapWithAsymmetricKey) {
delegate_.set_next_public_key(kTestPublicKey);
std::string public_key, private_key;
delegate_.GenerateKeyPair(
base::BindOnce(&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::BindOnce(&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::BindOnce(&SaveUnwrapResults, &payload, &header));
EXPECT_EQ(kPayload, payload);
}
TEST_F(CryptAuthFakeSecureMessageDelegateTest, GetPrivateKeyForPublicKey) {
delegate_.set_next_public_key(kTestPublicKey);
std::string public_key, private_key;
delegate_.GenerateKeyPair(
base::BindOnce(&SaveKeyPair, &public_key, &private_key));
EXPECT_EQ(kTestPublicKey, public_key);
EXPECT_EQ(private_key, delegate_.GetPrivateKeyForPublicKey(kTestPublicKey));
}
} // namespace ash::multidevice
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