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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/dbus/easy_unlock/fake_easy_unlock_client.h"
#include <optional>
#include <utility>
#include "base/json/json_reader.h"
#include "base/strings/stringprintf.h"
namespace {
// Keys generated using |GenerateEcP256KeyPair| are in the following format:
// "{<key_type>: <key_pair_index>}".
// <key_pair_index> is an integer identifying
// the key pair.
// <key_type> specifies whether the key is public or private. It can have one
// of the following valies:
const char kEc256PrivateKeyKey[] = "ec_p256_private_key";
const char kEc256PublicKeyKey[] = "ec_p256_public_key";
// Extracts key pair index from a key in format "<key_type>: <key_pair_index>}".
int ExtractKeyPairIndexFromKey(const std::string& key,
const std::string& key_type) {
std::optional<base::Value::Dict> json_value = base::JSONReader::ReadDict(key);
if (!json_value)
return -1;
return json_value->FindInt(key_type).value_or(-1);
}
} // namespace
namespace ash {
// static
bool FakeEasyUnlockClient::IsEcP256KeyPair(const std::string& private_key,
const std::string& public_key) {
int private_key_index =
ExtractKeyPairIndexFromKey(private_key, kEc256PrivateKeyKey);
int public_key_index =
ExtractKeyPairIndexFromKey(public_key, kEc256PublicKeyKey);
return private_key_index > 0 && public_key_index == private_key_index;
}
FakeEasyUnlockClient::FakeEasyUnlockClient() : generated_keys_count_(0) {}
FakeEasyUnlockClient::~FakeEasyUnlockClient() = default;
void FakeEasyUnlockClient::Init(dbus::Bus* bus) {}
void FakeEasyUnlockClient::GenerateEcP256KeyPair(KeyPairCallback callback) {
++generated_keys_count_;
std::move(callback).Run(
base::StringPrintf("{\"%s\": %d}", kEc256PrivateKeyKey,
generated_keys_count_),
base::StringPrintf("{\"%s\": %d}", kEc256PublicKeyKey,
generated_keys_count_));
}
void FakeEasyUnlockClient::WrapPublicKey(const std::string& key_algorithm,
const std::string& public_key,
DataCallback callback) {
std::move(callback).Run(base::StringPrintf(
"{\"wrapped_key\": {\"algorithm\":\"%s\", \"key\":\"%s\"}}",
key_algorithm.c_str(), public_key.c_str()));
}
void FakeEasyUnlockClient::PerformECDHKeyAgreement(
const std::string& private_key,
const std::string& public_key,
DataCallback callback) {
int private_key_index =
ExtractKeyPairIndexFromKey(private_key, kEc256PrivateKeyKey);
int public_key_index =
ExtractKeyPairIndexFromKey(public_key, kEc256PublicKeyKey);
if (private_key_index < 0 || public_key_index < 0) {
std::move(callback).Run(std::string());
return;
}
// ECDH key agreement should be commutative in respect to key pairs to which
// used keys belong, i.e. (key_pair[1].private_key, key_pair[2].public_key)
// and (key_pair[2].private_key, key_pair[1].public_key) should produce the
// same shared key. To achieve this, identify the created key by sum and
// product of the used key pairs.
std::move(callback).Run(base::StringPrintf(
"{\"secret_key\": [%d, %d]}", private_key_index + public_key_index,
private_key_index * public_key_index));
}
void FakeEasyUnlockClient::CreateSecureMessage(
const std::string& payload,
const CreateSecureMessageOptions& options,
DataCallback callback) {
std::move(callback).Run(base::StringPrintf(
"{\"securemessage\": {"
"\"payload\": \"%s\","
"\"key\": \"%s\","
"\"associated_data\": \"%s\","
"\"public_metadata\": \"%s\","
"\"verification_key_id\": \"%s\","
"\"decryption_key_id\": \"%s\","
"\"encryption_type\": \"%s\","
"\"signature_type\": \"%s\""
"}}",
payload.c_str(), options.key.c_str(), options.associated_data.c_str(),
options.public_metadata.c_str(), options.verification_key_id.c_str(),
options.decryption_key_id.c_str(), options.encryption_type.c_str(),
options.signature_type.c_str()));
}
void FakeEasyUnlockClient::UnwrapSecureMessage(
const std::string& message,
const UnwrapSecureMessageOptions& options,
DataCallback callback) {
// TODO(tbarzic): Verify that |message| is in the format returned by
// |CreateSecureMessage| and extract payload, metadata and
// verification_key_id from there.
std::move(callback).Run(base::StringPrintf(
"{\"unwrapped_securemessage\": {"
"\"message\": \"%s\","
"\"key\": \"%s\","
"\"associated_data\": \"%s\","
"\"encryption_type\": \"%s\","
"\"signature_type\": \"%s\""
"}}",
message.c_str(), options.key.c_str(), options.associated_data.c_str(),
options.encryption_type.c_str(), options.signature_type.c_str()));
}
} // namespace ash
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