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// Copyright 2009-present MongoDB, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <algorithm>
#include <cstdint>
#include <iostream>
#include <random>
#include <bsoncxx/builder/basic/document.hpp>
#include <bsoncxx/builder/basic/kvp.hpp>
#include <bsoncxx/builder/stream/document.hpp>
#include <bsoncxx/builder/stream/helpers.hpp>
#include <bsoncxx/json.hpp>
#include <bsoncxx/types/bson_value/make_value.hpp>
#include <mongocxx/client.hpp>
#include <mongocxx/client_encryption.hpp>
#include <mongocxx/instance.hpp>
#include <mongocxx/options/auto_encryption.hpp>
#include <mongocxx/options/client.hpp>
#include <mongocxx/options/data_key.hpp>
#include <mongocxx/options/encrypt.hpp>
#include <examples/macros.hh>
using bsoncxx::builder::basic::kvp;
using bsoncxx::builder::basic::make_document;
using bsoncxx::builder::stream::close_document;
using bsoncxx::builder::stream::document;
using bsoncxx::builder::stream::finalize;
using bsoncxx::builder::stream::open_document;
using bsoncxx::types::bson_value::make_value;
using namespace mongocxx;
const int kKeyLength = 96;
int EXAMPLES_CDECL main() {
instance inst{};
// This must be the same master key that was used to create
// the encryption key; here, we use a random key as a placeholder.
std::uint8_t key_storage[kKeyLength];
std::generate_n(key_storage, kKeyLength, []() {
return static_cast<std::uint8_t>(std::rand() % UINT8_MAX);
});
bsoncxx::types::b_binary local_master_key{
bsoncxx::binary_sub_type::k_binary, kKeyLength, key_storage};
auto kms_providers = document{} << "local" << open_document << "key" << local_master_key
<< close_document << finalize;
// Create an unencrypted mongocxx::client.
class client client {
uri {}
};
auto coll = client["test"]["coll"];
// Clear old data.
coll.drop();
// Set up the key vault for this example.
auto key_vault = client["keyvault"]["datakeys"];
// Ensure that two data keys cannot share the same keyAltName by adding
// a unique index on this field.
key_vault.drop();
mongocxx::options::index index_options{};
index_options.unique(true);
auto expression = document{} << "keyAltNames" << open_document << "$exists" << true
<< close_document << finalize;
index_options.partial_filter_expression(expression.view());
key_vault.create_index(make_document(kvp("keyAltNames", 1)), index_options);
// Set up our client_encryption
options::client_encryption client_encryption_opts{};
client_encryption_opts.key_vault_namespace({"keyvault", "datakeys"});
client_encryption_opts.kms_providers(kms_providers.view());
client_encryption_opts.key_vault_client(&client);
class client_encryption client_encryption(std::move(client_encryption_opts));
// Create a new data key for the encryptedField.
auto data_key_id = client_encryption.create_data_key("local");
// Explicitly encrypt a field:
options::encrypt encrypt_opts{};
encrypt_opts.key_id(data_key_id.view());
encrypt_opts.algorithm(options::encrypt::encryption_algorithm::k_deterministic);
auto to_encrypt = make_value("secret message");
auto encrypted_message = client_encryption.encrypt(to_encrypt, encrypt_opts);
coll.insert_one(make_document(kvp("encryptedField", encrypted_message)));
// Automatically decrypts any encrypted fields.
auto res = coll.find_one({});
std::cout << "Explicitly encrypted document: " << bsoncxx::to_json(*res) << std::endl;
// Explicitly decrypt the field:
auto encrypted_message_retrieved = res->view()["encryptedField"].get_value();
auto decrypted_message = client_encryption.decrypt(encrypted_message_retrieved);
std::cout << "Explicitly decrypted message: " << decrypted_message.view().get_string().value
<< std::endl;
}
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