Proteggere un database con chiavi di crittografia gestite dal cliente (CMEK)

using Google.Cloud.Spanner.Admin.Database.V1;
using Google.Cloud.Spanner.Common.V1;
using System;
using System.Threading.Tasks;

public class CreateDatabaseWithEncryptionKeyAsyncSample
{
    public async Task<Database> CreateDatabaseWithEncryptionKeyAsync(string projectId, string instanceId, string databaseId, CryptoKeyName kmsKeyName)
    {
        // Create a DatabaseAdminClient instance that can be used to execute a
        // CreateDatabaseRequest with custom encryption configuration options.
        DatabaseAdminClient databaseAdminClient = DatabaseAdminClient.Create();
        // Define create table statement for table #1.
        var createSingersTable =
            @"CREATE TABLE Singers (
                SingerId INT64 NOT NULL,
                FirstName STRING(1024),
                LastName STRING(1024),
                ComposerInfo BYTES(MAX)
            ) PRIMARY KEY (SingerId)";
        // Define create table statement for table #2.
        var createAlbumsTable =
            @"CREATE TABLE Albums (
                SingerId INT64 NOT NULL,
                AlbumId INT64 NOT NULL,
                AlbumTitle STRING(MAX)
            ) PRIMARY KEY (SingerId, AlbumId),
            INTERLEAVE IN PARENT Singers ON DELETE CASCADE";

        // Create the CreateDatabase request with encryption configuration and execute it.
        var request = new CreateDatabaseRequest
        {
            ParentAsInstanceName = InstanceName.FromProjectInstance(projectId, instanceId),
            CreateStatement = $"CREATE DATABASE `{databaseId}`",
            ExtraStatements = { createSingersTable, createAlbumsTable },
            EncryptionConfig = new EncryptionConfig
            {
                KmsKeyNameAsCryptoKeyName = kmsKeyName,
            },
        };
        var operation = await databaseAdminClient.CreateDatabaseAsync(request);

        // Wait until the operation has finished.
        Console.WriteLine("Waiting for the operation to finish.");
        var completedResponse = await operation.PollUntilCompletedAsync();
        if (completedResponse.IsFaulted)
        {
            Console.WriteLine($"Error while creating database: {completedResponse.Exception}");
            throw completedResponse.Exception;
        }

        var database = completedResponse.Result;
        Console.WriteLine($"Database {database.Name} created with encryption key {database.EncryptionConfig.KmsKeyName}");

        return database;
    }
}

using Google.Cloud.Spanner.Admin.Database.V1;
using Google.Cloud.Spanner.Common.V1;
using System;
using System.Collections.Generic;
using System.Threading.Tasks;

public class CreateDatabaseWithMultiRegionEncryptionAsyncSample
{
    public async Task<Database> CreateDatabaseWithMultiRegionEncryptionAsync(string projectId, string instanceId, string databaseId, IEnumerable<CryptoKeyName> kmsKeyNames)
    {
        // Create a DatabaseAdminClient instance that can be used to execute a
        // CreateDatabaseRequest with custom encryption configuration options.
        DatabaseAdminClient databaseAdminClient = DatabaseAdminClient.Create();
        // Define create table statement for table #1.
        var createSingersTable =
            @"CREATE TABLE Singers (
                SingerId INT64 NOT NULL,
                FirstName STRING(1024),
                LastName STRING(1024),
                ComposerInfo BYTES(MAX)
            ) PRIMARY KEY (SingerId)";
        // Define create table statement for table #2.
        var createAlbumsTable =
            @"CREATE TABLE Albums (
                SingerId INT64 NOT NULL,
                AlbumId INT64 NOT NULL,
                AlbumTitle STRING(MAX)
             ) PRIMARY KEY (SingerId, AlbumId),
             INTERLEAVE IN PARENT Singers ON DELETE CASCADE";

        // Create the CreateDatabase request with encryption configuration and execute it.
        var request = new CreateDatabaseRequest
        {
            ParentAsInstanceName = InstanceName.FromProjectInstance(projectId, instanceId),
            CreateStatement = $"CREATE DATABASE `{databaseId}`",
            ExtraStatements = { createSingersTable, createAlbumsTable },
            EncryptionConfig = new EncryptionConfig
            {
                KmsKeyNamesAsCryptoKeyNames = { kmsKeyNames },
            },
        };
        var operation = await databaseAdminClient.CreateDatabaseAsync(request);

        // Wait until the operation has finished.
        Console.WriteLine("Waiting for the operation to finish.");
        var completedResponse = await operation.PollUntilCompletedAsync();
        if (completedResponse.IsFaulted)
        {
            Console.WriteLine($"Error while creating database: {completedResponse.Exception}");
            throw completedResponse.Exception;
        }

        var database = completedResponse.Result;
        Console.WriteLine($"Database {database.Name} created with encryption keys {string.Join(", ", kmsKeyNames)}");

        return database;
    }
}

void CreateDatabaseWithEncryptionKey(
    google::cloud::spanner_admin::DatabaseAdminClient client,
    std::string const& project_id, std::string const& instance_id,
    std::string const& database_id,
    google::cloud::KmsKeyName const& encryption_key) {
  google::cloud::spanner::Database database(project_id, instance_id,
                                            database_id);
  google::spanner::admin::database::v1::CreateDatabaseRequest request;
  request.set_parent(database.instance().FullName());
  request.set_create_statement("CREATE DATABASE `" + database.database_id() +
                               "`");
  request.add_extra_statements