Cannot provide password in Connection String for SQLite

问题

I use SQLite with Entity Framework.

I create the DB with following code:

class MyContext : DbContext
{   
    // DbSets, OnModelCreating(), etc.

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        optionsBuilder.UseSqlite("Data Source=c:\\test.db");
    }
}

//this is in my test method
 using (var db = new MyContext())
{
    db.Database.EnsureCreated();
}

The above code works. The DB gets created. But I want to encrypt the DB by providing password in connection string:

optionsBuilder.UseSqlite("Data Source=c:\\test.db;Password=mypassword");

In this case, after EnsureCreated is called, I get exception

An unhandled exception of type 'System.ArgumentException' occurred in System.Data.dll Additional information: Keyword not supported: 'password'.

What is wrong with using password? How can I encrypt that SQLite database?

回答1:

According to this answer Protect SQLite database used by EntityFramework Core Application

EF Core uses Microsoft.Data.Sqlite, which does not currently support encryption out-of-box. See https://github.com/aspnet/Microsoft.Data.Sqlite/issues/184. You could add encryption yourself using SQLite extensions.

At the GitHub link provided there were other links to an alternative at

Encryption in Microsoft.Data.Sqlite

回答2:

The "pure", open source sqlite3.dll does not support encryption. There are other implementations, including licenced and unlicensed. For my solution I have used rindeal/SQLite3-Encryption project from GitHub

My solution:

1. Download compiled binaries
2. Copy sqlite3.dll to BIN folder
   • add the DLL to project in Visual Studio
   • set Copy to Output Directory - Copy always

3. Use this code in context's constructor:

   string password;
   var connection = Database.GetDbConnection();
   connection.Open();
   using (var command = connection.CreateCommand())
   {
       command.CommandText = $"PRAGMA key='{password}';";
       command.ExecuteNonQuery();
   }
   

回答3:

I found a solution that does not involve copying the dll within the BIN folder.

Take a look at it.

回答4:

I've used that implementation that Tschareck posted:

 private const string Password = "1234";
        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            var conn = new SqliteConnection(@"Data Source=test.db;");
            conn.Open();

            using (var command = conn.CreateCommand())
            {
                command.CommandText = $"PRAGMA key = '{Password}';";
                command.ExecuteNonQuery();
            }
            optionsBuilder.UseSqlite(conn);
        }

and managed to put the password to my solution, and solution works fine, but I have another problem - I cannot open database (I'm using DB Browser for SQL Lite) using that password (when I click "Ok" Password gets deleted and nothing happens):

printScreen DB Browser

来源：https://stackoverflow.com/questions/37860933/cannot-provide-password-in-connection-string-for-sqlite