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AES-128, C# -> MySQL

fraW asked
Last Modified: 2012-05-05
Found a question about AES here: https://www.experts-exchange.com/Programming/Languages/.NET/ASP.NET/Q_23534893.html#a21991772

But its closed since its old so im asking my follow up question, as you can see that is an AES implementation for Decypting and Encrypting and im using the built in AES_ENCRYPT in mysql to encrypt my messages, mysql, what i know uses AES-128 with no salt.

Im getting an error telling me that it cannot bad and therefor not deletable. This occures on the last transform.TransformFinalBlock

Oh and using the bult in AES_DECRYPT in mysql returns ??? on UTF-8 characters, maybe its something wrong with the connector?

My code looks like this:
MySqlCommand cmd = new MySqlCommand(
                    @"select MailMessage", conn);
                MySqlDataReader reader = cmd.ExecuteReader();
                string test ;
                while (reader.Read())
                    test = AESEncDec.decrypt(Convert.FromBase64String(((byte[])reader["MailMessage"]).ToString()), "myPassword", 0);

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