Rijndael Encryption 'Length of the data to decrypt is invalid.' C# - Free source code and tutorials for Software developers and Architects.; Updated: 26 Mar 2009. Iso Stereo Connector Diagram on this page. Oct 19, 2009 Length of the data to decrypt is invalid. Rijndael is a fixed block size algorithm, the string to be decrypted needs to be the correct block size.

This fixed it: Public Function EncryptBytes(ByVal Input As Byte(), ByVal Password As String) As Byte() Try Dim PasswordBytes As Byte() = Encoding.UTF8.GetBytes(Password) Dim initVectorBytes As Byte() = Encoding.ASCII.GetBytes('@0B4c3D4e5Y6r7H2') Dim SaltValue As Byte() = Encoding.UTF8.GetBytes('S@ltVa u.