[CLOSED] Aes Encryption fails

[vishalgpt]

why does this function fails, with CipherMode.OFB where as it works with CipherMode.ECB

Public Function EncryptAES(sIn As String, sKey As String) As String
Dim AES As New RijndaelManaged()
Dim ahashMD5 As New MD5CryptoServiceProvider()
AES.Key = ahashMD5.ComputeHash(System.Text.ASCIIEncoding.ASCII.GetBytes(sKey))
AES.Mode = CipherMode.OFB
Dim AESEncrypt As ICryptoTransform = AES.CreateEncryptor()
Dim aBuffer As Byte() = System.Text.ASCIIEncoding.ASCII.GetBytes(sIn)
Return Convert.ToBase64String(AESEncrypt.TransformFinalBlock(aBuffer, 0, aBuffer.Length))
End Function

Error Message : Specified cipher mode is not valid for this algorithm.

Regards, Vishal

[Richard Deeming]

Because the RijndaelManaged class doesn't support the OFB cipher mode. It only supports CBC, ECB and CFB.

---

"These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer

[vishalgpt]

sir can you please guide which aes module for asp.net contains OFB cipher mode

Regards, Vishal

[Richard Deeming]

There doesn't appear to be anything built-in to .NET which supports using AES in OFB mode. You'll need to find a third-party library to support that.

---

"These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer

[vishalgpt]

Thank you

Regards, Vishal