AES decryption error “ The input data is not a complete block.” Error vb.net

Question

I keep getting this \"The input data is not a complete block.\" error while decrypting. The function successfully encrypts plain text and puts the IV in a textbox. I am using t

Answer 1

I had the same problem until I implemented with ICryptoTransform:

...
Dim AES As New AesCryptoServiceProvider
AES.Key = Encryptionkey
AES.Mode = CipherMode.CBC
AES.IV = Convert.FromBase64String(tbIV.Text)

Dim transformer As ICryptoTransform = AES.CreateDecryptor()
dim trnsfrmBlock as Byte() = transformer.TransformFinalBlock(EncryptionIn, 0, EncryptionIn.Length)

Return Convert.ToBase64String(trnsfrmBlock)