RijndaelManaged - Error: Padding Is Invalid And Cannot Be Removed
Mar 19, 2012
I am using RijndaelManaged to encrypt just 4 bytes of data which produces a 16 byte result (i am using a 128 block size). When I try to decrypt these 16 bytes I get the message "Padding is invalid and cannot be removed.". (The base stream of the CryptoStream is a MemoryStream based on just these 16 bytes).
I have been writing a security class in my application, I am able to encrypt the string correctly and without error. However every time when I try to decrypt this string again, i get an error with this as it returns the following Padding is invalid and cannot be removed.
Here is the code:
Public Function DecryptKey(ByVal plainText As SecureString, ByVal key() As Byte, ByVal iv() As Byte) As SecureString
I have found simular issues on web, and most of them say that the IV is not the same the encrypted version, but I can confirm that the IV is the same as they both access the exact same variable.
I'm trying to decrypt some data but I get this error: Padding is invalid and cannot be removed. It highlights the _streamWriter.Close() line. This is the code I'm using to decrypt a file:
vb.net Imports System.Security.CryptographyImports System.TextImports System.IO Public Class EncryptFile Private Shared Buffer(4096) As Byte Private Shared _Rijndael As New RijndaelManaged Private Shared _Hash As New SHA256Managed Private Shared _Encoding As New UTF8Encoding Private Shared IV As Byte() = {12, 4, 58, 74, 52, 33, 69, 87, 47, 8, 23, 69, 85, 47, 85, 21} Private
[code]....
When I encrypt a file it gives me no error, but when I decrypt a file it gives me this error: Padding is invalid and cannot be removed. In this line:
vb.net cStream.Close()
I don't understand why, because I'm using the same IV and the same key, I've even checked the generated hash, and to me, it seems the same.
I use the following code to initialize encryption...
[Code]...
So I don't think there is a method for PKCS5. Is there any way to add it, or do I need to write an encryption method myself? If so - how do I write that? Is there a reliable DLL that will support it?
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I have a Problem to Decrypt my crypted files :e.g. if I encrypt this text:
B�AR B�LASDJASPDJAPSDJPASDJPASD asdj ...
And Decrypt it:
AB0_�-M3‚S�r�WPJAPSDJPASDJPASD asdj ...
The first chars are wrong! My Code to Encrypt and Decrypt :
Encrypt:
Public Shared Sub EncryptFile(ByVal sSource As String, ByVal sTarget As String, Optional ByVal BufferSize As Long = 4096) Dim ErrorHappened As Boolean = False Dim OldFileStream As FileStream Dim NewFileStream As FileStream
Lets say we have this code that runs in the constructor:
Dim initVectorBytes As Byte() = System.Text.Encoding.ASCII.GetBytes(initVector) Dim saltValueBytes As Byte() = System.Text.Encoding.ASCII.GetBytes(saltValue) Dim passPharse As String = GenerateKeyString(EncryptionKey) Dim password As Rfc2898DeriveBytes = New Rfc2898DeriveBytes(passPharse, saltValueBytes, passwordIterations) Dim keyBytes As Byte() = password.GetBytes(CInt(keySize / 8)) mSymmetricKey = New RijndaelManaged()
What's the difference? I'm going to create a password encrypting program, and I wanted to know what's the basic difference about the managed class and the "not managed" class.
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[code]....
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