VS 2008 : Error - "Padding Is Invalid And Cannot Be Removed"

Aug 25, 2009

I'm using this class to encrypt/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.

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Decryption Error : Padding Is Invalid And Cannot Be Removed

Apr 23, 2010

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

Try

[CODE]...

And it provides a stack trace with:

at System.Security.Cryptography.RijndaelManagedTransform.DecryptData(Byte[] inputBuffer, Int32 inputOffset, Int32 inputCount, Byte[]& outputBuffer, Int32 outputOffset, PaddingMode paddingMode, Boolean fLast)

[CODE]...

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.

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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:

[Code]...

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[code]....

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[code]....

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[Code]....

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[Code]...

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[code].....

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[code]....

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[code]....

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