Encryption/Decryption With RijndaelManaged?

May 28, 2009

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

[code].....

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Here is some code that works well for strings:

[Code]....

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When I decrypt an encrypted file; it doesn't have the same size in bytes as the original file and the the hash of the file is different.

I get the bytes of the file using File.ReadAllBytes and send to EncryptBytes with the password. Also the same with DecryptBytes.

When I receive the bytes encrypted or decrypted i save them using File.WriteAllBytes.

I need that the decrypted file and original file have the same hash an bytes.

This my code:

Public Function EncryptBytes(ByVal pass As String, ByVal bytes() As Byte)

Dim myRijndael As New RijndaelManaged
myRijndael.Padding = PaddingMode.Zeros
myRijndael.KeySize = 256

[Code].....

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The error I get is as follows:

Padding is invalid and cannot be removed.on this line in Decrypt.aspx: Dim xReader As XmlTextReader I am thinking it might be at the actual encryption stage causing errors e.g., file not saving correctly.

Encrypt.aspx
Dim rijnAlg As RijndaelManaged
rijnAlg = RijndaelManaged.Create()

[code]......

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Imports System.Text
Public Class Form1
Private Shared DES As New TripleDESCryptoServiceProvider
Private Shared MD5 As New MD5CryptoServiceProvider
[Code] .....

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Dim decryptedtext As String
Dim encryptedtext As String
Dim k As Int16

[code]...

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[code].....

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Lets say we have this code that runs in the constructor:

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[Code]...

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[Code]...

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[Code]...

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Imports System
Imports System.Security.Cryptography
Imports System.IO

[code].....

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