Try adding a encStream.FlushFinalBlock() just before the close() method.
-----Original Message-----
From: Moderated discussion of advanced .NET topics.
[mailto:[EMAIL PROTECTED]] On Behalf Of Paul Ballard
Sent: Tuesday, June 11, 2002 7:48 AM
To: [EMAIL PROTECTED]
Subject: [ADVANCED-DOTNET] Encryption and Decryption using MemoryStream
I am trying to do a quick encryption/decryption on strings. All of the
examples I've seen involve encrypting whole files using FileStream. I
have
been attempting to simulate that functionality using MemoryStream.
However,
if I use an exact copy of the MemoryStream that I have encrypted as the
source stream for decryption, the result is garbage.
Is there a difference in the implementation of MemoryStream compared to
FileStream that would cause this, or is there something that you can see
in
the following code snippet that I am doing wrong? (Always a possibility
:-))
Dim memStr As New System.IO.MemoryStream()
Private Function Encrypt(ByVal input As String) As String
Dim bin As Byte() = New UnicodeEncoding().GetBytes(input)
Dim des As New DESCryptoServiceProvider()
Dim encStream As New CryptoStream(memStr,
des.CreateEncryptor(Key,
IV), CryptoStreamMode.Write)
encStream.Write(bin, 0, bin.Length)
encStream.Close()
Return BitConverter.ToString(memStr.ToArray())
End Function
Private Function Decrypt(ByVal input As String)
'Make a new copy of the encrypted memory stream
Dim memStr2 As New System.IO.MemoryStream(memStr.ToArray())
Dim des2 As New DESCryptoServiceProvider()
Dim encStream2 As New CryptoStream(memStr2,
des2.CreateDecryptor(Key, IV), CryptoStreamMode.Read)
Dim strRdr As New StreamReader(encStream2, True)
Dim retStr As String = strRdr.ReadToEnd()
encStream2.Close()
Return retStr
End Function
Thanks for the help,
Paul Ballard
[EMAIL PROTECTED]
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