3DES confusion

[tshad]

I am trying to use 3DES to encrypt my keys and am using VS 2003.

I am confused with some code I have that seems to use a hash (MD5) in the
3DES. But a Hash is one way. You are not suppose to be able to decrypt it.
The only thing I can figure is that it is using the hash only on the key.

Also, the

*************** *************** *************** ********
Public Shared Function TripleDESEncode (ByVal value As String, ByVal
key As String) As String
Dim des As New
Security.Crypto graphy.TripleDE SCryptoServiceP rovider
des.IV = New Byte(7) {}
Dim pdb As New Security.Crypto graphy.Password DeriveBytes(key ,
New Byte(-1) {})
des.Key = pdb.CryptDerive Key("TripleDES" , "MD5", 168, New
Byte(7) {})
Dim ms As New IO.MemoryStream ((value.Length * 2) - 1)
Dim encStream As New Security.Crypto graphy.CryptoSt ream(ms,
des.CreateEncry ptor(), Security.Crypto graphy.CryptoSt reamMode.Write)
Dim plainBytes As Byte() = Text.Encoding.U TF8.GetBytes(va lue)
encStream.Write (plainBytes, 0, plainBytes.Leng th)
encStream.Flush FinalBlock()
Dim encryptedBytes( CInt(ms.Length - 1)) As Byte
ms.Position = 0
ms.Read(encrypt edBytes, 0, CInt(ms.Length) )
encStream.Close ()
Return Convert.ToBase6 4String(encrypt edBytes)
End Function
*************** *************** *************** *************** *

The other thing I noticed was that when I looked at the value pdb.HashName
and des.pdb.HashNam e it shows "SHA1" instead of "MD5"????

Am I doing something wrong here?

Thanks,

Tom

[Mark Rae]

"tshad" <ts**********@f tsolutions.comw rote in message
news:uL******** ******@TK2MSFTN GP02.phx.gbl...

>I am trying to use 3DES to encrypt my keys and am using VS 2003.

I am confused with some code I have that seems to use a hash (MD5) in the
3DES. But a Hash is one way. You are not suppose to be able to decrypt
it. The only thing I can figure is that it is using the hash only on the
key.

Contact me privately and I'll give you a copy of my 3DES encryption base
class - it's in C#, but should give you enough guidance to solve your
problem...