Hi,
I have some trouble comparing hashed strings between .Net and .Net Compact Framework. I used normal VB.NET to store a MD5 hashed string in a database. I used the following code to create and compare the same hash (at least, that is what i thought) using VB.NET Compact Framework (with a little help from OpenNetCF)
Dim clearBytes As [Byte]()
Dim MD5 As New MD5CryptoServiceProvider
Dim hashedText As String
Dim hashedBytes As [Byte]()
Dim str as string = "123"
clearBytes = Encoding.Unicode.GetBytes(
hashedBytes = MD5.ComputeHash(clearBytes
hashedText = BitConverter.ToString(hash
This produces the following Hash:
"5F-A2-85-E1-BE-BE-A-66-23
If I compare this to the same Hash i did with VB.NET (Using standard .Net Crypto Provider):
"5F-A2-85-E1-BE-BE-0A-66-2
there is a difference.
Does anyone know how to fix this issue?
BR, DM
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MsgBox(ConvertHashProp("5F
Private Function ConvertHashProp(ByVal value As String) As String
Dim strArr() As String = Split(value, "-")
For i As Int16 = 0 To strArr.GetUpperBound(0) - 1
If strArr(i).Length = 1 Then
strArr(i) = "0" & strArr(i)
End If
Next
Return Join(strArr, "-")
End Function
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Answer for Membership
by: jetforcePosted on 2004-09-10 at 02:35:15ID: 12024882
the problem is is the value is less than 15 (hex F) then there is no prefix of 0
V V
"5F-A2-85-E1-BE-BE-A-66-23
If I compare this to the same Hash i did with VB.NET (Using standard .Net Crypto Provider):
"5F-A2-85-E1-BE-BE-0A-66-2
There is two ways to do this
1) find all the single figures and prefix them with a 0 and then do the compare
or split the string into an array by using the split variable as '-'
2) then compare the values individually by converting them to an integer
Jetforce