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FormsAuthentication.HashPasswordForStoringInConfigFile for VB

Posted on 2016-10-27
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Last Modified: 2016-10-28
Hi Experts, I have an ASP.NET application that I am using to create hashes when registering a user. On the other hand I have a VB.NET application that is suppose to check this hash to authenticate the user. What is the VB.NET Windows Application equivalent of FormsAuthentication.HashPasswordForStoringInConfigFile please?

This is how I am generating the hash

Dim hash As String
        hash = FormsAuthentication.HashPasswordForStoringInConfigFile(Label1.Text & "salt", "SHA1")

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Question by:takwirirar
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Ark earned 500 total points
ID: 41863426
String.Join("", Security.Cryptography.SHA1.Create.ComputeHash(
                System.Text.Encoding.UTF8.GetBytes(Label1.Text & "salt")).
                Select(Function(x) x.ToString("X2")))

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Expert Comment

by:Ark
ID: 41863433
If you prefer function:
Private Function HashPasswordForStoringInConfigFile(password As String, passwordFormat As String) As String
    Dim ha As System.Security.Cryptography.HashAlgorithm
    If passwordFormat.Equals("sha1", StringComparison.OrdinalIgnoreCase) Then
        ha = Security.Cryptography.SHA1.Create
    ElseIf passwordFormat.Equals("md5", StringComparison.OrdinalIgnoreCase) Then
        ha = Security.Cryptography.MD5.Create
    Else
        Throw New ArgumentException("Invalid password format")
    End If
    Return String.Join("", ha.ComputeHash(
                 System.Text.Encoding.UTF8.GetBytes(password)).
                 Select(Function(x) x.ToString("X2")))
End Function

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Author Closing Comment

by:takwirirar
ID: 41863532
Great! First solution works just fine although I  think the second is missing the salt?
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LVL 27

Expert Comment

by:Ark
ID: 41864758
Second solution is a copy of FormsAuthentication.HashPasswordForStoringInConfigFile function. You can call it in the same way:
Dim hash As String
hash = HashPasswordForStoringInConfigFile(Label1.Text & "salt", "SHA1")

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