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

Public Class MyFunction
    Public Shared Function MD5FileHash(ByVal sFile As String) As String
        Dim MD5 As New MD5CryptoServiceProvider
        Dim Hash As Byte()
        Dim Result As String = ""
        Dim Tmp As String = ""

        Dim FN As New FileStream(sFile, FileMode.Open, FileAccess.Read, FileShare.Read, 8192)
        MD5.ComputeHash(FN)
        FN.Close()

        Hash = MD5.Hash
        For i As Integer = 0 To Hash.Length - 1
            Tmp = Hex(Hash(i))
            If Len(Tmp) = 1 Then Tmp = "0" & Tmp
            Result += Tmp
        Next
        Return Result
    End Function

    Public Shared Function MD5StringHash(ByVal strString As String) As String
        Dim MD5 As New MD5CryptoServiceProvider
        Dim Data As Byte()
        Dim Result As Byte()
        Dim Res As String = ""
        Dim Tmp As String = ""

        Data = Encoding.ASCII.GetBytes(strString)
        Result = MD5.ComputeHash(Data)
        For i As Integer = 0 To Result.Length - 1
            Tmp = Hex(Result(i))
            If Len(Tmp) = 1 Then Tmp = "0" & Tmp
            Res += Tmp
        Next
        Return Res
    End Function

    Public Shared Function ReadFile(ByVal url As String) As String
        Dim req As System.Net.HttpWebRequest = System.Net.HttpWebRequest.Create(url)
        Dim rep As System.Net.HttpWebResponse = req.GetResponse()
        Dim str As New System.IO.StreamReader(rep.GetResponseStream)
        Return str.ReadToEnd()
    End Function
End Class