This class implements the IHasher interface that you can find here.

''' MD5 Hash class from Satal Keto's library
''' Version
Imports System.IO
Imports System.Security.Cryptography
Namespace Security.Hash
    Public Class MD5Hasher
        Implements IHasher
        Public Function hashOfFile(ByVal fileToHash As String) As String Implements IHasher.hashOfFile
            Dim rdr As FileStream
            Dim md5 As New MD5CryptoServiceProvider
            Dim bytes() As Byte
            Dim rtn As String = ""
            If File.Exists(fileToHash) Then
                rdr = New FileStream(fileToHash, FileMode.Open, FileAccess.Read)
                bytes = md5.ComputeHash(rdr)
                rtn = ByteArrayToString(bytes)
            End If
            Return rtn
        End Function
        Public Function hashOfString(ByVal stringToHash As String) As String Implements IHasher.hashOfString
            Dim md5Obj As New MD5CryptoServiceProvider
            Dim bytesToHash() As Byte = System.Text.Encoding.ASCII.GetBytes(stringToHash)
            bytesToHash = md5Obj.ComputeHash(bytesToHash)
            Dim strResult As String = ""
            For Each b As Byte In bytesToHash
                strResult += b.ToString("x2")
            Return strResult
        End Function
        Private Function ByteArrayToString(ByVal arrInput() As Byte) As String
            Dim sb As New System.Text.StringBuilder(arrInput.Length * 2)
            For i As Integer = 0 To arrInput.Length - 1
            Return sb.ToString().ToLower
        End Function
    End Class
End Namespace
Calculate MD5 hash of string or file
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