iFunny Authorization Hash

Imports System.Text
Imports System.Security.Cryptography

Public Class Funny
    Public Shared Function AndroidHash() As String
        Static r As New Random
        Dim sb As New StringBuilder
        For i = 0 To 63
            Select Case r.Next(2)
                Case 0
                    sb.Append(Chr(r.Next(65, 71)))
                Case 1
                    sb.Append(Chr(r.Next(48, 58)))
            End Select
        Next

        sb.Append("_MsOIJ39Q28:")

        Dim data As Byte() = Encoding.UTF8.GetBytes(sb.ToString(0, 64) & ":MsOIJ39Q28:PTDc3H8a)Vi=UYap")
        Using sha As SHA1 = New SHA1CryptoServiceProvider()
            For Each b As Byte In sha.ComputeHash(data)
                sb.AppendFormat("{0:x2}", b)
            Next
        End Using

        Return Convert.ToBase64String(Encoding.UTF8.GetBytes(sb.ToString))
    End Function
End Class