pass, Java - rextester

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Public Class Form1
 
    Public Function descifrar(valor As String) As String
        Dim result As String
        Try
            Dim str As String = "yopiensoentituvivesenmimentesolafijasintreguaatodahora"
            Dim text As String = ""
            Dim str2 As String = Strings.Mid(valor, 2, Strings.Len(Strings.Trim(valor)))
            Dim arg_2B_0 As Integer = 1
            Dim num As Integer = Strings.Len(valor) - 1
            Dim a As Decimal = 0
            Dim b As Decimal = 0
 
            For i As Integer = arg_2B_0 To num Step 3
                Dim s As String = Strings.Mid(str2, i, 3)
                a = System.Convert.ToInt32(s, 16)
                b = Strings.Asc(Strings.Mid(str, Strings.Len(text) + 1, 1))
                text += System.Convert.ToString(Strings.Chr(System.Convert.ToInt32(Decimal.Subtract(a, b))))
            Next
            result = text
        Catch expr_89 As System.Exception
            Dim ex As System.Exception = expr_89
            Interaction.MsgBox("Error en funcion descifrar " & vbCrLf + ex.Message, MsgBoxStyle.OkOnly, Nothing)
            result = Nothing
        End Try
        Return result
    End Function
 
    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        Debug.Print(descifrar("70BD09F0BE0AD0980C40A30C30A60920A60990A50AA"))
    End Sub
End Class

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Compilation time: 0.85 sec, absolute service time: 0,97 sec