Encryption Tool

Imports System.Text
Imports System.Security.Cryptography
Imports System
Imports System****
Imports System.Xml

Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim ofd As New OpenFileDialog
        ofd.Filter = "*.* All Files|*.*"
        ofd.FilterIndex = 1
        If ofd.ShowDialog() = Windows.Forms.DialogResult.OK Then
            TextBox1.Text = ofd.FileName
        End If
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Dim sfd As New SaveFileDialog
        sfd.Filter = "*.txt|*.txt"
        sfd.SupportMultiDottedExtensions = True
        If sfd.ShowDialog() = Windows.Forms.DialogResult.OK Then
        Else
            sfd.ShowDialog()
        End If
        Dim notepad As String = Convert.ToBase64String(IO.File.ReadAllBytes(TextBox1.Text))
        IO.File.AppendAllText(sfd.FileName, notepad)
    End Sub
    Public Function AES_Encrypt(ByVal input As String, ByVal pass As String) As String
        Dim AES As New System.Security.Cryptography.RijndaelManaged
        Dim Hash_AES As New System.Security.Cryptography.MD5CryptoServiceProvider
        Dim encrypted As String = ""
        Try
            Dim hash(31) As Byte
            Dim temp As Byte() = Hash_AES.ComputeHash(System.Text.ASCIIEncoding.ASCII.GetBytes(pass))
            Array.Copy(temp, 0, hash, 0, 16)
            Array.Copy(temp, 0, hash, 15, 16)
            AES.Key = hash
            AES.Mode = Security.Cryptography.CipherMode.ECB
            Dim DESEncrypter As System.Security.Cryptography.ICryptoTransform = AES.CreateEncryptor
            Dim Buffer As Byte() = System.Text.ASCIIEncoding.ASCII.GetBytes(input)
            encrypted = Convert.ToBase64String(DESEncrypter.TransformFinalBlock(Buffer, 0, Buffer.Length))
            Return encrypted
        Catch ex As Exception
        End Try
    End Function

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
        Dim ofd As New OpenFileDialog
        ofd.Filter = "*.* All Files|*.*"
        ofd.FilterIndex = 1
        If ofd.ShowDialog() = Windows.Forms.DialogResult.OK Then
        End If

        Dim sfd As New SaveFileDialog
        sfd.Filter = "*.txt|*.txt"
        sfd.SupportMultiDottedExtensions = True
        If sfd.ShowDialog() = Windows.Forms.DialogResult.OK Then
        Else
            sfd.ShowDialog()
        End If
        Dim notepad As String = AES_Encrypt(IO.File.ReadAllText(ofd.FileName), TextBox2.Text)
        IO.File.AppendAllText(sfd.FileName, notepad)
    End Sub

    Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
        Dim ofd As New OpenFileDialog
        ofd.Filter = "*.* All Files|*.*"
        ofd.FilterIndex = 1
        If ofd.ShowDialog() = Windows.Forms.DialogResult.OK Then
        End If

        Dim sfd As New SaveFileDialog
        sfd.Filter = "*.txt|*.txt"
        sfd.SupportMultiDottedExtensions = True
        If sfd.ShowDialog() = Windows.Forms.DialogResult.OK Then
        Else
            sfd.ShowDialog()
        End If
        Dim notepad As String = CustomXOR_Encrypt(IO.File.ReadAllText(ofd.FileName), TextBox3.Text)
        IO.File.AppendAllText(sfd.FileName, notepad)
    End Sub
    Public Function CustomXOR_Encrypt(ByVal Input As String, ByVal pass As String) As String
        Dim out As New System.Text.StringBuilder
        Dim Hash As New System.Security.Cryptography.MD5CryptoServiceProvider
        Dim XorHash As Byte() = Hash.ComputeHash(System.Text.Encoding.ASCII.GetBytes(pass))
        Dim u As Integer
        For i As Integer = 0 To Input.Length - 1
            Dim tmp As String = Hex(Asc(Input(i)) Xor XorHash(u))
            If tmp.Length = 1 Then tmp = "0" & tmp
            out.Append(tmp)
            If u = pass.Length - 1 Then u = 0 Else u = u + 1
        Next
        Return out.ToString
    End Function
    Public Shared Function rc4(ByVal message As String, ByVal password As String) As String
        Dim i As Integer = 0
        Dim j As Integer = 0
        Dim cipher As New StringBuilder
        Dim returnCipher As String = String.Empty
        Dim sbox As Integer() = New Integer(256) {}
        Dim key As Integer() = New Integer(256) {}
        Dim intLength As Integer = password.Length
        Dim a As Integer = 0
        While a <= 255
            Dim ctmp As Char = (password.Substring((a Mod intLength), 1).ToCharArray()(0))
            key(a) = Microsoft.VisualBasic.Strings.Asc(ctmp)
            sbox(a) = a
            System.Math.Max(System.Threading.Interlocked.Increment(a), a - 1)
        End While
        Dim x As Integer = 0
        Dim b As Integer = 0
        While b <= 255
            x = (x + sbox(b) + key(b)) Mod 256
            Dim tempSwap As Integer = sbox(b)
            sbox(b) = sbox(x)
            sbox(x) = tempSwap
            System.Math.Max(System.Threading.Interlocked.Increment(b), b - 1)
        End While
        a = 1
        While a <= message.Length
            Dim itmp As Integer = 0
            i = (i + 1) Mod 256
            j = (j + sbox(i)) Mod 256
            itmp = sbox(i)
            sbox(i) = sbox(j)
            sbox(j) = itmp
            Dim k As Integer = sbox((sbox(i) + sbox(j)) Mod 256)
            Dim ctmp As Char = message.Substring(a - 1, 1).ToCharArray()(0)
            itmp = Asc(ctmp)
            Dim cipherby As Integer = itmp Xor k
            cipher.Append(Chr(cipherby))
            System.Math.Max(System.Threading.Interlocked.Increment(a), a - 1)
        End While
        returnCipher = cipher.ToString
        cipher.Length = 0
        Return returnCipher
    End Function

    Private Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
        Dim ofd As New OpenFileDialog
        ofd.Filter = "*.* All Files|*.*"
        ofd.FilterIndex = 1
        If ofd.ShowDialog() = Windows.Forms.DialogResult.OK Then
        End If

        Dim sfd As New SaveFileDialog
        sfd.Filter = "*.txt|*.txt"
        sfd.SupportMultiDottedExtensions = True
        If sfd.ShowDialog() = Windows.Forms.DialogResult.OK Then
        Else
            sfd.ShowDialog()
        End If
        Dim notepad As String = rc4(IO.File.ReadAllText(ofd.FileName), TextBox4.Text)
        IO.File.AppendAllText(sfd.FileName, notepad)
    End Sub

    Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click
        Dim ofd As New OpenFileDialog
        ofd.Filter = "*.* All Files|*.*"
        ofd.FilterIndex = 1
        If ofd.ShowDialog() = Windows.Forms.DialogResult.OK Then
        End If

        Dim sfd As New SaveFileDialog
        sfd.Filter = "*.txt|*.txt"
        sfd.SupportMultiDottedExtensions = True
        If sfd.ShowDialog() = Windows.Forms.DialogResult.OK Then
        Else
            sfd.ShowDialog()
        End If


        Dim notepad As String = PolyZero(IO.File.ReadAllText(ofd.FileName), TextBox5.Text)
        IO.File.AppendAllText(sfd.FileName, notepad)
    End Sub
    Private key() As Byte = {}
    Private IV() As Byte = {&H12, &H34, &H56, &H78, &H90, &HAB, &HCD, &HEF}
    Private Const EncryptionKey As String = "abcdefgh"
    'Public Function Decrypt(ByVal stringToDecrypt As String) As String
    '    Try
    '        Dim inputByteArray(stringToDecrypt.Length) As Byte
    '        key = System.Text.Encoding.UTF8.GetBytes(Left(EncryptionKey, 8))
    '        Dim des As New DESCryptoServiceProvider
    '        inputByteArray = Convert.FromBase64String(stringToDecrypt)
    '        Dim ms As New MemoryStream
    '        Dim cs As New CryptoStream(ms, des.CreateDecryptor(key, IV), CryptoStreamMode.Write)
    '        cs.Write(inputByteArray, 0, inputByteArray.Length)
    '        cs.FlushFinalBlock()
    '        Dim encoding As System.Text.Encoding = System.Text.Encoding.UTF8
    '        Return encoding.GetString(ms.ToArray())
    '    Catch ex As Exception
    '        'oops - add your exception logic
    '    End Try
    'End Function

    'Public Function Encrypt(ByVal stringToEncrypt As String) As String
    '    Try
    '        key = System.Text.Encoding.UTF8.GetBytes(Left(EncryptionKey, 8))
    '        Dim des As New DESCryptoServiceProvider
    '        Dim inputByteArray() As Byte = Encoding.UTF8.GetBytes(stringToEncrypt)
    '        Dim ms As New MemoryStream
    '        Dim cs As New CryptoStream(ms, des.CreateEncryptor(key, IV), CryptoStreamMode.Write)
    '        cs.Write(inputByteArray, 0, inputByteArray.Length)
    '        cs.FlushFinalBlock()
    '        Return Convert.ToBase64String(ms.ToArray())
    '    Catch ex As Exception
    '        'oops - add your exception logic
    '    End Try
    'End Function
    Public Function PolyZero(ByVal data As String, ByVal password As String) As String
        Dim rand As New Random
        Dim pass2 As Integer = rand.[Next](2, 999)
        Dim retStr As String = String.Empty
        Dim dataChars As Char() = data.ToCharArray
        For i As Integer = 0 To dataChars.Length - 1
            If i = dataChars.Length - 1 Then
                retStr &= ((AscW(dataChars(i)) + GP(password)) + pass2)
            Else
                retStr &= ((AscW(dataChars(i)) + GP(password)) + pass2) & ","
            End If
        Next
        retStr &= "," & pass2
        Return retStr
    End Function
    Private Function GP(ByVal p As String) As Integer
        Dim z As Char() = p.ToCharArray
        Dim retVal As Integer = 0
        For Each t As Char In z
            retVal += AscW(t)
        Next
        Return retVal
    End Function
End Class