encrypt/Decrypt a whole file

Hey, Using the code below, i want to be able to ENCRYPT a whole TEXT FILE...

I am not sure how i would make it ENCRYPT a whole file using this, So could someone make it workable? or maybe if someone has an encryption script maybe LIKE THIS ONE or better that will encrypt a FILE/ DECRYPT

::USE:: I am saving a bunch of program settings, and i don't want people to edit them,, so i want my program to SAVE ALL THE SETTINGS, to the file, ENCRYPT IT, and then when i want to open it, it will DECRYPT , and Read it (I have it so i can read it)..

THANKS ALOT
PS: or would i have to import it all into a textbox, and then encrypt the Textbox?? THANKS- i would like to get the program to encrypt it with out textfile.. thanks again

Code:

---

'<<------------------------------------------>>
'START EN/DE crypt PARTS
'<<==========================================>>
#Const CASE_SENSITIVE_PASSWORD = False

Private Sub cmdEncrypt_Click()
    ' You can encrypt twice for extra security
    txtText = EncryptText((txtText), txtPassword)
    txtText = EncryptText((txtText), txtPassword)
End Sub

Private Sub cmdDecrypt_Click()
    txtText = DecryptText((txtText), txtPassword)
    txtText = DecryptText((txtText), txtPassword)
End Sub

'Encrypt text
Private Function EncryptText(strText As String, ByVal strPwd As String)
    Dim i As Integer, c As Integer
    Dim strBuff As String

#If Not CASE_SENSITIVE_PASSWORD Then

    'Convert password to upper case
    'if not case-sensitive
    strPwd = UCase$(strPwd)

#End If

    'Encrypt string
    If Len(strPwd) Then
        For i = 1 To Len(strText)
            c = Asc(Mid$(strText, i, 1))
            c = c + Asc(Mid$(strPwd, (i Mod Len(strPwd)) + 1, 1))
            strBuff = strBuff & Chr$(c And &HFF)
        Next i
    Else
        strBuff = strText
    End If
    EncryptText = strBuff
End Function

'Decrypt text encrypted with EncryptText
Private Function DecryptText(strText As String, ByVal strPwd As String)
    Dim i As Integer, c As Integer
    Dim strBuff As String

#If Not CASE_SENSITIVE_PASSWORD Then

    'Convert password to upper case
    'if not case-sensitive
    strPwd = UCase$(strPwd)

#End If

    'Decrypt string
    If Len(strPwd) Then
        For i = 1 To Len(strText)
            c = Asc(Mid$(strText, i, 1))
            c = c - Asc(Mid$(strPwd, (i Mod Len(strPwd)) + 1, 1))
            strBuff = strBuff & Chr$(c And &HFF)
        Next i
    Else
        strBuff = strText
    End If
    DecryptText = strBuff
End Function

---

You should check http://www.planet-source-code.com for Encryption or Encrypting Files. I'm sure plenty of stuff will come up.

It's actually quite simple :)
I'll explain briefly.

Process the encrypted file, line by line,
until you read the EOF character.

Pass each line you read from the file,
into the function you wrote and append
the output to a temp string.

The end result of the temp string is
your decrypted text. Encryption is just
the opposite.