Vigniere cipher encryption/decryption udf

[Nuffilein805]

hi again

coded 1 more encryption/decryption-tool, but i don't know if i coded it right

it's should be the vigniere cipher

THIS 1 IS NOT SAFE!

if you want to use it, do it on your own risk!

here's the code:

expandcollapse popup

;vigniere
$a = InputBox ("Test", "Insert text")
$b = InputBox ("Test", "Insert code", "CODE")
$c = vigniere($a, $b)
msgbox (0, $a, $c)
$d = unvigniere($c, $b)
msgbox (0, $c, $d)

func unvigniere($text, $code)
    $plain = StringReplace ($text, " ", "")
    $plain_letters = StringSplit ($plain, "")
    $plain_code = StringReplace ($code, " ", "")
    $code_letters = StringSplit ($plain_code, "")
    $max_code = $code_letters[0] + 1
    dim $convert[$max_code]
    dim $minus[$max_code]
    for $i = 1 to $code_letters[0] step 1
        $convert[$i] = Asc ($code_letters[$i])
        if $convert[$i] > 64 and $convert[$i] < 90 Then
            $minus[$i] = $convert[$i] - 65
        ElseIf $convert[$i] > 96 and $convert[$i] < 123 Then
            $minus[$i] = $convert[$i] - 97
        EndIf
    Next
    $max_plain = $plain_letters[0] + 1
    dim $plain_convert[$max_plain]
    dim $output[$max_plain]
    $i = 0
    $vigniere = ""
    For $j = 1 to $plain_letters[0] step 1
        $i = $i + 1
        $plain_convert[$j] = Asc ($plain_letters[$j])
        if $i > $code_letters[0] Then
            $i = $i - $code_letters[0]
        EndIf
        $test = $plain_convert[$j] - $minus[$i]
        if $test < 65 Then
            $output[$j] = $plain_convert[$j] + 26 - $minus[$i]
        ElseIf $test > 89 and $test < 97 Then
            $output[$j] = $plain_convert[$j] + 26 - $minus[$i]
        ElseIf $plain_convert[$j] > 96 and $test < 91 Then
            $output[$j] = $test + 26
        Else
            $output[$j] = $test
        EndIf
        $vigniere = $vigniere & chr($output[$j])
    Next
    return $vigniere
EndFunc

func vigniere($text, $code)
        $plain = StringReplace ($text, " ", "")
    $plain_letters = StringSplit ($plain, "")
    $plain_code = StringReplace ($code, " ", "")
    $code_letters = StringSplit ($plain_code, "")
    $max_code = $code_letters[0] + 1
    dim $convert[$max_code]
    dim $minus[$max_code]
    for $i = 1 to $code_letters[0] step 1
        $convert[$i] = Asc ($code_letters[$i])
        if $convert[$i] > 64 and $convert[$i] < 90 Then
            $minus[$i] = $convert[$i] - 65
        ElseIf $convert[$i] > 96 and $convert[$i] < 123 Then
            $minus[$i] = $convert[$i] - 97
        EndIf
    Next
    $max_plain = $plain_letters[0] + 1
    dim $plain_convert[$max_plain]
    dim $output[$max_plain]
    $i = 0
    $vigniere = ""
    For $j = 1 to $plain_letters[0] step 1
        $i = $i + 1
        $plain_convert[$j] = Asc ($plain_letters[$j])
        if $i > $code_letters[0] Then
            $i = $i - $code_letters[0]
        EndIf
        $test = $plain_convert[$j] + $minus[$i]
        if $test > 122 Then
            $output[$j] = $plain_convert[$j] - 26 + $minus[$i]
        ElseIf $test > 90 and $test < 97 Then
            $output[$j] = $plain_convert[$j] - 26 + $minus[$i]
        Else
            $output[$j] = $test
        EndIf
        $vigniere = $vigniere & chr($output[$j])
    Next
    return $vigniere
EndFunc

added a little test in front as usual

hope to get some feedback

vigniere2.au3

Edited October 25, 2005 by Nuffilein805