Jump to content
Sign in to follow this  
Nuffilein805

Vigniere cipher encryption/decryption udf

Recommended Posts

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:

;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 by Nuffilein805

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

×