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StringEncrypt - too big

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Hi. I'm using stringencrypt witch uses rc4, to encrypt a .txt file.

I took the function out from string.au3.

The thing is, if I encrypt the content of ex. file.txt witch contains just 1 characters, ex: k

then it encrypts it, and turns it into 4 characters, that way my file will be pretty big if I got alot of characets, is there any way to only make it generate 1 characters per character, or maybe 2 ?

Func _StringEncrypt($i_Encrypt, $s_EncryptText, $s_EncryptPassword, $i_EncryptLevel = 1)
If $i_Encrypt <> 0 And $i_Encrypt <> 1 Then
SetError(1, 0, '')
ElseIf $s_EncryptText = '' Or $s_EncryptPassword = '' Then
SetError(1, 0, '')
Else
If Number($i_EncryptLevel) <= 0 Or Int($i_EncryptLevel) <> $i_EncryptLevel Then $i_EncryptLevel = 1
Local $v_EncryptModified
Local $i_EncryptCountH
Local $i_EncryptCountG
Local $v_EncryptSwap
Local $av_EncryptBox[256][2]
Local $i_EncryptCountA
Local $i_EncryptCountB
Local $i_EncryptCountC
Local $i_EncryptCountD
Local $i_EncryptCountE
Local $v_EncryptCipher
Local $v_EncryptCipherBy
If $i_Encrypt = 1 Then
For $i_EncryptCountF = 0 To $i_EncryptLevel Step 1
$i_EncryptCountG = ''
$i_EncryptCountH = ''
$v_EncryptModified = ''
For $i_EncryptCountG = 1 To StringLen($s_EncryptText)
If $i_EncryptCountH = StringLen($s_EncryptPassword) Then
$i_EncryptCountH = 1
Else
$i_EncryptCountH += 1
EndIf
$v_EncryptModified = $v_EncryptModified & Chr(BitXOR(Asc(StringMid($s_EncryptText, $i_EncryptCountG, 1)), Asc(StringMid($s_EncryptPassword, $i_EncryptCountH, 1)), 255))
Next
$s_EncryptText = $v_EncryptModified
$i_EncryptCountA = ''
$i_EncryptCountB = 0
$i_EncryptCountC = ''
$i_EncryptCountD = ''
$i_EncryptCountE = ''
$v_EncryptCipherBy = ''
$v_EncryptCipher = ''
$v_EncryptSwap = ''
$av_EncryptBox = ''
Local $av_EncryptBox[256][2]
For $i_EncryptCountA = 0 To 255
$av_EncryptBox[$i_EncryptCountA][1] = Asc(StringMid($s_EncryptPassword, Mod($i_EncryptCountA, StringLen($s_EncryptPassword)) + 1, 1))
$av_EncryptBox[$i_EncryptCountA][0] = $i_EncryptCountA
Next
For $i_EncryptCountA = 0 To 255
$i_EncryptCountB = Mod(($i_EncryptCountB + $av_EncryptBox[$i_EncryptCountA][0] + $av_EncryptBox[$i_EncryptCountA][1]), 256)
$v_EncryptSwap = $av_EncryptBox[$i_EncryptCountA][0]
$av_EncryptBox[$i_EncryptCountA][0] = $av_EncryptBox[$i_EncryptCountB][0]
$av_EncryptBox[$i_EncryptCountB][0] = $v_EncryptSwap
Next
For $i_EncryptCountA = 1 To StringLen($s_EncryptText)
$i_EncryptCountC = Mod(($i_EncryptCountC + 1), 256)
$i_EncryptCountD = Mod(($i_EncryptCountD + $av_EncryptBox[$i_EncryptCountC][0]), 256)
$i_EncryptCountE = $av_EncryptBox[Mod(($av_EncryptBox[$i_EncryptCountC][0] + $av_EncryptBox[$i_EncryptCountD][0]), 256)][0]
$v_EncryptCipherBy = BitXOR(Asc(StringMid($s_EncryptText, $i_EncryptCountA, 1)), $i_EncryptCountE)
$v_EncryptCipher &= Hex($v_EncryptCipherBy, 2)
Next
$s_EncryptText = $v_EncryptCipher
Next
Else
For $i_EncryptCountF = 0 To $i_EncryptLevel Step 1
$i_EncryptCountB = 0
$i_EncryptCountC = ''
$i_EncryptCountD = ''
$i_EncryptCountE = ''
$v_EncryptCipherBy = ''
$v_EncryptCipher = ''
$v_EncryptSwap = ''
$av_EncryptBox = ''
Local $av_EncryptBox[256][2]
For $i_EncryptCountA = 0 To 255
$av_EncryptBox[$i_EncryptCountA][1] = Asc(StringMid($s_EncryptPassword, Mod($i_EncryptCountA, StringLen($s_EncryptPassword)) + 1, 1))
$av_EncryptBox[$i_EncryptCountA][0] = $i_EncryptCountA
Next
For $i_EncryptCountA = 0 To 255
$i_EncryptCountB = Mod(($i_EncryptCountB + $av_EncryptBox[$i_EncryptCountA][0] + $av_EncryptBox[$i_EncryptCountA][1]), 256)
$v_EncryptSwap = $av_EncryptBox[$i_EncryptCountA][0]
$av_EncryptBox[$i_EncryptCountA][0] = $av_EncryptBox[$i_EncryptCountB][0]
$av_EncryptBox[$i_EncryptCountB][0] = $v_EncryptSwap
Next
For $i_EncryptCountA = 1 To StringLen($s_EncryptText) Step 2
$i_EncryptCountC = Mod(($i_EncryptCountC + 1), 256)
$i_EncryptCountD = Mod(($i_EncryptCountD + $av_EncryptBox[$i_EncryptCountC][0]), 256)
$i_EncryptCountE = $av_EncryptBox[Mod(($av_EncryptBox[$i_EncryptCountC][0] + $av_EncryptBox[$i_EncryptCountD][0]), 256)][0]
$v_EncryptCipherBy = BitXOR(Dec(StringMid($s_EncryptText, $i_EncryptCountA, 2)), $i_EncryptCountE)
$v_EncryptCipher = $v_EncryptCipher & Chr($v_EncryptCipherBy)
Next
$s_EncryptText = $v_EncryptCipher
$i_EncryptCountG = ''
$i_EncryptCountH = ''
$v_EncryptModified = ''
For $i_EncryptCountG = 1 To StringLen($s_EncryptText)
If $i_EncryptCountH = StringLen($s_EncryptPassword) Then
$i_EncryptCountH = 1
Else
$i_EncryptCountH += 1
EndIf
$v_EncryptModified &= Chr(BitXOR(Asc(StringMid($s_EncryptText, $i_EncryptCountG, 1)), Asc(StringMid($s_EncryptPassword, $i_EncryptCountH, 1)), 255))
Next
$s_EncryptText = $v_EncryptModified
Next
EndIf
Return $s_EncryptText
EndIf
EndFunc

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Encrypt a string with 100 bytes and post the encrypted length. Is it 400 bytes or just a bit more than 100 bytes?


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yup it is :) but isn't it possible to make it the same size? well almost, maybe just using 2 characeters for 1, instead of 4

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Don't use StringEncrypt at all. It's obsolete and doesn't work well.

Use the Crypt.au3 functions instead.


This wonderful site allows debugging and testing regular expressions (many flavors available). An absolute must have in your bookmarks.
Another excellent RegExp tutorial. Don't forget downloading your copy of up-to-date pcretest.exe and pcregrep.exe here
RegExp tutorial: enough to get started
PCRE v8.33 regexp documentation latest available release and currently implemented in AutoIt beta.

SQLitespeed is another feature-rich premier SQLite manager (includes import/export). Well worth a try.
SQLite Expert (freeware Personal Edition or payware Pro version) is a very useful SQLite database manager.
An excellent eBook covering almost every aspect of SQLite3: a must-read for anyone doing serious work.
SQL tutorial (covers "generic" SQL, but most of it applies to SQLite as well)
A work-in-progress SQLite3 tutorial. Don't miss other LxyzTHW pages!
SQLite official website with full documentation (may be newer than the SQLite library that comes standard with AutoIt)

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ok :) thanks, I will try that

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So i tried to use crypt.au3 instead, but again it generates much more characters per character, so the size will be much bigger:

#include 
Global $ini = @ScriptDir & "file.txt"
$bPassword = StringToBinary("pass")
$bEncdata = _enc("random data")
ConsoleWrite("Encrypted:"&$bEncdata&@CRLF)
FileWrite(@scriptdir & "encrypted.txt", $bEncdata)

Func _enc($idp)
Local $hj, $he
_Crypt_Startup()
$hj = _Crypt_DeriveKey(BinaryToString($bPassword), $CALG_DES)
$he = _Crypt_EncryptData($idp, $hj, $CALG_USERKEY)
_Crypt_DestroyKey($hj)
_Crypt_Shutdown()
Return StringTrimLeft($he,2)
EndFunc

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Not precisely.

Most encryption algorithms are block algorithms. Hence they always produce one or more block of output for any input. You're going to have 0 to maxlength-1 extra bytes depending on input size.

RC4 is not a block algorithm so the output size will always be equal to input size, but it's a very weak encryption.


This wonderful site allows debugging and testing regular expressions (many flavors available). An absolute must have in your bookmarks.
Another excellent RegExp tutorial. Don't forget downloading your copy of up-to-date pcretest.exe and pcregrep.exe here
RegExp tutorial: enough to get started
PCRE v8.33 regexp documentation latest available release and currently implemented in AutoIt beta.

SQLitespeed is another feature-rich premier SQLite manager (includes import/export). Well worth a try.
SQLite Expert (freeware Personal Edition or payware Pro version) is a very useful SQLite database manager.
An excellent eBook covering almost every aspect of SQLite3: a must-read for anyone doing serious work.
SQL tutorial (covers "generic" SQL, but most of it applies to SQLite as well)
A work-in-progress SQLite3 tutorial. Don't miss other LxyzTHW pages!
SQLite official website with full documentation (may be newer than the SQLite library that comes standard with AutoIt)

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Sad when someone can call 128 bit encryption weak lol.


Common sense plays a role in the basics of understanding AutoIt... If you're lacking in that, do us all a favor, and step away from the computer.

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- A different approach.

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Updated: 04/09/2015

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Sad when someone can call 128 bit encryption weak lol.

Key length isn't the only parameter. There are enough insecure uses of RC4 (i.e. WEP) and enough known attacks against it that it isn't to be considered for serious future use.

Granted it will nonetheless keep your love mails secret against most kid sisters! I should have writen "potentially insecure".


This wonderful site allows debugging and testing regular expressions (many flavors available). An absolute must have in your bookmarks.
Another excellent RegExp tutorial. Don't forget downloading your copy of up-to-date pcretest.exe and pcregrep.exe here
RegExp tutorial: enough to get started
PCRE v8.33 regexp documentation latest available release and currently implemented in AutoIt beta.

SQLitespeed is another feature-rich premier SQLite manager (includes import/export). Well worth a try.
SQLite Expert (freeware Personal Edition or payware Pro version) is a very useful SQLite database manager.
An excellent eBook covering almost every aspect of SQLite3: a must-read for anyone doing serious work.
SQL tutorial (covers "generic" SQL, but most of it applies to SQLite as well)
A work-in-progress SQLite3 tutorial. Don't miss other LxyzTHW pages!
SQLite official website with full documentation (may be newer than the SQLite library that comes standard with AutoIt)

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