Basic encryption techniques

[Busted]

Hi all,

I am searching for some basic encryption techniques that I could implement into my Masm code, for example I want to encrypt a primary number that my serial is calculated off.

Cheers Busted

[ghandi]

Can you define the following please? 'basic' & 'encryption'

The following should work as a simple string obfuscation although it is about as safe as a gerbil at a mardi gras after-party. It does fit the bill of 'basic' and 'encryption' though. If you are interested in some real encryption though you could check out Drizz's crypto/hash library where there is a few lgorithms to choose from or you could even mix and match them to make something.

EncryptString PROC uses esi lpDecryptedString:DWORD,lpEncryptedString:DWORD  mov esi,lpDecryptedString
  mov edi,lpEncryptedString  xor ecx,ecx
    jmp @f  .repeat
    rol al,cl
    xor al,0DCh
    stosb
    add ecx,1
  @@:
    movzx eax,byte ptr [esi+ecx]
  .until !eax
  retEncryptString ENDPDecryptString PROC uses esi lpEncryptedString:DWORD, lpDecryptedString:DWORD  mov esi,lpEncryptedString
  mov edi,lpDecryptedString  xor ecx,ecx
    jmp @f  .repeat
    xor al,0DCh
    ror al,cl
    stosb
    add ecx,1
  @@:
    movzx eax,byte ptr [esi+ecx]
  .until !eax
  retDecryptString ENDP

HR,

Ghandi

Edited April 10, 2010 by ghandi

[Accede]

Drizz's crypto/hash library dont work for me i see many many errors on this hash library.

I download this stdlib is one of Drizz's projects listed under software engineering.

stdlib is a collection of "standard" MASM functions for text, file management etc.

Found on this tread http://forum.tuts4you.com/index.php?showtopic=10116

error.bmp