Jump to content

reshup

Members
  • Content Count

    2
  • Joined

  • Last visited

Posts posted by reshup


  1.  

    Code-Snippet i got from a friend long ago might be useful ?

    //From: BoB Team-PEiD

     

    Function  GetPolyCrc32(Address : Pointer; Size : DWord) : DWord;
    Asm
    // input:  EAX=data, EDX=size

        PushAD
        XChg    EAX, EDX          // EDX = Address ..
        XChg    EAX, ECX          // ECX = Size ..
    //    Mov     EDX, Buffer
    //    Mov     ECX, NumBytes
        Xor     EAX, EAX

    // input:  EDX=data, ECX=size, EAX=crc
    // output: EAX=crc, EDX+=ECX, ECX=BL=0

        Jecxz   @L4
        Not     EAX
    @L1:
        Xor     AL, [EDX]
        Inc     EDX
        Mov     BL, 8
    @L2:
        Shr     EAX, 1
        Jnc     @L3
        Xor     EAX, $EDB88320
    @L3:
        Dec     BL
        Jnz     @L2
        Loop    @L1
        Not     EAX
    @L4:
        Mov     [ESP + PushAD_EAX], EAX
        PopAD
    End;

×