🚀 go-pugleaf

This is the disassembled code of visual c:

Now how to tell in which order the operations are done.

I am not that good in assembler.

45:   void encipher(unsigned long *const v,unsigned long *const w,
46:   const unsigned long *const k)
47:   {
0040B760   push        ebp
0040B761   mov         ebp,esp
0040B763   sub         esp,64h
0040B766   push        ebx
0040B767   push        esi
0040B768   push        edi
0040B769   lea         edi,[ebp-64h]
0040B76C   mov         ecx,19h
0040B771   mov         eax,0CCCCCCCCh
0040B776   rep stos    dword ptr [edi]
48:      register unsigned long       y=v[0],z=v[1],sum=0,delta=0x9E3779B9,
0040B778   mov         eax,dword ptr [ebp+8]
0040B77B   mov         ecx,dword ptr [eax]
0040B77D   mov         dword ptr [ebp-4],ecx
0040B780   mov         edx,dword ptr [ebp+8]
0040B783   mov         eax,dword ptr [edx+4]
0040B786   mov         dword ptr [ebp-8],eax
0040B789   mov         dword ptr [ebp-0Ch],0
0040B790   mov         dword ptr [ebp-10h],9E3779B9h
49:                   a=k[0],b=k[1],c=k[2],d=k[3],n=32;
0040B797   mov         ecx,dword ptr [ebp+10h]
0040B79A   mov         edx,dword ptr [ecx]
0040B79C   mov         dword ptr [ebp-14h],edx
0040B79F   mov         eax,dword ptr [ebp+10h]
0040B7A2   mov         ecx,dword ptr [eax+4]
0040B7A5   mov         dword ptr [ebp-18h],ecx
0040B7A8   mov         edx,dword ptr [ebp+10h]
0040B7AB   mov         eax,dword ptr [edx+8]
0040B7AE   mov         dword ptr [ebp-1Ch],eax
0040B7B1   mov         ecx,dword ptr [ebp+10h]
0040B7B4   mov         edx,dword ptr [ecx+0Ch]
0040B7B7   mov         dword ptr [ebp-20h],edx
0040B7BA   mov         dword ptr [ebp-24h],20h
50:
51:      while(n-->0)
0040B7C1   mov         eax,dword ptr [ebp-24h]
0040B7C4   mov         ecx,dword ptr [ebp-24h]
0040B7C7   sub         ecx,1
0040B7CA   mov         dword ptr [ebp-24h],ecx
0040B7CD   test        eax,eax
0040B7CF   jbe         encipher+0C4h (0040b824)
52:         {
53:         sum += delta;
0040B7D1   mov         edx,dword ptr [ebp-0Ch]
0040B7D4   add         edx,dword ptr [ebp-10h]
0040B7D7   mov         dword ptr [ebp-0Ch],edx
54:         y += (z<<4)+a ^ z+sum ^ (z>>5)+b;
0040B7DA   mov         eax,dword ptr [ebp-8]
0040B7DD   shl         eax,4
0040B7E0   add         eax,dword ptr [ebp-14h]
0040B7E3   mov         ecx,dword ptr [ebp-8]
0040B7E6   add         ecx,dword ptr [ebp-0Ch]
0040B7E9   xor         eax,ecx
0040B7EB   mov         edx,dword ptr [ebp-8]
0040B7EE   shr         edx,5
0040B7F1   add         edx,dword ptr [ebp-18h]
0040B7F4   xor         eax,edx
0040B7F6   mov         ecx,dword ptr [ebp-4]
0040B7F9   add         ecx,eax
0040B7FB   mov         dword ptr [ebp-4],ecx
55:         z += (y<<4)+c ^ y+sum ^ (y>>5)+d;
0040B7FE   mov         edx,dword ptr [ebp-4]
0040B801   shl         edx,4
0040B804   add         edx,dword ptr [ebp-1Ch]
0040B807   mov         eax,dword ptr [ebp-4]
0040B80A   add         eax,dword ptr [ebp-0Ch]
0040B80D   xor         edx,eax
0040B80F   mov         ecx,dword ptr [ebp-4]
0040B812   shr         ecx,5
0040B815   add         ecx,dword ptr [ebp-20h]
0040B818   xor         edx,ecx
0040B81A   mov         eax,dword ptr [ebp-8]
0040B81D   add         eax,edx
0040B81F   mov         dword ptr [ebp-8],eax
56:         }
0040B822   jmp         encipher+61h (0040b7c1)
57:
58:      w[0]=y; w[1]=z;
0040B824   mov         ecx,dword ptr [ebp+0Ch]
0040B827   mov         edx,dword ptr [ebp-4]
0040B82A   mov         dword ptr [ecx],edx
0040B82C   mov         eax,dword ptr [ebp+0Ch]
0040B82F   mov         ecx,dword ptr [ebp-8]
0040B832   mov         dword ptr [eax+4],ecx
59:   }
0040B835   pop         edi
0040B836   pop         esi
0040B837   pop         ebx
0040B838   mov         esp,ebp
0040B83A   pop         ebp
0040B83B   ret



"skybuck" <skybuck2000@hotmail.com> wrote in message
news:65fc3031.0208261208.6199fcc1@posting.google.com...
> disastry@saiknes.lv.NO.SPaM.NET wrote in message
news:<3D69F6F6.E43591E6@saiknes.lv.NO.SPaM.NET>...
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: RIPEMD160
> >
> > skybuck wrote:
> > > The problems are probably with these lines of code:
>
> For those that don't what the problem might be... compilers create
> temporarely variables to store the sub results of the calculation of
> these lines of code.
> Apperently... compiler do that differently...
>
>
> > > c version:
> > >
> > > y += (z<<4)+a ^ z+sum ^ (z>>5)+b;
> > > z += (y<<4)+c ^ y+sum ^ (y>>5)+d;
> > >
> > > pascal version:
> > >
> > > y := y + (z shl 4) + a xor z + _sum xor (z shr 5) + b;
> > > z := z + (y shl 4) + c xor y + _sum xor (y shr 5) + d;
> >
> > 1) try:
> >   y := y + ((z shl 4) + a xor z + _sum xor (z shr 5) + b);
>
> Nope, I tried this one, it doesn't work in delphi 6.
>
>
>
> > or even
> >   y := y + (((z shl 4) + a) xor (z + _sum) xor ((z shr 5) + b));
> >
>
> Nope, this one also doesn't work in delphi.
>
> > 2) better use XTEA (aka (TEAN)
>
> Hmm.. what's that... I go check it out :)
>
> > __
> > Disastry  http://disastry.dhs.org/
> > http://disastry.dhs.org/pgp <----PGP plugins for Netscape and MDaemon
> >  ^----PGP 2.6.3ia-multi06 (supports IDEA, CAST5, BLOWFISH, TWOFISH,
> >       AES, 3DES ciphers and MD5, SHA1, RIPEMD160, SHA2 hashes)
> > -----BEGIN PGP SIGNATURE-----
> > Version: Netscape PGP half-Plugin 0.15 by Disastry / PGPsdk v1.7.1
> >
> > iQA/AwUBPWnayDBaTVEuJQxkEQMpGACfZIT4l3qmDgc6vFEefc8IaltkSfAAoLXz
> > hQBQJElRGLhZ0OyB59/rQvpn
> > =ouN1
> > -----END PGP SIGNATURE-----