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Date: Thu, 18 Sep 2014 16:06:09 +0400
From: Roman Rusakov <rusakovster@...il.com>
To: john-users@...ts.openwall.com
Subject: Re: nVidia Maxwell support (especially descrypt)?

Good day.

I started work to optimize bitslice DES sboxes for Nvidia Maxwell
instruction set (particularly for LOP3.LUT).
Looks like gate count can be decreased by 9 (from ~33 to 24).
For example, S4 (only 17 gates).
===
#include <stdio.h>

typedef unsigned long long vtype;

vtype lut3(vtype x,vtype y,vtype z,unsigned char m)
{
    int i;
    vtype r=0;
    for(i=0;i<sizeof(vtype)*8;i++)
r|=(vtype)((m>>( (((x>>i)&1)<<2) | (((y>>i)&1)<<1) | ((z>>i)&1) ))&1) << i;
    return r;
}

void s4(vtype a1, vtype a2, vtype a3, vtype a4, vtype a5, vtype a6,
    vtype * out1, vtype * out2, vtype * out3, vtype * out4)
{
    vtype x55AAFF00=lut3(a1,a4,a5,0x36);
    vtype x00F00F00=lut3(a3,a4,a5,0x24);
    vtype x1926330C=lut3(a2,a3,x55AAFF00,0xA4);
    vtype x4CA36B59=lut3(x00F00F00,a1,x1926330C,0xB6);

    vtype x00FF55AA=lut3(a1,a4,a5,0x6C);
    vtype x3FCC6E9D=lut3(a2,a3,x00FF55AA,0x5E);
    vtype x6A7935C8=lut3(a1,x00F00F00,x3FCC6E9D,0xD6);

    vtype x5D016B55=lut3(a1,x4CA36B59,x00FF55AA,0xD4);
    vtype x07AE9F5A=lut3(a3,x55AAFF00,x5D016B55,0xD6);
    vtype x61C8F93C=lut3(a1,a2,x07AE9F5A,0x96);

    vtype x3=lut3(a6,x4CA36B59,x61C8F93C,0xC9);
    vtype x4=lut3(a6,x4CA36B59,x61C8F93C,0x93);
    *out3^=x3;
    *out4^=x4;

    vtype x26DA5E91=x4CA36B59^x6A7935C8;
    vtype x37217F22=lut3(a2,a4,x26DA5E91,0x72);
    vtype x56E9861E=x37217F22^x61C8F93C;

    vtype x1=lut3(a6,x56E9861E,x6A7935C8,0x5C);
    vtype x2=lut3(a6,x56E9861E,x6A7935C8,0x35);
    *out1^=x1;
    *out2^=x2;
}

void main()
{
    vtype a1,a2,a3,a4,a5,a6,x1,x2,x3,x4;
    a1=0x5555555555555555;
    a2=0x3333333333333333;
    a3=0x0F0F0F0F0F0F0F0F;
    a4=0x00FF00FF00FF00FF;
    a5=0x0000FFFF0000FFFF;
    a6=0x00000000FFFFFFFF;
    x1=x2=x3=x4=0;
    s4(a1,a2,a3,a4,a5,a6,&x1,&x2,&x3,&x4);
    printf("%016llX\n",x1);
    printf("%016llX\n",x2);
    printf("%016llX\n",x3);
    printf("%016llX\n",x4);
}
===

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