#!/usr/local/bin/perl # # The inner loop instruction sequence and the IP/FP modifications are from # Svend Olaf Mikkelsen <svolaf@inet.uni-c.dk> # push(@INC,"perlasm","../../perlasm"); require "x86asm.pl"; require "cbc.pl"; require "desboth.pl"; # base code is in microsft # op dest, source # format. # &asm_init($ARGV[0],"des-586.pl"); $L="edi"; $R="esi"; &external_label("DES_SPtrans"); &DES_encrypt("DES_encrypt1",1); &DES_encrypt("DES_encrypt2",0); &DES_encrypt3("DES_encrypt3",1); &DES_encrypt3("DES_decrypt3",0); &cbc("DES_ncbc_encrypt","DES_encrypt1","DES_encrypt1",0,4,5,3,5,-1); &cbc("DES_ede3_cbc_encrypt","DES_encrypt3","DES_decrypt3",0,6,7,3,4,5); &asm_finish(); sub DES_encrypt { local($name,$do_ip)=@_; &function_begin_B($name,"EXTRN _DES_SPtrans:DWORD"); &push("esi"); &push("edi"); &comment(""); &comment("Load the 2 words"); $trans="ebp"; if ($do_ip) { &mov($R,&wparam(0)); &xor( "ecx", "ecx" ); &push("ebx"); &push("ebp"); &mov("eax",&DWP(0,$R,"",0)); &mov("ebx",&wparam(2)); # get encrypt flag &mov($L,&DWP(4,$R,"",0)); &comment(""); &comment("IP"); &IP_new("eax",$L,$R,3); } else { &mov("eax",&wparam(0)); &xor( "ecx", "ecx" ); &push("ebx"); &push("ebp"); &mov($R,&DWP(0,"eax","",0)); &mov("ebx",&wparam(2)); # get encrypt flag &rotl($R,3); &mov($L,&DWP(4,"eax","",0)); &rotl($L,3); } # PIC-ification:-) &picmeup($trans,"DES_SPtrans"); #if ($cpp) { &picmeup($trans,"DES_SPtrans"); } #else { &lea($trans,&DWP("DES_SPtrans")); } &mov( "ecx", &wparam(1) ); &cmp("ebx","0"); &je(&label("start_decrypt")); for ($i=0; $i<16; $i+=2) { &comment(""); &comment("Round $i"); &D_ENCRYPT($i,$L,$R,$i*2,$trans,"eax","ebx","ecx","edx"); &comment(""); &comment("Round ".sprintf("%d",$i+1)); &D_ENCRYPT($i+1,$R,$L,($i+1)*2,$trans,"eax","ebx","ecx","edx"); } &jmp(&label("end")); &set_label("start_decrypt"); for ($i=15; $i>0; $i-=2) { &comment(""); &comment("Round $i"); &D_ENCRYPT(15-$i,$L,$R,$i*2,$trans,"eax","ebx","ecx","edx"); &comment(""); &comment("Round ".sprintf("%d",$i-1)); &D_ENCRYPT(15-$i+1,$R,$L,($i-1)*2,$trans,"eax","ebx","ecx","edx"); } &set_label("end"); if ($do_ip) { &comment(""); &comment("FP"); &mov("edx",&wparam(0)); &FP_new($L,$R,"eax",3); &mov(&DWP(0,"edx","",0),"eax"); &mov(&DWP(4,"edx","",0),$R); } else { &comment(""); &comment("Fixup"); &rotr($L,3); # r &mov("eax",&wparam(0)); &rotr($R,3); # l &mov(&DWP(0,"eax","",0),$L); &mov(&DWP(4,"eax","",0),$R); } &pop("ebp"); &pop("ebx"); &pop("edi"); &pop("esi"); &ret(); &function_end_B($name); } sub D_ENCRYPT { local($r,$L,$R,$S,$trans,$u,$tmp1,$tmp2,$t)=@_; &mov( $u, &DWP(&n2a($S*4),$tmp2,"",0)); &xor( $tmp1, $tmp1); &mov( $t, &DWP(&n2a(($S+1)*4),$tmp2,"",0)); &xor( $u, $R); &xor( $tmp2, $tmp2); &xor( $t, $R); &and( $u, "0xfcfcfcfc" ); &and( $t, "0xcfcfcfcf" ); &movb( &LB($tmp1), &LB($u) ); &movb( &LB($tmp2), &HB($u) ); &rotr( $t, 4 ); &xor( $L, &DWP(" ",$trans,$tmp1,0)); &movb( &LB($tmp1), &LB($t) ); &xor( $L, &DWP("0x200",$trans,$tmp2,0)); &movb( &LB($tmp2), &HB($t) ); &shr( $u, 16); &xor( $L, &DWP("0x100",$trans,$tmp1,0)); &movb( &LB($tmp1), &HB($u) ); &shr( $t, 16); &xor( $L, &DWP("0x300",$trans,$tmp2,0)); &movb( &LB($tmp2), &HB($t) ); &and( $u, "0xff" ); &and( $t, "0xff" ); &xor( $L, &DWP("0x600",$trans,$tmp1,0)); &xor( $L, &DWP("0x700",$trans,$tmp2,0)); &mov( $tmp2, &wparam(1) ); &xor( $L, &DWP("0x400",$trans,$u,0)); &xor( $L, &DWP("0x500",$trans,$t,0)); } sub n2a { sprintf("%d",$_[0]); } # now has a side affect of rotating $a by $shift sub R_PERM_OP { local($a,$b,$tt,$shift,$mask,$last)=@_; &rotl( $a, $shift ) if ($shift != 0); &mov( $tt, $a ); &xor( $a, $b ); &and( $a, $mask ); # This can never succeed, and besides it is difficult to see what the # idea was - Ben 13 Feb 99 if (!$last eq $b) { &xor( $b, $a ); &xor( $tt, $a ); } else { &xor( $tt, $a ); &xor( $b, $a ); } &comment(""); } sub IP_new { local($l,$r,$tt,$lr)=@_; &R_PERM_OP($l,$r,$tt, 4,"0xf0f0f0f0",$l); &R_PERM_OP($r,$tt,$l,20,"0xfff0000f",$l); &R_PERM_OP($l,$tt,$r,14,"0x33333333",$r); &R_PERM_OP($tt,$r,$l,22,"0x03fc03fc",$r); &R_PERM_OP($l,$r,$tt, 9,"0xaaaaaaaa",$r); if ($lr != 3) { if (($lr-3) < 0) { &rotr($tt, 3-$lr); } else { &rotl($tt, $lr-3); } } if ($lr != 2) { if (($lr-2) < 0) { &rotr($r, 2-$lr); } else { &rotl($r, $lr-2); } } } sub FP_new { local($l,$r,$tt,$lr)=@_; if ($lr != 2) { if (($lr-2) < 0) { &rotl($r, 2-$lr); } else { &rotr($r, $lr-2); } } if ($lr != 3) { if (($lr-3) < 0) { &rotl($l, 3-$lr); } else { &rotr($l, $lr-3); } } &R_PERM_OP($l,$r,$tt, 0,"0xaaaaaaaa",$r); &R_PERM_OP($tt,$r,$l,23,"0x03fc03fc",$r); &R_PERM_OP($l,$r,$tt,10,"0x33333333",$l); &R_PERM_OP($r,$tt,$l,18,"0xfff0000f",$l); &R_PERM_OP($l,$tt,$r,12,"0xf0f0f0f0",$r); &rotr($tt , 4); }