crypt586.pl revision 55714
155714Skris#!/usr/local/bin/perl 255714Skris# 355714Skris# The inner loop instruction sequence and the IP/FP modifications are from 455714Skris# Svend Olaf Mikkelsen <svolaf@inet.uni-c.dk> 555714Skris# I've added the stuff needed for crypt() but I've not worried about making 655714Skris# things perfect. 755714Skris# 855714Skris 955714Skrispush(@INC,"perlasm","../../perlasm"); 1055714Skrisrequire "x86asm.pl"; 1155714Skris 1255714Skris&asm_init($ARGV[0],"crypt586.pl"); 1355714Skris 1455714Skris$L="edi"; 1555714Skris$R="esi"; 1655714Skris 1755714Skris&external_label("des_SPtrans"); 1855714Skris&fcrypt_body("fcrypt_body"); 1955714Skris&asm_finish(); 2055714Skris 2155714Skrissub fcrypt_body 2255714Skris { 2355714Skris local($name,$do_ip)=@_; 2455714Skris 2555714Skris &function_begin($name,"EXTRN _des_SPtrans:DWORD"); 2655714Skris 2755714Skris &comment(""); 2855714Skris &comment("Load the 2 words"); 2955714Skris $ks="ebp"; 3055714Skris 3155714Skris &xor( $L, $L); 3255714Skris &xor( $R, $R); 3355714Skris &mov($ks,&wparam(1)); 3455714Skris 3555714Skris &push(&DWC(25)); # add a variable 3655714Skris 3755714Skris &set_label("start"); 3855714Skris for ($i=0; $i<16; $i+=2) 3955714Skris { 4055714Skris &comment(""); 4155714Skris &comment("Round $i"); 4255714Skris &D_ENCRYPT($i,$L,$R,$i*2,$ks,"des_SPtrans","eax","ebx","ecx","edx"); 4355714Skris 4455714Skris &comment(""); 4555714Skris &comment("Round ".sprintf("%d",$i+1)); 4655714Skris &D_ENCRYPT($i+1,$R,$L,($i+1)*2,$ks,"des_SPtrans","eax","ebx","ecx","edx"); 4755714Skris } 4855714Skris &mov("ebx", &swtmp(0)); 4955714Skris &mov("eax", $L); 5055714Skris &dec("ebx"); 5155714Skris &mov($L, $R); 5255714Skris &mov($R, "eax"); 5355714Skris &mov(&swtmp(0), "ebx"); 5455714Skris &jnz(&label("start")); 5555714Skris 5655714Skris &comment(""); 5755714Skris &comment("FP"); 5855714Skris &mov("edx",&wparam(0)); 5955714Skris 6055714Skris &FP_new($R,$L,"eax",3); 6155714Skris &mov(&DWP(0,"edx","",0),"eax"); 6255714Skris &mov(&DWP(4,"edx","",0),$L); 6355714Skris 6455714Skris &pop("ecx"); # remove variable 6555714Skris 6655714Skris &function_end($name); 6755714Skris } 6855714Skris 6955714Skrissub D_ENCRYPT 7055714Skris { 7155714Skris local($r,$L,$R,$S,$ks,$desSP,$u,$tmp1,$tmp2,$t)=@_; 7255714Skris 7355714Skris &mov( $u, &wparam(2)); # 2 7455714Skris &mov( $t, $R); 7555714Skris &shr( $t, 16); # 1 7655714Skris &mov( $tmp2, &wparam(3)); # 2 7755714Skris &xor( $t, $R); # 1 7855714Skris 7955714Skris &and( $u, $t); # 2 8055714Skris &and( $t, $tmp2); # 2 8155714Skris 8255714Skris &mov( $tmp1, $u); 8355714Skris &shl( $tmp1, 16); # 1 8455714Skris &mov( $tmp2, $t); 8555714Skris &shl( $tmp2, 16); # 1 8655714Skris &xor( $u, $tmp1); # 2 8755714Skris &xor( $t, $tmp2); # 2 8855714Skris &mov( $tmp1, &DWP(&n2a($S*4),$ks,"",0)); # 2 8955714Skris &xor( $u, $tmp1); 9055714Skris &mov( $tmp2, &DWP(&n2a(($S+1)*4),$ks,"",0)); # 2 9155714Skris &xor( $u, $R); 9255714Skris &xor( $t, $R); 9355714Skris &xor( $t, $tmp2); 9455714Skris 9555714Skris &and( $u, "0xfcfcfcfc" ); # 2 9655714Skris &xor( $tmp1, $tmp1); # 1 9755714Skris &and( $t, "0xcfcfcfcf" ); # 2 9855714Skris &xor( $tmp2, $tmp2); 9955714Skris &movb( &LB($tmp1), &LB($u) ); 10055714Skris &movb( &LB($tmp2), &HB($u) ); 10155714Skris &rotr( $t, 4 ); 10255714Skris &mov( $ks, &DWP(" $desSP",$tmp1,"",0)); 10355714Skris &movb( &LB($tmp1), &LB($t) ); 10455714Skris &xor( $L, $ks); 10555714Skris &mov( $ks, &DWP("0x200+$desSP",$tmp2,"",0)); 10655714Skris &xor( $L, $ks); 10755714Skris &movb( &LB($tmp2), &HB($t) ); 10855714Skris &shr( $u, 16); 10955714Skris &mov( $ks, &DWP("0x100+$desSP",$tmp1,"",0)); 11055714Skris &xor( $L, $ks); 11155714Skris &movb( &LB($tmp1), &HB($u) ); 11255714Skris &shr( $t, 16); 11355714Skris &mov( $ks, &DWP("0x300+$desSP",$tmp2,"",0)); 11455714Skris &xor( $L, $ks); 11555714Skris &mov( $ks, &wparam(1)); 11655714Skris &movb( &LB($tmp2), &HB($t) ); 11755714Skris &and( $u, "0xff" ); 11855714Skris &and( $t, "0xff" ); 11955714Skris &mov( $tmp1, &DWP("0x600+$desSP",$tmp1,"",0)); 12055714Skris &xor( $L, $tmp1); 12155714Skris &mov( $tmp1, &DWP("0x700+$desSP",$tmp2,"",0)); 12255714Skris &xor( $L, $tmp1); 12355714Skris &mov( $tmp1, &DWP("0x400+$desSP",$u,"",0)); 12455714Skris &xor( $L, $tmp1); 12555714Skris &mov( $tmp1, &DWP("0x500+$desSP",$t,"",0)); 12655714Skris &xor( $L, $tmp1); 12755714Skris } 12855714Skris 12955714Skrissub n2a 13055714Skris { 13155714Skris sprintf("%d",$_[0]); 13255714Skris } 13355714Skris 13455714Skris# now has a side affect of rotating $a by $shift 13555714Skrissub R_PERM_OP 13655714Skris { 13755714Skris local($a,$b,$tt,$shift,$mask,$last)=@_; 13855714Skris 13955714Skris &rotl( $a, $shift ) if ($shift != 0); 14055714Skris &mov( $tt, $a ); 14155714Skris &xor( $a, $b ); 14255714Skris &and( $a, $mask ); 14355714Skris if ($notlast eq $b) 14455714Skris { 14555714Skris &xor( $b, $a ); 14655714Skris &xor( $tt, $a ); 14755714Skris } 14855714Skris else 14955714Skris { 15055714Skris &xor( $tt, $a ); 15155714Skris &xor( $b, $a ); 15255714Skris } 15355714Skris &comment(""); 15455714Skris } 15555714Skris 15655714Skrissub IP_new 15755714Skris { 15855714Skris local($l,$r,$tt,$lr)=@_; 15955714Skris 16055714Skris &R_PERM_OP($l,$r,$tt, 4,"0xf0f0f0f0",$l); 16155714Skris &R_PERM_OP($r,$tt,$l,20,"0xfff0000f",$l); 16255714Skris &R_PERM_OP($l,$tt,$r,14,"0x33333333",$r); 16355714Skris &R_PERM_OP($tt,$r,$l,22,"0x03fc03fc",$r); 16455714Skris &R_PERM_OP($l,$r,$tt, 9,"0xaaaaaaaa",$r); 16555714Skris 16655714Skris if ($lr != 3) 16755714Skris { 16855714Skris if (($lr-3) < 0) 16955714Skris { &rotr($tt, 3-$lr); } 17055714Skris else { &rotl($tt, $lr-3); } 17155714Skris } 17255714Skris if ($lr != 2) 17355714Skris { 17455714Skris if (($lr-2) < 0) 17555714Skris { &rotr($r, 2-$lr); } 17655714Skris else { &rotl($r, $lr-2); } 17755714Skris } 17855714Skris } 17955714Skris 18055714Skrissub FP_new 18155714Skris { 18255714Skris local($l,$r,$tt,$lr)=@_; 18355714Skris 18455714Skris if ($lr != 2) 18555714Skris { 18655714Skris if (($lr-2) < 0) 18755714Skris { &rotl($r, 2-$lr); } 18855714Skris else { &rotr($r, $lr-2); } 18955714Skris } 19055714Skris if ($lr != 3) 19155714Skris { 19255714Skris if (($lr-3) < 0) 19355714Skris { &rotl($l, 3-$lr); } 19455714Skris else { &rotr($l, $lr-3); } 19555714Skris } 19655714Skris 19755714Skris &R_PERM_OP($l,$r,$tt, 0,"0xaaaaaaaa",$r); 19855714Skris &R_PERM_OP($tt,$r,$l,23,"0x03fc03fc",$r); 19955714Skris &R_PERM_OP($l,$r,$tt,10,"0x33333333",$l); 20055714Skris &R_PERM_OP($r,$tt,$l,18,"0xfff0000f",$l); 20155714Skris &R_PERM_OP($l,$tt,$r,12,"0xf0f0f0f0",$r); 20255714Skris &rotr($tt , 4); 20355714Skris } 20455714Skris 205