205 lines
4.1 KiB
Raku
205 lines
4.1 KiB
Raku
#!/usr/local/bin/perl
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#
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# The inner loop instruction sequence and the IP/FP modifications are from
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# Svend Olaf Mikkelsen <svolaf@inet.uni-c.dk>
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# I've added the stuff needed for crypt() but I've not worried about making
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# things perfect.
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#
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push(@INC,"perlasm","../../perlasm");
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require "x86asm.pl";
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&asm_init($ARGV[0],"crypt586.pl");
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$L="edi";
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$R="esi";
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&external_label("des_SPtrans");
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&fcrypt_body("fcrypt_body");
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&asm_finish();
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sub fcrypt_body
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{
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local($name,$do_ip)=@_;
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&function_begin($name,"EXTRN _des_SPtrans:DWORD");
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&comment("");
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&comment("Load the 2 words");
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$ks="ebp";
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&xor( $L, $L);
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&xor( $R, $R);
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&mov($ks,&wparam(1));
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&push(&DWC(25)); # add a variable
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&set_label("start");
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for ($i=0; $i<16; $i+=2)
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{
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&comment("");
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&comment("Round $i");
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&D_ENCRYPT($i,$L,$R,$i*2,$ks,"des_SPtrans","eax","ebx","ecx","edx");
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&comment("");
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&comment("Round ".sprintf("%d",$i+1));
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&D_ENCRYPT($i+1,$R,$L,($i+1)*2,$ks,"des_SPtrans","eax","ebx","ecx","edx");
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}
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&mov("ebx", &swtmp(0));
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&mov("eax", $L);
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&dec("ebx");
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&mov($L, $R);
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&mov($R, "eax");
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&mov(&swtmp(0), "ebx");
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&jnz(&label("start"));
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&comment("");
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&comment("FP");
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&mov("edx",&wparam(0));
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&FP_new($R,$L,"eax",3);
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&mov(&DWP(0,"edx","",0),"eax");
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&mov(&DWP(4,"edx","",0),$L);
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&pop("ecx"); # remove variable
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&function_end($name);
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}
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sub D_ENCRYPT
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{
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local($r,$L,$R,$S,$ks,$desSP,$u,$tmp1,$tmp2,$t)=@_;
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&mov( $u, &wparam(2)); # 2
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&mov( $t, $R);
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&shr( $t, 16); # 1
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&mov( $tmp2, &wparam(3)); # 2
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&xor( $t, $R); # 1
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&and( $u, $t); # 2
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&and( $t, $tmp2); # 2
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&mov( $tmp1, $u);
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&shl( $tmp1, 16); # 1
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&mov( $tmp2, $t);
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&shl( $tmp2, 16); # 1
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&xor( $u, $tmp1); # 2
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&xor( $t, $tmp2); # 2
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&mov( $tmp1, &DWP(&n2a($S*4),$ks,"",0)); # 2
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&xor( $u, $tmp1);
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&mov( $tmp2, &DWP(&n2a(($S+1)*4),$ks,"",0)); # 2
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&xor( $u, $R);
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&xor( $t, $R);
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&xor( $t, $tmp2);
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&and( $u, "0xfcfcfcfc" ); # 2
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&xor( $tmp1, $tmp1); # 1
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&and( $t, "0xcfcfcfcf" ); # 2
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&xor( $tmp2, $tmp2);
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&movb( &LB($tmp1), &LB($u) );
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&movb( &LB($tmp2), &HB($u) );
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&rotr( $t, 4 );
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&mov( $ks, &DWP(" $desSP",$tmp1,"",0));
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&movb( &LB($tmp1), &LB($t) );
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&xor( $L, $ks);
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&mov( $ks, &DWP("0x200+$desSP",$tmp2,"",0));
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&xor( $L, $ks);
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&movb( &LB($tmp2), &HB($t) );
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&shr( $u, 16);
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&mov( $ks, &DWP("0x100+$desSP",$tmp1,"",0));
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&xor( $L, $ks);
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&movb( &LB($tmp1), &HB($u) );
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&shr( $t, 16);
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&mov( $ks, &DWP("0x300+$desSP",$tmp2,"",0));
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&xor( $L, $ks);
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&mov( $ks, &wparam(1));
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&movb( &LB($tmp2), &HB($t) );
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&and( $u, "0xff" );
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&and( $t, "0xff" );
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&mov( $tmp1, &DWP("0x600+$desSP",$tmp1,"",0));
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&xor( $L, $tmp1);
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&mov( $tmp1, &DWP("0x700+$desSP",$tmp2,"",0));
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&xor( $L, $tmp1);
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&mov( $tmp1, &DWP("0x400+$desSP",$u,"",0));
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&xor( $L, $tmp1);
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&mov( $tmp1, &DWP("0x500+$desSP",$t,"",0));
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&xor( $L, $tmp1);
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}
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sub n2a
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{
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sprintf("%d",$_[0]);
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}
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# now has a side affect of rotating $a by $shift
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sub R_PERM_OP
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{
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local($a,$b,$tt,$shift,$mask,$last)=@_;
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&rotl( $a, $shift ) if ($shift != 0);
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&mov( $tt, $a );
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&xor( $a, $b );
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&and( $a, $mask );
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if ($notlast eq $b)
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{
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&xor( $b, $a );
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&xor( $tt, $a );
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}
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else
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{
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&xor( $tt, $a );
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&xor( $b, $a );
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}
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&comment("");
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}
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sub IP_new
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{
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local($l,$r,$tt,$lr)=@_;
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&R_PERM_OP($l,$r,$tt, 4,"0xf0f0f0f0",$l);
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&R_PERM_OP($r,$tt,$l,20,"0xfff0000f",$l);
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&R_PERM_OP($l,$tt,$r,14,"0x33333333",$r);
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&R_PERM_OP($tt,$r,$l,22,"0x03fc03fc",$r);
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&R_PERM_OP($l,$r,$tt, 9,"0xaaaaaaaa",$r);
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if ($lr != 3)
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{
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if (($lr-3) < 0)
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{ &rotr($tt, 3-$lr); }
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else { &rotl($tt, $lr-3); }
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}
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if ($lr != 2)
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{
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if (($lr-2) < 0)
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{ &rotr($r, 2-$lr); }
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else { &rotl($r, $lr-2); }
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}
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}
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sub FP_new
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{
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local($l,$r,$tt,$lr)=@_;
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if ($lr != 2)
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{
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if (($lr-2) < 0)
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{ &rotl($r, 2-$lr); }
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else { &rotr($r, $lr-2); }
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}
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if ($lr != 3)
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{
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if (($lr-3) < 0)
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{ &rotl($l, 3-$lr); }
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else { &rotr($l, $lr-3); }
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}
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&R_PERM_OP($l,$r,$tt, 0,"0xaaaaaaaa",$r);
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&R_PERM_OP($tt,$r,$l,23,"0x03fc03fc",$r);
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&R_PERM_OP($l,$r,$tt,10,"0x33333333",$l);
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&R_PERM_OP($r,$tt,$l,18,"0xfff0000f",$l);
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&R_PERM_OP($l,$tt,$r,12,"0xf0f0f0f0",$r);
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&rotr($tt , 4);
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}
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