253 lines
5 KiB
Raku
253 lines
5 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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#
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push(@INC,"perlasm","../../perlasm");
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require "x86asm.pl";
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require "cbc.pl";
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require "desboth.pl";
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# base code is in microsft
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# op dest, source
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# format.
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#
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&asm_init($ARGV[0],"des-586.pl");
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$L="edi";
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$R="esi";
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&external_label("des_SPtrans");
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&des_encrypt("des_encrypt1",1);
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&des_encrypt("des_encrypt2",0);
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&des_encrypt3("des_encrypt3",1);
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&des_encrypt3("des_decrypt3",0);
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&cbc("des_ncbc_encrypt","des_encrypt1","des_encrypt1",0,4,5,3,5,-1);
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&cbc("des_ede3_cbc_encrypt","des_encrypt3","des_decrypt3",0,6,7,3,4,5);
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&asm_finish();
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sub des_encrypt
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{
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local($name,$do_ip)=@_;
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&function_begin_B($name,"EXTRN _des_SPtrans:DWORD");
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&push("esi");
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&push("edi");
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&comment("");
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&comment("Load the 2 words");
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$ks="ebp";
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if ($do_ip)
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{
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&mov($R,&wparam(0));
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&xor( "ecx", "ecx" );
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&push("ebx");
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&push("ebp");
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&mov("eax",&DWP(0,$R,"",0));
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&mov("ebx",&wparam(2)); # get encrypt flag
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&mov($L,&DWP(4,$R,"",0));
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&comment("");
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&comment("IP");
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&IP_new("eax",$L,$R,3);
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}
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else
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{
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&mov("eax",&wparam(0));
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&xor( "ecx", "ecx" );
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&push("ebx");
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&push("ebp");
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&mov($R,&DWP(0,"eax","",0));
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&mov("ebx",&wparam(2)); # get encrypt flag
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&rotl($R,3);
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&mov($L,&DWP(4,"eax","",0));
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&rotl($L,3);
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}
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&mov( $ks, &wparam(1) );
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&cmp("ebx","0");
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&je(&label("start_decrypt"));
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for ($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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&jmp(&label("end"));
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&set_label("start_decrypt");
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for ($i=15; $i>0; $i-=2)
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{
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&comment("");
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&comment("Round $i");
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&D_ENCRYPT(15-$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",$i-1));
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&D_ENCRYPT(15-$i+1,$R,$L,($i-1)*2,$ks,"des_SPtrans","eax","ebx","ecx","edx");
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}
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&set_label("end");
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if ($do_ip)
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{
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&comment("");
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&comment("FP");
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&mov("edx",&wparam(0));
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&FP_new($L,$R,"eax",3);
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&mov(&DWP(0,"edx","",0),"eax");
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&mov(&DWP(4,"edx","",0),$R);
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}
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else
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{
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&comment("");
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&comment("Fixup");
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&rotr($L,3); # r
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&mov("eax",&wparam(0));
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&rotr($R,3); # l
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&mov(&DWP(0,"eax","",0),$L);
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&mov(&DWP(4,"eax","",0),$R);
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}
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&pop("ebp");
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&pop("ebx");
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&pop("edi");
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&pop("esi");
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&ret();
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&function_end_B($name);
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}
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sub D_ENCRYPT
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{
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local($r,$L,$R,$S,$ks,$desSP,$u,$tmp1,$tmp2,$t)=@_;
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&mov( $u, &DWP(&n2a($S*4),$ks,"",0));
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&xor( $tmp1, $tmp1);
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&mov( $t, &DWP(&n2a(($S+1)*4),$ks,"",0));
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&xor( $u, $R);
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&xor( $t, $R);
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&and( $u, "0xfcfcfcfc" );
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&and( $t, "0xcfcfcfcf" );
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&movb( &LB($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, $mask );
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# This can never succeed, and besides it is difficult to see what the
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# idea was - Ben 13 Feb 99
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if (!$last 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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