| #!/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); |
| } |
| |