| #!/usr/local/bin/perl |
| # |
| # The inner loop instruction sequence and the IP/FP modifications are from |
| # Svend Olaf Mikkelsen <svolaf@inet.uni-c.dk> |
| # I've added the stuff needed for crypt() but I've not worried about making |
| # things perfect. |
| # |
| |
| $0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1; |
| push(@INC,"${dir}","${dir}../../perlasm"); |
| require "x86asm.pl"; |
| |
| &asm_init($ARGV[0],"crypt586.pl"); |
| |
| $L="edi"; |
| $R="esi"; |
| |
| &external_label("DES_SPtrans"); |
| &fcrypt_body("fcrypt_body"); |
| &asm_finish(); |
| |
| sub fcrypt_body |
| { |
| local($name,$do_ip)=@_; |
| |
| &function_begin($name); |
| |
| &comment(""); |
| &comment("Load the 2 words"); |
| $trans="ebp"; |
| |
| &xor( $L, $L); |
| &xor( $R, $R); |
| |
| # PIC-ification:-) |
| &picmeup("edx","DES_SPtrans"); |
| #if ($cpp) { &picmeup("edx","DES_SPtrans"); } |
| #else { &lea("edx",&DWP("DES_SPtrans")); } |
| &push("edx"); # becomes &swtmp(1) |
| # |
| &mov($trans,&wparam(1)); # reloaded with DES_SPtrans in D_ENCRYPT |
| |
| &push(&DWC(25)); # add a variable |
| |
| &set_label("start"); |
| for ($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"); |
| } |
| &mov("ebx", &swtmp(0)); |
| &mov("eax", $L); |
| &dec("ebx"); |
| &mov($L, $R); |
| &mov($R, "eax"); |
| &mov(&swtmp(0), "ebx"); |
| &jnz(&label("start")); |
| |
| &comment(""); |
| &comment("FP"); |
| &mov("edx",&wparam(0)); |
| |
| &FP_new($R,$L,"eax",3); |
| &mov(&DWP(0,"edx","",0),"eax"); |
| &mov(&DWP(4,"edx","",0),$L); |
| |
| &add("esp",8); # remove variables |
| |
| &function_end($name); |
| } |
| |
| sub D_ENCRYPT |
| { |
| local($r,$L,$R,$S,$trans,$u,$tmp1,$tmp2,$t)=@_; |
| |
| &mov( $u, &wparam(2)); # 2 |
| &mov( $t, $R); |
| &shr( $t, 16); # 1 |
| &mov( $tmp2, &wparam(3)); # 2 |
| &xor( $t, $R); # 1 |
| |
| &and( $u, $t); # 2 |
| &and( $t, $tmp2); # 2 |
| |
| &mov( $tmp1, $u); |
| &shl( $tmp1, 16); # 1 |
| &mov( $tmp2, $t); |
| &shl( $tmp2, 16); # 1 |
| &xor( $u, $tmp1); # 2 |
| &xor( $t, $tmp2); # 2 |
| &mov( $tmp1, &DWP(&n2a($S*4),$trans,"",0)); # 2 |
| &xor( $u, $tmp1); |
| &mov( $tmp2, &DWP(&n2a(($S+1)*4),$trans,"",0)); # 2 |
| &xor( $u, $R); |
| &xor( $t, $R); |
| &xor( $t, $tmp2); |
| |
| &and( $u, "0xfcfcfcfc" ); # 2 |
| &xor( $tmp1, $tmp1); # 1 |
| &and( $t, "0xcfcfcfcf" ); # 2 |
| &xor( $tmp2, $tmp2); |
| &movb( &LB($tmp1), &LB($u) ); |
| &movb( &LB($tmp2), &HB($u) ); |
| &rotr( $t, 4 ); |
| &mov( $trans, &swtmp(1)); |
| &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" ); |
| &mov( $tmp1, &DWP("0x600",$trans,$tmp1,0)); |
| &xor( $L, $tmp1); |
| &mov( $tmp1, &DWP("0x700",$trans,$tmp2,0)); |
| &xor( $L, $tmp1); |
| &mov( $tmp1, &DWP("0x400",$trans,$u,0)); |
| &xor( $L, $tmp1); |
| &mov( $tmp1, &DWP("0x500",$trans,$t,0)); |
| &xor( $L, $tmp1); |
| &mov( $trans, &wparam(1)); |
| } |
| |
| sub n2a |
| { |
| sprintf("%d",$_[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, $mask ); |
| if ($notlast 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); |
| } |
| |