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209 lines
4.3 KiB
209 lines
4.3 KiB
#!/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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$0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1; |
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push(@INC,"${dir}","${dir}../../perlasm"); |
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require "x86asm.pl"; |
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&asm_init($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($name); |
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&comment(""); |
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&comment("Load the 2 words"); |
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$trans="ebp"; |
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&xor( $L, $L); |
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&xor( $R, $R); |
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# PIC-ification:-) |
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&picmeup("edx","DES_SPtrans"); |
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#if ($cpp) { &picmeup("edx","DES_SPtrans"); } |
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#else { &lea("edx",&DWP("DES_SPtrans")); } |
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&push("edx"); # becomes &swtmp(1) |
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# |
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&mov($trans,&wparam(1)); # reloaded with DES_SPtrans in D_ENCRYPT |
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&push(&DWC(25)); # add a variable |
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&set_label("start"); |
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for ($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,$i*2,$trans,"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,($i+1)*2,$trans,"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),$L); |
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&add("esp",8); # remove variables |
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&function_end($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,$trans,$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),$trans,"",0)); # 2 |
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&xor( $u, $tmp1); |
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&mov( $tmp2, &DWP(&n2a(($S+1)*4),$trans,"",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( $trans, &swtmp(1)); |
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&xor( $L, &DWP(" ",$trans,$tmp1,0)); |
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&movb( &LB($tmp1), &LB($t) ); |
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&xor( $L, &DWP("0x200",$trans,$tmp2,0)); |
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&movb( &LB($tmp2), &HB($t) ); |
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&shr( $u, 16); |
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&xor( $L, &DWP("0x100",$trans,$tmp1,0)); |
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&movb( &LB($tmp1), &HB($u) ); |
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&shr( $t, 16); |
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&xor( $L, &DWP("0x300",$trans,$tmp2,0)); |
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&movb( &LB($tmp2), &HB($t) ); |
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&and( $u, "0xff" ); |
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&and( $t, "0xff" ); |
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&mov( $tmp1, &DWP("0x600",$trans,$tmp1,0)); |
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&xor( $L, $tmp1); |
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&mov( $tmp1, &DWP("0x700",$trans,$tmp2,0)); |
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&xor( $L, $tmp1); |
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&mov( $tmp1, &DWP("0x400",$trans,$u,0)); |
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&xor( $L, $tmp1); |
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&mov( $tmp1, &DWP("0x500",$trans,$t,0)); |
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&xor( $L, $tmp1); |
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&mov( $trans, &wparam(1)); |
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} |
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sub n2a |
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{ |
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sprintf("%d",$_[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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