#! /usr/bin/env perl # Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. # # Licensed under the OpenSSL license (the "License"). You may not use # this file except in compliance with the License. You can obtain a copy # in the file LICENSE in the source distribution or at # https://www.openssl.org/source/license.html # The inner loop instruction sequence and the IP/FP modifications are from # Svend Olaf Mikkelsen $0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1; push(@INC,"${dir}","${dir}../../perlasm"); require "x86asm.pl"; $output=pop; open STDOUT,">$output"; &asm_init($ARGV[0],"crypt586.pl"); $L="edi"; $R="esi"; &external_label("DES_SPtrans"); &fcrypt_body("fcrypt_body"); &asm_finish(); close STDOUT; sub fcrypt_body { local($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); }