--- /dev/null
+#!/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);
+ }
+
projects / cassiopeia.git / blobdiff