+++ /dev/null
-#!/usr/local/bin/perl
-
-# At some point it became apparent that the original SSLeay RC4
-# assembler implementation performs suboptimaly on latest IA-32
-# microarchitectures. After re-tuning performance has changed as
-# following:
-#
-# Pentium +0%
-# Pentium III +17%
-# AMD +52%(*)
-# P4 +180%(**)
-#
-# (*) This number is actually a trade-off:-) It's possible to
-# achieve +72%, but at the cost of -48% off PIII performance.
-# In other words code performing further 13% faster on AMD
-# would perform almost 2 times slower on Intel PIII...
-# For reference! This code delivers ~80% of rc4-amd64.pl
-# performance on the same Opteron machine.
-# (**) This number requires compressed key schedule set up by
-# RC4_set_key and therefore doesn't apply to 0.9.7 [option for
-# compressed key schedule is implemented in 0.9.8 and later,
-# see commentary section in rc4_skey.c for further details].
-#
-# <appro@fy.chalmers.se>
-
-push(@INC,"perlasm","../../perlasm");
-require "x86asm.pl";
-
-&asm_init($ARGV[0],"rc4-586.pl");
-
-$x="eax";
-$y="ebx";
-$tx="ecx";
-$ty="edx";
-$in="esi";
-$out="edi";
-$d="ebp";
-
-&RC4("RC4");
-
-&asm_finish();
-
-sub RC4_loop
- {
- local($n,$p,$char)=@_;
-
- &comment("Round $n");
-
- if ($char)
- {
- if ($p >= 0)
- {
- &mov($ty, &swtmp(2));
- &cmp($ty, $in);
- &jbe(&label("finished"));
- &inc($in);
- }
- else
- {
- &add($ty, 8);
- &inc($in);
- &cmp($ty, $in);
- &jb(&label("finished"));
- &mov(&swtmp(2), $ty);
- }
- }
- # Moved out
- # &mov( $tx, &DWP(0,$d,$x,4)) if $p < 0;
-
- &add( &LB($y), &LB($tx));
- &mov( $ty, &DWP(0,$d,$y,4));
- # XXX
- &mov( &DWP(0,$d,$x,4),$ty);
- &add( $ty, $tx);
- &mov( &DWP(0,$d,$y,4),$tx);
- &and( $ty, 0xff);
- &inc( &LB($x)); # NEXT ROUND
- &mov( $tx, &DWP(0,$d,$x,4)) if $p < 1; # NEXT ROUND
- &mov( $ty, &DWP(0,$d,$ty,4));
-
- if (!$char)
- {
- #moved up into last round
- if ($p >= 1)
- {
- &add( $out, 8)
- }
- &movb( &BP($n,"esp","",0), &LB($ty));
- }
- else
- {
- # Note in+=8 has occured
- &movb( &HB($ty), &BP(-1,$in,"",0));
- # XXX
- &xorb(&LB($ty), &HB($ty));
- # XXX
- &movb(&BP($n,$out,"",0),&LB($ty));
- }
- }
-
-
-sub RC4
- {
- local($name)=@_;
-
- &function_begin_B($name,"");
-
- &mov($ty,&wparam(1)); # len
- &cmp($ty,0);
- &jne(&label("proceed"));
- &ret();
- &set_label("proceed");
-
- &comment("");
-
- &push("ebp");
- &push("ebx");
- &push("esi");
- &xor( $x, $x); # avoid partial register stalls
- &push("edi");
- &xor( $y, $y); # avoid partial register stalls
- &mov( $d, &wparam(0)); # key
- &mov( $in, &wparam(2));
-
- &movb( &LB($x), &BP(0,$d,"",1));
- &movb( &LB($y), &BP(4,$d,"",1));
-
- &mov( $out, &wparam(3));
- &inc( &LB($x));
-
- &stack_push(3); # 3 temp variables
- &add( $d, 8);
-
- # detect compressed schedule, see commentary section in rc4_skey.c...
- # in 0.9.7 context ~50 bytes below RC4_CHAR label remain redundant,
- # as compressed key schedule is set up in 0.9.8 and later.
- &cmp(&DWP(256,$d),-1);
- &je(&label("RC4_CHAR"));
-
- &lea( $ty, &DWP(-8,$ty,$in));
-
- # check for 0 length input
-
- &mov( &swtmp(2), $ty); # this is now address to exit at
- &mov( $tx, &DWP(0,$d,$x,4));
-
- &cmp( $ty, $in);
- &jb( &label("end")); # less than 8 bytes
-
- &set_label("start");
-
- # filling DELAY SLOT
- &add( $in, 8);
-
- &RC4_loop(0,-1,0);
- &RC4_loop(1,0,0);
- &RC4_loop(2,0,0);
- &RC4_loop(3,0,0);
- &RC4_loop(4,0,0);
- &RC4_loop(5,0,0);
- &RC4_loop(6,0,0);
- &RC4_loop(7,1,0);
-
- &comment("apply the cipher text");
- # xor the cipher data with input
-
- #&add( $out, 8); #moved up into last round
-
- &mov( $tx, &swtmp(0));
- &mov( $ty, &DWP(-8,$in,"",0));
- &xor( $tx, $ty);
- &mov( $ty, &DWP(-4,$in,"",0));
- &mov( &DWP(-8,$out,"",0), $tx);
- &mov( $tx, &swtmp(1));
- &xor( $tx, $ty);
- &mov( $ty, &swtmp(2)); # load end ptr;
- &mov( &DWP(-4,$out,"",0), $tx);
- &mov( $tx, &DWP(0,$d,$x,4));
- &cmp($in, $ty);
- &jbe(&label("start"));
-
- &set_label("end");
-
- # There is quite a bit of extra crap in RC4_loop() for this
- # first round
- &RC4_loop(0,-1,1);
- &RC4_loop(1,0,1);
- &RC4_loop(2,0,1);
- &RC4_loop(3,0,1);
- &RC4_loop(4,0,1);
- &RC4_loop(5,0,1);
- &RC4_loop(6,1,1);
-
- &jmp(&label("finished"));
-
- &align(16);
- # this is essentially Intel P4 specific codepath, see rc4_skey.c,
- # and is engaged in 0.9.8 and later context...
- &set_label("RC4_CHAR");
-
- &lea ($ty,&DWP(0,$in,$ty));
- &mov (&swtmp(2),$ty);
-
- # strangely enough unrolled loop performs over 20% slower...
- &set_label("RC4_CHAR_loop");
- &movz ($tx,&BP(0,$d,$x));
- &add (&LB($y),&LB($tx));
- &movz ($ty,&BP(0,$d,$y));
- &movb (&BP(0,$d,$y),&LB($tx));
- &movb (&BP(0,$d,$x),&LB($ty));
- &add (&LB($ty),&LB($tx));
- &movz ($ty,&BP(0,$d,$ty));
- &xorb (&LB($ty),&BP(0,$in));
- &movb (&BP(0,$out),&LB($ty));
- &inc (&LB($x));
- &inc ($in);
- &inc ($out);
- &cmp ($in,&swtmp(2));
- &jb (&label("RC4_CHAR_loop"));
-
- &set_label("finished");
- &dec( $x);
- &stack_pop(3);
- &movb( &BP(-4,$d,"",0),&LB($y));
- &movb( &BP(-8,$d,"",0),&LB($x));
-
- &function_end($name);
- }
-
projects / bcm963xx.git / blobdiff