221 lines
6.4 KiB
Perl
221 lines
6.4 KiB
Perl
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#!/usr/bin/env perl
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# ====================================================================
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# [Re]written by Andy Polyakov <appro@fy.chalmers.se> for the OpenSSL
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# project. The module is, however, dual licensed under OpenSSL and
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# CRYPTOGAMS licenses depending on where you obtain it. For further
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# details see http://www.openssl.org/~appro/cryptogams/.
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# ====================================================================
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# "[Re]written" was achieved in two major overhauls. In 2004 BODY_*
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# functions were re-implemented to address P4 performance issue [see
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# commentary below], and in 2006 the rest was rewritten in order to
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# gain freedom to liberate licensing terms.
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# It was noted that Intel IA-32 C compiler generates code which
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# performs ~30% *faster* on P4 CPU than original *hand-coded*
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# SHA1 assembler implementation. To address this problem (and
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# prove that humans are still better than machines:-), the
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# original code was overhauled, which resulted in following
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# performance changes:
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#
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# compared with original compared with Intel cc
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# assembler impl. generated code
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# Pentium -16% +48%
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# PIII/AMD +8% +16%
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# P4 +85%(!) +45%
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#
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# As you can see Pentium came out as looser:-( Yet I reckoned that
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# improvement on P4 outweights the loss and incorporate this
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# re-tuned code to 0.9.7 and later.
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# ----------------------------------------------------------------
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# <appro@fy.chalmers.se>
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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],"sha1-586.pl",$ARGV[$#ARGV] eq "386");
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$A="eax";
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$B="ebx";
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$C="ecx";
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$D="edx";
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$E="edi";
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$T="esi";
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$tmp1="ebp";
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@V=($A,$B,$C,$D,$E,$T);
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sub BODY_00_15
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{
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local($n,$a,$b,$c,$d,$e,$f)=@_;
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&comment("00_15 $n");
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&mov($f,$c); # f to hold F_00_19(b,c,d)
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if ($n==0) { &mov($tmp1,$a); }
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else { &mov($a,$tmp1); }
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&rotl($tmp1,5); # tmp1=ROTATE(a,5)
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&xor($f,$d);
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&add($tmp1,$e); # tmp1+=e;
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&and($f,$b);
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&mov($e,&swtmp($n%16)); # e becomes volatile and is loaded
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# with xi, also note that e becomes
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# f in next round...
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&xor($f,$d); # f holds F_00_19(b,c,d)
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&rotr($b,2); # b=ROTATE(b,30)
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&lea($tmp1,&DWP(0x5a827999,$tmp1,$e)); # tmp1+=K_00_19+xi
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if ($n==15) { &add($f,$tmp1); } # f+=tmp1
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else { &add($tmp1,$f); } # f becomes a in next round
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}
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sub BODY_16_19
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{
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local($n,$a,$b,$c,$d,$e,$f)=@_;
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&comment("16_19 $n");
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&mov($f,&swtmp($n%16)); # f to hold Xupdate(xi,xa,xb,xc,xd)
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&mov($tmp1,$c); # tmp1 to hold F_00_19(b,c,d)
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&xor($f,&swtmp(($n+2)%16));
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&xor($tmp1,$d);
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&xor($f,&swtmp(($n+8)%16));
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&and($tmp1,$b); # tmp1 holds F_00_19(b,c,d)
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&rotr($b,2); # b=ROTATE(b,30)
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&xor($f,&swtmp(($n+13)%16)); # f holds xa^xb^xc^xd
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&rotl($f,1); # f=ROTATE(f,1)
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&xor($tmp1,$d); # tmp1=F_00_19(b,c,d)
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&mov(&swtmp($n%16),$f); # xi=f
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&lea($f,&DWP(0x5a827999,$f,$e));# f+=K_00_19+e
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&mov($e,$a); # e becomes volatile
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&rotl($e,5); # e=ROTATE(a,5)
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&add($f,$tmp1); # f+=F_00_19(b,c,d)
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&add($f,$e); # f+=ROTATE(a,5)
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}
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sub BODY_20_39
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{
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local($n,$a,$b,$c,$d,$e,$f)=@_;
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local $K=($n<40)?0x6ed9eba1:0xca62c1d6;
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&comment("20_39 $n");
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&mov($tmp1,$b); # tmp1 to hold F_20_39(b,c,d)
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&mov($f,&swtmp($n%16)); # f to hold Xupdate(xi,xa,xb,xc,xd)
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&rotr($b,2); # b=ROTATE(b,30)
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&xor($f,&swtmp(($n+2)%16));
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&xor($tmp1,$c);
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&xor($f,&swtmp(($n+8)%16));
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&xor($tmp1,$d); # tmp1 holds F_20_39(b,c,d)
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&xor($f,&swtmp(($n+13)%16)); # f holds xa^xb^xc^xd
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&rotl($f,1); # f=ROTATE(f,1)
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&add($tmp1,$e);
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&mov(&swtmp($n%16),$f); # xi=f
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&mov($e,$a); # e becomes volatile
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&rotl($e,5); # e=ROTATE(a,5)
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&lea($f,&DWP($K,$f,$tmp1)); # f+=K_20_39+e
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&add($f,$e); # f+=ROTATE(a,5)
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}
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sub BODY_40_59
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{
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local($n,$a,$b,$c,$d,$e,$f)=@_;
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&comment("40_59 $n");
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&mov($f,&swtmp($n%16)); # f to hold Xupdate(xi,xa,xb,xc,xd)
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&mov($tmp1,&swtmp(($n+2)%16));
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&xor($f,$tmp1);
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&mov($tmp1,&swtmp(($n+8)%16));
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&xor($f,$tmp1);
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&mov($tmp1,&swtmp(($n+13)%16));
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&xor($f,$tmp1); # f holds xa^xb^xc^xd
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&mov($tmp1,$b); # tmp1 to hold F_40_59(b,c,d)
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&rotl($f,1); # f=ROTATE(f,1)
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&or($tmp1,$c);
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&mov(&swtmp($n%16),$f); # xi=f
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&and($tmp1,$d);
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&lea($f,&DWP(0x8f1bbcdc,$f,$e));# f+=K_40_59+e
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&mov($e,$b); # e becomes volatile and is used
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# to calculate F_40_59(b,c,d)
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&rotr($b,2); # b=ROTATE(b,30)
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&and($e,$c);
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&or($tmp1,$e); # tmp1 holds F_40_59(b,c,d)
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&mov($e,$a);
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&rotl($e,5); # e=ROTATE(a,5)
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&add($f,$tmp1); # f+=tmp1;
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&add($f,$e); # f+=ROTATE(a,5)
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}
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&function_begin("sha1_block_data_order");
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&mov($tmp1,&wparam(0)); # SHA_CTX *c
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&mov($T,&wparam(1)); # const void *input
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&mov($A,&wparam(2)); # size_t num
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&stack_push(16); # allocate X[16]
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&shl($A,6);
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&add($A,$T);
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&mov(&wparam(2),$A); # pointer beyond the end of input
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&mov($E,&DWP(16,$tmp1));# pre-load E
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&set_label("loop",16);
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# copy input chunk to X, but reversing byte order!
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for ($i=0; $i<16; $i+=4)
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{
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&mov($A,&DWP(4*($i+0),$T));
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&mov($B,&DWP(4*($i+1),$T));
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&mov($C,&DWP(4*($i+2),$T));
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&mov($D,&DWP(4*($i+3),$T));
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&bswap($A);
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&bswap($B);
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&bswap($C);
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&bswap($D);
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&mov(&swtmp($i+0),$A);
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&mov(&swtmp($i+1),$B);
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&mov(&swtmp($i+2),$C);
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&mov(&swtmp($i+3),$D);
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}
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&mov(&wparam(1),$T); # redundant in 1st spin
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&mov($A,&DWP(0,$tmp1)); # load SHA_CTX
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&mov($B,&DWP(4,$tmp1));
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&mov($C,&DWP(8,$tmp1));
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&mov($D,&DWP(12,$tmp1));
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# E is pre-loaded
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for($i=0;$i<16;$i++) { &BODY_00_15($i,@V); unshift(@V,pop(@V)); }
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for(;$i<20;$i++) { &BODY_16_19($i,@V); unshift(@V,pop(@V)); }
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for(;$i<40;$i++) { &BODY_20_39($i,@V); unshift(@V,pop(@V)); }
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for(;$i<60;$i++) { &BODY_40_59($i,@V); unshift(@V,pop(@V)); }
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for(;$i<80;$i++) { &BODY_20_39($i,@V); unshift(@V,pop(@V)); }
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(($V[5] eq $D) and ($V[0] eq $E)) or die; # double-check
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&mov($tmp1,&wparam(0)); # re-load SHA_CTX*
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&mov($D,&wparam(1)); # D is last "T" and is discarded
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&add($E,&DWP(0,$tmp1)); # E is last "A"...
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&add($T,&DWP(4,$tmp1));
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&add($A,&DWP(8,$tmp1));
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&add($B,&DWP(12,$tmp1));
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&add($C,&DWP(16,$tmp1));
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&mov(&DWP(0,$tmp1),$E); # update SHA_CTX
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&add($D,64); # advance input pointer
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&mov(&DWP(4,$tmp1),$T);
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&cmp($D,&wparam(2)); # have we reached the end yet?
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&mov(&DWP(8,$tmp1),$A);
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&mov($E,$C); # C is last "E" which needs to be "pre-loaded"
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&mov(&DWP(12,$tmp1),$B);
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&mov($T,$D); # input pointer
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&mov(&DWP(16,$tmp1),$C);
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&jb(&label("loop"));
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&stack_pop(16);
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&function_end("sha1_block_data_order");
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&asciz("SHA1 block transform for x86, CRYPTOGAMS by <appro\@openssl.org>");
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&asm_finish();
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