crypto/openssl/crypto/sha/asm/sha1-586.pl

   1 #!/usr/bin/env perl
   2
   3 # ====================================================================
   4 # [Re]written by Andy Polyakov <appro@fy.chalmers.se> for the OpenSSL
   5 # project. The module is, however, dual licensed under OpenSSL and
   6 # CRYPTOGAMS licenses depending on where you obtain it. For further
   7 # details see http://www.openssl.org/~appro/cryptogams/.
   8 # ====================================================================
   9
  10 # "[Re]written" was achieved in two major overhauls. In 2004 BODY_*
  11 # functions were re-implemented to address P4 performance issue [see
  12 # commentary below], and in 2006 the rest was rewritten in order to
  13 # gain freedom to liberate licensing terms.
  14
  15 # It was noted that Intel IA-32 C compiler generates code which
  16 # performs ~30% *faster* on P4 CPU than original *hand-coded*
  17 # SHA1 assembler implementation. To address this problem (and
  18 # prove that humans are still better than machines:-), the
  19 # original code was overhauled, which resulted in following
  20 # performance changes:
  21 #
  22 #               compared with original  compared with Intel cc
  23 #               assembler impl.         generated code
  24 # Pentium       -16%                    +48%
  25 # PIII/AMD      +8%                     +16%
  26 # P4            +85%(!)                 +45%
  27 #
  28 # As you can see Pentium came out as looser:-( Yet I reckoned that
  29 # improvement on P4 outweights the loss and incorporate this
  30 # re-tuned code to 0.9.7 and later.
  31 # ----------------------------------------------------------------
  32 #                                       <appro@fy.chalmers.se>
  33
  34 $0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
  35 push(@INC,"${dir}","${dir}../../perlasm");
  36 require "x86asm.pl";
  37
  38 &asm_init($ARGV[0],"sha1-586.pl",$ARGV[$#ARGV] eq "386");
  39
  40 $A="eax";
  41 $B="ebx";
  42 $C="ecx";
  43 $D="edx";
  44 $E="edi";
  45 $T="esi";
  46 $tmp1="ebp";
  47
  48 @V=($A,$B,$C,$D,$E,$T);
  49
  50 sub BODY_00_15
  51         {
  52         local($n,$a,$b,$c,$d,$e,$f)=@_;
  53
  54         &comment("00_15 $n");
  55
  56         &mov($f,$c);                    # f to hold F_00_19(b,c,d)
  57          if ($n==0)  { &mov($tmp1,$a); }
  58          else        { &mov($a,$tmp1); }
  59         &rotl($tmp1,5);                 # tmp1=ROTATE(a,5)
  60          &xor($f,$d);
  61         &add($tmp1,$e);                 # tmp1+=e;
  62          &and($f,$b);
  63         &mov($e,&swtmp($n%16));         # e becomes volatile and is loaded
  64                                         # with xi, also note that e becomes
  65                                         # f in next round...
  66          &xor($f,$d);                   # f holds F_00_19(b,c,d)
  67         &rotr($b,2);                    # b=ROTATE(b,30)
  68          &lea($tmp1,&DWP(0x5a827999,$tmp1,$e)); # tmp1+=K_00_19+xi
  69
  70         if ($n==15) { &add($f,$tmp1); } # f+=tmp1
  71         else        { &add($tmp1,$f); } # f becomes a in next round
  72         }
  73
  74 sub BODY_16_19
  75         {
  76         local($n,$a,$b,$c,$d,$e,$f)=@_;
  77
  78         &comment("16_19 $n");
  79
  80         &mov($f,&swtmp($n%16));         # f to hold Xupdate(xi,xa,xb,xc,xd)
  81          &mov($tmp1,$c);                # tmp1 to hold F_00_19(b,c,d)
  82         &xor($f,&swtmp(($n+2)%16));
  83          &xor($tmp1,$d);
  84         &xor($f,&swtmp(($n+8)%16));
  85          &and($tmp1,$b);                # tmp1 holds F_00_19(b,c,d)
  86         &rotr($b,2);                    # b=ROTATE(b,30)
  87          &xor($f,&swtmp(($n+13)%16));   # f holds xa^xb^xc^xd
  88         &rotl($f,1);                    # f=ROTATE(f,1)
  89          &xor($tmp1,$d);                # tmp1=F_00_19(b,c,d)
  90         &mov(&swtmp($n%16),$f);         # xi=f
  91         &lea($f,&DWP(0x5a827999,$f,$e));# f+=K_00_19+e
  92          &mov($e,$a);                   # e becomes volatile
  93         &rotl($e,5);                    # e=ROTATE(a,5)
  94          &add($f,$tmp1);                # f+=F_00_19(b,c,d)
  95         &add($f,$e);                    # f+=ROTATE(a,5)
  96         }
  97
  98 sub BODY_20_39
  99         {
 100         local($n,$a,$b,$c,$d,$e,$f)=@_;
 101         local $K=($n<40)?0x6ed9eba1:0xca62c1d6;
 102
 103         &comment("20_39 $n");
 104
 105         &mov($tmp1,$b);                 # tmp1 to hold F_20_39(b,c,d)
 106          &mov($f,&swtmp($n%16));        # f to hold Xupdate(xi,xa,xb,xc,xd)
 107         &rotr($b,2);                    # b=ROTATE(b,30)
 108          &xor($f,&swtmp(($n+2)%16));
 109         &xor($tmp1,$c);
 110          &xor($f,&swtmp(($n+8)%16));
 111         &xor($tmp1,$d);                 # tmp1 holds F_20_39(b,c,d)
 112          &xor($f,&swtmp(($n+13)%16));   # f holds xa^xb^xc^xd
 113         &rotl($f,1);                    # f=ROTATE(f,1)
 114          &add($tmp1,$e);
 115         &mov(&swtmp($n%16),$f);         # xi=f
 116          &mov($e,$a);                   # e becomes volatile
 117         &rotl($e,5);                    # e=ROTATE(a,5)
 118          &lea($f,&DWP($K,$f,$tmp1));    # f+=K_20_39+e
 119         &add($f,$e);                    # f+=ROTATE(a,5)
 120         }
 121
 122 sub BODY_40_59
 123         {
 124         local($n,$a,$b,$c,$d,$e,$f)=@_;
 125
 126         &comment("40_59 $n");
 127
 128         &mov($f,&swtmp($n%16));         # f to hold Xupdate(xi,xa,xb,xc,xd)
 129          &mov($tmp1,&swtmp(($n+2)%16));
 130         &xor($f,$tmp1);
 131          &mov($tmp1,&swtmp(($n+8)%16));
 132         &xor($f,$tmp1);
 133          &mov($tmp1,&swtmp(($n+13)%16));
 134         &xor($f,$tmp1);                 # f holds xa^xb^xc^xd
 135          &mov($tmp1,$b);                # tmp1 to hold F_40_59(b,c,d)
 136         &rotl($f,1);                    # f=ROTATE(f,1)
 137          &or($tmp1,$c);
 138         &mov(&swtmp($n%16),$f);         # xi=f
 139          &and($tmp1,$d);
 140         &lea($f,&DWP(0x8f1bbcdc,$f,$e));# f+=K_40_59+e
 141          &mov($e,$b);                   # e becomes volatile and is used
 142                                         # to calculate F_40_59(b,c,d)
 143         &rotr($b,2);                    # b=ROTATE(b,30)
 144          &and($e,$c);
 145         &or($tmp1,$e);                  # tmp1 holds F_40_59(b,c,d)
 146          &mov($e,$a);
 147         &rotl($e,5);                    # e=ROTATE(a,5)
 148          &add($f,$tmp1);                # f+=tmp1;
 149         &add($f,$e);                    # f+=ROTATE(a,5)
 150         }
 151
 152 &function_begin("sha1_block_data_order");
 153         &mov($tmp1,&wparam(0)); # SHA_CTX *c
 154         &mov($T,&wparam(1));    # const void *input
 155         &mov($A,&wparam(2));    # size_t num
 156         &stack_push(16);        # allocate X[16]
 157         &shl($A,6);
 158         &add($A,$T);
 159         &mov(&wparam(2),$A);    # pointer beyond the end of input
 160         &mov($E,&DWP(16,$tmp1));# pre-load E
 161
 162         &set_label("loop",16);
 163
 164         # copy input chunk to X, but reversing byte order!
 165         for ($i=0; $i<16; $i+=4)
 166                 {
 167                 &mov($A,&DWP(4*($i+0),$T));
 168                 &mov($B,&DWP(4*($i+1),$T));
 169                 &mov($C,&DWP(4*($i+2),$T));
 170                 &mov($D,&DWP(4*($i+3),$T));
 171                 &bswap($A);
 172                 &bswap($B);
 173                 &bswap($C);
 174                 &bswap($D);
 175                 &mov(&swtmp($i+0),$A);
 176                 &mov(&swtmp($i+1),$B);
 177                 &mov(&swtmp($i+2),$C);
 178                 &mov(&swtmp($i+3),$D);
 179                 }
 180         &mov(&wparam(1),$T);    # redundant in 1st spin
 181
 182         &mov($A,&DWP(0,$tmp1)); # load SHA_CTX
 183         &mov($B,&DWP(4,$tmp1));
 184         &mov($C,&DWP(8,$tmp1));
 185         &mov($D,&DWP(12,$tmp1));
 186         # E is pre-loaded
 187
 188         for($i=0;$i<16;$i++)    { &BODY_00_15($i,@V); unshift(@V,pop(@V)); }
 189         for(;$i<20;$i++)        { &BODY_16_19($i,@V); unshift(@V,pop(@V)); }
 190         for(;$i<40;$i++)        { &BODY_20_39($i,@V); unshift(@V,pop(@V)); }
 191         for(;$i<60;$i++)        { &BODY_40_59($i,@V); unshift(@V,pop(@V)); }
 192         for(;$i<80;$i++)        { &BODY_20_39($i,@V); unshift(@V,pop(@V)); }
 193
 194         (($V[5] eq $D) and ($V[0] eq $E)) or die;       # double-check
 195
 196         &mov($tmp1,&wparam(0)); # re-load SHA_CTX*
 197         &mov($D,&wparam(1));    # D is last "T" and is discarded
 198
 199         &add($E,&DWP(0,$tmp1)); # E is last "A"...
 200         &add($T,&DWP(4,$tmp1));
 201         &add($A,&DWP(8,$tmp1));
 202         &add($B,&DWP(12,$tmp1));
 203         &add($C,&DWP(16,$tmp1));
 204
 205         &mov(&DWP(0,$tmp1),$E); # update SHA_CTX
 206          &add($D,64);           # advance input pointer
 207         &mov(&DWP(4,$tmp1),$T);
 208          &cmp($D,&wparam(2));   # have we reached the end yet?
 209         &mov(&DWP(8,$tmp1),$A);
 210          &mov($E,$C);           # C is last "E" which needs to be "pre-loaded"
 211         &mov(&DWP(12,$tmp1),$B);
 212          &mov($T,$D);           # input pointer
 213         &mov(&DWP(16,$tmp1),$C);
 214         &jb(&label("loop"));
 215
 216         &stack_pop(16);
 217 &function_end("sha1_block_data_order");
 218 &asciz("SHA1 block transform for x86, CRYPTOGAMS by <appro\@openssl.org>");
 219
 220 &asm_finish();