crypto/sha/asm/sha1-ppc.pl

   1 #!/usr/bin/env perl
   2
   3 # ====================================================================
   4 # 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 # I let hardware handle unaligned input(*), except on page boundaries
  11 # (see below for details). Otherwise straightforward implementation
  12 # with X vector in register bank.
  13 #
  14 # (*) this means that this module is inappropriate for PPC403? Does
  15 #     anybody know if pre-POWER3 can sustain unaligned load?
  16
  17 #                       -m64    -m32
  18 # ----------------------------------
  19 # PPC970,gcc-4.0.0      +76%    +59%
  20 # Power6,xlc-7          +68%    +33%
  21
  22 $flavour = shift;
  23
  24 if ($flavour =~ /64/) {
  25         $SIZE_T =8;
  26         $LRSAVE =2*$SIZE_T;
  27         $UCMP   ="cmpld";
  28         $STU    ="stdu";
  29         $POP    ="ld";
  30         $PUSH   ="std";
  31 } elsif ($flavour =~ /32/) {
  32         $SIZE_T =4;
  33         $LRSAVE =$SIZE_T;
  34         $UCMP   ="cmplw";
  35         $STU    ="stwu";
  36         $POP    ="lwz";
  37         $PUSH   ="stw";
  38 } else { die "nonsense $flavour"; }
  39
  40 # Define endianess based on flavour
  41 # i.e.: linux64le
  42 $LITTLE_ENDIAN = ($flavour=~/le$/) ? $SIZE_T : 0;
  43
  44 $0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
  45 ( $xlate="${dir}ppc-xlate.pl" and -f $xlate ) or
  46 ( $xlate="${dir}../../perlasm/ppc-xlate.pl" and -f $xlate) or
  47 die "can't locate ppc-xlate.pl";
  48
  49 open STDOUT,"| $^X $xlate $flavour ".shift || die "can't call $xlate: $!";
  50
  51 $FRAME=24*$SIZE_T+64;
  52 $LOCALS=6*$SIZE_T;
  53
  54 $K  ="r0";
  55 $sp ="r1";
  56 $toc="r2";
  57 $ctx="r3";
  58 $inp="r4";
  59 $num="r5";
  60 $t0 ="r15";
  61 $t1 ="r6";
  62
  63 $A  ="r7";
  64 $B  ="r8";
  65 $C  ="r9";
  66 $D  ="r10";
  67 $E  ="r11";
  68 $T  ="r12";
  69
  70 @V=($A,$B,$C,$D,$E,$T);
  71 @X=("r16","r17","r18","r19","r20","r21","r22","r23",
  72     "r24","r25","r26","r27","r28","r29","r30","r31");
  73
  74 sub loadbe {
  75 my ($dst, $src, $temp_reg) = @_;
  76 $code.=<<___ if (!$LITTLE_ENDIAN);
  77         lwz     $dst,$src
  78 ___
  79 $code.=<<___ if ($LITTLE_ENDIAN);
  80         lwz     $temp_reg,$src
  81         rotlwi  $dst,$temp_reg,8
  82         rlwimi  $dst,$temp_reg,24,0,7
  83         rlwimi  $dst,$temp_reg,24,16,23
  84 ___
  85 }
  86
  87 sub BODY_00_19 {
  88 my ($i,$a,$b,$c,$d,$e,$f)=@_;
  89 my $j=$i+1;
  90
  91         # Since the last value of $f is discarded, we can use
  92         # it as a temp reg to swap byte-order when needed.
  93         loadbe("@X[$i]","`$i*4`($inp)",$f) if ($i==0);
  94         loadbe("@X[$j]","`$j*4`($inp)",$f) if ($i<15);
  95 $code.=<<___ if ($i<15);
  96         add     $f,$K,$e
  97         rotlwi  $e,$a,5
  98         add     $f,$f,@X[$i]
  99         and     $t0,$c,$b
 100         add     $f,$f,$e
 101         andc    $t1,$d,$b
 102         rotlwi  $b,$b,30
 103         or      $t0,$t0,$t1
 104         add     $f,$f,$t0
 105 ___
 106 $code.=<<___ if ($i>=15);
 107         add     $f,$K,$e
 108         rotlwi  $e,$a,5
 109         xor     @X[$j%16],@X[$j%16],@X[($j+2)%16]
 110         add     $f,$f,@X[$i%16]
 111         and     $t0,$c,$b
 112         xor     @X[$j%16],@X[$j%16],@X[($j+8)%16]
 113         add     $f,$f,$e
 114         andc    $t1,$d,$b
 115         rotlwi  $b,$b,30
 116         or      $t0,$t0,$t1
 117         xor     @X[$j%16],@X[$j%16],@X[($j+13)%16]
 118         add     $f,$f,$t0
 119         rotlwi  @X[$j%16],@X[$j%16],1
 120 ___
 121 }
 122
 123 sub BODY_20_39 {
 124 my ($i,$a,$b,$c,$d,$e,$f)=@_;
 125 my $j=$i+1;
 126 $code.=<<___ if ($i<79);
 127         add     $f,$K,$e
 128         rotlwi  $e,$a,5
 129         xor     @X[$j%16],@X[$j%16],@X[($j+2)%16]
 130         add     $f,$f,@X[$i%16]
 131         xor     $t0,$b,$c
 132         xor     @X[$j%16],@X[$j%16],@X[($j+8)%16]
 133         add     $f,$f,$e
 134         rotlwi  $b,$b,30
 135         xor     $t0,$t0,$d
 136         xor     @X[$j%16],@X[$j%16],@X[($j+13)%16]
 137         add     $f,$f,$t0
 138         rotlwi  @X[$j%16],@X[$j%16],1
 139 ___
 140 $code.=<<___ if ($i==79);
 141         add     $f,$K,$e
 142         rotlwi  $e,$a,5
 143         lwz     r16,0($ctx)
 144         add     $f,$f,@X[$i%16]
 145         xor     $t0,$b,$c
 146         lwz     r17,4($ctx)
 147         add     $f,$f,$e
 148         rotlwi  $b,$b,30
 149         lwz     r18,8($ctx)
 150         xor     $t0,$t0,$d
 151         lwz     r19,12($ctx)
 152         add     $f,$f,$t0
 153         lwz     r20,16($ctx)
 154 ___
 155 }
 156
 157 sub BODY_40_59 {
 158 my ($i,$a,$b,$c,$d,$e,$f)=@_;
 159 my $j=$i+1;
 160 $code.=<<___;
 161         add     $f,$K,$e
 162         rotlwi  $e,$a,5
 163         xor     @X[$j%16],@X[$j%16],@X[($j+2)%16]
 164         add     $f,$f,@X[$i%16]
 165         and     $t0,$b,$c
 166         xor     @X[$j%16],@X[$j%16],@X[($j+8)%16]
 167         add     $f,$f,$e
 168         or      $t1,$b,$c
 169         rotlwi  $b,$b,30
 170         xor     @X[$j%16],@X[$j%16],@X[($j+13)%16]
 171         and     $t1,$t1,$d
 172         or      $t0,$t0,$t1
 173         rotlwi  @X[$j%16],@X[$j%16],1
 174         add     $f,$f,$t0
 175 ___
 176 }
 177
 178 $code=<<___;
 179 .machine        "any"
 180 .text
 181
 182 .globl  .sha1_block_data_order
 183 .align  4
 184 .sha1_block_data_order:
 185         $STU    $sp,-$FRAME($sp)
 186         mflr    r0
 187         $PUSH   r15,`$FRAME-$SIZE_T*17`($sp)
 188         $PUSH   r16,`$FRAME-$SIZE_T*16`($sp)
 189         $PUSH   r17,`$FRAME-$SIZE_T*15`($sp)
 190         $PUSH   r18,`$FRAME-$SIZE_T*14`($sp)
 191         $PUSH   r19,`$FRAME-$SIZE_T*13`($sp)
 192         $PUSH   r20,`$FRAME-$SIZE_T*12`($sp)
 193         $PUSH   r21,`$FRAME-$SIZE_T*11`($sp)
 194         $PUSH   r22,`$FRAME-$SIZE_T*10`($sp)
 195         $PUSH   r23,`$FRAME-$SIZE_T*9`($sp)
 196         $PUSH   r24,`$FRAME-$SIZE_T*8`($sp)
 197         $PUSH   r25,`$FRAME-$SIZE_T*7`($sp)
 198         $PUSH   r26,`$FRAME-$SIZE_T*6`($sp)
 199         $PUSH   r27,`$FRAME-$SIZE_T*5`($sp)
 200         $PUSH   r28,`$FRAME-$SIZE_T*4`($sp)
 201         $PUSH   r29,`$FRAME-$SIZE_T*3`($sp)
 202         $PUSH   r30,`$FRAME-$SIZE_T*2`($sp)
 203         $PUSH   r31,`$FRAME-$SIZE_T*1`($sp)
 204         $PUSH   r0,`$FRAME+$LRSAVE`($sp)
 205         lwz     $A,0($ctx)
 206         lwz     $B,4($ctx)
 207         lwz     $C,8($ctx)
 208         lwz     $D,12($ctx)
 209         lwz     $E,16($ctx)
 210         andi.   r0,$inp,3
 211         bne     Lunaligned
 212 Laligned:
 213         mtctr   $num
 214         bl      Lsha1_block_private
 215         b       Ldone
 216
 217 ; PowerPC specification allows an implementation to be ill-behaved
 218 ; upon unaligned access which crosses page boundary. "Better safe
 219 ; than sorry" principle makes me treat it specially. But I don't
 220 ; look for particular offending word, but rather for 64-byte input
 221 ; block which crosses the boundary. Once found that block is aligned
 222 ; and hashed separately...
 223 .align  4
 224 Lunaligned:
 225         subfic  $t1,$inp,4096
 226         andi.   $t1,$t1,4095    ; distance to closest page boundary
 227         srwi.   $t1,$t1,6       ; t1/=64
 228         beq     Lcross_page
 229         $UCMP   $num,$t1
 230         ble-    Laligned        ; didn't cross the page boundary
 231         mtctr   $t1
 232         subfc   $num,$t1,$num
 233         bl      Lsha1_block_private
 234 Lcross_page:
 235         li      $t1,16
 236         mtctr   $t1
 237         addi    r20,$sp,$LOCALS ; spot within the frame
 238 Lmemcpy:
 239         lbz     r16,0($inp)
 240         lbz     r17,1($inp)
 241         lbz     r18,2($inp)
 242         lbz     r19,3($inp)
 243         addi    $inp,$inp,4
 244         stb     r16,0(r20)
 245         stb     r17,1(r20)
 246         stb     r18,2(r20)
 247         stb     r19,3(r20)
 248         addi    r20,r20,4
 249         bdnz    Lmemcpy
 250
 251         $PUSH   $inp,`$FRAME-$SIZE_T*18`($sp)
 252         li      $t1,1
 253         addi    $inp,$sp,$LOCALS
 254         mtctr   $t1
 255         bl      Lsha1_block_private
 256         $POP    $inp,`$FRAME-$SIZE_T*18`($sp)
 257         addic.  $num,$num,-1
 258         bne-    Lunaligned
 259
 260 Ldone:
 261         $POP    r0,`$FRAME+$LRSAVE`($sp)
 262         $POP    r15,`$FRAME-$SIZE_T*17`($sp)
 263         $POP    r16,`$FRAME-$SIZE_T*16`($sp)
 264         $POP    r17,`$FRAME-$SIZE_T*15`($sp)
 265         $POP    r18,`$FRAME-$SIZE_T*14`($sp)
 266         $POP    r19,`$FRAME-$SIZE_T*13`($sp)
 267         $POP    r20,`$FRAME-$SIZE_T*12`($sp)
 268         $POP    r21,`$FRAME-$SIZE_T*11`($sp)
 269         $POP    r22,`$FRAME-$SIZE_T*10`($sp)
 270         $POP    r23,`$FRAME-$SIZE_T*9`($sp)
 271         $POP    r24,`$FRAME-$SIZE_T*8`($sp)
 272         $POP    r25,`$FRAME-$SIZE_T*7`($sp)
 273         $POP    r26,`$FRAME-$SIZE_T*6`($sp)
 274         $POP    r27,`$FRAME-$SIZE_T*5`($sp)
 275         $POP    r28,`$FRAME-$SIZE_T*4`($sp)
 276         $POP    r29,`$FRAME-$SIZE_T*3`($sp)
 277         $POP    r30,`$FRAME-$SIZE_T*2`($sp)
 278         $POP    r31,`$FRAME-$SIZE_T*1`($sp)
 279         mtlr    r0
 280         addi    $sp,$sp,$FRAME
 281         blr
 282         .long   0
 283         .byte   0,12,4,1,0x80,18,3,0
 284         .long   0
 285 ___
 286
 287 # This is private block function, which uses tailored calling
 288 # interface, namely upon entry SHA_CTX is pre-loaded to given
 289 # registers and counter register contains amount of chunks to
 290 # digest...
 291 $code.=<<___;
 292 .align  4
 293 Lsha1_block_private:
 294 ___
 295 $code.=<<___;   # load K_00_19
 296         lis     $K,0x5a82
 297         ori     $K,$K,0x7999
 298 ___
 299 for($i=0;$i<20;$i++)    { &BODY_00_19($i,@V); unshift(@V,pop(@V)); }
 300 $code.=<<___;   # load K_20_39
 301         lis     $K,0x6ed9
 302         ori     $K,$K,0xeba1
 303 ___
 304 for(;$i<40;$i++)        { &BODY_20_39($i,@V); unshift(@V,pop(@V)); }
 305 $code.=<<___;   # load K_40_59
 306         lis     $K,0x8f1b
 307         ori     $K,$K,0xbcdc
 308 ___
 309 for(;$i<60;$i++)        { &BODY_40_59($i,@V); unshift(@V,pop(@V)); }
 310 $code.=<<___;   # load K_60_79
 311         lis     $K,0xca62
 312         ori     $K,$K,0xc1d6
 313 ___
 314 for(;$i<80;$i++)        { &BODY_20_39($i,@V); unshift(@V,pop(@V)); }
 315 $code.=<<___;
 316         add     r16,r16,$E
 317         add     r17,r17,$T
 318         add     r18,r18,$A
 319         add     r19,r19,$B
 320         add     r20,r20,$C
 321         stw     r16,0($ctx)
 322         mr      $A,r16
 323         stw     r17,4($ctx)
 324         mr      $B,r17
 325         stw     r18,8($ctx)
 326         mr      $C,r18
 327         stw     r19,12($ctx)
 328         mr      $D,r19
 329         stw     r20,16($ctx)
 330         mr      $E,r20
 331         addi    $inp,$inp,`16*4`
 332         bdnz-   Lsha1_block_private
 333         blr
 334         .long   0
 335         .byte   0,12,0x14,0,0,0,0,0
 336 .size   .sha1_block_data_order,.-.sha1_block_data_order
 337 ___
 338 $code.=<<___;
 339 .asciz  "SHA1 block transform for PPC, CRYPTOGAMS by <appro\@fy.chalmers.se>"
 340 ___
 341
 342 $code =~ s/\`([^\`]*)\`/eval $1/gem;
 343 print $code;
 344 close STDOUT;