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320 lines
7.1 KiB
320 lines
7.1 KiB
14 years ago
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#!/usr/bin/env perl
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# ====================================================================
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# 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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# I let hardware handle unaligned input(*), except on page boundaries
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# (see below for details). Otherwise straightforward implementation
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# with X vector in register bank. The module is big-endian [which is
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# not big deal as there're no little-endian targets left around].
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#
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# (*) this means that this module is inappropriate for PPC403? Does
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# anybody know if pre-POWER3 can sustain unaligned load?
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# -m64 -m32
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# ----------------------------------
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# PPC970,gcc-4.0.0 +76% +59%
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# Power6,xlc-7 +68% +33%
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$flavour = shift;
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if ($flavour =~ /64/) {
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$SIZE_T =8;
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$UCMP ="cmpld";
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$STU ="stdu";
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$POP ="ld";
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$PUSH ="std";
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} elsif ($flavour =~ /32/) {
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$SIZE_T =4;
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$UCMP ="cmplw";
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$STU ="stwu";
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$POP ="lwz";
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$PUSH ="stw";
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} else { die "nonsense $flavour"; }
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$0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
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( $xlate="${dir}ppc-xlate.pl" and -f $xlate ) or
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( $xlate="${dir}../../perlasm/ppc-xlate.pl" and -f $xlate) or
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die "can't locate ppc-xlate.pl";
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open STDOUT,"| $^X $xlate $flavour ".shift || die "can't call $xlate: $!";
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$FRAME=24*$SIZE_T;
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$K ="r0";
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$sp ="r1";
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$toc="r2";
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$ctx="r3";
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$inp="r4";
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$num="r5";
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$t0 ="r15";
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$t1 ="r6";
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$A ="r7";
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$B ="r8";
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$C ="r9";
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$D ="r10";
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$E ="r11";
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$T ="r12";
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@V=($A,$B,$C,$D,$E,$T);
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@X=("r16","r17","r18","r19","r20","r21","r22","r23",
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"r24","r25","r26","r27","r28","r29","r30","r31");
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sub BODY_00_19 {
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my ($i,$a,$b,$c,$d,$e,$f)=@_;
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my $j=$i+1;
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$code.=<<___ if ($i==0);
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lwz @X[$i],`$i*4`($inp)
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___
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$code.=<<___ if ($i<15);
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lwz @X[$j],`$j*4`($inp)
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add $f,$K,$e
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rotlwi $e,$a,5
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add $f,$f,@X[$i]
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and $t0,$c,$b
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add $f,$f,$e
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andc $t1,$d,$b
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rotlwi $b,$b,30
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or $t0,$t0,$t1
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add $f,$f,$t0
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___
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$code.=<<___ if ($i>=15);
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add $f,$K,$e
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rotlwi $e,$a,5
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xor @X[$j%16],@X[$j%16],@X[($j+2)%16]
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add $f,$f,@X[$i%16]
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and $t0,$c,$b
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xor @X[$j%16],@X[$j%16],@X[($j+8)%16]
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add $f,$f,$e
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andc $t1,$d,$b
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rotlwi $b,$b,30
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or $t0,$t0,$t1
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xor @X[$j%16],@X[$j%16],@X[($j+13)%16]
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add $f,$f,$t0
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rotlwi @X[$j%16],@X[$j%16],1
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___
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}
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sub BODY_20_39 {
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my ($i,$a,$b,$c,$d,$e,$f)=@_;
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my $j=$i+1;
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$code.=<<___ if ($i<79);
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add $f,$K,$e
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rotlwi $e,$a,5
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xor @X[$j%16],@X[$j%16],@X[($j+2)%16]
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add $f,$f,@X[$i%16]
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xor $t0,$b,$c
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xor @X[$j%16],@X[$j%16],@X[($j+8)%16]
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add $f,$f,$e
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rotlwi $b,$b,30
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xor $t0,$t0,$d
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xor @X[$j%16],@X[$j%16],@X[($j+13)%16]
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add $f,$f,$t0
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rotlwi @X[$j%16],@X[$j%16],1
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___
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$code.=<<___ if ($i==79);
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add $f,$K,$e
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rotlwi $e,$a,5
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lwz r16,0($ctx)
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add $f,$f,@X[$i%16]
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xor $t0,$b,$c
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lwz r17,4($ctx)
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add $f,$f,$e
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rotlwi $b,$b,30
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lwz r18,8($ctx)
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xor $t0,$t0,$d
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lwz r19,12($ctx)
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add $f,$f,$t0
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lwz r20,16($ctx)
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___
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}
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sub BODY_40_59 {
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my ($i,$a,$b,$c,$d,$e,$f)=@_;
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my $j=$i+1;
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$code.=<<___;
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add $f,$K,$e
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rotlwi $e,$a,5
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xor @X[$j%16],@X[$j%16],@X[($j+2)%16]
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add $f,$f,@X[$i%16]
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and $t0,$b,$c
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xor @X[$j%16],@X[$j%16],@X[($j+8)%16]
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add $f,$f,$e
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or $t1,$b,$c
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rotlwi $b,$b,30
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xor @X[$j%16],@X[$j%16],@X[($j+13)%16]
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and $t1,$t1,$d
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or $t0,$t0,$t1
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rotlwi @X[$j%16],@X[$j%16],1
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add $f,$f,$t0
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___
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}
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$code=<<___;
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.machine "any"
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.text
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.globl .sha1_block_data_order
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.align 4
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.sha1_block_data_order:
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mflr r0
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$STU $sp,`-($FRAME+64)`($sp)
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$PUSH r0,`$FRAME-$SIZE_T*18`($sp)
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$PUSH r15,`$FRAME-$SIZE_T*17`($sp)
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$PUSH r16,`$FRAME-$SIZE_T*16`($sp)
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$PUSH r17,`$FRAME-$SIZE_T*15`($sp)
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$PUSH r18,`$FRAME-$SIZE_T*14`($sp)
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$PUSH r19,`$FRAME-$SIZE_T*13`($sp)
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$PUSH r20,`$FRAME-$SIZE_T*12`($sp)
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$PUSH r21,`$FRAME-$SIZE_T*11`($sp)
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$PUSH r22,`$FRAME-$SIZE_T*10`($sp)
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$PUSH r23,`$FRAME-$SIZE_T*9`($sp)
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$PUSH r24,`$FRAME-$SIZE_T*8`($sp)
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$PUSH r25,`$FRAME-$SIZE_T*7`($sp)
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$PUSH r26,`$FRAME-$SIZE_T*6`($sp)
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$PUSH r27,`$FRAME-$SIZE_T*5`($sp)
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$PUSH r28,`$FRAME-$SIZE_T*4`($sp)
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$PUSH r29,`$FRAME-$SIZE_T*3`($sp)
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$PUSH r30,`$FRAME-$SIZE_T*2`($sp)
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$PUSH r31,`$FRAME-$SIZE_T*1`($sp)
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lwz $A,0($ctx)
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lwz $B,4($ctx)
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lwz $C,8($ctx)
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lwz $D,12($ctx)
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lwz $E,16($ctx)
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andi. r0,$inp,3
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bne Lunaligned
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Laligned:
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mtctr $num
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bl Lsha1_block_private
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Ldone:
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$POP r0,`$FRAME-$SIZE_T*18`($sp)
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$POP r15,`$FRAME-$SIZE_T*17`($sp)
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$POP r16,`$FRAME-$SIZE_T*16`($sp)
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$POP r17,`$FRAME-$SIZE_T*15`($sp)
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$POP r18,`$FRAME-$SIZE_T*14`($sp)
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$POP r19,`$FRAME-$SIZE_T*13`($sp)
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$POP r20,`$FRAME-$SIZE_T*12`($sp)
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$POP r21,`$FRAME-$SIZE_T*11`($sp)
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$POP r22,`$FRAME-$SIZE_T*10`($sp)
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$POP r23,`$FRAME-$SIZE_T*9`($sp)
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$POP r24,`$FRAME-$SIZE_T*8`($sp)
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$POP r25,`$FRAME-$SIZE_T*7`($sp)
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$POP r26,`$FRAME-$SIZE_T*6`($sp)
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$POP r27,`$FRAME-$SIZE_T*5`($sp)
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$POP r28,`$FRAME-$SIZE_T*4`($sp)
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$POP r29,`$FRAME-$SIZE_T*3`($sp)
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$POP r30,`$FRAME-$SIZE_T*2`($sp)
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$POP r31,`$FRAME-$SIZE_T*1`($sp)
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mtlr r0
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addi $sp,$sp,`$FRAME+64`
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blr
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___
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# PowerPC specification allows an implementation to be ill-behaved
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# upon unaligned access which crosses page boundary. "Better safe
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# than sorry" principle makes me treat it specially. But I don't
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# look for particular offending word, but rather for 64-byte input
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# block which crosses the boundary. Once found that block is aligned
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# and hashed separately...
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$code.=<<___;
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.align 4
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Lunaligned:
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subfic $t1,$inp,4096
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andi. $t1,$t1,4095 ; distance to closest page boundary
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srwi. $t1,$t1,6 ; t1/=64
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beq Lcross_page
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$UCMP $num,$t1
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ble- Laligned ; didn't cross the page boundary
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mtctr $t1
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subfc $num,$t1,$num
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bl Lsha1_block_private
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Lcross_page:
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li $t1,16
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mtctr $t1
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addi r20,$sp,$FRAME ; spot below the frame
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Lmemcpy:
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lbz r16,0($inp)
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lbz r17,1($inp)
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lbz r18,2($inp)
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lbz r19,3($inp)
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addi $inp,$inp,4
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stb r16,0(r20)
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stb r17,1(r20)
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stb r18,2(r20)
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stb r19,3(r20)
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addi r20,r20,4
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bdnz Lmemcpy
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$PUSH $inp,`$FRAME-$SIZE_T*19`($sp)
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li $t1,1
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addi $inp,$sp,$FRAME
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mtctr $t1
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bl Lsha1_block_private
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$POP $inp,`$FRAME-$SIZE_T*19`($sp)
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addic. $num,$num,-1
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bne- Lunaligned
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b Ldone
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___
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# This is private block function, which uses tailored calling
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# interface, namely upon entry SHA_CTX is pre-loaded to given
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# registers and counter register contains amount of chunks to
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# digest...
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$code.=<<___;
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.align 4
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Lsha1_block_private:
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___
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$code.=<<___; # load K_00_19
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lis $K,0x5a82
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ori $K,$K,0x7999
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___
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for($i=0;$i<20;$i++) { &BODY_00_19($i,@V); unshift(@V,pop(@V)); }
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$code.=<<___; # load K_20_39
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lis $K,0x6ed9
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ori $K,$K,0xeba1
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___
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for(;$i<40;$i++) { &BODY_20_39($i,@V); unshift(@V,pop(@V)); }
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$code.=<<___; # load K_40_59
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lis $K,0x8f1b
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ori $K,$K,0xbcdc
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___
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for(;$i<60;$i++) { &BODY_40_59($i,@V); unshift(@V,pop(@V)); }
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$code.=<<___; # load K_60_79
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lis $K,0xca62
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ori $K,$K,0xc1d6
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___
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for(;$i<80;$i++) { &BODY_20_39($i,@V); unshift(@V,pop(@V)); }
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$code.=<<___;
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add r16,r16,$E
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add r17,r17,$T
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add r18,r18,$A
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add r19,r19,$B
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add r20,r20,$C
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stw r16,0($ctx)
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mr $A,r16
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stw r17,4($ctx)
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mr $B,r17
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stw r18,8($ctx)
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mr $C,r18
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stw r19,12($ctx)
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mr $D,r19
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stw r20,16($ctx)
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mr $E,r20
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addi $inp,$inp,`16*4`
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bdnz- Lsha1_block_private
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blr
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___
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$code.=<<___;
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.asciz "SHA1 block transform for PPC, CRYPTOGAMS by <appro\@fy.chalmers.se>"
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___
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$code =~ s/\`([^\`]*)\`/eval $1/gem;
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print $code;
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close STDOUT;
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