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#!/usr/bin/env perl
# ====================================================================
# Written by Andy Polyakov <appro@fy.chalmers.se> for the OpenSSL
# project. The module is, however, dual licensed under OpenSSL and
# CRYPTOGAMS licenses depending on where you obtain it. For further
# details see http://www.openssl.org/~appro/cryptogams/.
# ====================================================================
# SHA256 block procedure for ARMv4. May 2007.
# Performance is ~2x better than gcc 3.4 generated code and in "abso-
# lute" terms is ~2250 cycles per 64-byte block or ~35 cycles per
# byte [on single-issue Xscale PXA250 core].
# July 2010.
#
# Rescheduling for dual-issue pipeline resulted in 22% improvement on
# Cortex A8 core and ~20 cycles per processed byte.
# February 2011.
#
# Profiler-assisted and platform-specific optimization resulted in 16%
# improvement on Cortex A8 core and ~17 cycles per processed byte.
while (($output=shift) && ($output!~/^\w[\w\-]*\.\w+$/)) {}
open STDOUT,">$output";
$ctx="r0"; $t0="r0";
$inp="r1"; $t3="r1";
$len="r2"; $t1="r2";
$T1="r3";
$A="r4";
$B="r5";
$C="r6";
$D="r7";
$E="r8";
$F="r9";
$G="r10";
$H="r11";
@V=($A,$B,$C,$D,$E,$F,$G,$H);
$t2="r12";
$Ktbl="r14";
@Sigma0=( 2,13,22);
@Sigma1=( 6,11,25);
@sigma0=( 7,18, 3);
@sigma1=(17,19,10);
sub BODY_00_15 {
my ($i,$a,$b,$c,$d,$e,$f,$g,$h) = @_;
$code.=<<___ if ($i<16);
#if __ARM_ARCH__>=7
ldr $T1,[$inp],#4
#else
ldrb $T1,[$inp,#3] @ $i
ldrb $t2,[$inp,#2]
ldrb $t1,[$inp,#1]
ldrb $t0,[$inp],#4
orr $T1,$T1,$t2,lsl#8
orr $T1,$T1,$t1,lsl#16
orr $T1,$T1,$t0,lsl#24
#endif
___
$code.=<<___;
mov $t0,$e,ror#$Sigma1[0]
ldr $t2,[$Ktbl],#4 @ *K256++
eor $t0,$t0,$e,ror#$Sigma1[1]
eor $t1,$f,$g
#if $i>=16
add $T1,$T1,$t3 @ from BODY_16_xx
#elif __ARM_ARCH__>=7 && defined(__ARMEL__)
rev $T1,$T1
#endif
#if $i==15
str $inp,[sp,#17*4] @ leave room for $t3
#endif
eor $t0,$t0,$e,ror#$Sigma1[2] @ Sigma1(e)
and $t1,$t1,$e
str $T1,[sp,#`$i%16`*4]
add $T1,$T1,$t0
eor $t1,$t1,$g @ Ch(e,f,g)
add $T1,$T1,$h
mov $h,$a,ror#$Sigma0[0]
add $T1,$T1,$t1
eor $h,$h,$a,ror#$Sigma0[1]
add $T1,$T1,$t2
eor $h,$h,$a,ror#$Sigma0[2] @ Sigma0(a)
#if $i>=15
ldr $t3,[sp,#`($i+2)%16`*4] @ from BODY_16_xx
#endif
orr $t0,$a,$b
and $t1,$a,$b
and $t0,$t0,$c
add $h,$h,$T1
orr $t0,$t0,$t1 @ Maj(a,b,c)
add $d,$d,$T1
add $h,$h,$t0
___
}
sub BODY_16_XX {
my ($i,$a,$b,$c,$d,$e,$f,$g,$h) = @_;
$code.=<<___;
@ ldr $t3,[sp,#`($i+1)%16`*4] @ $i
ldr $t2,[sp,#`($i+14)%16`*4]
mov $t0,$t3,ror#$sigma0[0]
ldr $T1,[sp,#`($i+0)%16`*4]
eor $t0,$t0,$t3,ror#$sigma0[1]
ldr $t1,[sp,#`($i+9)%16`*4]
eor $t0,$t0,$t3,lsr#$sigma0[2] @ sigma0(X[i+1])
mov $t3,$t2,ror#$sigma1[0]
add $T1,$T1,$t0
eor $t3,$t3,$t2,ror#$sigma1[1]
add $T1,$T1,$t1
eor $t3,$t3,$t2,lsr#$sigma1[2] @ sigma1(X[i+14])
@ add $T1,$T1,$t3
___
&BODY_00_15(@_);
}
$code=<<___;
#include "arm_arch.h"
.text
.code 32
.type K256,%object
.align 5
K256:
.word 0x428a2f98,0x71374491,0xb5c0fbcf,0xe9b5dba5
.word 0x3956c25b,0x59f111f1,0x923f82a4,0xab1c5ed5
.word 0xd807aa98,0x12835b01,0x243185be,0x550c7dc3
.word 0x72be5d74,0x80deb1fe,0x9bdc06a7,0xc19bf174
.word 0xe49b69c1,0xefbe4786,0x0fc19dc6,0x240ca1cc
.word 0x2de92c6f,0x4a7484aa,0x5cb0a9dc,0x76f988da
.word 0x983e5152,0xa831c66d,0xb00327c8,0xbf597fc7
.word 0xc6e00bf3,0xd5a79147,0x06ca6351,0x14292967
.word 0x27b70a85,0x2e1b2138,0x4d2c6dfc,0x53380d13
.word 0x650a7354,0x766a0abb,0x81c2c92e,0x92722c85
.word 0xa2bfe8a1,0xa81a664b,0xc24b8b70,0xc76c51a3
.word 0xd192e819,0xd6990624,0xf40e3585,0x106aa070
.word 0x19a4c116,0x1e376c08,0x2748774c,0x34b0bcb5
.word 0x391c0cb3,0x4ed8aa4a,0x5b9cca4f,0x682e6ff3
.word 0x748f82ee,0x78a5636f,0x84c87814,0x8cc70208
.word 0x90befffa,0xa4506ceb,0xbef9a3f7,0xc67178f2
.size K256,.-K256
.global sha256_block_data_order
.type sha256_block_data_order,%function
sha256_block_data_order:
sub r3,pc,#8 @ sha256_block_data_order
add $len,$inp,$len,lsl#6 @ len to point at the end of inp
stmdb sp!,{$ctx,$inp,$len,r4-r11,lr}
ldmia $ctx,{$A,$B,$C,$D,$E,$F,$G,$H}
sub $Ktbl,r3,#256 @ K256
sub sp,sp,#16*4 @ alloca(X[16])
.Loop:
___
for($i=0;$i<16;$i++) { &BODY_00_15($i,@V); unshift(@V,pop(@V)); }
$code.=".Lrounds_16_xx:\n";
for (;$i<32;$i++) { &BODY_16_XX($i,@V); unshift(@V,pop(@V)); }
$code.=<<___;
and $t2,$t2,#0xff
cmp $t2,#0xf2
bne .Lrounds_16_xx
ldr $T1,[sp,#16*4] @ pull ctx
ldr $t0,[$T1,#0]
ldr $t1,[$T1,#4]
ldr $t2,[$T1,#8]
add $A,$A,$t0
ldr $t0,[$T1,#12]
add $B,$B,$t1
ldr $t1,[$T1,#16]
add $C,$C,$t2
ldr $t2,[$T1,#20]
add $D,$D,$t0
ldr $t0,[$T1,#24]
add $E,$E,$t1
ldr $t1,[$T1,#28]
add $F,$F,$t2
ldr $inp,[sp,#17*4] @ pull inp
ldr $t2,[sp,#18*4] @ pull inp+len
add $G,$G,$t0
add $H,$H,$t1
stmia $T1,{$A,$B,$C,$D,$E,$F,$G,$H}
cmp $inp,$t2
sub $Ktbl,$Ktbl,#256 @ rewind Ktbl
bne .Loop
add sp,sp,#`16+3`*4 @ destroy frame
#if __ARM_ARCH__>=5
ldmia sp!,{r4-r11,pc}
#else
ldmia sp!,{r4-r11,lr}
tst lr,#1
moveq pc,lr @ be binary compatible with V4, yet
bx lr @ interoperable with Thumb ISA:-)
#endif
.size sha256_block_data_order,.-sha256_block_data_order
.asciz "SHA256 block transform for ARMv4, CRYPTOGAMS by <appro\@openssl.org>"
.align 2
___
$code =~ s/\`([^\`]*)\`/eval $1/gem;
$code =~ s/\bbx\s+lr\b/.word\t0xe12fff1e/gm; # make it possible to compile with -march=armv4
print $code;
close STDOUT; # enforce flush
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