text: #!/usr/bin/env perl
  #
  # ====================================================================
  # Written by Andy Polyakov <appro@openssl.org> 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/.
  # ====================================================================
  #
  # SHA1 for ARMv8.
  #
  # Performance in cycles per processed byte and improvement coefficient
  # over code generated with "default" compiler:
  #
  #		hardware-assisted	software(*)
  # Apple A7	2.31			4.13 (+14%)
  # Cortex-A53	2.24			8.03 (+97%)
  # Cortex-A57	2.35			7.88 (+74%)
  # Denver	2.13			3.97 (+0%)(**)
  # X-Gene				8.80 (+200%)
  #
  # (*)	Software results are presented mostly for reference purposes.
  # (**)	Keep in mind that Denver relies on binary translation, which
  #	optimizes compiler output at run-time.
  
  $flavour = shift;
  open STDOUT,">".shift;
  
  ($ctx,$inp,$num)=("x0","x1","x2");
  @Xw=map("w$_",(3..17,19));
  @Xx=map("x$_",(3..17,19));
  @V=($A,$B,$C,$D,$E)=map("w$_",(20..24));
  ($t0,$t1,$t2,$K)=map("w$_",(25..28));
  
  
  sub BODY_00_19 {
  my ($i,$a,$b,$c,$d,$e)=@_;
  my $j=($i+2)&15;
  
  $code.=<<___ if ($i<15 && !($i&1));
  	lsr	@Xx[$i+1],@Xx[$i],#32
  ___
  $code.=<<___ if ($i<14 && !($i&1));
  	ldr	@Xx[$i+2],[$inp,#`($i+2)*4-64`]
  ___
  $code.=<<___ if ($i<14 && ($i&1));
  #ifdef	__ARMEB__
  	ror	@Xx[$i+1],@Xx[$i+1],#32
  #else
  	rev32	@Xx[$i+1],@Xx[$i+1]
  #endif
  ___
  $code.=<<___ if ($i<14);
  	bic	$t0,$d,$b
  	and	$t1,$c,$b
  	ror	$t2,$a,#27
  	add	$d,$d,$K		// future e+=K
  	orr	$t0,$t0,$t1
  	add	$e,$e,$t2		// e+=rot(a,5)
  	ror	$b,$b,#2
  	add	$d,$d,@Xw[($i+1)&15]	// future e+=X[i]
  	add	$e,$e,$t0		// e+=F(b,c,d)
  ___
  $code.=<<___ if ($i==19);
  	movz	$K,#0xeba1
  	movk	$K,#0x6ed9,lsl#16
  ___
  $code.=<<___ if ($i>=14);
  	 eor	@Xw[$j],@Xw[$j],@Xw[($j+2)&15]
  	bic	$t0,$d,$b
  	and	$t1,$c,$b
  	ror	$t2,$a,#27
  	 eor	@Xw[$j],@Xw[$j],@Xw[($j+8)&15]
  	add	$d,$d,$K		// future e+=K
  	orr	$t0,$t0,$t1
  	add	$e,$e,$t2		// e+=rot(a,5)
  	 eor	@Xw[$j],@Xw[$j],@Xw[($j+13)&15]
  	ror	$b,$b,#2
  	add	$d,$d,@Xw[($i+1)&15]	// future e+=X[i]
  	add	$e,$e,$t0		// e+=F(b,c,d)
  	 ror	@Xw[$j],@Xw[$j],#31
  ___
  }
  
  sub BODY_40_59 {
  my ($i,$a,$b,$c,$d,$e)=@_;
  my $j=($i+2)&15;
  
  $code.=<<___ if ($i==59);
  	movz	$K,#0xc1d6
  	movk	$K,#0xca62,lsl#16
  ___
  $code.=<<___;
  	orr	$t0,$b,$c
  	and	$t1,$b,$c
  	 eor	@Xw[$j],@Xw[$j],@Xw[($j+2)&15]
  	ror	$t2,$a,#27
  	and	$t0,$t0,$d
  	add	$d,$d,$K		// future e+=K
  	 eor	@Xw[$j],@Xw[$j],@Xw[($j+8)&15]
  	add	$e,$e,$t2		// e+=rot(a,5)
  	orr	$t0,$t0,$t1
  	ror	$b,$b,#2
  	 eor	@Xw[$j],@Xw[$j],@Xw[($j+13)&15]
  	add	$d,$d,@Xw[($i+1)&15]	// future e+=X[i]
  	add	$e,$e,$t0		// e+=F(b,c,d)
  	 ror	@Xw[$j],@Xw[$j],#31
  ___
  }
  
  sub BODY_20_39 {
  my ($i,$a,$b,$c,$d,$e)=@_;
  my $j=($i+2)&15;
  
  $code.=<<___ if ($i==39);
  	movz	$K,#0xbcdc
  	movk	$K,#0x8f1b,lsl#16
  ___
  $code.=<<___ if ($i<78);
  	 eor	@Xw[$j],@Xw[$j],@Xw[($j+2)&15]
  	eor	$t0,$d,$b
  	ror	$t2,$a,#27
  	add	$d,$d,$K		// future e+=K
  	 eor	@Xw[$j],@Xw[$j],@Xw[($j+8)&15]
  	eor	$t0,$t0,$c
  	add	$e,$e,$t2		// e+=rot(a,5)
  	ror	$b,$b,#2
  	 eor	@Xw[$j],@Xw[$j],@Xw[($j+13)&15]
  	add	$d,$d,@Xw[($i+1)&15]	// future e+=X[i]
  	add	$e,$e,$t0		// e+=F(b,c,d)
  	 ror	@Xw[$j],@Xw[$j],#31
  ___
  $code.=<<___ if ($i==78);
  	ldp	@Xw[1],@Xw[2],[$ctx]
  	eor	$t0,$d,$b
  	ror	$t2,$a,#27
  	add	$d,$d,$K		// future e+=K
  	eor	$t0,$t0,$c
  	add	$e,$e,$t2		// e+=rot(a,5)
  	ror	$b,$b,#2
  	add	$d,$d,@Xw[($i+1)&15]	// future e+=X[i]
  	add	$e,$e,$t0		// e+=F(b,c,d)
  ___
  $code.=<<___ if ($i==79);
  	ldp	@Xw[3],@Xw[4],[$ctx,#8]
  	eor	$t0,$d,$b
  	ror	$t2,$a,#27
  	eor	$t0,$t0,$c
  	add	$e,$e,$t2		// e+=rot(a,5)
  	ror	$b,$b,#2
  	ldr	@Xw[5],[$ctx,#16]
  	add	$e,$e,$t0		// e+=F(b,c,d)
  ___
  }
  
  $code.=<<___;
  #include "arm_arch.h"
  
  .text
  
  .globl	sha1_block_data_order
  .type	sha1_block_data_order,%function
  .align	6
  sha1_block_data_order:
  	ldr	x16,.LOPENSSL_armcap_P
  	adr	x17,.LOPENSSL_armcap_P
  	add	x16,x16,x17
  	ldr	w16,[x16]
  	tst	w16,#ARMV8_SHA1
  	b.ne	.Lv8_entry
  
  	stp	x29,x30,[sp,#-96]!
  	add	x29,sp,#0
  	stp	x19,x20,[sp,#16]
  	stp	x21,x22,[sp,#32]
  	stp	x23,x24,[sp,#48]
  	stp	x25,x26,[sp,#64]
  	stp	x27,x28,[sp,#80]
  
  	ldp	$A,$B,[$ctx]
  	ldp	$C,$D,[$ctx,#8]
  	ldr	$E,[$ctx,#16]
  
  .Loop:
  	ldr	@Xx[0],[$inp],#64
  	movz	$K,#0x7999
  	sub	$num,$num,#1
  	movk	$K,#0x5a82,lsl#16
  #ifdef	__ARMEB__
  	ror	$Xx[0],@Xx[0],#32
  #else
  	rev32	@Xx[0],@Xx[0]
  #endif
  	add	$E,$E,$K		// warm it up
  	add	$E,$E,@Xw[0]
  ___
  for($i=0;$i<20;$i++)	{ &BODY_00_19($i,@V); unshift(@V,pop(@V)); }
  for(;$i<40;$i++)	{ &BODY_20_39($i,@V); unshift(@V,pop(@V)); }
  for(;$i<60;$i++)	{ &BODY_40_59($i,@V); unshift(@V,pop(@V)); }
  for(;$i<80;$i++)	{ &BODY_20_39($i,@V); unshift(@V,pop(@V)); }
  $code.=<<___;
  	add	$B,$B,@Xw[2]
  	add	$C,$C,@Xw[3]
  	add	$A,$A,@Xw[1]
  	add	$D,$D,@Xw[4]
  	add	$E,$E,@Xw[5]
  	stp	$A,$B,[$ctx]
  	stp	$C,$D,[$ctx,#8]
  	str	$E,[$ctx,#16]
  	cbnz	$num,.Loop
  
  	ldp	x19,x20,[sp,#16]
  	ldp	x21,x22,[sp,#32]
  	ldp	x23,x24,[sp,#48]
  	ldp	x25,x26,[sp,#64]
  	ldp	x27,x28,[sp,#80]
  	ldr	x29,[sp],#96
  	ret
  .size	sha1_block_data_order,.-sha1_block_data_order
  ___
  {{{
  my ($ABCD,$E,$E0,$E1)=map("v$_.16b",(0..3));
  my @MSG=map("v$_.16b",(4..7));
  my @Kxx=map("v$_.4s",(16..19));
  my ($W0,$W1)=("v20.4s","v21.4s");
  my $ABCD_SAVE="v22.16b";
  
  $code.=<<___;
  .type	sha1_block_armv8,%function
  .align	6
  sha1_block_armv8:
  .Lv8_entry:
  	stp	x29,x30,[sp,#-16]!
  	add	x29,sp,#0
  
  	adr	x4,.Lconst
  	eor	$E,$E,$E
  	ld1.32	{$ABCD},[$ctx],#16
  	ld1.32	{$E}[0],[$ctx]
  	sub	$ctx,$ctx,#16
  	ld1.32	{@Kxx[0]-@Kxx[3]},[x4]
  
  .Loop_hw:
  	ld1	{@MSG[0]-@MSG[3]},[$inp],#64
  	sub	$num,$num,#1
  	rev32	@MSG[0],@MSG[0]
  	rev32	@MSG[1],@MSG[1]
  
  	add.i32	$W0,@Kxx[0],@MSG[0]
  	rev32	@MSG[2],@MSG[2]
  	orr	$ABCD_SAVE,$ABCD,$ABCD	// offload
  
  	add.i32	$W1,@Kxx[0],@MSG[1]
  	rev32	@MSG[3],@MSG[3]
  	sha1h	$E1,$ABCD
  	sha1c	$ABCD,$E,$W0		// 0
  	add.i32	$W0,@Kxx[$j],@MSG[2]
  	sha1su0	@MSG[0],@MSG[1],@MSG[2]
  ___
  for ($j=0,$i=1;$i<20-3;$i++) {
  my $f=("c","p","m","p")[$i/5];
  $code.=<<___;
  	sha1h	$E0,$ABCD		// $i
  	sha1$f	$ABCD,$E1,$W1
  	add.i32	$W1,@Kxx[$j],@MSG[3]
  	sha1su1	@MSG[0],@MSG[3]
  ___
  $code.=<<___ if ($i<20-4);
  	sha1su0	@MSG[1],@MSG[2],@MSG[3]
  ___
  	($E0,$E1)=($E1,$E0);		($W0,$W1)=($W1,$W0);
  	push(@MSG,shift(@MSG));		$j++ if ((($i+3)%5)==0);
  }
  $code.=<<___;
  	sha1h	$E0,$ABCD		// $i
  	sha1p	$ABCD,$E1,$W1
  	add.i32	$W1,@Kxx[$j],@MSG[3]
  
  	sha1h	$E1,$ABCD		// 18
  	sha1p	$ABCD,$E0,$W0
  
  	sha1h	$E0,$ABCD		// 19
  	sha1p	$ABCD,$E1,$W1
  
  	add.i32	$E,$E,$E0
  	add.i32	$ABCD,$ABCD,$ABCD_SAVE
  
  	cbnz	$num,.Loop_hw
  
  	st1.32	{$ABCD},[$ctx],#16
  	st1.32	{$E}[0],[$ctx]
  
  	ldr	x29,[sp],#16
  	ret
  .size	sha1_block_armv8,.-sha1_block_armv8
  .align	6
  .Lconst:
  .long	0x5a827999,0x5a827999,0x5a827999,0x5a827999	//K_00_19
  .long	0x6ed9eba1,0x6ed9eba1,0x6ed9eba1,0x6ed9eba1	//K_20_39
  .long	0x8f1bbcdc,0x8f1bbcdc,0x8f1bbcdc,0x8f1bbcdc	//K_40_59
  .long	0xca62c1d6,0xca62c1d6,0xca62c1d6,0xca62c1d6	//K_60_79
  .LOPENSSL_armcap_P:
  .quad	OPENSSL_armcap_P-.
  .asciz	"SHA1 block transform for ARMv8, CRYPTOGAMS by <appro\@openssl.org>"
  .align	2
  .comm	OPENSSL_armcap_P,4,4
  ___
  }}}
  
  {   my	%opcode = (
  	"sha1c"		=> 0x5e000000,	"sha1p"		=> 0x5e001000,
  	"sha1m"		=> 0x5e002000,	"sha1su0"	=> 0x5e003000,
  	"sha1h"		=> 0x5e280800,	"sha1su1"	=> 0x5e281800	);
  
      sub unsha1 {
  	my ($mnemonic,$arg)=@_;
  
  	$arg =~ m/[qv]([0-9]+)[^,]*,\s*[qv]([0-9]+)[^,]*(?:,\s*[qv]([0-9]+))?/o
  	&&
  	sprintf ".inst\t0x%08x\t//%s %s",
  			$opcode{$mnemonic}|$1|($2<<5)|($3<<16),
  			$mnemonic,$arg;
      }
  }
  
  foreach(split("\n",$code)) {
  
  	s/\`([^\`]*)\`/eval($1)/geo;
  
  	s/\b(sha1\w+)\s+([qv].*)/unsha1($1,$2)/geo;
  
  	s/\.\w?32\b//o		and s/\.16b/\.4s/go;
  	m/(ld|st)1[^\[]+\[0\]/o	and s/\.4s/\.s/go;
  
  	print $_,"\n";
  }
  
  close STDOUT;
  