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openssl/crypto/sha/asm/sha256-armv4.pl

Index: openssl/crypto/sha/asm/sha256-armv4.pl
===================================================================
--- openssl/crypto/sha/asm/sha256-armv4.pl	(revision 0)
+++ openssl/crypto/sha/asm/sha256-armv4.pl	(revision 0)
@@ -0,0 +1,186 @@
+#!/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.
+
+while (($output=shift) && ($output!~/^\w[\w\-]*\.\w+$/)) {}
+open STDOUT,">$output";
+
+$ctx="r0";	$t0="r0";
+$inp="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);
+	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
+	`"str	$inp,[sp,#17*4]"	if ($i==15)`
+___
+$code.=<<___;
+	ldr	$t2,[$Ktbl],#4			@ *K256++
+	mov	$t0,$e,ror#$Sigma1[0]
+	str	$T1,[sp,#`$i%16`*4]
+	eor	$t0,$t0,$e,ror#$Sigma1[1]
+	eor	$t1,$f,$g
+	eor	$t0,$t0,$e,ror#$Sigma1[2]	@ Sigma1(e)
+	and	$t1,$t1,$e
+	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)
+	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	$t1,[sp,#`($i+1)%16`*4]		@ $i
+	ldr	$t2,[sp,#`($i+14)%16`*4]
+	ldr	$T1,[sp,#`($i+0)%16`*4]
+	mov	$t0,$t1,ror#$sigma0[0]
+	ldr	$inp,[sp,#`($i+9)%16`*4]
+	eor	$t0,$t0,$t1,ror#$sigma0[1]
+	eor	$t0,$t0,$t1,lsr#$sigma0[2]	@ sigma0(X[i+1])
+	mov	$t1,$t2,ror#$sigma1[0]
+	add	$T1,$T1,$t0
+	eor	$t1,$t1,$t2,ror#$sigma1[1]
+	add	$T1,$T1,$inp
+	eor	$t1,$t1,$t2,lsr#$sigma1[2]	@ sigma1(X[i+14])
+	add	$T1,$T1,$t1
+___
+	&BODY_00_15(@_);
+}
+
+$code=<<___;
+.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-r12,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
+	ldmia	sp!,{r4-r12,lr}
+	tst	lr,#1
+	moveq	pc,lr			@ be binary compatible with V4, yet
+	bx	lr			@ interoperable with Thumb ISA:-)
+.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