sub BODY_00_15()

in crypto/sha512-armv4.pl [91:186]

• 90 lines of code
• 1 McCabe index (conditional complexity)

sub BODY_00_15() {
my $magic = shift;
$code.=<<___;
	@ Sigma1(x)	(ROTR((x),14) ^ ROTR((x),18)  ^ ROTR((x),41))
	@ LO		lo>>14^hi<<18 ^ lo>>18^hi<<14 ^ hi>>9^lo<<23
	@ HI		hi>>14^lo<<18 ^ hi>>18^lo<<14 ^ lo>>9^hi<<23
	mov	$t0,$Elo,lsr#14
	str	$Tlo,[sp,#$Xoff+0]
	mov	$t1,$Ehi,lsr#14
	str	$Thi,[sp,#$Xoff+4]
	eor	$t0,$t0,$Ehi,lsl#18
	ldr	$t2,[sp,#$Hoff+0]	@ h.lo
	eor	$t1,$t1,$Elo,lsl#18
	ldr	$t3,[sp,#$Hoff+4]	@ h.hi
	eor	$t0,$t0,$Elo,lsr#18
	eor	$t1,$t1,$Ehi,lsr#18
	eor	$t0,$t0,$Ehi,lsl#14
	eor	$t1,$t1,$Elo,lsl#14
	eor	$t0,$t0,$Ehi,lsr#9
	eor	$t1,$t1,$Elo,lsr#9
	eor	$t0,$t0,$Elo,lsl#23
	eor	$t1,$t1,$Ehi,lsl#23	@ Sigma1(e)
	adds	$Tlo,$Tlo,$t0
	ldr	$t0,[sp,#$Foff+0]	@ f.lo
	adc	$Thi,$Thi,$t1		@ T += Sigma1(e)
	ldr	$t1,[sp,#$Foff+4]	@ f.hi
	adds	$Tlo,$Tlo,$t2
	ldr	$t2,[sp,#$Goff+0]	@ g.lo
	adc	$Thi,$Thi,$t3		@ T += h
	ldr	$t3,[sp,#$Goff+4]	@ g.hi

	eor	$t0,$t0,$t2
	str	$Elo,[sp,#$Eoff+0]
	eor	$t1,$t1,$t3
	str	$Ehi,[sp,#$Eoff+4]
	and	$t0,$t0,$Elo
	str	$Alo,[sp,#$Aoff+0]
	and	$t1,$t1,$Ehi
	str	$Ahi,[sp,#$Aoff+4]
	eor	$t0,$t0,$t2
	ldr	$t2,[$Ktbl,#$lo]	@ K[i].lo
	eor	$t1,$t1,$t3		@ Ch(e,f,g)
	ldr	$t3,[$Ktbl,#$hi]	@ K[i].hi

	adds	$Tlo,$Tlo,$t0
	ldr	$Elo,[sp,#$Doff+0]	@ d.lo
	adc	$Thi,$Thi,$t1		@ T += Ch(e,f,g)
	ldr	$Ehi,[sp,#$Doff+4]	@ d.hi
	adds	$Tlo,$Tlo,$t2
	and	$t0,$t2,#0xff
	adc	$Thi,$Thi,$t3		@ T += K[i]
	adds	$Elo,$Elo,$Tlo
	ldr	$t2,[sp,#$Boff+0]	@ b.lo
	adc	$Ehi,$Ehi,$Thi		@ d += T
	teq	$t0,#$magic

	ldr	$t3,[sp,#$Coff+0]	@ c.lo
#if __ARM_ARCH__>=7
	it	eq			@ Thumb2 thing, sanity check in ARM
#endif
	orreq	$Ktbl,$Ktbl,#1
	@ Sigma0(x)	(ROTR((x),28) ^ ROTR((x),34) ^ ROTR((x),39))
	@ LO		lo>>28^hi<<4  ^ hi>>2^lo<<30 ^ hi>>7^lo<<25
	@ HI		hi>>28^lo<<4  ^ lo>>2^hi<<30 ^ lo>>7^hi<<25
	mov	$t0,$Alo,lsr#28
	mov	$t1,$Ahi,lsr#28
	eor	$t0,$t0,$Ahi,lsl#4
	eor	$t1,$t1,$Alo,lsl#4
	eor	$t0,$t0,$Ahi,lsr#2
	eor	$t1,$t1,$Alo,lsr#2
	eor	$t0,$t0,$Alo,lsl#30
	eor	$t1,$t1,$Ahi,lsl#30
	eor	$t0,$t0,$Ahi,lsr#7
	eor	$t1,$t1,$Alo,lsr#7
	eor	$t0,$t0,$Alo,lsl#25
	eor	$t1,$t1,$Ahi,lsl#25	@ Sigma0(a)
	adds	$Tlo,$Tlo,$t0
	and	$t0,$Alo,$t2
	adc	$Thi,$Thi,$t1		@ T += Sigma0(a)

	ldr	$t1,[sp,#$Boff+4]	@ b.hi
	orr	$Alo,$Alo,$t2
	ldr	$t2,[sp,#$Coff+4]	@ c.hi
	and	$Alo,$Alo,$t3
	and	$t3,$Ahi,$t1
	orr	$Ahi,$Ahi,$t1
	orr	$Alo,$Alo,$t0		@ Maj(a,b,c).lo
	and	$Ahi,$Ahi,$t2
	adds	$Alo,$Alo,$Tlo
	orr	$Ahi,$Ahi,$t3		@ Maj(a,b,c).hi
	sub	sp,sp,#8
	adc	$Ahi,$Ahi,$Thi		@ h += T
	tst	$Ktbl,#1
	add	$Ktbl,$Ktbl,#8
___
}