--- /dev/null
+#!/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
projects / cassiopeia.git / blobdiff