eb7d2ed1fe
This change marks public symbols as dynamically exported. This means that it becomes viable to build a shared library of libcrypto and libssl with -fvisibility=hidden. On Windows, one not only needs to mark functions for export in a component, but also for import when using them from a different component. Because of this we have to build with |BORINGSSL_IMPLEMENTATION| defined when building the code. Other components, when including our headers, won't have that defined and then the |OPENSSL_EXPORT| tag becomes an import tag instead. See the #defines in base.h In the asm code, symbols are now hidden by default and those that need to be exported are wrapped by a C function. In order to support Chromium, a couple of libssl functions were moved to ssl.h from ssl_locl.h: ssl_get_new_session and ssl_update_cache. Change-Id: Ib4b76e2f1983ee066e7806c24721e8626d08a261 Reviewed-on: https://boringssl-review.googlesource.com/1350 Reviewed-by: Adam Langley <agl@google.com>
542 lines
14 KiB
Prolog
542 lines
14 KiB
Prolog
#!/usr/bin/env perl
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# ====================================================================
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# Written by Andy Polyakov <appro@openssl.org> for the OpenSSL
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# project. The module is, however, dual licensed under OpenSSL and
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# CRYPTOGAMS licenses depending on where you obtain it. For further
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# details see http://www.openssl.org/~appro/cryptogams/.
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# ====================================================================
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# SHA256 block procedure for ARMv4. May 2007.
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# Performance is ~2x better than gcc 3.4 generated code and in "abso-
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# lute" terms is ~2250 cycles per 64-byte block or ~35 cycles per
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# byte [on single-issue Xscale PXA250 core].
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# July 2010.
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#
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# Rescheduling for dual-issue pipeline resulted in 22% improvement on
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# Cortex A8 core and ~20 cycles per processed byte.
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# February 2011.
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#
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# Profiler-assisted and platform-specific optimization resulted in 16%
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# improvement on Cortex A8 core and ~15.4 cycles per processed byte.
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# September 2013.
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#
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# Add NEON implementation. On Cortex A8 it was measured to process one
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# byte in 12.5 cycles or 23% faster than integer-only code. Snapdragon
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# S4 does it in 12.5 cycles too, but it's 50% faster than integer-only
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# code (meaning that latter performs sub-optimally, nothing was done
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# about it).
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while (($output=shift) && ($output!~/^\w[\w\-]*\.\w+$/)) {}
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open STDOUT,">$output";
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$ctx="r0"; $t0="r0";
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$inp="r1"; $t4="r1";
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$len="r2"; $t1="r2";
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$T1="r3"; $t3="r3";
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$A="r4";
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$B="r5";
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$C="r6";
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$D="r7";
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$E="r8";
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$F="r9";
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$G="r10";
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$H="r11";
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@V=($A,$B,$C,$D,$E,$F,$G,$H);
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$t2="r12";
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$Ktbl="r14";
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@Sigma0=( 2,13,22);
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@Sigma1=( 6,11,25);
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@sigma0=( 7,18, 3);
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@sigma1=(17,19,10);
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sub BODY_00_15 {
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my ($i,$a,$b,$c,$d,$e,$f,$g,$h) = @_;
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$code.=<<___ if ($i<16);
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#if __ARM_ARCH__>=7
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@ ldr $t1,[$inp],#4 @ $i
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# if $i==15
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str $inp,[sp,#17*4] @ make room for $t4
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# endif
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eor $t0,$e,$e,ror#`$Sigma1[1]-$Sigma1[0]`
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add $a,$a,$t2 @ h+=Maj(a,b,c) from the past
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eor $t0,$t0,$e,ror#`$Sigma1[2]-$Sigma1[0]` @ Sigma1(e)
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rev $t1,$t1
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#else
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@ ldrb $t1,[$inp,#3] @ $i
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add $a,$a,$t2 @ h+=Maj(a,b,c) from the past
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ldrb $t2,[$inp,#2]
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ldrb $t0,[$inp,#1]
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orr $t1,$t1,$t2,lsl#8
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ldrb $t2,[$inp],#4
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orr $t1,$t1,$t0,lsl#16
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# if $i==15
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str $inp,[sp,#17*4] @ make room for $t4
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# endif
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eor $t0,$e,$e,ror#`$Sigma1[1]-$Sigma1[0]`
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orr $t1,$t1,$t2,lsl#24
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eor $t0,$t0,$e,ror#`$Sigma1[2]-$Sigma1[0]` @ Sigma1(e)
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#endif
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___
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$code.=<<___;
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ldr $t2,[$Ktbl],#4 @ *K256++
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add $h,$h,$t1 @ h+=X[i]
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str $t1,[sp,#`$i%16`*4]
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eor $t1,$f,$g
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add $h,$h,$t0,ror#$Sigma1[0] @ h+=Sigma1(e)
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and $t1,$t1,$e
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add $h,$h,$t2 @ h+=K256[i]
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eor $t1,$t1,$g @ Ch(e,f,g)
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eor $t0,$a,$a,ror#`$Sigma0[1]-$Sigma0[0]`
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add $h,$h,$t1 @ h+=Ch(e,f,g)
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#if $i==31
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and $t2,$t2,#0xff
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cmp $t2,#0xf2 @ done?
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#endif
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#if $i<15
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# if __ARM_ARCH__>=7
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ldr $t1,[$inp],#4 @ prefetch
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# else
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ldrb $t1,[$inp,#3]
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# endif
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eor $t2,$a,$b @ a^b, b^c in next round
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#else
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ldr $t1,[sp,#`($i+2)%16`*4] @ from future BODY_16_xx
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eor $t2,$a,$b @ a^b, b^c in next round
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ldr $t4,[sp,#`($i+15)%16`*4] @ from future BODY_16_xx
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#endif
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eor $t0,$t0,$a,ror#`$Sigma0[2]-$Sigma0[0]` @ Sigma0(a)
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and $t3,$t3,$t2 @ (b^c)&=(a^b)
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add $d,$d,$h @ d+=h
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eor $t3,$t3,$b @ Maj(a,b,c)
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add $h,$h,$t0,ror#$Sigma0[0] @ h+=Sigma0(a)
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@ add $h,$h,$t3 @ h+=Maj(a,b,c)
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___
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($t2,$t3)=($t3,$t2);
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}
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sub BODY_16_XX {
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my ($i,$a,$b,$c,$d,$e,$f,$g,$h) = @_;
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$code.=<<___;
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@ ldr $t1,[sp,#`($i+1)%16`*4] @ $i
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@ ldr $t4,[sp,#`($i+14)%16`*4]
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mov $t0,$t1,ror#$sigma0[0]
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add $a,$a,$t2 @ h+=Maj(a,b,c) from the past
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mov $t2,$t4,ror#$sigma1[0]
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eor $t0,$t0,$t1,ror#$sigma0[1]
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eor $t2,$t2,$t4,ror#$sigma1[1]
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eor $t0,$t0,$t1,lsr#$sigma0[2] @ sigma0(X[i+1])
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ldr $t1,[sp,#`($i+0)%16`*4]
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eor $t2,$t2,$t4,lsr#$sigma1[2] @ sigma1(X[i+14])
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ldr $t4,[sp,#`($i+9)%16`*4]
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add $t2,$t2,$t0
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eor $t0,$e,$e,ror#`$Sigma1[1]-$Sigma1[0]` @ from BODY_00_15
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add $t1,$t1,$t2
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eor $t0,$t0,$e,ror#`$Sigma1[2]-$Sigma1[0]` @ Sigma1(e)
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add $t1,$t1,$t4 @ X[i]
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___
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&BODY_00_15(@_);
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}
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$code=<<___;
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#if defined(__arm__)
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#include "arm_arch.h"
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.text
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.code 32
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.type K256,%object
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.align 5
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K256:
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.word 0x428a2f98,0x71374491,0xb5c0fbcf,0xe9b5dba5
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.word 0x3956c25b,0x59f111f1,0x923f82a4,0xab1c5ed5
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.word 0xd807aa98,0x12835b01,0x243185be,0x550c7dc3
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.word 0x72be5d74,0x80deb1fe,0x9bdc06a7,0xc19bf174
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.word 0xe49b69c1,0xefbe4786,0x0fc19dc6,0x240ca1cc
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.word 0x2de92c6f,0x4a7484aa,0x5cb0a9dc,0x76f988da
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.word 0x983e5152,0xa831c66d,0xb00327c8,0xbf597fc7
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.word 0xc6e00bf3,0xd5a79147,0x06ca6351,0x14292967
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.word 0x27b70a85,0x2e1b2138,0x4d2c6dfc,0x53380d13
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.word 0x650a7354,0x766a0abb,0x81c2c92e,0x92722c85
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.word 0xa2bfe8a1,0xa81a664b,0xc24b8b70,0xc76c51a3
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.word 0xd192e819,0xd6990624,0xf40e3585,0x106aa070
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.word 0x19a4c116,0x1e376c08,0x2748774c,0x34b0bcb5
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.word 0x391c0cb3,0x4ed8aa4a,0x5b9cca4f,0x682e6ff3
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.word 0x748f82ee,0x78a5636f,0x84c87814,0x8cc70208
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.word 0x90befffa,0xa4506ceb,0xbef9a3f7,0xc67178f2
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.size K256,.-K256
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.word 0 @ terminator
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.LOPENSSL_armcap:
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.word OPENSSL_armcap_P-sha256_block_data_order
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.align 5
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.global sha256_block_data_order
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.hidden sha256_block_data_order
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.type sha256_block_data_order,%function
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sha256_block_data_order:
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sub r3,pc,#8 @ sha256_block_data_order
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add $len,$inp,$len,lsl#6 @ len to point at the end of inp
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#if __ARM_ARCH__>=7
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ldr r12,.LOPENSSL_armcap
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ldr r12,[r3,r12] @ OPENSSL_armcap_P
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tst r12,#1
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bne .LNEON
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#endif
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stmdb sp!,{$ctx,$inp,$len,r4-r11,lr}
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ldmia $ctx,{$A,$B,$C,$D,$E,$F,$G,$H}
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sub $Ktbl,r3,#256+32 @ K256
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sub sp,sp,#16*4 @ alloca(X[16])
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.Loop:
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# if __ARM_ARCH__>=7
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ldr $t1,[$inp],#4
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# else
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ldrb $t1,[$inp,#3]
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# endif
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eor $t3,$B,$C @ magic
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eor $t2,$t2,$t2
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___
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for($i=0;$i<16;$i++) { &BODY_00_15($i,@V); unshift(@V,pop(@V)); }
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$code.=".Lrounds_16_xx:\n";
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for (;$i<32;$i++) { &BODY_16_XX($i,@V); unshift(@V,pop(@V)); }
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$code.=<<___;
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ldreq $t3,[sp,#16*4] @ pull ctx
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bne .Lrounds_16_xx
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add $A,$A,$t2 @ h+=Maj(a,b,c) from the past
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ldr $t0,[$t3,#0]
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ldr $t1,[$t3,#4]
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ldr $t2,[$t3,#8]
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add $A,$A,$t0
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ldr $t0,[$t3,#12]
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add $B,$B,$t1
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ldr $t1,[$t3,#16]
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add $C,$C,$t2
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ldr $t2,[$t3,#20]
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add $D,$D,$t0
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ldr $t0,[$t3,#24]
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add $E,$E,$t1
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ldr $t1,[$t3,#28]
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add $F,$F,$t2
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ldr $inp,[sp,#17*4] @ pull inp
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ldr $t2,[sp,#18*4] @ pull inp+len
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add $G,$G,$t0
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add $H,$H,$t1
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stmia $t3,{$A,$B,$C,$D,$E,$F,$G,$H}
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cmp $inp,$t2
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sub $Ktbl,$Ktbl,#256 @ rewind Ktbl
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bne .Loop
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add sp,sp,#`16+3`*4 @ destroy frame
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#if __ARM_ARCH__>=5
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ldmia sp!,{r4-r11,pc}
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#else
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ldmia sp!,{r4-r11,lr}
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tst lr,#1
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moveq pc,lr @ be binary compatible with V4, yet
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bx lr @ interoperable with Thumb ISA:-)
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#endif
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___
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######################################################################
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# NEON stuff
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#
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{{{
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my @X=map("q$_",(0..3));
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my ($T0,$T1,$T2,$T3,$T4,$T5)=("q8","q9","q10","q11","d24","d25");
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my $Xfer=$t4;
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my $j=0;
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sub Dlo() { shift=~m|q([1]?[0-9])|?"d".($1*2):""; }
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sub Dhi() { shift=~m|q([1]?[0-9])|?"d".($1*2+1):""; }
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sub AUTOLOAD() # thunk [simplified] x86-style perlasm
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{ my $opcode = $AUTOLOAD; $opcode =~ s/.*:://; $opcode =~ s/_/\./;
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my $arg = pop;
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$arg = "#$arg" if ($arg*1 eq $arg);
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$code .= "\t$opcode\t".join(',',@_,$arg)."\n";
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}
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sub Xupdate()
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{ use integer;
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my $body = shift;
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my @insns = (&$body,&$body,&$body,&$body);
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my ($a,$b,$c,$d,$e,$f,$g,$h);
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&vext_8 ($T0,@X[0],@X[1],4); # X[1..4]
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eval(shift(@insns));
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eval(shift(@insns));
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eval(shift(@insns));
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&vext_8 ($T1,@X[2],@X[3],4); # X[9..12]
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eval(shift(@insns));
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eval(shift(@insns));
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eval(shift(@insns));
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&vshr_u32 ($T2,$T0,$sigma0[0]);
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eval(shift(@insns));
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eval(shift(@insns));
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&vadd_i32 (@X[0],@X[0],$T1); # X[0..3] += X[9..12]
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eval(shift(@insns));
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eval(shift(@insns));
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&vshr_u32 ($T1,$T0,$sigma0[2]);
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eval(shift(@insns));
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eval(shift(@insns));
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&vsli_32 ($T2,$T0,32-$sigma0[0]);
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eval(shift(@insns));
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eval(shift(@insns));
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&vshr_u32 ($T3,$T0,$sigma0[1]);
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eval(shift(@insns));
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eval(shift(@insns));
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&veor ($T1,$T1,$T2);
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eval(shift(@insns));
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eval(shift(@insns));
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&vsli_32 ($T3,$T0,32-$sigma0[1]);
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eval(shift(@insns));
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eval(shift(@insns));
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&vshr_u32 ($T4,&Dhi(@X[3]),$sigma1[0]);
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eval(shift(@insns));
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eval(shift(@insns));
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&veor ($T1,$T1,$T3); # sigma0(X[1..4])
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eval(shift(@insns));
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eval(shift(@insns));
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&vsli_32 ($T4,&Dhi(@X[3]),32-$sigma1[0]);
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eval(shift(@insns));
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eval(shift(@insns));
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&vshr_u32 ($T5,&Dhi(@X[3]),$sigma1[2]);
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eval(shift(@insns));
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eval(shift(@insns));
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&vadd_i32 (@X[0],@X[0],$T1); # X[0..3] += sigma0(X[1..4])
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eval(shift(@insns));
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eval(shift(@insns));
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&veor ($T5,$T5,$T4);
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eval(shift(@insns));
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eval(shift(@insns));
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&vshr_u32 ($T4,&Dhi(@X[3]),$sigma1[1]);
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eval(shift(@insns));
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eval(shift(@insns));
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&vsli_32 ($T4,&Dhi(@X[3]),32-$sigma1[1]);
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eval(shift(@insns));
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eval(shift(@insns));
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&veor ($T5,$T5,$T4); # sigma1(X[14..15])
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eval(shift(@insns));
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eval(shift(@insns));
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&vadd_i32 (&Dlo(@X[0]),&Dlo(@X[0]),$T5);# X[0..1] += sigma1(X[14..15])
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eval(shift(@insns));
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eval(shift(@insns));
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&vshr_u32 ($T4,&Dlo(@X[0]),$sigma1[0]);
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eval(shift(@insns));
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eval(shift(@insns));
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&vsli_32 ($T4,&Dlo(@X[0]),32-$sigma1[0]);
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eval(shift(@insns));
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eval(shift(@insns));
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&vshr_u32 ($T5,&Dlo(@X[0]),$sigma1[2]);
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eval(shift(@insns));
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eval(shift(@insns));
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&veor ($T5,$T5,$T4);
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eval(shift(@insns));
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eval(shift(@insns));
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&vshr_u32 ($T4,&Dlo(@X[0]),$sigma1[1]);
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eval(shift(@insns));
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eval(shift(@insns));
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&vld1_32 ("{$T0}","[$Ktbl,:128]!");
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eval(shift(@insns));
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eval(shift(@insns));
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&vsli_32 ($T4,&Dlo(@X[0]),32-$sigma1[1]);
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eval(shift(@insns));
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eval(shift(@insns));
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&veor ($T5,$T5,$T4); # sigma1(X[16..17])
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eval(shift(@insns));
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eval(shift(@insns));
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&vadd_i32 (&Dhi(@X[0]),&Dhi(@X[0]),$T5);# X[2..3] += sigma1(X[16..17])
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eval(shift(@insns));
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eval(shift(@insns));
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&vadd_i32 ($T0,$T0,@X[0]);
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while($#insns>=2) { eval(shift(@insns)); }
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&vst1_32 ("{$T0}","[$Xfer,:128]!");
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eval(shift(@insns));
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eval(shift(@insns));
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push(@X,shift(@X)); # "rotate" X[]
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}
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sub Xpreload()
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{ use integer;
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my $body = shift;
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my @insns = (&$body,&$body,&$body,&$body);
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my ($a,$b,$c,$d,$e,$f,$g,$h);
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eval(shift(@insns));
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eval(shift(@insns));
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eval(shift(@insns));
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eval(shift(@insns));
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&vld1_32 ("{$T0}","[$Ktbl,:128]!");
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eval(shift(@insns));
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eval(shift(@insns));
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eval(shift(@insns));
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eval(shift(@insns));
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&vrev32_8 (@X[0],@X[0]);
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eval(shift(@insns));
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eval(shift(@insns));
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eval(shift(@insns));
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eval(shift(@insns));
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&vadd_i32 ($T0,$T0,@X[0]);
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foreach (@insns) { eval; } # remaining instructions
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&vst1_32 ("{$T0}","[$Xfer,:128]!");
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push(@X,shift(@X)); # "rotate" X[]
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}
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sub body_00_15 () {
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(
|
|
'($a,$b,$c,$d,$e,$f,$g,$h)=@V;'.
|
|
'&add ($h,$h,$t1)', # h+=X[i]+K[i]
|
|
'&eor ($t1,$f,$g)',
|
|
'&eor ($t0,$e,$e,"ror#".($Sigma1[1]-$Sigma1[0]))',
|
|
'&add ($a,$a,$t2)', # h+=Maj(a,b,c) from the past
|
|
'&and ($t1,$t1,$e)',
|
|
'&eor ($t2,$t0,$e,"ror#".($Sigma1[2]-$Sigma1[0]))', # Sigma1(e)
|
|
'&eor ($t0,$a,$a,"ror#".($Sigma0[1]-$Sigma0[0]))',
|
|
'&eor ($t1,$t1,$g)', # Ch(e,f,g)
|
|
'&add ($h,$h,$t2,"ror#$Sigma1[0]")', # h+=Sigma1(e)
|
|
'&eor ($t2,$a,$b)', # a^b, b^c in next round
|
|
'&eor ($t0,$t0,$a,"ror#".($Sigma0[2]-$Sigma0[0]))', # Sigma0(a)
|
|
'&add ($h,$h,$t1)', # h+=Ch(e,f,g)
|
|
'&ldr ($t1,sprintf "[sp,#%d]",4*(($j+1)&15)) if (($j&15)!=15);'.
|
|
'&ldr ($t1,"[$Ktbl]") if ($j==15);'.
|
|
'&ldr ($t1,"[sp,#64]") if ($j==31)',
|
|
'&and ($t3,$t3,$t2)', # (b^c)&=(a^b)
|
|
'&add ($d,$d,$h)', # d+=h
|
|
'&add ($h,$h,$t0,"ror#$Sigma0[0]");'. # h+=Sigma0(a)
|
|
'&eor ($t3,$t3,$b)', # Maj(a,b,c)
|
|
'$j++; unshift(@V,pop(@V)); ($t2,$t3)=($t3,$t2);'
|
|
)
|
|
}
|
|
|
|
$code.=<<___;
|
|
#if __ARM_ARCH__>=7
|
|
.fpu neon
|
|
.align 4
|
|
.LNEON:
|
|
stmdb sp!,{r4-r12,lr}
|
|
|
|
mov $t2,sp
|
|
sub sp,sp,#16*4+16 @ alloca
|
|
sub $Ktbl,r3,#256+32 @ K256
|
|
bic sp,sp,#15 @ align for 128-bit stores
|
|
|
|
vld1.8 {@X[0]},[$inp]!
|
|
vld1.8 {@X[1]},[$inp]!
|
|
vld1.8 {@X[2]},[$inp]!
|
|
vld1.8 {@X[3]},[$inp]!
|
|
vld1.32 {$T0},[$Ktbl,:128]!
|
|
vld1.32 {$T1},[$Ktbl,:128]!
|
|
vld1.32 {$T2},[$Ktbl,:128]!
|
|
vld1.32 {$T3},[$Ktbl,:128]!
|
|
vrev32.8 @X[0],@X[0] @ yes, even on
|
|
str $ctx,[sp,#64]
|
|
vrev32.8 @X[1],@X[1] @ big-endian
|
|
str $inp,[sp,#68]
|
|
mov $Xfer,sp
|
|
vrev32.8 @X[2],@X[2]
|
|
str $len,[sp,#72]
|
|
vrev32.8 @X[3],@X[3]
|
|
str $t2,[sp,#76] @ save original sp
|
|
vadd.i32 $T0,$T0,@X[0]
|
|
vadd.i32 $T1,$T1,@X[1]
|
|
vst1.32 {$T0},[$Xfer,:128]!
|
|
vadd.i32 $T2,$T2,@X[2]
|
|
vst1.32 {$T1},[$Xfer,:128]!
|
|
vadd.i32 $T3,$T3,@X[3]
|
|
vst1.32 {$T2},[$Xfer,:128]!
|
|
vst1.32 {$T3},[$Xfer,:128]!
|
|
|
|
ldmia $ctx,{$A-$H}
|
|
sub $Xfer,$Xfer,#64
|
|
ldr $t1,[sp,#0]
|
|
eor $t2,$t2,$t2
|
|
eor $t3,$B,$C
|
|
b .L_00_48
|
|
|
|
.align 4
|
|
.L_00_48:
|
|
___
|
|
&Xupdate(\&body_00_15);
|
|
&Xupdate(\&body_00_15);
|
|
&Xupdate(\&body_00_15);
|
|
&Xupdate(\&body_00_15);
|
|
$code.=<<___;
|
|
teq $t1,#0 @ check for K256 terminator
|
|
ldr $t1,[sp,#0]
|
|
sub $Xfer,$Xfer,#64
|
|
bne .L_00_48
|
|
|
|
ldr $inp,[sp,#68]
|
|
ldr $t0,[sp,#72]
|
|
sub $Ktbl,$Ktbl,#256 @ rewind $Ktbl
|
|
teq $inp,$t0
|
|
subeq $inp,$inp,#64 @ avoid SEGV
|
|
vld1.8 {@X[0]},[$inp]! @ load next input block
|
|
vld1.8 {@X[1]},[$inp]!
|
|
vld1.8 {@X[2]},[$inp]!
|
|
vld1.8 {@X[3]},[$inp]!
|
|
strne $inp,[sp,#68]
|
|
mov $Xfer,sp
|
|
___
|
|
&Xpreload(\&body_00_15);
|
|
&Xpreload(\&body_00_15);
|
|
&Xpreload(\&body_00_15);
|
|
&Xpreload(\&body_00_15);
|
|
$code.=<<___;
|
|
ldr $t0,[$t1,#0]
|
|
add $A,$A,$t2 @ h+=Maj(a,b,c) from the past
|
|
ldr $t2,[$t1,#4]
|
|
ldr $t3,[$t1,#8]
|
|
ldr $t4,[$t1,#12]
|
|
add $A,$A,$t0 @ accumulate
|
|
ldr $t0,[$t1,#16]
|
|
add $B,$B,$t2
|
|
ldr $t2,[$t1,#20]
|
|
add $C,$C,$t3
|
|
ldr $t3,[$t1,#24]
|
|
add $D,$D,$t4
|
|
ldr $t4,[$t1,#28]
|
|
add $E,$E,$t0
|
|
str $A,[$t1],#4
|
|
add $F,$F,$t2
|
|
str $B,[$t1],#4
|
|
add $G,$G,$t3
|
|
str $C,[$t1],#4
|
|
add $H,$H,$t4
|
|
str $D,[$t1],#4
|
|
stmia $t1,{$E-$H}
|
|
|
|
movne $Xfer,sp
|
|
ldrne $t1,[sp,#0]
|
|
eorne $t2,$t2,$t2
|
|
ldreq sp,[sp,#76] @ restore original sp
|
|
eorne $t3,$B,$C
|
|
bne .L_00_48
|
|
|
|
ldmia sp!,{r4-r12,pc}
|
|
#endif
|
|
___
|
|
}}}
|
|
$code.=<<___;
|
|
.size sha256_block_data_order,.-sha256_block_data_order
|
|
.asciz "SHA256 block transform for ARMv4/NEON, CRYPTOGAMS by <appro\@openssl.org>"
|
|
.align 2
|
|
.comm OPENSSL_armcap_P,4,4
|
|
|
|
#endif
|
|
___
|
|
|
|
$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
|