[PATCHv2] arm: crypto: Add optimized SHA-256/224

[appro@openssl.org (Andy Polyakov)]

>>>> arch/arm/crypto/sha256-core.S: Assembler messages:
>>>> arch/arm/crypto/sha256-core.S:1847: Error: invalid constant (ffffefb0)
>>>> after fixup
>>>>
>>>> This is caused by the fact that, when building the integer-only code
>>>> for an older architecture, the conditional compilation produces a
>>>> slightly bigger preceding function, and the symbol K256 is out of
>>>> range for the adr instruction.
>>>>
>>>> ... and replace the offending line with
>>>>
>>>> adrl r14,K256
>>>
>>> Ard, you have mentioned that you've verified it on big-endian, but I've
>>> spotted little-endian dependency (see #ifndef __ARMEB__ in attached). I
>>> guess that it worked for you either because it was NEON that was tested
>>> (it does work as is) or __LINUX_ARM_ARCH__ was less than 7 (in which
>>> case it uses endian-neutral byte-by-byte data load). Can you confirm either?
> 
> Indeed, if I build for v7 I get
> 
> [    0.269418] 00000000: 4e a5 c5 08 a6 56 6e 76 24 05 43 f8 fe b0 6f d4
> [    0.275261] 00000010: 57 77 7b e3 95 49 c4 01 64 36 af da 65 d2 33 0e
> [    0.281031] alg: hash: Test 1 failed for sha224-asm
> [    0.285315] 00000000: 9d 6a 5d e9 e1 6c 39 99 c7 14 84 0f 47 77 1f 36
> [    0.290912] 00000010: dc c2 97 a7 bd ef aa c3 6c 95 15 ae
> 
> which is indeed the integer code failing, and your attached patch fixes it.

Committed as
http://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=51f8d095562f36cdaa6893597b5c609e943b0565.