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sha256: add an SHA-256 implementation using libgcrypt

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Generally, one gets better performance out of cryptographic routines
written in assembly than C, and this is also true for SHA-256.  In
addition, most Linux distributions cannot distribute Git linked against
OpenSSL for licensing reasons.

Most systems with GnuPG will also have libgcrypt, since it is a
dependency of GnuPG.  libgcrypt is also faster than the SHA1DC
implementation for messages of a few KiB and larger.

For comparison, on a Core i7-6600U, this implementation processes 16 KiB
chunks at 355 MiB/s while SHA1DC processes equivalent chunks at 337
MiB/s.

In addition, libgcrypt is licensed under the LGPL 2.1, which is
compatible with the GPL.  Add an implementation of SHA-256 that uses
libgcrypt.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
brian m. carlson
2018-11-14 04:09:37 +00:00
committed by Junio C Hamano
parent 13eeedb5d1
commit 27dc04c545
3 changed files with 45 additions and 2 deletions
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4
hash.h
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@@ -15,7 +15,11 @@
#include "block-sha1/sha1.h"
#endif
#if defined(SHA256_GCRYPT)
#include "sha256/gcrypt.h"
#else
#include "sha256/block/sha256.h"
#endif
#ifndef platform_SHA_CTX
/*