GNUTLS uses the same cryptograms SHA1 routines (Cryptograms)
by Andy Polyakov <appro@xxxxxxxxxxx> as OpenSSL, but with a license
that is acceptable for downstream packagers.
This is not the cleanest way to use the GNUTLS library,
as it is reallocating the context every time, and GNUTLS itsself
fudges an OpenSSL CTX to use the cryptograms code, HOWEVER
in my benchmarks the code performs as well as both the OpenSSL library,
and my own integration of cryptograms with git.
I think this is preferrable to bringing the assembly routines into
the git code-base, as a way of getting access to these high-performance
routines to a git available in Debian, Ubuntu, or Fedora (which
all use BLK_SHA1=1 due to GPLv2 + OpenSSL license considerations,
see Debian Bug #879459).
I struggle with autotools, and I suspect something is wrong with that
part of the patch.
This laptop is ancient, Intel(R) Core(TM) i5 CPU M 520.
When I get arm64 hardware in a week I will update with new benchmarks.
Builtin (BLK_SHA1=1):
~/git/git$ time git fsck
Checking object directories: 100% (256/256), done.
Checking objects: 100% (238410/238410), done.
Checking connectivity: 236605, done.
real 0m25.806s
user 0m25.187s
sys 0m0.579s
This patch:
~/git/git$ time ./git fsck
Checking object directories: 100% (256/256), done.
Checking objects: 100% (238410/238410), done.
Checking connectivity: 236606, done.
real 0m22.368s
user 0m21.790s
sys 0m0.539s
Signed-off-by: Shawn Landden <slandden@xxxxxxxxx>
---
Makefile | 10 ++++++++++
configure.ac | 31 +++++++++++++++++++++++++++++++
gnutls-sha1/sha1.c | 25 +++++++++++++++++++++++++
gnutls-sha1/sha1.h | 12 ++++++++++++
hash.h | 2 ++
5 files changed, 80 insertions(+)
create mode 100644 gnutls-sha1/sha1.c
create mode 100644 gnutls-sha1/sha1.h
diff --git a/Makefile b/Makefile
index cd7598599..e23648dbd 100644
--- a/Makefile
+++ b/Makefile
@@ -1252,7 +1252,9 @@ ifndef NO_OPENSSL
endif
else
BASIC_CFLAGS += -DNO_OPENSSL
+ifndef GNUTLS_SHA1
BLK_SHA1 = 1
+endif
OPENSSL_LIBSSL =
endif
ifdef NO_OPENSSL
@@ -1481,6 +1483,11 @@ ifdef BLK_SHA1
LIB_OBJS += block-sha1/sha1.o
BASIC_CFLAGS += -DSHA1_BLK
else
+ifdef GNUTLS_SHA1
+ LIB_OBJS += gnutls-sha1/sha1.o
+ BASIC_CFLAGS += -DSHA1_GNUTLS
+ EXTLIBS += -lgnutls
+endif
ifdef PPC_SHA1
LIB_OBJS += ppc/sha1.o ppc/sha1ppc.o
BASIC_CFLAGS += -DSHA1_PPC
@@ -1488,6 +1495,8 @@ else
ifdef APPLE_COMMON_CRYPTO
COMPAT_CFLAGS += -DCOMMON_DIGEST_FOR_OPENSSL
BASIC_CFLAGS += -DSHA1_APPLE
+else
+ifdef GNUTLS_SHA1
else
DC_SHA1 := YesPlease
BASIC_CFLAGS += -DSHA1_DC
@@ -1506,6 +1515,7 @@ ifdef DC_SHA1_SUBMODULE
else
LIB_OBJS += sha1dc/sha1.o
LIB_OBJS += sha1dc/ubc_check.o
+endif
endif
BASIC_CFLAGS += \
-DSHA1DC_NO_STANDARD_INCLUDES \
diff --git a/configure.ac b/configure.ac
index 2f55237e6..109c4758d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -250,6 +250,23 @@ AS_HELP_STRING([--with-openssl],[use OpenSSL library (default is YES)])
AS_HELP_STRING([], [ARG can be prefix for openssl library and headers]),
GIT_PARSE_WITH([openssl]))
+# Define GNUTLS_SHA1 if you have and want to use libgnutls. This offers
+# similar sha1 routines as openssl.
+AC_ARG_WITH(gnutls,
+AS_HELP_STRING([--with-gnutls],[use GNUTLS library (default is YES)]),
+ if test "$withval" = "no"; then
+ USE_GNUTLS=
+ elif test "$withval" = "yes"; then
+ USE_GNUTLS=YesPlease
+ else
+ USE_GNUTLS=YesPlease
+ LIBGNUTLSDIR=$withval
+ AC_MSG_NOTICE([Setting LIBGNUTLSDIR to $LIBGNUTLSDIR])
+ dnl USE_LIBGNUTLS can still be modified below, so don't substitute
+ dnl it yet.
+ GIT_CONF_SUBST([LIBGNUTLSDIR])
+ fi)
+
# Define USE_LIBPCRE if you have and want to use libpcre. Various
# commands such as log and grep offer runtime options to use
# Perl-compatible regular expressions instead of standard or extended
@@ -540,6 +557,20 @@ GIT_UNSTASH_FLAGS($OPENSSLDIR)
GIT_CONF_SUBST([NEEDS_SSL_WITH_CRYPTO])
GIT_CONF_SUBST([NO_OPENSSL])
+#
+# Handle USE_GNUTLS from above
+#
+if test -n "$USE_GNUTLS"; then
+
+GIT_STASH_FLAGS($LIBGNUTLSDIR)
+
+AC_CHECK_LIB([gnutls], [gnutls_hash_init],
+[GNUTLS_SHA1=YesPlease],
+[GNUTLS_SHA1=])
+
+GIT_UNSTASH_FLAGS($LIBGNUTLSDIR)
+
+fi
#
# Handle the USE_LIBPCRE1 and USE_LIBPCRE2 options potentially set
# above.
diff --git a/gnutls-sha1/sha1.c b/gnutls-sha1/sha1.c
new file mode 100644
index 000000000..f7ede4ddf
--- /dev/null
+++ b/gnutls-sha1/sha1.c
@@ -0,0 +1,25 @@
+/* this is only to get definitions for memcpy(), ntohl() and htonl() */
+#include "../git-compat-util.h"
+
+#include <gnutls/gnutls.h>
+#include <gnutls/crypto.h>
+
+#include "sha1.h"
+
+void gnutls_SHA1_Init(gnutls_SHA_CTX *ctx)
+{
+ int ret;
+ ret = gnutls_hash_init((void *) &ctx->handle, GNUTLS_DIG_SHA1);
+ if (ret < 0)
+ abort();
+}
+
+void gnutls_SHA1_Update(gnutls_SHA_CTX *ctx, const void *data, unsigned long len)
+{
+ gnutls_hash(ctx->handle, data, len);
+}
+
+void gnutls_SHA1_Final(unsigned char hashout[20], gnutls_SHA_CTX *ctx)
+{
+ gnutls_hash_deinit(ctx->handle, hashout);
+}
diff --git a/gnutls-sha1/sha1.h b/gnutls-sha1/sha1.h
new file mode 100644
index 000000000..ade60fcbe
--- /dev/null
+++ b/gnutls-sha1/sha1.h
@@ -0,0 +1,12 @@
+typedef struct {
+ void *handle;
+} gnutls_SHA_CTX;
+
+void gnutls_SHA1_Init(gnutls_SHA_CTX *ctx);
+void gnutls_SHA1_Update(gnutls_SHA_CTX *ctx, const void *dataIn, unsigned long len);
+void gnutls_SHA1_Final(unsigned char hashout[20], gnutls_SHA_CTX *ctx);
+
+#define platform_SHA_CTX gnutls_SHA_CTX
+#define platform_SHA1_Init gnutls_SHA1_Init
+#define platform_SHA1_Update gnutls_SHA1_Update
+#define platform_SHA1_Final gnutls_SHA1_Final
diff --git a/hash.h b/hash.h
index 024d0d3d5..7e5e307fc 100644
--- a/hash.h
+++ b/hash.h
@@ -9,6 +9,8 @@
#include <openssl/sha.h>
#elif defined(SHA1_DC)
#include "sha1dc_git.h"
+#elif defined(SHA1_GNUTLS)
+#include "gnutls-sha1/sha1.h"
#else /* SHA1_BLK */
#include "block-sha1/sha1.h"
#endif
--
2.15.0.rc2
