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From: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
To: git@vger.kernel.org
Cc: "Junio C Hamano" <gitster@pobox.com>,
	"Marc Stevens" <marc@marc-stevens.nl>,
	"Michael Kebe" <michael.kebe@gmail.com>,
	"Jeff King" <peff@peff.net>, "Stefan Beller" <sbeller@google.com>,
	"Brandon Williams" <bmwill@google.com>,
	"Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Subject: [PATCH v2 2/2] sha1dc: optionally use sha1collisiondetection as a submodule
Date: Sat, 20 May 2017 11:54:29 +0000	[thread overview]
Message-ID: <20170520115429.12289-3-avarab@gmail.com> (raw)
In-Reply-To: <20170520115429.12289-1-avarab@gmail.com>
In-Reply-To: <xmqqpof3srw4.fsf@gitster.mtv.corp.google.com>

Add an option to use the sha1collisiondetection library from the
submodule in sha1collisiondetection/ instead of in the copy in the
sha1dc/ directory.

This allows us to try out the submodule in sha1collisiondetection
without breaking the build for anyone who's not expecting them as we
work out any kinks.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 .gitmodules            |  4 ++++
 Makefile               | 12 ++++++++++++
 hash.h                 |  4 ++++
 sha1collisiondetection |  1 +
 4 files changed, 21 insertions(+)
 create mode 100644 .gitmodules
 create mode 160000 sha1collisiondetection

diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000000..cbeebdab7a
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,4 @@
+[submodule "sha1collisiondetection"]
+	path = sha1collisiondetection
+	url = https://github.com/cr-marcstevens/sha1collisiondetection.git
+	branch = master
diff --git a/Makefile b/Makefile
index ffa6da71b7..6baad1669e 100644
--- a/Makefile
+++ b/Makefile
@@ -144,6 +144,12 @@ all::
 # algorithm. This is slower, but may detect attempted collision attacks.
 # Takes priority over other *_SHA1 knobs.
 #
+# Define DC_SHA1_SUBMODULE in addition to DC_SHA1 to use the
+# sha1collisiondetection shipped as a submodule instead of the
+# non-submodule copy in sha1dc/. This is an experimental option used
+# by the git project to migrate to using sha1collisiondetection as a
+# submodule.
+#
 # Define OPENSSL_SHA1 environment variable when running make to link
 # with the SHA1 routine from openssl library.
 #
@@ -1412,8 +1418,14 @@ ifdef APPLE_COMMON_CRYPTO
 	BASIC_CFLAGS += -DSHA1_APPLE
 else
 	DC_SHA1 := YesPlease
+ifdef DC_SHA1_SUBMODULE
+	LIB_OBJS += sha1collisiondetection/lib/sha1.o
+	LIB_OBJS += sha1collisiondetection/lib/ubc_check.o
+	BASIC_CFLAGS += -DDC_SHA1_SUBMODULE
+else
 	LIB_OBJS += sha1dc/sha1.o
 	LIB_OBJS += sha1dc/ubc_check.o
+endif
 	BASIC_CFLAGS += \
 		-DSHA1_DC \
 		-DSHA1DC_NO_STANDARD_INCLUDES \
diff --git a/hash.h b/hash.h
index a11fc9233f..bef3e630a0 100644
--- a/hash.h
+++ b/hash.h
@@ -8,7 +8,11 @@
 #elif defined(SHA1_OPENSSL)
 #include <openssl/sha.h>
 #elif defined(SHA1_DC)
+#ifdef DC_SHA1_SUBMODULE
+#include "sha1collisiondetection/lib/sha1.h"
+#else
 #include "sha1dc/sha1.h"
+#endif
 #else /* SHA1_BLK */
 #include "block-sha1/sha1.h"
 #endif
diff --git a/sha1collisiondetection b/sha1collisiondetection
new file mode 160000
index 0000000000..cc465543b3
--- /dev/null
+++ b/sha1collisiondetection
@@ -0,0 +1 @@
+Subproject commit cc465543b310e5f59a1d534381690052e8509b22
-- 
2.13.0.303.g4ebf302169


  parent reply	other threads:[~2017-05-20 11:54 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-05-18 21:28 [PATCH 0/3] Update sha1dc from upstream & optionally make it a submodule Ævar Arnfjörð Bjarmason
2017-05-18 21:28 ` [PATCH 1/3] sha1dc: update from upstream Ævar Arnfjörð Bjarmason
2017-05-18 21:28 ` [PATCH 2/3] sha1dc: use sha1collisiondetection as a submodule Ævar Arnfjörð Bjarmason
2017-05-20 11:13   ` Junio C Hamano
2017-05-20 11:54     ` [PATCH v2 0/2] Update sha1dc from upstream & optionally make it " Ævar Arnfjörð Bjarmason
2017-05-22 22:27       ` Junio C Hamano
2017-05-22 22:48         ` Stefan Beller
2017-05-23  3:22           ` Junio C Hamano
2017-05-23 10:55         ` Ævar Arnfjörð Bjarmason
2017-05-23 13:06           ` Junio C Hamano
2017-05-25 10:44             ` Ævar Arnfjörð Bjarmason
2017-05-25 23:31               ` Junio C Hamano
2017-05-20 11:54     ` [PATCH v2 1/2] sha1dc: update from upstream Ævar Arnfjörð Bjarmason
2017-05-20 11:54     ` Ævar Arnfjörð Bjarmason [this message]
2017-05-22  1:33       ` [PATCH v2 2/2] sha1dc: optionally use sha1collisiondetection as a submodule Junio C Hamano
2017-05-22  2:48         ` Junio C Hamano
2017-05-22  8:27           ` Ævar Arnfjörð Bjarmason
2017-05-22  8:48             ` Junio C Hamano
2017-05-25 10:47     ` [PATCH 2/3] sha1dc: " Ævar Arnfjörð Bjarmason
2017-05-18 21:28 ` [PATCH 3/3] sha1dc: remove the unused sha1dc/ directory Ævar Arnfjörð Bjarmason

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