From: Atousa Pahlevan Duprat <apahle...@ieee.org>
Some implementations of SHA_Updates have inherent limits
on the max chunk size. SHA1_MAX_BLOCK_SIZE can be defined
to set the max chunk size supported, if required. This is
enabled for OSX CommonCrypto library and set to 1GiB.
Signed-off-by: Atousa Pahlevan Duprat <apahle...@ieee.org>
---
Makefile | 16 +++++++++++++++-
block-sha1/sha1.h | 2 +-
cache.h | 17 +++++++++++++----
compat/apple-common-crypto.h | 4 ++++
compat/sha1_chunked.c | 19 +++++++++++++++++++
5 files changed, 52 insertions(+), 6 deletions(-)
create mode 100644 compat/sha1_chunked.c
diff --git a/Makefile b/Makefile
index 04c2231..1b098cc 100644
--- a/Makefile
+++ b/Makefile
@@ -136,11 +136,15 @@ all::
# to provide your own OpenSSL library, for example from MacPorts.
#
# Define BLK_SHA1 environment variable to make use of the bundled
-# optimized C SHA1 routine.
+# optimized C SHA1 routine. This implies NO_APPLE_COMMON_CRYPTO.
#
# Define PPC_SHA1 environment variable when running make to make use of
# a bundled SHA1 routine optimized for PowerPC.
#
+# Define SHA1_MAX_BLOCK_SIZE if your SSH1_Update() implementation can
+# hash only a limited amount of data in one call (e.g. APPLE_COMMON_CRYPTO
+# may want 'SHA1_MAX_BLOCK_SIZE=1024L*1024L*1024L' defined).
+#
# Define NEEDS_CRYPTO_WITH_SSL if you need -lcrypto when using -lssl (Darwin).
#
# Define NEEDS_SSL_WITH_CRYPTO if you need -lssl when using -lcrypto (Darwin).
@@ -986,6 +990,10 @@ ifeq (no,$(USE_PARENS_AROUND_GETTEXT_N))
endif
endif
+ifdef BLK_SHA1
+ NO_APPLE_COMMON_CRYPTO=1
+endif
+
ifeq ($(uname_S),Darwin)
ifndef NO_FINK
ifeq ($(shell test -d /sw/lib && echo y),y)
@@ -1346,6 +1354,8 @@ else
ifdef APPLE_COMMON_CRYPTO
COMPAT_CFLAGS += -DCOMMON_DIGEST_FOR_OPENSSL
SHA1_HEADER = <CommonCrypto/CommonDigest.h>
+ # Apple CommonCrypto requires chunking
+ SHA1_MAX_BLOCK_SIZE = 1024L*1024L*1024L
else
SHA1_HEADER = <openssl/sha.h>
EXTLIBS += $(LIB_4_CRYPTO)
@@ -1353,6 +1363,10 @@ endif
endif
endif
+ifdef SHA1_MAX_BLOCK_SIZE
+ LIB_OBJS += compat/sha1_chunked.o
+ BASIC_CFLAGS += -DSHA1_MAX_BLOCK_SIZE="$(SHA1_MAX_BLOCK_SIZE)"
+endif
ifdef NO_PERL_MAKEMAKER
export NO_PERL_MAKEMAKER
endif
diff --git a/block-sha1/sha1.h b/block-sha1/sha1.h
index b864df6..d085412 100644
--- a/block-sha1/sha1.h
+++ b/block-sha1/sha1.h
@@ -18,5 +18,5 @@ void blk_SHA1_Final(unsigned char hashout[20], blk_SHA_CTX
*ctx);
#define git_SHA_CTX blk_SHA_CTX
#define git_SHA1_Init blk_SHA1_Init
-#define git_SHA1_Update blk_SHA1_Update
+#define platform_SHA1_Update blk_SHA1_Update
#define git_SHA1_Final blk_SHA1_Final
diff --git a/cache.h b/cache.h
index 79066e5..e345e38 100644
--- a/cache.h
+++ b/cache.h
@@ -10,12 +10,21 @@
#include "trace.h"
#include "string-list.h"
+/* platform's underlying implementation of SHA1 */
#include SHA1_HEADER
#ifndef git_SHA_CTX
-#define git_SHA_CTX SHA_CTX
-#define git_SHA1_Init SHA1_Init
-#define git_SHA1_Update SHA1_Update
-#define git_SHA1_Final SHA1_Final
+#define git_SHA_CTX SHA_CTX
+#define git_SHA1_Init SHA1_Init
+#define platform_SHA1_Update SHA1_Update
+#define git_SHA1_Final SHA1_Final
+#endif
+
+/* choose chunked implementation or not */
+#ifdef SHA1_MAX_BLOCK_SIZE
+int git_SHA1_Update_Chunked(SHA_CTX *c, const void *data, size_t len);
+#define git_SHA1_Update git_SHA1_Update_Chunked
+#else
+#define git_SHA1_Update platform_SHA1_Update
#endif
#include <zlib.h>
diff --git a/compat/apple-common-crypto.h b/compat/apple-common-crypto.h
index c8b9b0e..d3fb264 100644
--- a/compat/apple-common-crypto.h
+++ b/compat/apple-common-crypto.h
@@ -16,6 +16,10 @@
#undef TYPE_BOOL
#endif
+#ifndef SHA1_MAX_BLOCK_SIZE
+#error Using Apple Common Crypto library requires setting SHA1_MAX_BLOCK_SIZE
+#endif
+
#ifdef APPLE_LION_OR_NEWER
#define git_CC_error_check(pattern, err) \
do { \
diff --git a/compat/sha1_chunked.c b/compat/sha1_chunked.c
new file mode 100644
index 0000000..6d0062b
--- /dev/null
+++ b/compat/sha1_chunked.c
@@ -0,0 +1,19 @@
+#include "cache.h"
+
+int git_SHA1_Update_Chunked(SHA_CTX *c, const void *data, size_t len)
+{
+ size_t nr;
+ size_t total = 0;
+ const char *cdata = (const char*)data;
+
+ while (len) {
+ nr = len;
+ if (nr > SHA1_MAX_BLOCK_SIZE)
+ nr = SHA1_MAX_BLOCK_SIZE;
+ platform_SHA1_Update(c, cdata, nr);
+ total += nr;
+ cdata += nr;
+ len -= nr;
+ }
+ return total;
+}
--
2.4.9 (Apple Git-60)
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