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sha1: allow limiting the size of the data passed to SHA1_Update()

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Using the previous commit's inredirection mechanism for SHA1,
support a chunked implementation of SHA1_Update() that limits the
amount of data in the chunk passed to SHA1_Update().

This is enabled by using the Makefile variable SHA1_MAX_BLOCK_SIZE
to specify chunk size.  When using Apple's CommonCrypto library this
is set to 1GiB (the implementation cannot handle more 4GiB).

Signed-off-by: Atousa Pahlevan Duprat <apahlevan@ieee.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Atousa Pahlevan Duprat 2015-11-04 22:38:42 -08:00 committed by Junio C Hamano
parent 3bc72fde3f
commit 001fd7a90b
5 changed files with 44 additions and 0 deletions
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13
Makefile
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@ -141,6 +141,10 @@ all::
# Define PPC_SHA1 environment variable when running make to make use of
# a bundled SHA1 routine optimized for PowerPC.
#
# Define SHA1_MAX_BLOCK_SIZE to limit the amount of data that will be hashed
# in one call to the platform's SHA1_Update(). e.g. APPLE_COMMON_CRYPTO
# wants '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).
@ -1276,6 +1280,11 @@ ifdef NO_POSIX_GOODIES
BASIC_CFLAGS += -DNO_POSIX_GOODIES
endif
ifdef APPLE_COMMON_CRYPTO
# Apple CommonCrypto requires chunking
SHA1_MAX_BLOCK_SIZE = 1024L*1024L*1024L
endif
ifdef BLK_SHA1
SHA1_HEADER = "block-sha1/sha1.h"
LIB_OBJS += block-sha1/sha1.o
@ -1294,6 +1303,10 @@ 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

6
cache.h
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@ -30,6 +30,12 @@
#define git_SHA1_Update platform_SHA1_Update
#define git_SHA1_Final platform_SHA1_Final
#ifdef SHA1_MAX_BLOCK_SIZE
#include "compat/sha1-chunked.h"
#undef git_SHA1_Update
#define git_SHA1_Update git_SHA1_Update_Chunked
#endif
#include <zlib.h>
typedef struct git_zstream {
z_stream z;

4
compat/apple-common-crypto.h
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@ -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 { \

19
compat/sha1-chunked.c Normal file
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@ -0,0 +1,19 @@
#include "cache.h"
int git_SHA1_Update_Chunked(platform_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
compat/sha1-chunked.h Normal file
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@ -0,0 +1,2 @@
int git_SHA1_Update_Chunked(platform_SHA_CTX *c, const void *data, size_t len);