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Add new optimized C 'block-sha1' routines

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Based on the mozilla SHA1 routine, but doing the input data accesses a
word at a time and with 'htonl()' instead of loading bytes and shifting.

It requires an architecture that is ok with unaligned 32-bit loads and a
fast htonl().

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Linus Torvalds
2009-08-05 16:13:20 -07:00
committed by Junio C Hamano
parent 3f55e4107f
commit d7c208a92e
3 changed files with 175 additions and 0 deletions
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21
block-sha1/sha1.h Normal file
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/*
* Based on the Mozilla SHA1 (see mozilla-sha1/sha1.h),
* optimized to do word accesses rather than byte accesses,
* and to avoid unnecessary copies into the context array.
*/
typedef struct {
unsigned int H[5];
unsigned int W[16];
int lenW;
unsigned long long size;
} blk_SHA_CTX;
void blk_SHA1_Init(blk_SHA_CTX *ctx);
void blk_SHA1_Update(blk_SHA_CTX *ctx, const void *dataIn, unsigned long len);
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 git_SHA1_Final blk_SHA1_Final