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sha1-file: add a constant for hash block size

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There is one place we need the hash algorithm block size: the HMAC code
for push certs.  Expose this constant in struct git_hash_algo and expose
values for SHA-1 and for the largest value of any hash.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
brian m. carlson
2018-11-14 04:09:33 +00:00
committed by Junio C Hamano
parent 50c817e0c0
commit a2ce0a7526
3 changed files with 9 additions and 0 deletions
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4
cache.h
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@ -45,10 +45,14 @@ unsigned long git_deflate_bound(git_zstream *, unsigned long);
/* The length in bytes and in hex digits of an object name (SHA-1 value). */
#define GIT_SHA1_RAWSZ 20
#define GIT_SHA1_HEXSZ (2 * GIT_SHA1_RAWSZ)
/* The block size of SHA-1. */
#define GIT_SHA1_BLKSZ 64
/* The length in byte and in hex digits of the largest possible hash value. */
#define GIT_MAX_RAWSZ GIT_SHA1_RAWSZ
#define GIT_MAX_HEXSZ GIT_SHA1_HEXSZ
/* The largest possible block size for any supported hash. */
#define GIT_MAX_BLKSZ GIT_SHA1_BLKSZ
struct object_id {
unsigned char hash[GIT_MAX_RAWSZ];