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sha1-file: add a constant for hash block size 

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
View File

@ -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];

3
hash.h
View File

@ -81,6 +81,9 @@ struct git_hash_algo {
/* The length of the hash in hex characters. */
size_t hexsz;
/* The block size of the hash. */
size_t blksz;
/* The hash initialization function. */
git_hash_init_fn init_fn;

2
sha1-file.c
View File

@ -90,6 +90,7 @@ const struct git_hash_algo hash_algos[GIT_HASH_NALGOS] = {
0x00000000,
0,
0,
0,
git_hash_unknown_init,
git_hash_unknown_update,
git_hash_unknown_final,
@ -102,6 +103,7 @@ const struct git_hash_algo hash_algos[GIT_HASH_NALGOS] = {
0x73686131,
GIT_SHA1_RAWSZ,
GIT_SHA1_HEXSZ,
GIT_SHA1_BLKSZ,
git_hash_sha1_init,
git_hash_sha1_update,
git_hash_sha1_final,