1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
2  *
3  * LibTomCrypt is a library that provides various cryptographic
4  * algorithms in a highly modular and flexible manner.
5  *
6  * The library is free for all purposes without any express
7  * guarantee it works.
8  */
9 #include "tomcrypt.h"
10 
11 /**
12   @file crypt_register_hash.c
13   Register a HASH, Tom St Denis
14 */
15 
16 /**
17    Register a hash with the descriptor table
18    @param hash   The hash you wish to register
19    @return value >= 0 if successfully added (or already present), -1 if unsuccessful
20 */
register_hash(const struct ltc_hash_descriptor * hash)21 int register_hash(const struct ltc_hash_descriptor *hash)
22 {
23    int x;
24 
25    LTC_ARGCHK(hash != NULL);
26 
27    /* is it already registered? */
28    LTC_MUTEX_LOCK(&ltc_hash_mutex);
29    for (x = 0; x < TAB_SIZE; x++) {
30        if (XMEMCMP(&hash_descriptor[x], hash, sizeof(struct ltc_hash_descriptor)) == 0) {
31           LTC_MUTEX_UNLOCK(&ltc_hash_mutex);
32           return x;
33        }
34    }
35 
36    /* find a blank spot */
37    for (x = 0; x < TAB_SIZE; x++) {
38        if (hash_descriptor[x].name == NULL) {
39           XMEMCPY(&hash_descriptor[x], hash, sizeof(struct ltc_hash_descriptor));
40           LTC_MUTEX_UNLOCK(&ltc_hash_mutex);
41           return x;
42        }
43    }
44 
45    /* no spot */
46    LTC_MUTEX_UNLOCK(&ltc_hash_mutex);
47    return -1;
48 }
49 
50 /* ref:         HEAD -> master, tag: v1.18.2 */
51 /* git commit:  7e7eb695d581782f04b24dc444cbfde86af59853 */
52 /* commit time: 2018-07-01 22:49:01 +0200 */
53