utils/tomcrypt/src/misc/crypt/crypt_register_cipher.c at master · tsiry-sandratraina.com/rockbox-zig

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rockbox-zig / utils / tomcrypt / src / misc / crypt / crypt_register_cipher.c

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 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_cipher.c
13  Register a cipher, Tom St Denis
14*/
15
16/**
17   Register a cipher with the descriptor table
18   @param cipher   The cipher you wish to register
19   @return value >= 0 if successfully added (or already present), -1 if unsuccessful
20*/
21int register_cipher(const struct ltc_cipher_descriptor *cipher)
22{
23   int x;
24
25   LTC_ARGCHK(cipher != NULL);
26
27   /* is it already registered? */
28   LTC_MUTEX_LOCK(&ltc_cipher_mutex);
29   for (x = 0; x < TAB_SIZE; x++) {
30       if (cipher_descriptor[x].name != NULL && cipher_descriptor[x].ID == cipher->ID) {
31          LTC_MUTEX_UNLOCK(&ltc_cipher_mutex);
32          return x;
33       }
34   }
35
36   /* find a blank spot */
37   for (x = 0; x < TAB_SIZE; x++) {
38       if (cipher_descriptor[x].name == NULL) {
39          XMEMCPY(&cipher_descriptor[x], cipher, sizeof(struct ltc_cipher_descriptor));
40          LTC_MUTEX_UNLOCK(&ltc_cipher_mutex);
41          return x;
42       }
43   }
44
45   /* no spot */
46   LTC_MUTEX_UNLOCK(&ltc_cipher_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 */