1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis */
2 /* SPDX-License-Identifier: Unlicense */
3 #include "tomcrypt_private.h"
4 
5 /**
6   @file crypt_unregister_prng.c
7   Unregister a PRNG, Tom St Denis
8 */
9 
10 /**
11   Unregister a PRNG from the descriptor table
12   @param prng   The PRNG descriptor to remove
13   @return CRYPT_OK on success
14 */
unregister_prng(const struct ltc_prng_descriptor * prng)15 int unregister_prng(const struct ltc_prng_descriptor *prng)
16 {
17    int x;
18 
19    LTC_ARGCHK(prng != NULL);
20 
21    /* is it already registered? */
22    LTC_MUTEX_LOCK(&ltc_prng_mutex);
23    for (x = 0; x < TAB_SIZE; x++) {
24        if (prng_descriptor[x] == prng) {
25           prng_descriptor[x] = NULL;
26           LTC_MUTEX_UNLOCK(&ltc_prng_mutex);
27           return CRYPT_OK;
28        }
29    }
30    LTC_MUTEX_UNLOCK(&ltc_prng_mutex);
31    return CRYPT_ERROR;
32 }
33