| // SPDX-License-Identifier: BSD-2-Clause |
| /* LibTomCrypt, modular cryptographic library -- Tom St Denis |
| * |
| * LibTomCrypt is a library that provides various cryptographic |
| * algorithms in a highly modular and flexible manner. |
| * |
| * The library is free for all purposes without any express |
| * guarantee it works. |
| */ |
| #include "tomcrypt_private.h" |
| |
| /** |
| @file crypt_register_prng.c |
| Register a PRNG, Tom St Denis |
| */ |
| |
| /** |
| Register a PRNG with the descriptor table |
| @param prng The PRNG you wish to register |
| @return value >= 0 if successfully added (or already present), -1 if unsuccessful |
| */ |
| int register_prng(const struct ltc_prng_descriptor *prng) |
| { |
| int x; |
| |
| LTC_ARGCHK(prng != NULL); |
| |
| /* is it already registered? */ |
| LTC_MUTEX_LOCK(<c_prng_mutex); |
| for (x = 0; x < TAB_SIZE; x++) { |
| if (prng_descriptor[x] == prng) { |
| LTC_MUTEX_UNLOCK(<c_prng_mutex); |
| return x; |
| } |
| } |
| |
| /* find a blank spot */ |
| for (x = 0; x < TAB_SIZE; x++) { |
| if (prng_descriptor[x] == NULL) { |
| prng_descriptor[x] = prng; |
| LTC_MUTEX_UNLOCK(<c_prng_mutex); |
| return x; |
| } |
| } |
| |
| /* no spot */ |
| LTC_MUTEX_UNLOCK(<c_prng_mutex); |
| return -1; |
| } |
| |
| /* ref: $Format:%D$ */ |
| /* git commit: $Format:%H$ */ |
| /* commit time: $Format:%ai$ */ |