| /* 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. |
| * |
| * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org |
| */ |
| #include "tomcrypt.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? */ |
| for (x = 0; x < TAB_SIZE; x++) { |
| if (memcmp(&prng_descriptor[x], prng, sizeof(struct ltc_prng_descriptor)) == 0) { |
| return x; |
| } |
| } |
| |
| /* find a blank spot */ |
| for (x = 0; x < TAB_SIZE; x++) { |
| if (prng_descriptor[x].name == NULL) { |
| XMEMCPY(&prng_descriptor[x], prng, sizeof(struct ltc_prng_descriptor)); |
| return x; |
| } |
| } |
| |
| /* no spot */ |
| return -1; |
| } |