1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis */ 2 /* SPDX-License-Identifier: Unlicense */ 3 #include "tomcrypt_private.h" 4 5 /** 6 @file crypt_register_hash.c 7 Register a HASH, Tom St Denis 8 */ 9 10 /** 11 Register a hash with the descriptor table 12 @param hash The hash you wish to register 13 @return value >= 0 if successfully added (or already present), -1 if unsuccessful 14 */ register_hash(const struct ltc_hash_descriptor * hash)15int register_hash(const struct ltc_hash_descriptor *hash) 16 { 17 int x; 18 19 LTC_ARGCHK(hash != NULL); 20 21 /* is it already registered? */ 22 LTC_MUTEX_LOCK(<c_hash_mutex); 23 for (x = 0; x < TAB_SIZE; x++) { 24 if (XMEMCMP(&hash_descriptor[x], hash, sizeof(struct ltc_hash_descriptor)) == 0) { 25 LTC_MUTEX_UNLOCK(<c_hash_mutex); 26 return x; 27 } 28 } 29 30 /* find a blank spot */ 31 for (x = 0; x < TAB_SIZE; x++) { 32 if (hash_descriptor[x].name == NULL) { 33 XMEMCPY(&hash_descriptor[x], hash, sizeof(struct ltc_hash_descriptor)); 34 LTC_MUTEX_UNLOCK(<c_hash_mutex); 35 return x; 36 } 37 } 38 39 /* no spot */ 40 LTC_MUTEX_UNLOCK(<c_hash_mutex); 41 return -1; 42 } 43