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 * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.com 10 */ 11 #include "tomcrypt.h" 12 13 /** 14 @file crypt_register_cipher.c 15 Register a cipher, Tom St Denis 16 */ 17 18 /** 19 Register a cipher with the descriptor table 20 @param cipher The cipher you wish to register 21 @return value >= 0 if successfully added (or already present), -1 if unsuccessful 22 */ register_cipher(const struct ltc_cipher_descriptor * cipher)23int register_cipher(const struct ltc_cipher_descriptor *cipher) 24 { 25 int x; 26 27 LTC_ARGCHK(cipher != NULL); 28 29 /* is it already registered? */ 30 LTC_MUTEX_LOCK(<c_cipher_mutex); 31 for (x = 0; x < TAB_SIZE; x++) { 32 if (cipher_descriptor[x].name != NULL && cipher_descriptor[x].ID == cipher->ID) { 33 LTC_MUTEX_UNLOCK(<c_cipher_mutex); 34 return x; 35 } 36 } 37 38 /* find a blank spot */ 39 for (x = 0; x < TAB_SIZE; x++) { 40 if (cipher_descriptor[x].name == NULL) { 41 XMEMCPY(&cipher_descriptor[x], cipher, sizeof(struct ltc_cipher_descriptor)); 42 LTC_MUTEX_UNLOCK(<c_cipher_mutex); 43 return x; 44 } 45 } 46 47 /* no spot */ 48 LTC_MUTEX_UNLOCK(<c_cipher_mutex); 49 return -1; 50 } 51 52 /* $Source: /cvs/libtom/libtomcrypt/src/misc/crypt/crypt_register_cipher.c,v $ */ 53 /* $Revision: 1.5 $ */ 54 /* $Date: 2006/03/31 14:15:35 $ */ 55