43 lines
1.1 KiB
C
43 lines
1.1 KiB
C
/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
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/* SPDX-License-Identifier: Unlicense */
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#include "tomcrypt_private.h"
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/**
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@file crypt_register_cipher.c
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Register a cipher, Tom St Denis
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*/
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/**
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Register a cipher with the descriptor table
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@param cipher The cipher you wish to register
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@return value >= 0 if successfully added (or already present), -1 if unsuccessful
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*/
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int register_cipher(const struct ltc_cipher_descriptor *cipher)
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{
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int x;
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LTC_ARGCHK(cipher != NULL);
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/* is it already registered? */
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LTC_MUTEX_LOCK(<c_cipher_mutex);
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for (x = 0; x < TAB_SIZE; x++) {
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if (cipher_descriptor[x].name != NULL && cipher_descriptor[x].ID == cipher->ID) {
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LTC_MUTEX_UNLOCK(<c_cipher_mutex);
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return x;
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}
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}
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/* find a blank spot */
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for (x = 0; x < TAB_SIZE; x++) {
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if (cipher_descriptor[x].name == NULL) {
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XMEMCPY(&cipher_descriptor[x], cipher, sizeof(struct ltc_cipher_descriptor));
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LTC_MUTEX_UNLOCK(<c_cipher_mutex);
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return x;
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}
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}
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/* no spot */
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LTC_MUTEX_UNLOCK(<c_cipher_mutex);
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return -1;
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}
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