status-go/vendor/github.com/mutecomm/go-sqlcipher/v4/crypt_register_cipher.c

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