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size_t secret_size, new_secret_size;
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if (secret_size > SIZE_MAX/2) {
   /* handle error condition */
}

temp_buff = calloc(secret_size * 2, sizeof(char)); /* calloc() initializes memory to zero */
if (temp_buff == NULL) {
 /* Handle Error */
}

memcpy(temp_buff, secret, secret_size);
memset(secret, '\0', secret_size);         /* sanitize the buffer */

free(secret);
secret = temp_buff;                      /* install the resized buffer */
temp_buff = NULL;
...