8 int read_secret_from_file(const char *filename, char *secret, size_t max_len);
11 * Attempts to add the secret to the kernel, but falls back to
12 * the old secret= option if the kernel is too old.
14 int get_secret_option(const char *secret, const char *key_name,
15 char *secret_option, size_t secret_option_len);
17 int set_kernel_secret(const char *secret, const char *key_name);
19 int is_kernel_secret(const char *key_name);