ecryptfs_add_new_key_tfm
rc = ecryptfs_add_new_key_tfm(&key_tfm, cipher_name, 0);
ecryptfs_add_new_key_tfm(struct ecryptfs_key_tfm **key_tfm, char *cipher_name,
rc = ecryptfs_add_new_key_tfm(
rc = ecryptfs_add_new_key_tfm(