keynote_get_key_algorithm
extern int keynote_get_key_algorithm(char *, int *, int *);
alg = keynote_get_key_algorithm(algname, &enc, &ienc);
return keynote_get_key_algorithm(key + KEYNOTE_PRIVATE_KEY_PREFIX_LEN,
dc->dec_algorithm = keynote_get_key_algorithm(key, &encoding,