pub unsafe extern "C" fn sc_get_transform_type(
hashtype: *mut oid,
hashtype_len: c_uint,
hash_fn: *mut Option<unsafe extern "C" fn(mode: c_int, context: *mut *mut c_void, data: *const c_uchar, data_len: c_int, digest: *mut *mut c_uchar, digest_len: *mut size_t) -> c_int>,
) -> c_int