start_stream
start_stream(f, CRYPT_ENCRYPT);
start_stream(f, CRYPT_DECRYPT);
start_stream(cryptmod_fd, CRYPT_ENCRYPT, 0, NULL);
start_stream(cryptmod_fd, stopdir, 0, NULL);
start_stream(cryptmod_fd, CRYPT_DECRYPT, bytes, dataptr);
start_stream(wq, mp, CRYPT_DECRYPT);
start_stream(wq, mp, CRYPT_ENCRYPT);