csum += checksum (buffer, ndata);
gcry_mpi_release (sk->skey[i]);
if (sk->protect.algo==CIPHER_ALGO_IDEA) {
buffer[0] = 0;
buffer[1] = 0;
}
err = gcry_mpi_scan( &sk->skey[i], GCRYMPI_FMT_USG,
buffer, ndata, &ndata );
xfree (buffer);