krb5_k_make_checksum_iov
ret = krb5_k_make_checksum_iov(context, cksumtype, key, usage,
code = krb5_k_make_checksum_iov(context, type, seq, sign_usage, kiov, i);
code = krb5_k_make_checksum_iov(context, type, key, sign_usage, kiov, kiov_count);
ret = krb5_k_make_checksum_iov(context, type, key, usage, iov, 3);
*minor = krb5_k_make_checksum_iov(NULL, CKSUMTYPE_SHA1, NULL, 0, iov, 3);