const char * trustanchor)
Passes arbitrary trust anchor configuration information to the resolver.
||dkim_dns_trustanchor() can be called at any time, but is
presumably most useful prior to doing any DNS operations such as are done
during dkim_eoh() when verifying.
||The library instantiation handle, returned by
||A null-terminated string containing trust anchor configuration
data for the resolver. The string is passed intact to the resolver
and is not used by this library.
- DKIM_DNS_SUCCESS -- successful operation (the underlying
trust anchor configuration function returned something other than zero)
- DKIM_DNS_ERROR -- an error occurred