=pod

=head1 NAME

SSL_load_client_CA_file - load certificate names from file

=head1 SYNOPSIS

 #include <openssl/ssl.h>

 STACK_OF(X509_NAME) *SSL_load_client_CA_file(const char *file);

=head1 DESCRIPTION

SSL_load_client_CA_file() reads certificates from B<file> and returns
a STACK_OF(X509_NAME) with the subject names found.

=head1 NOTES

SSL_load_client_CA_file() reads a file of PEM formatted certificates and
extracts the X509_NAMES of the certificates found. While the name suggests
the specific usage as support function for
L<SSL_CTX_set_client_CA_list(3)|SSL_CTX_set_client_CA_list(3)>,
it is not limited to CA certificates.

=head1 EXAMPLES

Load names of CAs from file and use it as a client CA list:

 SSL_CTX *ctx;
 STACK_OF(X509_NAME) *cert_names;

 ... 
 cert_names = SSL_load_client_CA_file("/path/to/CAfile.pem");
 if (cert_names != NULL)
   SSL_CTX_set_client_CA_list(ctx, cert_names);
 else
   error_handling();
 ...

=head1 RETURN VALUES

The following return values can occur:

=over 4

=item NULL

The operation failed, check out the error stack for the reason.

=item Pointer to STACK_OF(X509_NAME)

Pointer to the subject names of the successfully read certificates.

=back

=head1 SEE ALSO

L<ssl(3)|ssl(3)>,
L<SSL_CTX_set_client_CA_list(3)|SSL_CTX_set_client_CA_list(3)>

=cut