Document X509 name get and set functions.

Reviewed-by: NMatt Caswell <matt@openssl.org>

doc/crypto/X509_get_subject_name.pod

+=pod
+
+=head1 NAME
+
+X509_get_subject_name, X509_set_subject_name, X509_get_issuer_name,
+X509_set_issuer_name, X509_REQ_get_subject_name, X509_REQ_set_subject_name,
+X509_CRL_get_issuer, X509_CRL_set_issuer_name - get and set issuer or
+subject names.
+
+=head1 SYNOPSIS
+
+ #include <openssl/x509.h>
+
+ X509_NAME *X509_get_subject_name(X509 *x);
+ int X509_set_subject_name(X509 *x, X509_NAME *name);
+
+ X509_NAME *X509_get_issuer_name(X509 *x);
+ int X509_set_issuer_name(X509 *x, X509_NAME *name);
+
+ X509_NAME *X509_REQ_get_subject_name(X509_REQ *req);
+ int X509_REQ_set_subject_name(X509_REQ *req, X509_NAME *name);
+
+ X509_NAME *X509_CRL_get_issuer(X509_CRL *crl);
+ int X509_CRL_set_issuer_name(X509_CRL *x, X509_NAME *name);
+
+=head1 DESCRIPTION
+
+X509_get_subject_name() returns the subject name of certificate B<x>. The
+returned value is an internal pointer which B<MUST NOT> be freed.
+
+X509_set_subject_name() sets the issuer name of certificate B<x> to
+B<name>. The B<name> parameter is copied internally and should be freed
+up when it is no longer needed.
+
+X509_get_issuer_name() and X509_set_issuer_name() are identical to
+X509_get_subject_name() and X509_set_subject_name() except the get and
+set the isssuer name of B<x>.
+
+Similarly X509_REQ_get_subject_name(), X509_REQ_set_subject_name(),
+ X509_CRL_get_issuer() and X509_CRL_set_issuer_name() get or set the subject
+or issuer names of certifcate requests of CRLs respectively.
+
+=head1 RETURN VALUES
+
+X509_get_subject_name(), X509_get_issuer_name(), X509_REQ_get_subject_name()
+and X509_CRL_get_issuer() return an B<X509_NAME> pointer.
+
+X509_set_subject_name(), X509_set_issuer_name(), X509_REQ_set_subject_name()
+and X509_CRL_set_issuer_name() return 1 for success and 0 for failure.
+
+=head1 HISTORY
+
+X509_get_subject_name(), X509_set_subject_name() and X509_get_issuer_name(),
+X509_set_issuer_name(), X509_REQ_set_subject_name() and
+X509_CRL_set_issuer_name() are avaiable in all versions of OpenSSL.
+
+X509_REQ_get_subject_name() is a function in OpenSSL 1.1.0 and a macro in
+earlier versions.
+
+X509_CRL_get_issuer() is a function in OpenSSL 1.1.0. It was first added
+to OpenSSL 1.0.0 as a macro.
+
+=head1 SEE ALSO
+
+L<d2i_X509(3)>,
+L<ERR_get_error(3)>, L<d2i_X509(3)>
+L<X509_CRL_get0_by_serial(3)>,
+L<X509_get0_signature(3)>,
+L<X509_get_ext_d2i(3)>,
+L<X509_get_extension_flags(3)>,
+L<X509_get_pubkey(3)>,
+L<X509_NAME_add_entry_by_txt(3)>,
+L<X509_NAME_ENTRY_get_object(3)>,
+L<X509_NAME_get_index_by_NID(3)>,
+L<X509_NAME_print_ex(3)>,
+L<X509_new(3)>,
+L<X509_sign(3)>,
+L<X509V3_get_d2i(3)>,
+L<X509_verify_cert(3)>
+
+=cut