This should only be called in case of PSK authentication and in
case of a server.
The returned pointer should be considered constant (do not free)
and valid for the lifetime of the session.
This function will return NULL if the username has embedded NULL
bytes. In that case, gnutls_psk_server_get_username2() should be
used to retrieve the username.
This page is part of the GnuTLS (GnuTLS Transport Layer Security
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⟨http://www.gnutls.org/⟩. If you have a bug report for this
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