This function can be used to set a callback to retrieve the
user's PSK credentials. The callback's function form is: int
(*callback)(gnutls_session_t, const char* username,
username contains the actual username. The key must be filled
in using the gnutls_malloc().
In case the callback returned a negative number then gnutls will
assume that the username does not exist.
The callback function will only be called once per handshake.
The callback function should return 0 on success, while -1
indicates an error.
This page is part of the GnuTLS (GnuTLS Transport Layer Security
Library) project. Information about the project can be found at
⟨http://www.gnutls.org/⟩. If you have a bug report for this
manual page, send it to email@example.com. This page was obtained
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⟨http://www.gnutls.org/download.html⟩ on 2021-08-27. If you
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