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@deftypefun {int} {gnutls_psk_set_client_credentials} (gnutls_psk_client_credentials_t @var{res}, const char * @var{username}, const gnutls_datum_t * @var{key}, gnutls_psk_key_flags @var{flags})
@var{res}: is a @code{gnutls_psk_client_credentials_t} structure.
@var{username}: is the user's zero-terminated userid
@var{key}: is the user's key
@var{flags}: indicate the format of the key, either
@code{GNUTLS_PSK_KEY_RAW} or @code{GNUTLS_PSK_KEY_HEX} .
This function sets the username and password, in a
gnutls_psk_client_credentials_t structure. Those will be used in
PSK authentication. @code{username} should be an ASCII string or UTF-8
strings prepared using the "SASLprep" profile of "stringprep". The
key can be either in raw byte format or in Hex format (without the
0x prefix).
@strong{Returns:} On success, @code{GNUTLS_E_SUCCESS} (0) is returned, otherwise
an error code is returned.
@end deftypefun
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