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SSL_CTX_use_psk_identity_hint.3
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If \fBhint\fR is \fB\s-1NULL\s0\fR the current hint from \fBctx\fR or \fBssl\fR is deleted. .PP In the case where \s-1PSK\s0 identity hint is \fB\s-1NULL\s0\fR, the server does not send the ServerKeyExchange message to the client. .PP A server application must provide a callback function which is called when the server receives the ClientKeyExchange message from the client. The purpose of the callback function is to validate the received \s-1PSK\s0 identity and to fetch the pre-shared key used during the connection setup phase. The callback is set using functions \&\fISSL_CTX_set_psk_server_callback()\fR or \&\fISSL_set_psk_server_callback()\fR. The callback function is given the connection in parameter \fBssl\fR, \fB\s-1NULL\s0\fR\-terminated \s-1PSK\s0 identity sent by the client in parameter \fBidentity\fR, and a buffer \fBpsk\fR of length \&\fBmax_psk_len\fR bytes where the pre-shared key is to be stored. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fISSL_CTX_use_psk_identity_hint()\fR and \fISSL_use_psk_identity_hint()\fR return 1 on success, 0 otherwise. .PP Return values from the server callback are interpreted as follows: .IP "\&0" 4 .IX Item "0" \&\s-1PSK\s0 identity was not found. An \*(L"unknown_psk_identity\*(R" alert message will be sent and the connection setup fails. .IP ">0" 4 .IX Item ">0" \&\s-1PSK\s0 identity was found and the server callback has provided the \s-1PSK\s0 successfully in parameter \fBpsk\fR. Return value is the length of \&\fBpsk\fR in bytes. It is an error to return a value greater than \&\fBmax_psk_len\fR. .Sp If the \s-1PSK\s0 identity was not found but the callback instructs the protocol to continue anyway, the callback must provide some random data to \fBpsk\fR and return the length of the random data, so the connection will fail with decryption_error before it will be finished completely.