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131 .IX Title "SSL_CTX_set_psk_client_callback 3"
132 .TH SSL_CTX_set_psk_client_callback 3 "2017-01-26" "1.0.2k" "OpenSSL"
133 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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138 SSL_CTX_set_psk_client_callback, SSL_set_psk_client_callback \- set PSK client callback
140 .IX Header "SYNOPSIS"
142 \& #include <openssl/ssl.h>
144 \& void SSL_CTX_set_psk_client_callback(SSL_CTX *ctx,
145 \& unsigned int (*callback)(SSL *ssl, const char *hint,
146 \& char *identity, unsigned int max_identity_len,
147 \& unsigned char *psk, unsigned int max_psk_len));
148 \& void SSL_set_psk_client_callback(SSL *ssl,
149 \& unsigned int (*callback)(SSL *ssl, const char *hint,
150 \& char *identity, unsigned int max_identity_len,
151 \& unsigned char *psk, unsigned int max_psk_len));
154 .IX Header "DESCRIPTION"
155 A client application must provide a callback function which is called
156 when the client is sending the ClientKeyExchange message to the server.
158 The purpose of the callback function is to select the \s-1PSK\s0 identity and
159 the pre-shared key to use during the connection setup phase.
161 The callback is set using functions \fISSL_CTX_set_psk_client_callback()\fR
162 or \fISSL_set_psk_client_callback()\fR. The callback function is given the
163 connection in parameter \fBssl\fR, a \fB\s-1NULL\s0\fR\-terminated \s-1PSK\s0 identity hint
164 sent by the server in parameter \fBhint\fR, a buffer \fBidentity\fR of
165 length \fBmax_identity_len\fR bytes where the resulting
166 \&\fB\s-1NULL\s0\fR\-terminated identity is to be stored, and a buffer \fBpsk\fR of
167 length \fBmax_psk_len\fR bytes where the resulting pre-shared key is to
171 Note that parameter \fBhint\fR given to the callback may be \fB\s-1NULL\s0\fR.
173 .IX Header "RETURN VALUES"
174 Return values from the client callback are interpreted as follows:
176 On success (callback found a \s-1PSK\s0 identity and a pre-shared key to use)
177 the length (> 0) of \fBpsk\fR in bytes is returned.
179 Otherwise or on errors callback should return 0. In this case
180 the connection setup fails.