1SSL_CTX_set_psk_client_callback(3) OpenSSL SSL_CTX_set_psk_client_callback(3)
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6 SSL_CTX_set_psk_client_callback, SSL_set_psk_client_callback - set PSK
7 client callback
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10 #include <openssl/ssl.h>
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12 void SSL_CTX_set_psk_client_callback(SSL_CTX *ctx,
13 unsigned int (*callback)(SSL *ssl, const char *hint,
14 char *identity, unsigned int max_identity_len,
15 unsigned char *psk, unsigned int max_psk_len));
16 void SSL_set_psk_client_callback(SSL *ssl,
17 unsigned int (*callback)(SSL *ssl, const char *hint,
18 char *identity, unsigned int max_identity_len,
19 unsigned char *psk, unsigned int max_psk_len));
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22 A client application must provide a callback function which is called
23 when the client is sending the ClientKeyExchange message to the server.
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25 The purpose of the callback function is to select the PSK identity and
26 the pre-shared key to use during the connection setup phase.
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28 The callback is set using functions SSL_CTX_set_psk_client_callback()
29 or SSL_set_psk_client_callback(). The callback function is given the
30 connection in parameter ssl, a NULL-terminated PSK identity hint sent
31 by the server in parameter hint, a buffer identity of length
32 max_identity_len bytes where the the resulting NULL-terminated identity
33 is to be stored, and a buffer psk of length max_psk_len bytes where the
34 resulting pre-shared key is to be stored.
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37 Note that parameter hint given to the callback may be NULL.
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40 Return values from the client callback are interpreted as follows:
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42 On success (callback found a PSK identity and a pre-shared key to use)
43 the length (> 0) of psk in bytes is returned.
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45 Otherwise or on errors callback should return 0. In this case the
46 connection setup fails.
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501.0.2o 2018-03-27SSL_CTX_set_psk_client_callback(3)