SSL_set_psk_client_callback (3)
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NAME
SSL_CTX_set_psk_client_callback, SSL_set_psk_client_callback - set PSK client callbackSYNOPSIS
#include <openssl/ssl.h> void SSL_CTX_set_psk_client_callback(SSL_CTX *ctx, unsigned int (*callback)(SSL *ssl, const char *hint, char *identity, unsigned int max_identity_len, unsigned char *psk, unsigned int max_psk_len)); void SSL_set_psk_client_callback(SSL *ssl, unsigned int (*callback)(SSL *ssl, const char *hint, char *identity, unsigned int max_identity_len, unsigned char *psk, unsigned int max_psk_len));
DESCRIPTION
A client application must provide a callback function which is called when the client is sending the ClientKeyExchange message to the server.The purpose of the callback function is to select the
PSK
identity and
the pre-shared key to use during the connection setup phase.
The callback is set using functions SSL_CTX_set_psk_client_callback() or SSL_set_psk_client_callback(). The callback function is given the connection in parameter ssl, a
NULL
-terminated PSK
identity hint
sent by the server in parameter hint, a buffer identity of
length max_identity_len bytes where the the resulting
NULL
-terminated identity is to be stored, and a buffer psk of
length max_psk_len bytes where the resulting pre-shared key is to
be stored.
NOTES
Note that parameter hint given to the callback may beNULL
.
RETURN VALUES
Return values from the client callback are interpreted as follows:On success (callback found a
PSK
identity and a pre-shared key to use)
the length (> 0) of psk in bytes is returned.
Otherwise or on errors callback should return 0. In this case the connection setup fails.