SSL_CTX_set_psk_client_callback (3)

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NAME

SSL_CTX_set_psk_client_callback, SSL_set_psk_client_callback - set PSK client callback

SYNOPSIS

 #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

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

-terminated identity hint sent by the server in parameter hint, a buffer identity of length max_identity_len bytes where the the resulting -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 be .

RETURN VALUES

Return values from the client callback are interpreted as follows:

On success (callback found a

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.