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 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 be NULL.
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.
