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LEARN ABOUT LINUX

ssl_ctx_set_psk_client_callback

SSL_CTX_set_psk_client_callback(3SSL)				      OpenSSL				     SSL_CTX_set_psk_client_callback(3SSL)

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 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.

1.0.0e								    2006-03-10				     SSL_CTX_set_psk_client_callback(3SSL)

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