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SSL_get_client_random.pod
=pod =head1 NAME SSL_get_client_random, SSL_get_server_random, SSL_SESSION_get_master_key, SSL_SESSION_set1_master_key - get internal TLS/SSL random values and get/set master key =head1 SYNOPSIS #include <openssl/ssl.h> size_t SSL_get_client_random(const SSL *ssl, unsigned char *out, size_t outlen); size_t SSL_get_server_random(const SSL *ssl, unsigned char *out, size_t outlen); size_t SSL_SESSION_get_master_key(const SSL_SESSION *session, unsigned char *out, size_t outlen); int SSL_SESSION_set1_master_key(SSL_SESSION *sess, const unsigned char *in, size_t len); =head1 DESCRIPTION SSL_get_client_random() extracts the random value sent from the client to the server during the initial SSL/TLS handshake. It copies as many bytes as it can of this value into the buffer provided in B<out>, which must have at least B<outlen> bytes available. It returns the total number of bytes that were actually copied. If B<outlen> is zero, SSL_get_client_random() copies nothing, and returns the total size of the client_random value. SSL_get_server_random() behaves the same, but extracts the random value sent from the server to the client during the initial SSL/TLS handshake. SSL_SESSION_get_master_key() behaves the same, but extracts the master secret used to guarantee the security of the SSL/TLS session. This one can be dangerous if misused; see NOTES below. SSL_SESSION_set1_master_key() sets the master key value associated with the SSL_SESSION B<sess>. For example, this could be used to set up a session based PSK (see L<SSL_CTX_set_psk_use_session_callback(3)>). The master key of length B<len> should be provided at B<in>. The supplied master key is copied by the function, so the caller is responsible for freeing and cleaning any memory associated with B<in>. The caller must ensure that the length of the key is suitable for the ciphersuite associated with the SSL_SESSION. =head1 NOTES You probably shouldn't use these functions. These functions expose internal values from the TLS handshake, for use in low-level protocols. You probably should not use them, unless you are implementing something that needs access to the internal protocol details. Despite the names of SSL_get_client_random() and SSL_get_server_random(), they ARE NOT random number generators. Instead, they return the mostly-random values that were already generated and used in the TLS protocol. Using them in place of RAND_bytes() would be grossly foolish. The security of your TLS session depends on keeping the master key secret: do not expose it, or any information about it, to anybody. If you need to calculate another secret value that depends on the master secret, you should probably use SSL_export_keying_material() instead, and forget that you ever saw these functions. In current versions of the TLS protocols, the length of client_random (and also server_random) is always SSL3_RANDOM_SIZE bytes. Support for other outlen arguments to the SSL_get_*_random() functions is provided in case of the unlikely event that a future version or variant of TLS uses some other length there. Finally, though the "client_random" and "server_random" values are called "random", many TLS implementations will generate four bytes of those values based on their view of the current time. =head1 RETURN VALUES SSL_SESSION_set1_master_key() returns 1 on success or 0 on failure. For the other functions, if B<outlen> is greater than 0 then these functions return the number of bytes actually copied, which will be less than or equal to B<outlen>. If B<outlen> is 0 then these functions return the maximum number of bytes they would copy -- that is, the length of the underlying field. =head1 SEE ALSO L<ssl(7)>, L<RAND_bytes(3)>, L<SSL_export_keying_material(3)>, L<SSL_CTX_set_psk_use_session_callback(3)> =head1 COPYRIGHT Copyright 2015-2017 The OpenSSL Project Authors. All Rights Reserved. Licensed under the OpenSSL license (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at L<https://www.openssl.org/source/license.html>. =cut