SSL_CTX_new(3)              OpenSSL              SSL_CTX_new(3)





NAME
       SSL_CTX_new - create a new SSL_CTX object as framework
       for TLS/SSL enabled functions

SYNOPSIS
        #include <openssl/ssl.h>

        SSL_CTX *SSL_CTX_new(SSL_METHOD *method);

DESCRIPTION
       SSL_CTX_new() creates a new SSL_CTX object as framework
       to establish TLS/SSL enabled connections.

NOTES
       The SSL_CTX object uses method as connection method. The
       methods exist in a generic type (for client and server
       use), a server only type, and a client only type. method
       can be of the following types:

       SSLv2_method(void), SSLv2_server_method(void),
       SSLv2_client_method(void)
           A TLS/SSL connection established with these methods
           will only understand the SSLv2 protocol. A client
           will send out SSLv2 client hello messages and will
           also indicate that it only understand SSLv2. A
           server will only understand SSLv2 client hello mes-
           sages.

       SSLv3_method(void), SSLv3_server_method(void),
       SSLv3_client_method(void)
           A TLS/SSL connection established with these methods
           will only understand the SSLv3 protocol. A client
           will send out SSLv3 client hello messages and will
           indicate that it only understands SSLv3. A server
           will only understand SSLv3 client hello messages.
           This especially means, that it will not understand
           SSLv2 client hello messages which are widely used
           for compatibility reasons, see SSLv23_*_method().

       TLSv1_method(void), TLSv1_server_method(void),
       TLSv1_client_method(void)
           A TLS/SSL connection established with these methods
           will only understand the TLSv1 protocol. A client
           will send out TLSv1 client hello messages and will
           indicate that it only understands TLSv1. A server
           will only understand TLSv1 client hello messages.
           This especially means, that it will not understand
           SSLv2 client hello messages which are widely used
           for compatibility reasons, see SSLv23_*_method(). It
           will also not understand SSLv3 client hello mes-
           sages.

       SSLv23_method(void), SSLv23_server_method(void),
       SSLv23_client_method(void)
           A TLS/SSL connection established with these methods
           will understand the SSLv2, SSLv3, and TLSv1 proto-
           col. A client will send out SSLv2 client hello mes-
           sages and will indicate that it also understands
           SSLv3 and TLSv1. A server will understand SSLv2,
           SSLv3, and TLSv1 client hello messages. This is the
           best choice when compatibility is a concern.

       The list of protocols available can later be limited
       using the SSL_OP_NO_SSLv2, SSL_OP_NO_SSLv3,
       SSL_OP_NO_TLSv1 options of the SSL_CTX_set_options() or
       SSL_set_options() functions. Using these options it is
       possible to choose e.g. SSLv23_server_method() and be
       able to negotiate with all possible clients, but to only
       allow newer protocols like SSLv3 or TLSv1.

       SSL_CTX_new() initializes the list of ciphers, the ses-
       sion cache setting, the callbacks, the keys and certifi-
       cates, and the options to its default values.

RETURN VALUES
       The following return values can occur:

       NULL
           The creation of a new SSL_CTX object failed. Check
           the error stack to find out the reason.

       Pointer to an SSL_CTX object
           The return value points to an allocated SSL_CTX
           object.

SEE ALSO
       SSL_CTX_free(3), SSL_accept(3), ssl(3),  SSL_set_con-
       nect_state(3)



0.9.7c                     2001-07-25            SSL_CTX_new(3)
