d2i_SSL_SESSION(3)          OpenSSL          d2i_SSL_SESSION(3)





NAME
       d2i_SSL_SESSION, i2d_SSL_SESSION - convert SSL_SESSION
       object from/to ASN1 representation

SYNOPSIS
        #include <openssl/ssl.h>

        SSL_SESSION *d2i_SSL_SESSION(SSL_SESSION **a, unsigned char **pp, long length);
        int i2d_SSL_SESSION(SSL_SESSION *in, unsigned char **pp);

DESCRIPTION
       d2i_SSL_SESSION() transforms the external ASN1 represen-
       tation of an SSL/TLS session, stored as binary data at
       location pp with length length, into an SSL_SESSION
       object.

       i2d_SSL_SESSION() transforms the SSL_SESSION object in
       into the ASN1 representation and stores it into the mem-
       ory location pointed to by pp.  The length of the
       resulting ASN1 representation is returned. If pp is the
       NULL pointer, only the length is calculated and
       returned.

NOTES
       The SSL_SESSION object is built from several malloc()ed
       parts, it can therefore not be moved, copied or stored
       directly. In order to store session data on disk or into
       a database, it must be transformed into a binary ASN1
       representation.

       When using d2i_SSL_SESSION(), the SSL_SESSION object is
       automatically allocated. The reference count is 1, so
       that the session must be explicitly removed using
       SSL_SESSION_free(3), unless the SSL_SESSION object is
       completely taken over, when being called inside the
       get_session_cb() (see SSL_CTX_sess_set_get_cb(3)).

       SSL_SESSION objects keep internal link information about
       the session cache list, when being inserted into one
       SSL_CTX object's session cache.  One SSL_SESSION object,
       regardless of its reference count, must therefore only
       be used with one SSL_CTX object (and the SSL objects
       created from this SSL_CTX object).

       When using i2d_SSL_SESSION(), the memory location
       pointed to by pp must be large enough to hold the binary
       representation of the session. There is no known limit
       on the size of the created ASN1 representation, so the
       necessary amount of space should be obtained by first
       calling i2d_SSL_SESSION() with pp=NULL, and obtain the
       size needed, then allocate the memory and call
       i2d_SSL_SESSION() again.

RETURN VALUES
       d2i_SSL_SESSION() returns a pointer to the newly allo-
       cated SSL_SESSION object. In case of failure the NULL-
       pointer is returned and the error message can be
       retrieved from the error stack.

       i2d_SSL_SESSION() returns the size of the ASN1 represen-
       tation in bytes.  When the session is not valid, 0 is
       returned and no operation is performed.

SEE ALSO
       ssl(3), SSL_SESSION_free(3), SSL_CTX_sess_set_get_cb(3)



0.9.7c                     2001-10-12        d2i_SSL_SESSION(3)
