NAME    [Toc]    [Back]

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

LIBRARY    [Toc]    [Back]

       libcrypto, -lcrypto

SYNOPSIS    [Toc]    [Back]

        #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    [Toc]    [Back]

       d2i_SSL_SESSION() transforms the external ASN1 representation
 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 memory
       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    [Toc]    [Back]

       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_SES-
       SION() again.

RETURN VALUES    [Toc]    [Back]

       d2i_SSL_SESSION() returns a pointer to the newly allocated
       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
       representation in bytes.  When the session is not valid, 0
       is returned and no operation is performed.

SEE ALSO    [Toc]    [Back]

       ssl(3), SSL_SESSION_free(3), SSL_CTX_sess_set_get_cb(3)



2002-06-10                    0.9.6g           d2i_SSL_SESSION(3)