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

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



50                                               2013-03-05                               d2i_SSL_SESSION(3)