d2i_SSL_SESSION(3)

     d2i_SSL_SESSION(3)     0.9.6h (2001-10-12)     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
          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

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     d2i_SSL_SESSION(3)     0.9.6h (2001-10-12)     d2i_SSL_SESSION(3)

          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)

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