/xlv3/openssl/0.9.7e-sgipl1/work/0.9.7e-sgipl1/openssl-
0.9.7e/doc/ssl
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d2i_SSL_SESSION(3) 12/Oct/2001 (0.9.7e) 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.
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d2i_SSL_SESSION(3) 12/Oct/2001 (0.9.7e) d2i_SSL_SESSION(3)
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)
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