d2i_SSL_SESSION(3) OpenSSL d2i_SSL_SESSION(3)
d2i_SSL_SESSION, i2d_SSL_SESSION - convert SSL_SESSION object from/to ASN1 representation
SSL_SESSION *d2i_SSL_SESSION(SSL_SESSION **a, unsigned char **pp, long length);
int i2d_SSL_SESSION(SSL_SESSION *in, unsigned char **pp);
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
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 data-
base, it must be transformed into a binary ASN1 representation.
When using d2i_SSL_SESSION(), the SSL_SESSION object is automatically allocated. The ref-
erence count is 1, so that the session must be explicitly removed using SSL_SES-
SION_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, regard-
less 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 mem-
ory and call i2d_SSL_SESSION() again.
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
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.
ssl(3), SSL_SESSION_free(3), SSL_CTX_sess_set_get_cb(3)
0.9.7d 2002-12-01 d2i_SSL_SESSION(3)