d2i_SSL_SESSION, i2d_SSL_SESSION - convert SSL_SESSION object from/to ASN1
SSL_SESSION *d2i_SSL_SESSION(SSL_SESSION **a, const unsigned char **pp, long length);
int i2d_SSL_SESSION(SSL_SESSION *in, unsigned char **pp);
transforms the external ASN1 representation of an
SSL/TLS session, stored as binary data at location pp
, into an SSL_SESSION object.
transforms the SSL_SESSION object in
ASN1 representation and stores it into the memory location pointed to by
. The length of the resulting ASN1 representation is returned. If
is the NULL pointer, only the length is calculated and returned.
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
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()
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
, and obtain the size needed, then
allocate the memory and call i2d_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.
returns the size of the ASN1 representation in bytes.
When the session is not valid, 0
is returned and no operation is