d2i_SSL_SESSION.3 revision 110655
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Mon Feb 3 10:02:34 2003

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Title "d2i_SSL_SESSION 3"
d2i_SSL_SESSION 3 "0.9.7" "2003-02-03" "OpenSSL"
C
"NAME"
d2i_SSL_SESSION, i2d_SSL_SESSION - convert \s-1SSL_SESSION\s0 object from/to \s-1ASN1\s0 representation
"SYNOPSIS"
Header "SYNOPSIS" .Vb 1 #include <openssl/ssl.h> .Ve .Vb 2 SSL_SESSION *d2i_SSL_SESSION(SSL_SESSION **a, unsigned char **pp, long length); int i2d_SSL_SESSION(SSL_SESSION *in, unsigned char **pp); .Ve
"DESCRIPTION"
Header "DESCRIPTION" \fId2i_SSL_SESSION() transforms the external \s-1ASN1\s0 representation of an \s-1SSL/TLS\s0 session, stored as binary data at location pp with length length, into an \s-1SSL_SESSION\s0 object.

\fIi2d_SSL_SESSION() transforms the \s-1SSL_SESSION\s0 object in into the \s-1ASN1\s0 representation and stores it into the memory location pointed to by pp. The length of the resulting \s-1ASN1\s0 representation is returned. If pp is the \s-1NULL\s0 pointer, only the length is calculated and returned.

"NOTES"
Header "NOTES" The \s-1SSL_SESSION\s0 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 \s-1ASN1\s0 representation.

When using d2i_SSL_SESSION(), the \s-1SSL_SESSION\s0 object is automatically allocated. The reference count is 1, so that the session must be explicitly removed using SSL_SESSION_free(3), unless the \s-1SSL_SESSION\s0 object is completely taken over, when being called inside the get_session_cb() (see SSL_CTX_sess_set_get_cb(3)).

\s-1SSL_SESSION\s0 objects keep internal link information about the session cache list, when being inserted into one \s-1SSL_CTX\s0 object's session cache. One \s-1SSL_SESSION\s0 object, regardless of its reference count, must therefore only be used with one \s-1SSL_CTX\s0 object (and the \s-1SSL\s0 objects created from this \s-1SSL_CTX\s0 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 \s-1ASN1\s0 representation, so the necessary amount of space should be obtained by first calling i2d_SSL_SESSION() with \fBpp=NULL, and obtain the size needed, then allocate the memory and call i2d_SSL_SESSION() again.

"RETURN VALUES"
Header "RETURN VALUES" \fId2i_SSL_SESSION() returns a pointer to the newly allocated \s-1SSL_SESSION\s0 object. In case of failure the NULL-pointer is returned and the error message can be retrieved from the error stack.

\fIi2d_SSL_SESSION() returns the size of the \s-1ASN1\s0 representation in bytes. When the session is not valid, 0 is returned and no operation is performed.

"SEE ALSO"
Header "SEE ALSO" ssl(3), SSL_SESSION_free(3), SSL_CTX_sess_set_get_cb(3)