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+.\" ========================================================================
+.\"
+.IX Title "d2i_SSL_SESSION 3"
+.TH d2i_SSL_SESSION 3 "2013-02-11" "1.0.1e" "OpenSSL"
+.\" For nroff, turn off justification. Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH "NAME"
+d2i_SSL_SESSION, i2d_SSL_SESSION \- convert SSL_SESSION object from/to ASN1 representation
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/ssl.h>
+\&
+\& SSL_SESSION *d2i_SSL_SESSION(SSL_SESSION **a, const unsigned char **pp, long length);
+\& int i2d_SSL_SESSION(SSL_SESSION *in, unsigned char **pp);
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+\&\fId2i_SSL_SESSION()\fR transforms the external \s-1ASN1\s0 representation of an \s-1SSL/TLS\s0
+session, stored as binary data at location \fBpp\fR with length \fBlength\fR, into
+an \s-1SSL_SESSION\s0 object.
+.PP
+\&\fIi2d_SSL_SESSION()\fR transforms the \s-1SSL_SESSION\s0 object \fBin\fR into the \s-1ASN1\s0
+representation and stores it into the memory location pointed to by \fBpp\fR.
+The length of the resulting \s-1ASN1\s0 representation is returned. If \fBpp\fR is
+the \s-1NULL\s0 pointer, only the length is calculated and returned.
+.SH "NOTES"
+.IX Header "NOTES"
+The \s-1SSL_SESSION\s0 object is built from several \fImalloc()\fRed 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.
+.PP
+When using \fId2i_SSL_SESSION()\fR, the \s-1SSL_SESSION\s0 object is automatically
+allocated. The reference count is 1, so that the session must be
+explicitly removed using \fISSL_SESSION_free\fR\|(3),
+unless the \s-1SSL_SESSION\s0 object is completely taken over, when being called
+inside the \fIget_session_cb()\fR (see
+\&\fISSL_CTX_sess_set_get_cb\fR\|(3)).
+.PP
+\&\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).
+.PP
+When using \fIi2d_SSL_SESSION()\fR, the memory location pointed to by \fBpp\fR 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 \fIi2d_SSL_SESSION()\fR with
+\&\fBpp=NULL\fR, and obtain the size needed, then allocate the memory and
+call \fIi2d_SSL_SESSION()\fR again.
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+\&\fId2i_SSL_SESSION()\fR 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.
+.PP
+\&\fIi2d_SSL_SESSION()\fR returns the size of the \s-1ASN1\s0 representation in bytes.
+When the session is not valid, \fB0\fR is returned and no operation is performed.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+\&\fIssl\fR\|(3), \fISSL_SESSION_free\fR\|(3),
+\&\fISSL_CTX_sess_set_get_cb\fR\|(3)
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