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.\" ========================================================================
.\"
.IX Title "d2i_SSL_SESSION 3"
.TH d2i_SSL_SESSION 3 "2019-12-20" "1.0.2u" "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"
\&\fBd2i_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
\&\fBi2d_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 \fBmalloc()\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 \fBd2i_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 \fBSSL_SESSION_free\fR\|(3),
unless the \s-1SSL_SESSION\s0 object is completely taken over, when being called
inside the \fBget_session_cb()\fR (see
\&\fBSSL_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 \fBi2d_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 \fBi2d_SSL_SESSION()\fR with
\&\fBpp=NULL\fR, and obtain the size needed, then allocate the memory and
call \fBi2d_SSL_SESSION()\fR again.
Note that this will advance the value contained in \fB*pp\fR so it is necessary
to save a copy of the original allocation.
For example:
 int i,j;
 char *p, *temp;
 i = i2d_SSL_SESSION(sess, \s-1NULL\s0);
 p = temp = malloc(i);
 j = i2d_SSL_SESSION(sess, &temp);
 assert(i == j);
 assert(p+i == temp);
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBd2i_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
\&\fBi2d_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"
\&\fBssl\fR\|(3), \fBSSL_SESSION_free\fR\|(3),
\&\fBSSL_CTX_sess_set_get_cb\fR\|(3)

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