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-.\"
-.\"     $OpenBSD: d2i_SSL_SESSION.3,v 1.2 2014/12/02 14:11:01 jmc Exp $
-.\"
-.Dd $Mdocdate: December 2 2014 $
-.Dt D2I_SSL_SESSION 3
-.Os
-.Sh NAME
-.Nm d2i_SSL_SESSION ,
-.Nm i2d_SSL_SESSION
-.Nd convert SSL_SESSION object from/to ASN1 representation
-.Sh SYNOPSIS
-.In openssl/ssl.h
-.Ft  SSL_SESSION *
-.Fn d2i_SSL_SESSION "SSL_SESSION **a" "const unsigned char **pp" "long length"
-.Ft  int
-.Fn i2d_SSL_SESSION "SSL_SESSION *in" "unsigned char **pp"
-.Sh DESCRIPTION
-.Fn d2i_SSL_SESSION
-transforms the external ASN1 representation of an SSL/TLS session,
-stored as binary data at location
-.Fa pp
-with length
-.Fa length ,
-into
-an
-.Vt SSL_SESSION
-object.
-.Pp
-.Fn i2d_SSL_SESSION
-transforms the
-.Vt SSL_SESSION
-object
-.Fa in
-into the ASN1 representation and stores it into the memory location pointed to
-by
-.Fa pp .
-The length of the resulting ASN1 representation is returned.
-If
-.Fa pp
-is the
-.Dv NULL
-pointer, only the length is calculated and returned.
-.Sh NOTES
-The
-.Vt SSL_SESSION
-object is built from several
-.Xr malloc 3 Ns
--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 representation.
-.Pp
-When using
-.Fn d2i_SSL_SESSION ,
-the
-.Vt SSL_SESSION
-object is automatically allocated.
-The reference count is 1, so that the session must be explicitly removed using
-.Xr SSL_SESSION_free 3 ,
-unless the
-.Vt SSL_SESSION
-object is completely taken over, when being called inside the
-.Xr get_session_cb 3
-(see
-.Xr SSL_CTX_sess_set_get_cb 3 ) .
-.Pp
-.Vt SSL_SESSION
-objects keep internal link information about the session cache list when being
-inserted into one
-.Vt SSL_CTX
-object's session cache.
-One
-.Vt SSL_SESSION
-object, regardless of its reference count, must therefore only be used with one
-.Vt SSL_CTX
-object (and the
-.Vt SSL
-objects created from this
-.Vt SSL_CTX
-object).
-.Pp
-When using
-.Fn i2d_SSL_SESSION ,
-the memory location pointed to by
-.Fa 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
-.Fn i2d_SSL_SESSION
-with
-.Fa pp Ns
-= Ns
-.Dv NULL ,
-and obtain the size needed, then allocate the memory and call
-.Fn i2d_SSL_SESSION
-again.
-Note that this will advance the value contained in
-.Fa *pp
-so it is necessary to save a copy of the original allocation.
-For example:
-.Bd -literal
-int i, j;
-
-char *p, *temp;
-
- i = i2d_SSL_SESSION(sess, NULL);
- p = temp = malloc(i);
- if (temp != NULL) {
-        j = i2d_SSL_SESSION(sess, &temp);
-        assert(i == j);
-        assert(p + i == temp);
- }
-.Ed
-.Sh RETURN VALUES
-.Fn d2i_SSL_SESSION
-returns a pointer to the newly allocated
-.Vt SSL_SESSION
-object.
-In case of failure a
-.Dv NULL
-pointer is returned and the error message can be retrieved from the error
-stack.
-.Pp
-.Fn 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.
-.Sh SEE ALSO
-.Xr ssl 3 ,
-.Xr SSL_CTX_sess_set_get_cb 3 ,
-.Xr SSL_SESSION_free 3