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124 .\" ========================================================================
126 .IX Title "d2i_SSL_SESSION 3"
127 .TH d2i_SSL_SESSION 3 "2014-04-07" "1.0.1g" "OpenSSL"
128 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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133 d2i_SSL_SESSION, i2d_SSL_SESSION \- convert SSL_SESSION object from/to ASN1 representation
135 .IX Header "SYNOPSIS"
137 \& #include <openssl/ssl.h>
139 \& SSL_SESSION *d2i_SSL_SESSION(SSL_SESSION **a, const unsigned char **pp, long length);
140 \& int i2d_SSL_SESSION(SSL_SESSION *in, unsigned char **pp);
143 .IX Header "DESCRIPTION"
144 \&\fId2i_SSL_SESSION()\fR transforms the external \s-1ASN1\s0 representation of an \s-1SSL/TLS\s0
145 session, stored as binary data at location \fBpp\fR with length \fBlength\fR, into
146 an \s-1SSL_SESSION\s0 object.
148 \&\fIi2d_SSL_SESSION()\fR transforms the \s-1SSL_SESSION\s0 object \fBin\fR into the \s-1ASN1\s0
149 representation and stores it into the memory location pointed to by \fBpp\fR.
150 The length of the resulting \s-1ASN1\s0 representation is returned. If \fBpp\fR is
151 the \s-1NULL\s0 pointer, only the length is calculated and returned.
154 The \s-1SSL_SESSION\s0 object is built from several \fImalloc()\fRed parts, it can
155 therefore not be moved, copied or stored directly. In order to store
156 session data on disk or into a database, it must be transformed into
157 a binary \s-1ASN1\s0 representation.
159 When using \fId2i_SSL_SESSION()\fR, the \s-1SSL_SESSION\s0 object is automatically
160 allocated. The reference count is 1, so that the session must be
161 explicitly removed using \fISSL_SESSION_free\fR\|(3),
162 unless the \s-1SSL_SESSION\s0 object is completely taken over, when being called
163 inside the \fIget_session_cb()\fR (see
164 \&\fISSL_CTX_sess_set_get_cb\fR\|(3)).
166 \&\s-1SSL_SESSION\s0 objects keep internal link information about the session cache
167 list, when being inserted into one \s-1SSL_CTX\s0 object's session cache.
168 One \s-1SSL_SESSION\s0 object, regardless of its reference count, must therefore
169 only be used with one \s-1SSL_CTX\s0 object (and the \s-1SSL\s0 objects created
170 from this \s-1SSL_CTX\s0 object).
172 When using \fIi2d_SSL_SESSION()\fR, the memory location pointed to by \fBpp\fR must be
173 large enough to hold the binary representation of the session. There is no
174 known limit on the size of the created \s-1ASN1\s0 representation, so the necessary
175 amount of space should be obtained by first calling \fIi2d_SSL_SESSION()\fR with
176 \&\fBpp=NULL\fR, and obtain the size needed, then allocate the memory and
177 call \fIi2d_SSL_SESSION()\fR again.
179 .IX Header "RETURN VALUES"
180 \&\fId2i_SSL_SESSION()\fR returns a pointer to the newly allocated \s-1SSL_SESSION\s0
181 object. In case of failure the NULL-pointer is returned and the error message
182 can be retrieved from the error stack.
184 \&\fIi2d_SSL_SESSION()\fR returns the size of the \s-1ASN1\s0 representation in bytes.
185 When the session is not valid, \fB0\fR is returned and no operation is performed.
187 .IX Header "SEE ALSO"
188 \&\fIssl\fR\|(3), \fISSL_SESSION_free\fR\|(3),
189 \&\fISSL_CTX_sess_set_get_cb\fR\|(3)