196 lines
6.1 KiB
Groff
196 lines
6.1 KiB
Groff
.\" $NetBSD: d2i_SSL_SESSION.3,v 1.1 2001/04/12 10:45:45 itojun Exp $
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.\" ======================================================================
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.\"
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.IX Title "d2i_SSL_SESSION 3"
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.TH d2i_SSL_SESSION 3 "0.9.6a" "2001-04-12" "OpenSSL"
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.UC
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.SH "NAME"
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d2i_SSL_SESSION, i2d_SSL_SESSION \- convert \s-1SSL_SESSION\s0 object from/to \s-1ASN1\s0 representation
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/ssl.h>
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.Ve
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.Vb 2
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\& SSL_SESSION *d2i_SSL_SESSION(SSL_SESSION **a, unsigned char **pp, long length);
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\& int i2d_SSL_SESSION(SSL_SESSION *in, unsigned char **pp);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fId2i_SSL_SESSION()\fR transforms the external \s-1ASN1\s0 representation of an \s-1SSL/TLS\s0
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session, stored as binary data at location \fBpp\fR with length \fBlength\fR, into
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an \s-1SSL_SESSION\s0 object.
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.PP
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\&\fIi2d_SSL_SESSION()\fR transforms the \s-1SSL_SESSION\s0 object \fBin\fR into the \s-1ASN1\s0
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representation and stores it into the memory location pointed to by \fBpp\fR.
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The length of the resulting \s-1ASN1\s0 representation is returned. If \fBpp\fR is
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the \s-1NULL\s0 pointer, only the length is calculated and returned.
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.SH "NOTES"
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.IX Header "NOTES"
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The \s-1SSL_SESSION\s0 object is built from several \fImalloc()\fRed parts, it can
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therefore not be moved, copied or stored directly. In order to store
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session data on disk or into a database, it must be transformed into
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a binary \s-1ASN1\s0 representation.
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.PP
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When using \fId2i_SSL_SESSION()\fR, the \s-1SSL_SESSION\s0 object is automatically
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allocated.
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.PP
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When using \fIi2d_SSL_SESSION()\fR, the memory location pointed to by \fBpp\fR must be
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large enough to hold the binary representation of the session. There is no
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known limit on the size of the created \s-1ASN1\s0 representation, so the necessary
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amount of space should be obtained by first calling \fIi2d_SSL_SESSION()\fR with
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\&\fBpp=NULL\fR, and obtain the size needed, then allocate the memory and
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call \fIi2d_SSL_SESSION()\fR again.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fId2i_SSL_SESSION()\fR returns a pointer to the newly allocated \s-1SSL_SESSION\s0
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object. In case of failure the NULL-pointer is returned and the error message
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can be retrieved from the error stack.
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.PP
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\&\fIi2d_SSL_SESSION()\fR returns the size of the \s-1ASN1\s0 representation in bytes.
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When the session is not valid, \fB0\fR is returned and no operation is performed.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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ssl(3),
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SSL_CTX_sess_set_get_cb(3)
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