path: root/secure/lib/libcrypto/man/man3/SSL_export_keying_material.3
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+.\" ========================================================================
+.TH SSL_EXPORT_KEYING_MATERIAL 3 "2019-09-10" "1.1.1d" "OpenSSL"
+.\" For nroff, turn off justification. Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+SSL_export_keying_material, SSL_export_keying_material_early \&\- obtain keying material for application use
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/ssl.h>
+\& int SSL_export_keying_material(SSL *s, unsigned char *out, size_t olen,
+\& const char *label, size_t llen,
+\& const unsigned char *context,
+\& size_t contextlen, int use_context);
+\& int SSL_export_keying_material_early(SSL *s, unsigned char *out, size_t olen,
+\& const char *label, size_t llen,
+\& const unsigned char *context,
+\& size_t contextlen);
+During the creation of a \s-1TLS\s0 or \s-1DTLS\s0 connection shared keying material is
+established between the two endpoints. The functions
+\&\fBSSL_export_keying_material()\fR and \fBSSL_export_keying_material_early()\fR enable an
+application to use some of this keying material for its own purposes in
+accordance with \s-1RFC5705\s0 (for TLSv1.2 and below) or \s-1RFC8446\s0 (for TLSv1.3).
+\&\fBSSL_export_keying_material()\fR derives keying material using
+the \fIexporter_master_secret\fR established in the handshake.
+\&\fBSSL_export_keying_material_early()\fR is only usable with TLSv1.3, and derives
+keying material using the \fIearly_exporter_master_secret\fR (as defined in the
+\&\s-1TLS 1.3 RFC\s0). For the client, the \fIearly_exporter_master_secret\fR is only
+available when the client attempts to send 0\-RTT data. For the server, it is
+only available when the server accepts 0\-RTT data.
+An application may need to securely establish the context within which this
+keying material will be used. For example this may include identifiers for the
+application session, application algorithms or parameters, or the lifetime of
+the context. The context value is left to the application but must be the same
+on both sides of the communication.
+For a given \s-1SSL\s0 connection \fBs\fR, \fBolen\fR bytes of data will be written to
+\&\fBout\fR. The application specific context should be supplied in the location
+pointed to by \fBcontext\fR and should be \fBcontextlen\fR bytes long. Provision of
+a context is optional. If the context should be omitted entirely then
+\&\fBuse_context\fR should be set to 0. Otherwise it should be any other value. If
+\&\fBuse_context\fR is 0 then the values of \fBcontext\fR and \fBcontextlen\fR are ignored.
+Note that in TLSv1.2 and below a zero length context is treated differently from
+no context at all, and will result in different keying material being returned.
+In TLSv1.3 a zero length context is that same as no context at all and will
+result in the same keying material being returned.
+An application specific label should be provided in the location pointed to by
+\&\fBlabel\fR and should be \fBllen\fR bytes long. Typically this will be a value from
+the \s-1IANA\s0 Exporter Label Registry
+Alternatively labels beginning with \*(L"\s-1EXPERIMENTAL\*(R"\s0 are permitted by the standard
+to be used without registration. TLSv1.3 imposes a maximum label length of
+249 bytes.
+Note that this function is only defined for TLSv1.0 and above, and DTLSv1.0 and
+above. Attempting to use it in SSLv3 will result in an error.
+\&\fBSSL_export_keying_material()\fR returns 0 or \-1 on failure or 1 on success.
+\&\fBSSL_export_keying_material_early()\fR returns 0 on failure or 1 on success.
+.IX Header "HISTORY"
+The \fBSSL_export_keying_material_early()\fR function was added in OpenSSL 1.1.1.
+Copyright 2017\-2018 The OpenSSL Project Authors. All Rights Reserved.
+Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
+this file except in compliance with the License. You can obtain a copy
+in the file \s-1LICENSE\s0 in the source distribution or at