364 lines
16 KiB
Plaintext
364 lines
16 KiB
Plaintext
.\" Automatically generated by Pod::Man 2.27 (Pod::Simple 3.28)
|
|
.\"
|
|
.\" Standard preamble:
|
|
.\" ========================================================================
|
|
.de Sp \" Vertical space (when we can't use .PP)
|
|
.if t .sp .5v
|
|
.if n .sp
|
|
..
|
|
.de Vb \" Begin verbatim text
|
|
.ft CW
|
|
.nf
|
|
.ne \\$1
|
|
..
|
|
.de Ve \" End verbatim text
|
|
.ft R
|
|
.fi
|
|
..
|
|
.\" Set up some character translations and predefined strings. \*(-- will
|
|
.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
|
|
.\" double quote, and \*(R" will give a right double quote. \*(C+ will
|
|
.\" give a nicer C++. Capital omega is used to do unbreakable dashes and
|
|
.\" therefore won't be available. \*(C` and \*(C' expand to `' in nroff,
|
|
.\" nothing in troff, for use with C<>.
|
|
.tr \(*W-
|
|
.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
|
|
.ie n \{\
|
|
. ds -- \(*W-
|
|
. ds PI pi
|
|
. if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
|
|
. if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch
|
|
. ds L" ""
|
|
. ds R" ""
|
|
. ds C` ""
|
|
. ds C' ""
|
|
'br\}
|
|
.el\{\
|
|
. ds -- \|\(em\|
|
|
. ds PI \(*p
|
|
. ds L" ``
|
|
. ds R" ''
|
|
. ds C`
|
|
. ds C'
|
|
'br\}
|
|
.\"
|
|
.\" Escape single quotes in literal strings from groff's Unicode transform.
|
|
.ie \n(.g .ds Aq \(aq
|
|
.el .ds Aq '
|
|
.\"
|
|
.\" If the F register is turned on, we'll generate index entries on stderr for
|
|
.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
|
|
.\" entries marked with X<> in POD. Of course, you'll have to process the
|
|
.\" output yourself in some meaningful fashion.
|
|
.\"
|
|
.\" Avoid warning from groff about undefined register 'F'.
|
|
.de IX
|
|
..
|
|
.nr rF 0
|
|
.if \n(.g .if rF .nr rF 1
|
|
.if (\n(rF:(\n(.g==0)) \{
|
|
. if \nF \{
|
|
. de IX
|
|
. tm Index:\\$1\t\\n%\t"\\$2"
|
|
..
|
|
. if !\nF==2 \{
|
|
. nr % 0
|
|
. nr F 2
|
|
. \}
|
|
. \}
|
|
.\}
|
|
.rr rF
|
|
.\"
|
|
.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
|
|
.\" Fear. Run. Save yourself. No user-serviceable parts.
|
|
. \" fudge factors for nroff and troff
|
|
.if n \{\
|
|
. ds #H 0
|
|
. ds #V .8m
|
|
. ds #F .3m
|
|
. ds #[ \f1
|
|
. ds #] \fP
|
|
.\}
|
|
.if t \{\
|
|
. ds #H ((1u-(\\\\n(.fu%2u))*.13m)
|
|
. ds #V .6m
|
|
. ds #F 0
|
|
. ds #[ \&
|
|
. ds #] \&
|
|
.\}
|
|
. \" simple accents for nroff and troff
|
|
.if n \{\
|
|
. ds ' \&
|
|
. ds ` \&
|
|
. ds ^ \&
|
|
. ds , \&
|
|
. ds ~ ~
|
|
. ds /
|
|
.\}
|
|
.if t \{\
|
|
. ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
|
|
. ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
|
|
. ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u'
|
|
. ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
|
|
. ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
|
|
. ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
|
|
.\}
|
|
. \" troff and (daisy-wheel) nroff accents
|
|
.ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
|
|
.ds 8 \h'\*(#H'\(*b\h'-\*(#H'
|
|
.ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#]
|
|
.ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
|
|
.ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
|
|
.ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
|
|
.ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
|
|
.ds ae a\h'-(\w'a'u*4/10)'e
|
|
.ds Ae A\h'-(\w'A'u*4/10)'E
|
|
. \" corrections for vroff
|
|
.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
|
|
.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
|
|
. \" for low resolution devices (crt and lpr)
|
|
.if \n(.H>23 .if \n(.V>19 \
|
|
\{\
|
|
. ds : e
|
|
. ds 8 ss
|
|
. ds o a
|
|
. ds d- d\h'-1'\(ga
|
|
. ds D- D\h'-1'\(hy
|
|
. ds th \o'bp'
|
|
. ds Th \o'LP'
|
|
. ds ae ae
|
|
. ds Ae AE
|
|
.\}
|
|
.rm #[ #] #H #V #F C
|
|
.\" ========================================================================
|
|
.\"
|
|
.IX Title "PROVIDER-KEYEXCH 7ossl"
|
|
.TH PROVIDER-KEYEXCH 7ossl "2024-01-30" "3.2.1" "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"
|
|
provider\-keyexch \- The keyexch library <\-> provider functions
|
|
.SH "SYNOPSIS"
|
|
.IX Header "SYNOPSIS"
|
|
.Vb 2
|
|
\& #include <openssl/core_dispatch.h>
|
|
\& #include <openssl/core_names.h>
|
|
\&
|
|
\& /*
|
|
\& * None of these are actual functions, but are displayed like this for
|
|
\& * the function signatures for functions that are offered as function
|
|
\& * pointers in OSSL_DISPATCH arrays.
|
|
\& */
|
|
\&
|
|
\& /* Context management */
|
|
\& void *OSSL_FUNC_keyexch_newctx(void *provctx);
|
|
\& void OSSL_FUNC_keyexch_freectx(void *ctx);
|
|
\& void *OSSL_FUNC_keyexch_dupctx(void *ctx);
|
|
\&
|
|
\& /* Shared secret derivation */
|
|
\& int OSSL_FUNC_keyexch_init(void *ctx, void *provkey,
|
|
\& const OSSL_PARAM params[]);
|
|
\& int OSSL_FUNC_keyexch_set_peer(void *ctx, void *provkey);
|
|
\& int OSSL_FUNC_keyexch_derive(void *ctx, unsigned char *secret, size_t *secretlen,
|
|
\& size_t outlen);
|
|
\&
|
|
\& /* Key Exchange parameters */
|
|
\& int OSSL_FUNC_keyexch_set_ctx_params(void *ctx, const OSSL_PARAM params[]);
|
|
\& const OSSL_PARAM *OSSL_FUNC_keyexch_settable_ctx_params(void *ctx,
|
|
\& void *provctx);
|
|
\& int OSSL_FUNC_keyexch_get_ctx_params(void *ctx, OSSL_PARAM params[]);
|
|
\& const OSSL_PARAM *OSSL_FUNC_keyexch_gettable_ctx_params(void *ctx,
|
|
\& void *provctx);
|
|
.Ve
|
|
.SH "DESCRIPTION"
|
|
.IX Header "DESCRIPTION"
|
|
This documentation is primarily aimed at provider authors. See \fIprovider\fR\|(7)
|
|
for further information.
|
|
.PP
|
|
The key exchange (\s-1OSSL_OP_KEYEXCH\s0) operation enables providers to implement key
|
|
exchange algorithms and make them available to applications via
|
|
\&\fIEVP_PKEY_derive\fR\|(3) and
|
|
other related functions).
|
|
.PP
|
|
All \*(L"functions\*(R" mentioned here are passed as function pointers between
|
|
\&\fIlibcrypto\fR and the provider in \s-1\fIOSSL_DISPATCH\s0\fR\|(3) arrays via
|
|
\&\s-1\fIOSSL_ALGORITHM\s0\fR\|(3) arrays that are returned by the provider's
|
|
\&\fIprovider_query_operation()\fR function
|
|
(see \*(L"Provider Functions\*(R" in \fIprovider\-base\fR\|(7)).
|
|
.PP
|
|
All these \*(L"functions\*(R" have a corresponding function type definition
|
|
named \fBOSSL_FUNC_{name}_fn\fR, and a helper function to retrieve the
|
|
function pointer from an \s-1\fIOSSL_DISPATCH\s0\fR\|(3) element named
|
|
\&\fBOSSL_FUNC_{name}\fR.
|
|
For example, the \*(L"function\*(R" \fIOSSL_FUNC_keyexch_newctx()\fR has these:
|
|
.PP
|
|
.Vb 3
|
|
\& typedef void *(OSSL_FUNC_keyexch_newctx_fn)(void *provctx);
|
|
\& static ossl_inline OSSL_FUNC_keyexch_newctx_fn
|
|
\& OSSL_FUNC_keyexch_newctx(const OSSL_DISPATCH *opf);
|
|
.Ve
|
|
.PP
|
|
\&\s-1\fIOSSL_DISPATCH\s0\fR\|(3) arrays are indexed by numbers that are provided as
|
|
macros in \fIopenssl\-core_dispatch.h\fR\|(7), as follows:
|
|
.PP
|
|
.Vb 3
|
|
\& OSSL_FUNC_keyexch_newctx OSSL_FUNC_KEYEXCH_NEWCTX
|
|
\& OSSL_FUNC_keyexch_freectx OSSL_FUNC_KEYEXCH_FREECTX
|
|
\& OSSL_FUNC_keyexch_dupctx OSSL_FUNC_KEYEXCH_DUPCTX
|
|
\&
|
|
\& OSSL_FUNC_keyexch_init OSSL_FUNC_KEYEXCH_INIT
|
|
\& OSSL_FUNC_keyexch_set_peer OSSL_FUNC_KEYEXCH_SET_PEER
|
|
\& OSSL_FUNC_keyexch_derive OSSL_FUNC_KEYEXCH_DERIVE
|
|
\&
|
|
\& OSSL_FUNC_keyexch_set_ctx_params OSSL_FUNC_KEYEXCH_SET_CTX_PARAMS
|
|
\& OSSL_FUNC_keyexch_settable_ctx_params OSSL_FUNC_KEYEXCH_SETTABLE_CTX_PARAMS
|
|
\& OSSL_FUNC_keyexch_get_ctx_params OSSL_FUNC_KEYEXCH_GET_CTX_PARAMS
|
|
\& OSSL_FUNC_keyexch_gettable_ctx_params OSSL_FUNC_KEYEXCH_GETTABLE_CTX_PARAMS
|
|
.Ve
|
|
.PP
|
|
A key exchange algorithm implementation may not implement all of these functions.
|
|
In order to be a consistent set of functions a provider must implement
|
|
OSSL_FUNC_keyexch_newctx, OSSL_FUNC_keyexch_freectx, OSSL_FUNC_keyexch_init and OSSL_FUNC_keyexch_derive.
|
|
All other functions are optional.
|
|
.PP
|
|
A key exchange algorithm must also implement some mechanism for generating,
|
|
loading or importing keys via the key management (\s-1OSSL_OP_KEYMGMT\s0) operation.
|
|
See \fIprovider\-keymgmt\fR\|(7) for further details.
|
|
.SS "Context Management Functions"
|
|
.IX Subsection "Context Management Functions"
|
|
\&\fIOSSL_FUNC_keyexch_newctx()\fR should create and return a pointer to a provider side
|
|
structure for holding context information during a key exchange operation.
|
|
A pointer to this context will be passed back in a number of the other key
|
|
exchange operation function calls.
|
|
The parameter \fIprovctx\fR is the provider context generated during provider
|
|
initialisation (see \fIprovider\fR\|(7)).
|
|
.PP
|
|
\&\fIOSSL_FUNC_keyexch_freectx()\fR is passed a pointer to the provider side key exchange
|
|
context in the \fIctx\fR parameter.
|
|
This function should free any resources associated with that context.
|
|
.PP
|
|
\&\fIOSSL_FUNC_keyexch_dupctx()\fR should duplicate the provider side key exchange context in
|
|
the \fIctx\fR parameter and return the duplicate copy.
|
|
.SS "Shared Secret Derivation Functions"
|
|
.IX Subsection "Shared Secret Derivation Functions"
|
|
\&\fIOSSL_FUNC_keyexch_init()\fR initialises a key exchange operation given a provider side key
|
|
exchange context in the \fIctx\fR parameter, and a pointer to a provider key object
|
|
in the \fIprovkey\fR parameter.
|
|
The \fIparams\fR, if not \s-1NULL,\s0 should be set on the context in a manner similar to
|
|
using \fIOSSL_FUNC_keyexch_set_params()\fR.
|
|
The key object should have been previously
|
|
generated, loaded or imported into the provider using the key management
|
|
(\s-1OSSL_OP_KEYMGMT\s0) operation (see \fIprovider\-keymgmt\fR\|(7)>.
|
|
.PP
|
|
\&\fIOSSL_FUNC_keyexch_set_peer()\fR is called to supply the peer's public key (in the
|
|
\&\fIprovkey\fR parameter) to be used when deriving the shared secret.
|
|
It is also passed a previously initialised key exchange context in the \fIctx\fR
|
|
parameter.
|
|
The key object should have been previously generated, loaded or imported into
|
|
the provider using the key management (\s-1OSSL_OP_KEYMGMT\s0) operation (see
|
|
\&\fIprovider\-keymgmt\fR\|(7)>.
|
|
.PP
|
|
\&\fIOSSL_FUNC_keyexch_derive()\fR performs the actual key exchange itself by deriving a shared
|
|
secret.
|
|
A previously initialised key exchange context is passed in the \fIctx\fR
|
|
parameter.
|
|
The derived secret should be written to the location \fIsecret\fR which should not
|
|
exceed \fIoutlen\fR bytes.
|
|
The length of the shared secret should be written to \fI*secretlen\fR.
|
|
If \fIsecret\fR is \s-1NULL\s0 then the maximum length of the shared secret should be
|
|
written to \fI*secretlen\fR.
|
|
.SS "Key Exchange Parameters Functions"
|
|
.IX Subsection "Key Exchange Parameters Functions"
|
|
\&\fIOSSL_FUNC_keyexch_set_ctx_params()\fR sets key exchange parameters associated with the
|
|
given provider side key exchange context \fIctx\fR to \fIparams\fR,
|
|
see \*(L"Common Key Exchange parameters\*(R".
|
|
Any parameter settings are additional to any that were previously set.
|
|
Passing \s-1NULL\s0 for \fIparams\fR should return true.
|
|
.PP
|
|
\&\fIOSSL_FUNC_keyexch_get_ctx_params()\fR gets key exchange parameters associated with the
|
|
given provider side key exchange context \fIctx\fR into \fIparams\fR,
|
|
see \*(L"Common Key Exchange parameters\*(R".
|
|
Passing \s-1NULL\s0 for \fIparams\fR should return true.
|
|
.PP
|
|
\&\fIOSSL_FUNC_keyexch_settable_ctx_params()\fR yields a constant \s-1\fIOSSL_PARAM\s0\fR\|(3) array that
|
|
describes the settable parameters, i.e. parameters that can be used with
|
|
\&\fIOP_signature_set_ctx_params()\fR.
|
|
If \fIOSSL_FUNC_keyexch_settable_ctx_params()\fR is present, \fIOSSL_FUNC_keyexch_set_ctx_params()\fR must
|
|
also be present, and vice versa.
|
|
Similarly, \fIOSSL_FUNC_keyexch_gettable_ctx_params()\fR yields a constant \s-1\fIOSSL_PARAM\s0\fR\|(3)
|
|
array that describes the gettable parameters, i.e. parameters that can be
|
|
handled by \fIOP_signature_get_ctx_params()\fR.
|
|
If \fIOSSL_FUNC_keyexch_gettable_ctx_params()\fR is present, \fIOSSL_FUNC_keyexch_get_ctx_params()\fR must
|
|
also be present, and vice versa.
|
|
.PP
|
|
Notice that not all settable parameters are also gettable, and vice versa.
|
|
.SS "Common Key Exchange parameters"
|
|
.IX Subsection "Common Key Exchange parameters"
|
|
See \s-1\fIOSSL_PARAM\s0\fR\|(3) for further details on the parameters structure used by
|
|
the \fIOSSL_FUNC_keyexch_set_ctx_params()\fR and \fIOSSL_FUNC_keyexch_get_ctx_params()\fR functions.
|
|
.PP
|
|
Common parameters currently recognised by built-in key exchange algorithms are
|
|
as follows.
|
|
.ie n .IP """kdf-type"" (\fB\s-1OSSL_EXCHANGE_PARAM_KDF_TYPE\s0\fR) <\s-1UTF8\s0 string>" 4
|
|
.el .IP "``kdf-type'' (\fB\s-1OSSL_EXCHANGE_PARAM_KDF_TYPE\s0\fR) <\s-1UTF8\s0 string>" 4
|
|
.IX Item "kdf-type (OSSL_EXCHANGE_PARAM_KDF_TYPE) <UTF8 string>"
|
|
Sets or gets the Key Derivation Function type to apply within the associated key
|
|
exchange ctx.
|
|
.ie n .IP """kdf-digest"" (\fB\s-1OSSL_EXCHANGE_PARAM_KDF_DIGEST\s0\fR) <\s-1UTF8\s0 string>" 4
|
|
.el .IP "``kdf-digest'' (\fB\s-1OSSL_EXCHANGE_PARAM_KDF_DIGEST\s0\fR) <\s-1UTF8\s0 string>" 4
|
|
.IX Item "kdf-digest (OSSL_EXCHANGE_PARAM_KDF_DIGEST) <UTF8 string>"
|
|
Sets or gets the Digest algorithm to be used as part of the Key Derivation Function
|
|
associated with the given key exchange ctx.
|
|
.ie n .IP """kdf-digest-props"" (\fB\s-1OSSL_EXCHANGE_PARAM_KDF_DIGEST_PROPS\s0\fR) <\s-1UTF8\s0 string>" 4
|
|
.el .IP "``kdf-digest-props'' (\fB\s-1OSSL_EXCHANGE_PARAM_KDF_DIGEST_PROPS\s0\fR) <\s-1UTF8\s0 string>" 4
|
|
.IX Item "kdf-digest-props (OSSL_EXCHANGE_PARAM_KDF_DIGEST_PROPS) <UTF8 string>"
|
|
Sets properties to be used upon look up of the implementation for the selected
|
|
Digest algorithm for the Key Derivation Function associated with the given key
|
|
exchange ctx.
|
|
.ie n .IP """kdf-outlen"" (\fB\s-1OSSL_EXCHANGE_PARAM_KDF_OUTLEN\s0\fR) <unsigned integer>" 4
|
|
.el .IP "``kdf-outlen'' (\fB\s-1OSSL_EXCHANGE_PARAM_KDF_OUTLEN\s0\fR) <unsigned integer>" 4
|
|
.IX Item "kdf-outlen (OSSL_EXCHANGE_PARAM_KDF_OUTLEN) <unsigned integer>"
|
|
Sets or gets the desired size for the output of the chosen Key Derivation Function
|
|
associated with the given key exchange ctx.
|
|
The length of the \*(L"kdf-outlen\*(R" parameter should not exceed that of a \fBsize_t\fR.
|
|
.ie n .IP """kdf-ukm"" (\fB\s-1OSSL_EXCHANGE_PARAM_KDF_UKM\s0\fR) <octet string>" 4
|
|
.el .IP "``kdf-ukm'' (\fB\s-1OSSL_EXCHANGE_PARAM_KDF_UKM\s0\fR) <octet string>" 4
|
|
.IX Item "kdf-ukm (OSSL_EXCHANGE_PARAM_KDF_UKM) <octet string>"
|
|
Sets the User Key Material to be used as part of the selected Key Derivation
|
|
Function associated with the given key exchange ctx.
|
|
.ie n .IP """kdf-ukm"" (\fB\s-1OSSL_EXCHANGE_PARAM_KDF_UKM\s0\fR) <octet string ptr>" 4
|
|
.el .IP "``kdf-ukm'' (\fB\s-1OSSL_EXCHANGE_PARAM_KDF_UKM\s0\fR) <octet string ptr>" 4
|
|
.IX Item "kdf-ukm (OSSL_EXCHANGE_PARAM_KDF_UKM) <octet string ptr>"
|
|
Gets a pointer to the User Key Material to be used as part of the selected
|
|
Key Derivation Function associated with the given key exchange ctx. Providers
|
|
usually do not need to support this gettable parameter as its sole purpose
|
|
is to support functionality of the deprecated \fIEVP_PKEY_CTX_get0_ecdh_kdf_ukm()\fR
|
|
and \fIEVP_PKEY_CTX_get0_dh_kdf_ukm()\fR functions.
|
|
.SH "RETURN VALUES"
|
|
.IX Header "RETURN VALUES"
|
|
\&\fIOSSL_FUNC_keyexch_newctx()\fR and \fIOSSL_FUNC_keyexch_dupctx()\fR should return the newly created
|
|
provider side key exchange context, or \s-1NULL\s0 on failure.
|
|
.PP
|
|
\&\fIOSSL_FUNC_keyexch_init()\fR, \fIOSSL_FUNC_keyexch_set_peer()\fR, \fIOSSL_FUNC_keyexch_derive()\fR,
|
|
\&\fIOSSL_FUNC_keyexch_set_params()\fR, and \fIOSSL_FUNC_keyexch_get_params()\fR should return 1 for success
|
|
or 0 on error.
|
|
.PP
|
|
\&\fIOSSL_FUNC_keyexch_settable_ctx_params()\fR and \fIOSSL_FUNC_keyexch_gettable_ctx_params()\fR should
|
|
always return a constant \s-1\fIOSSL_PARAM\s0\fR\|(3) array.
|
|
.SH "SEE ALSO"
|
|
.IX Header "SEE ALSO"
|
|
\&\fIprovider\fR\|(7)
|
|
.SH "HISTORY"
|
|
.IX Header "HISTORY"
|
|
The provider \s-1KEYEXCH\s0 interface was introduced in OpenSSL 3.0.
|
|
.SH "COPYRIGHT"
|
|
.IX Header "COPYRIGHT"
|
|
Copyright 2019\-2022 The OpenSSL Project Authors. All Rights Reserved.
|
|
.PP
|
|
Licensed under the Apache License 2.0 (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
|
|
<https://www.openssl.org/source/license.html>.
|