move documentation to docs repo

11 files changed, 0 insertions, 2498 deletions

diff --git a/doc/Makefile.am b/doc/Makefile.am
index 09793ddcf..33bde2743 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -18,22 +18,6 @@ man_MANS = \
   taler-exchange-benchmark.1 \
   taler.conf.5
 
-AM_MAKEINFOHTMLFLAGS = --no-split --css-ref=docstyle.css --css-ref=brown-paper.css
-
-DISTCLEANFILES = \
-  taler-exchange.cps \
-  taler-exchange.dvi
-
-info_TEXINFOS = \
-  taler-exchange.texi
-extra_TEXINFOS = \
-  fdl-1.3.texi \
-  agpl.texi \
-  syntax.texi
 EXTRA_DIST = \
   coding-style.txt \
   $(man_MANS) \
-  $(extra_TEXINFOS) \
-  docstyle.css \
-  brown-paper.css \
-  exchange-db.png
diff --git a/doc/agpl.texi b/doc/agpl.texi
deleted file mode 100644
index e6ee662e3..000000000
--- a/doc/agpl.texi
+++ /dev/null
@@ -1,698 +0,0 @@
-@c The GNU Affero General Public License.
-@center Version 3, 19 November 2007
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-@c This file is intended to be included within another document,
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-If the Program specifies that a proxy can decide which future versions
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-statement of acceptance of a version permanently authorizes you to
-choose that version for the Program.
-
-Later license versions may give you additional or different
-permissions.  However, no additional obligations are imposed on any
-author or copyright holder as a result of your choosing to follow a
-later version.
-
-@item Disclaimer of Warranty.
-
-THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
-APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
-HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM ``AS IS'' WITHOUT
-WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND
-PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE PROGRAM PROVE
-DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR
-CORRECTION.
-
-@item Limitation of Liability.
-
-IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
-WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR
-CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
-INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES
-ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT
-NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR
-LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM
-TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER
-PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
-
-@item Interpretation of Sections 15 and 16.
-
-If the disclaimer of warranty and limitation of liability provided
-above cannot be given local legal effect according to their terms,
-reviewing courts shall apply local law that most closely approximates
-an absolute waiver of all civil liability in connection with the
-Program, unless a warranty or assumption of liability accompanies a
-copy of the Program in return for a fee.
-
-@end enumerate
-
-@heading END OF TERMS AND CONDITIONS
-
-@heading How to Apply These Terms to Your New Programs
-
-If you develop a new program, and you want it to be of the greatest
-possible use to the public, the best way to achieve this is to make it
-free software which everyone can redistribute and change under these
-terms.
-
-To do so, attach the following notices to the program.  It is safest
-to attach them to the start of each source file to most effectively
-state the exclusion of warranty; and each file should have at least
-the ``copyright'' line and a pointer to where the full notice is found.
-
-@smallexample
-@var{one line to give the program's name and a brief idea of what it does.}
-Copyright (C) @var{year} @var{name of author}
-
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU Affero General Public License as published by
-the Free Software Foundation, either version 3 of the License, or (at
-your option) any later version.
-
-This program is distributed in the hope that it will be useful, but
-WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-Affero General Public License for more details.
-
-You should have received a copy of the GNU Affero General Public License
-along with this program.  If not, see @url{http://www.gnu.org/licenses/}.
-@end smallexample
-
-Also add information on how to contact you by electronic and paper mail.
-
-If your software can interact with users remotely through a computer
-network, you should also make sure that it provides a way for users to
-get its source.  For example, if your program is a web application, its
-interface could display a ``Source'' link that leads users to an archive
-of the code.  There are many ways you could offer source, and different
-solutions will be better for different programs; see section 13 for the
-specific requirements.
-
-You should also get your employer (if you work as a programmer) or school,
-if any, to sign a ``copyright disclaimer'' for the program, if necessary.
-For more information on this, and how to apply and follow the GNU AGPL, see
-@url{http://www.gnu.org/licenses/}.
diff --git a/doc/brown-paper.css b/doc/brown-paper.css
deleted file mode 100644
index 65e2e7902..000000000
--- a/doc/brown-paper.css
+++ /dev/null
@@ -1,63 +0,0 @@
-/*
-
-Brown Paper style from goldblog.com.ua (c) Zaripov Yura <yur4ik7@ukr.net>
-
-*/
-
-.hljs {
-  display: block;
-  overflow-x: auto;
-  padding: 0.5em;
-}
-
-.hljs-keyword,
-.hljs-selector-tag,
-.hljs-literal {
-  color:#005599;
-  font-weight:bold;
-}
-
-.hljs,
-.hljs-subst {
-  color: #363c69;
-}
-
-.hljs-string,
-.hljs-title,
-.hljs-section,
-.hljs-type,
-.hljs-attribute,
-.hljs-symbol,
-.hljs-bullet,
-.hljs-built_in,
-.hljs-addition,
-.hljs-variable,
-.hljs-template-tag,
-.hljs-template-variable,
-.hljs-link,
-.hljs-name {
-  color: #2c009f;
-}
-
-.hljs-comment,
-.hljs-quote,
-.hljs-meta,
-.hljs-deletion {
-  color: #802022;
-}
-
-.hljs-keyword,
-.hljs-selector-tag,
-.hljs-literal,
-.hljs-doctag,
-.hljs-title,
-.hljs-section,
-.hljs-type,
-.hljs-name,
-.hljs-strong {
-  font-weight: bold;
-}
-
-.hljs-emphasis {
-  font-style: italic;
-}
diff --git a/doc/configuration-format.texi b/doc/configuration-format.texi
deleted file mode 100644
index 6453ba601..000000000
--- a/doc/configuration-format.texi
+++ /dev/null
@@ -1,73 +0,0 @@
-@c This file is used both in the exchange and merchant
-@c manuals. Edits should be propagated to both Gits!
-
-@node Configuration format
-@section Configuration format
-@cindex configuration
-
-In Taler realm, any component obeys to the same pattern to get configuration
-values.  According to this pattern, once the component has been installed, the
-installation deploys default values in @cite{$@{prefix@}/share/taler/config.d/}, in
-@cite{.conf} files.  In order to override these defaults, the user can write a custom
-@cite{.conf} file and either pass it to the component at execution time, or name it
-@cite{taler.conf} and place it under @cite{$HOME/.config/}.
-
-
-A config file is a text file containing @cite{sections}, and each section contains
-its @cite{values}. The right format follows:
-
-@example
-[section1]
-value1 = string
-value2 = 23
-
-[section2]
-value21 = string
-value22 = /path22
-@end example
-
-Throughout any configuration file, it is possible to use @code{$}-prefixed variables,
-like @code{$VAR}, especially when they represent filesystem paths.
-It is also possible to provide defaults values for those variables that are unset,
-by using the following syntax: @code{$@{VAR:-default@}}.
-However, there are two ways a user can set @code{$}-prefixable variables:
-
-by defining them under a @code{[paths]} section, see example below,
-
-@example
-[paths]
-TALER_DEPLOYMENT_SHARED = $@{HOME@}/shared-data
-..
-[section-x]
-path-x = $@{TALER_DEPLOYMENT_SHARED@}/x
-@end example
-
-or by setting them in the environment:
-
-@example
-$ export VAR=/x
-@end example
-
-The configuration loader will give precedence to variables set under @code{[path]},
-though.
-
-The utility @code{taler-config}, which gets installed along with the exchange, serves
-to get and set configuration values without directly editing the @cite{.conf}.
-The option @code{-f} is particularly useful to resolve pathnames, when they use
-several levels of @code{$}-expanded variables. See @code{taler-config --help}.
-
-Note that, in this stage of development, the file @code{$HOME/.config/taler.conf}
-can contain sections for @emph{all} the component. For example, both an exchange and
-a bank can read values from it.
-
-The repository @code{git://taler.net/deployment} contains examples of configuration
-file used in our demos. See under @code{deployment/config}.
-
-@cartouche
-@quotation Note
-Expectably, some components will not work just by using default values, as their
-work is often interdependent. For example, a merchant needs to know an exchange
-URL, or a database name.
-@end quotation
-@end cartouche
-
diff --git a/doc/docstyle.css b/doc/docstyle.css
deleted file mode 100644
index c91d3f796..000000000
--- a/doc/docstyle.css
+++ /dev/null
@@ -1,76 +0,0 @@
-html, body {
-   font-size: 1em;
-   text-align: left;
-   text-decoration: none;
-}
-html { background-color: #e7e7e7; }
-
-body {
-   max-width: 74.92em;
-   margin: 0 auto;
-   padding: .5em 1em 1em 1em;
-   background-color: white;
-   border: .1em solid #c0c0c0;
-}
-
-h1, h2, h3, h4 { color: #333; }
-h5, h6, dt { color: #222; }
-
-
-a h3 {
-  color: #005090;
-}
-
-a[href] { color: #005090; }
-a[href]:visited { color: #100070; }
-a[href]:active, a[href]:hover {
-   color: #100070;
-   text-decoration: none;
-}
-
-.linkrow {
-  margin: 3em 0;
-}
-
-.linkrow {
-  text-align: center;
-}
-
-div.example { padding: .8em 1.2em .4em; }
-pre.example { padding: .8em 1.2em; }
-div.example, pre.example {
-   margin: 1em 0 1em 3% ;
-   -webkit-border-radius: .3em;
-   -moz-border-radius: .3em;
-   border-radius: .3em;
-   border: 1px solid #d4cbb6;
-   background-color: #f2efe4;
-}
-div.example > pre.example {
-   padding: 0 0 .4em;
-   margin: 0;
-   border: none;
-}
-
-
-/* This makes the very long tables of contents in Gnulib and other
-   manuals easier to read. */
-.contents ul, .shortcontents ul { font-weight: bold; }
-.contents ul ul, .shortcontents ul ul { font-weight: normal; }
-.contents ul { list-style: none; }
-
-/* For colored navigation bars (Emacs manual): make the bar extend
-   across the whole width of the page and give it a decent height. */
-.header, .node { margin: 0 -1em; padding: 0 1em; }
-.header p, .node p { line-height: 2em; }
-
-/* For navigation links */
-.node a, .header a { display: inline-block; line-height: 2em; }
-.node a:hover, .header a:hover { background: #f2efe4; }
-
-table.cartouche {
-  border-collapse: collapse;
-  border-color: darkred;
-  border-style: solid;
-  border-width: 3px;
-}
diff --git a/doc/exchange-db-generate.sh b/doc/exchange-db-generate.sh
deleted file mode 100755
index b296e0c9d..000000000
--- a/doc/exchange-db-generate.sh
+++ /dev/null
@@ -1,3 +0,0 @@
-#!/bin/sh
-taler-exchange-dbinit -r
-java -jar schemaSpy_5.0.0.jar -t pgsql -db taler -o taler -host localhost -dp /usr/share/java/postgresql-jdbc3-9.2.jar -u grothoff -p test -s public -hq
diff --git a/doc/exchange-db.png b/doc/exchange-db.png
deleted file mode 100644
index 421e5941b..000000000
--- a/doc/exchange-db.png
+++ /dev/null
diff --git a/doc/fdl-1.3.texi b/doc/fdl-1.3.texi
deleted file mode 100644
index 8805f1a47..000000000
--- a/doc/fdl-1.3.texi
+++ /dev/null
@@ -1,506 +0,0 @@
-@c The GNU Free Documentation License.
-@center Version 1.3, 3 November 2008
-
-@c This file is intended to be included within another document,
-@c hence no sectioning command or @node.
-
-@display
-Copyright @copyright{} 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc.
-@uref{http://fsf.org/}
-
-Everyone is permitted to copy and distribute verbatim copies
-of this license document, but changing it is not allowed.
-@end display
-
-@enumerate 0
-@item
-PREAMBLE
-
-The purpose of this License is to make a manual, textbook, or other
-functional and useful document @dfn{free} in the sense of freedom: to
-assure everyone the effective freedom to copy and redistribute it,
-with or without modifying it, either commercially or noncommercially.
-Secondarily, this License preserves for the author and publisher a way
-to get credit for their work, while not being considered responsible
-for modifications made by others.
-
-This License is a kind of ``copyleft'', which means that derivative
-works of the document must themselves be free in the same sense.  It
-complements the GNU General Public License, which is a copyleft
-license designed for free software.
-
-We have designed this License in order to use it for manuals for free
-software, because free software needs free documentation: a free
-program should come with manuals providing the same freedoms that the
-software does.  But this License is not limited to software manuals;
-it can be used for any textual work, regardless of subject matter or
-whether it is published as a printed book.  We recommend this License
-principally for works whose purpose is instruction or reference.
-
-@item
-APPLICABILITY AND DEFINITIONS
-
-This License applies to any manual or other work, in any medium, that
-contains a notice placed by the copyright holder saying it can be
-distributed under the terms of this License.  Such a notice grants a
-world-wide, royalty-free license, unlimited in duration, to use that
-work under the conditions stated herein.  The ``Document'', below,
-refers to any such manual or work.  Any member of the public is a
-licensee, and is addressed as ``you''.  You accept the license if you
-copy, modify or distribute the work in a way requiring permission
-under copyright law.
-
-A ``Modified Version'' of the Document means any work containing the
-Document or a portion of it, either copied verbatim, or with
-modifications and/or translated into another language.
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-A ``Secondary Section'' is a named appendix or a front-matter section
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-subject (or to related matters) and contains nothing that could fall
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-commercial, philosophical, ethical or political position regarding
-them.
-
-The ``Invariant Sections'' are certain Secondary Sections whose titles
-are designated, as being those of Invariant Sections, in the notice
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-section does not fit the above definition of Secondary then it is not
-allowed to be designated as Invariant.  The Document may contain zero
-Invariant Sections.  If the Document does not identify any Invariant
-Sections then there are none.
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-The ``Cover Texts'' are certain short passages of text that are listed,
-as Front-Cover Texts or Back-Cover Texts, in the notice that says that
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-be at most 5 words, and a Back-Cover Text may be at most 25 words.
-
-A ``Transparent'' copy of the Document means a machine-readable copy,
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-straightforwardly with generic text editors or (for images composed of
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-for automatic translation to a variety of formats suitable for input
-to text formatters.  A copy made in an otherwise Transparent file
-format whose markup, or absence of markup, has been arranged to thwart
-or discourage subsequent modification by readers is not Transparent.
-An image format is not Transparent if used for any substantial amount
-of text.  A copy that is not ``Transparent'' is called ``Opaque''.
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-Examples of suitable formats for Transparent copies include plain
-@sc{ascii} without markup, Texinfo input format, La@TeX{} input
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-of transparent image formats include @acronym{PNG}, @acronym{XCF} and
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-output purposes only.
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-The ``Title Page'' means, for a printed book, the title page itself,
-plus such following pages as are needed to hold, legibly, the material
-this License requires to appear in the title page.  For works in
-formats which do not have any title page as such, ``Title Page'' means
-the text near the most prominent appearance of the work's title,
-preceding the beginning of the body of the text.
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-The ``publisher'' means any person or entity that distributes copies
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-A section ``Entitled XYZ'' means a named subunit of the Document whose
-title either is precisely XYZ or contains XYZ in parentheses following
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-section ``Entitled XYZ'' according to this definition.
-
-The Document may include Warranty Disclaimers next to the notice which
-states that this License applies to the Document.  These Warranty
-Disclaimers are considered to be included by reference in this
-License, but only as regards disclaiming warranties: any other
-implication that these Warranty Disclaimers may have is void and has
-no effect on the meaning of this License.
-
-@item
-VERBATIM COPYING
-
-You may copy and distribute the Document in any medium, either
-commercially or noncommercially, provided that this License, the
-copyright notices, and the license notice saying this License applies
-to the Document are reproduced in all copies, and that you add no other
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-
-You may also lend copies, under the same conditions stated above, and
-you may publicly display copies.
-
-@item
-COPYING IN QUANTITY
-
-If you publish printed copies (or copies in media that commonly have
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-copies in covers that carry, clearly and legibly, all these Cover
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-
-If the required texts for either cover are too voluminous to fit
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-
-If you publish or distribute Opaque copies of the Document numbering
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-copy along with each Opaque copy, or state in or with each Opaque copy
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-
-It is requested, but not required, that you contact the authors of the
-Document well before redistributing any large number of copies, to give
-them a chance to provide you with an updated version of the Document.
-
-@item
-MODIFICATIONS
-
-You may copy and distribute a Modified Version of the Document under
-the conditions of sections 2 and 3 above, provided that you release
-the Modified Version under precisely this License, with the Modified
-Version filling the role of the Document, thus licensing distribution
-and modification of the Modified Version to whoever possesses a copy
-of it.  In addition, you must do these things in the Modified Version:
-
-@enumerate A
-@item
-Use in the Title Page (and on the covers, if any) a title distinct
-from that of the Document, and from those of previous versions
-(which should, if there were any, be listed in the History section
-of the Document).  You may use the same title as a previous version
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-
-@item
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-responsible for authorship of the modifications in the Modified
-Version, together with at least five of the principal authors of the
-Document (all of its principal authors, if it has fewer than five),
-unless they release you from this requirement.
-
-@item
-State on the Title page the name of the publisher of the
-Modified Version, as the publisher.
-
-@item
-Preserve all the copyright notices of the Document.
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-@item
-Add an appropriate copyright notice for your modifications
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-@item
-Include, immediately after the copyright notices, a license notice
-giving the public permission to use the Modified Version under the
-terms of this License, in the form shown in the Addendum below.
-
-@item
-Preserve in that license notice the full lists of Invariant Sections
-and required Cover Texts given in the Document's license notice.
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-@item
-Include an unaltered copy of this License.
-
-@item
-Preserve the section Entitled ``History'', Preserve its Title, and add
-to it an item stating at least the title, year, new authors, and
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-
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-The author(s) and publisher(s) of the Document do not by this License
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-COLLECTIONS OF DOCUMENTS
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-To use this License in a document you have written, include a copy of
-the License in the document and put the following copyright and
-license notices just after the title page:
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-@smallexample
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-  Permission is granted to copy, distribute and/or modify this document
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-  or any later version published by the Free Software Foundation;
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-  Texts.  A copy of the license is included in the section entitled ``GNU
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diff --git a/doc/syntax.texi b/doc/syntax.texi
deleted file mode 100644
index 8aca39d8d..000000000
--- a/doc/syntax.texi
+++ /dev/null
@@ -1,44 +0,0 @@
-@c Syntax highlighting for texinfo's HTML output
-
-@html
-<script src="highlight.pack.js"></script>
-<script>
-var hls = [];
-var syntaxAuto = true;
-addEventListener("DOMContentLoaded", function() {
-  // Highlight blocks with fixed language
-  for (let x of hls) {
-    let next = x[0].nextElementSibling;
-    console.log("next", next);
-    let blocks = next.querySelectorAll("pre.example");
-    for (let i = 0; i < blocks.length; i++) {
-      blocks[i].classList.add("language-" + x[1]);
-      hljs.highlightBlock(blocks[i]);
-    }
-  } 
-  // auto-detect other blocks if not disabled
-  if (syntaxAuto) {
-    let blocks = document.querySelectorAll("pre.example");
-    for (let i = 0; i < blocks.length; i++) {
-      hljs.highlightBlock(blocks[i]);
-    }
-  }
-});
-</script>
-@end html
-
-@macro setsyntax{lang}
-@html
-<script>
-hls.push([document.currentScript, "\lang\"]);
-</script>
-@end html
-@end macro
-
-@macro setsyntaxnoauto{}
-@html
-<script>
-syntaxAuto = false;
-</script>
-@end html
-@end macro
diff --git a/doc/taler-config.texi b/doc/taler-config.texi
deleted file mode 100644
index efca5a2d7..000000000
--- a/doc/taler-config.texi
+++ /dev/null
@@ -1,47 +0,0 @@
-@c This file is used both in the exchange and merchant
-@c manuals. Edits should be propagated to both Gits!
-
-@node Using taler-config
-@section Using taler-config
-@cindex taler-config
-
-The tool @code{taler-config} can be used to
-extract or manipulate configuration values; however, the configuration
-use the well-known INI file format and can also be edited by hand.
-
-Run
-@example
-$ taler-config -s $SECTION
-@end example
-to list all of the configuration values in section @code{$SECTION}.
-
-Run
-@example
-$ taler-config -s $section -o $option
-@end example
-to extract the respective configuration value for option @code{$option}
-in section @code{$section}.
-
-Finally, to change a setting, run
-@example
-$ taler-config -s $section -o $option -V $value
-@end example
-to set the respective configuration value to @code{$value}. Note that you have to
-manually restart the Taler backend after you change the configuration to
-make the new configuration go into effect.
-
-Some default options will use $-variables, such as @code{$DATADIR}
-within their value.  To expand the @code{$DATADIR} or other $-variables
-in the configuration, pass the @code{-f} option to
-@code{taler-config}.  For example, compare:
-@example
-$ taler-config -s ACCOUNT-bank \
-               -o WIRE_RESPONSE
-$ taler-config -f -s ACCOUNT-bank \
-               -o WIRE_RESPONSE
-@end example
-
-While the configuration file is typically located at
-@code{$HOME/.config/taler.conf}, an alternative location can be
-specified to @code{taler-merchant-httpd} and @code{taler-config} using
-the @code{-c} option.
diff --git a/doc/taler-exchange.texi b/doc/taler-exchange.texi
deleted file mode 100644
index 209e2dd5b..000000000
--- a/doc/taler-exchange.texi
+++ /dev/null
@@ -1,972 +0,0 @@
-\input texinfo   @c -*-texinfo-*-
-@setfilename taler-exchange.info
-@documentencoding UTF-8
-@include version.texi
-@settitle The GNU Taler Exchange Operator Manual
-@paragraphindent 0
-@exampleindent 4
-
-@include syntax.texi
-
-@copying
-This manual is for the GNU Taler Exchange
-(version @value{VERSION}, @value{UPDATED}),
-a payment service provider for GNU Taler.
-
-Copyright @copyright{} 2014-2018 Taler Systems SA
-
-@quotation
-Permission is granted to copy, distribute and/or modify this document
-under the terms of the GNU Free Documentation License, Version 1.3
-or any later version published by the Free Software Foundation;
-with no Invariant Sections, no Front-Cover Texts, and no Back-Cover
-Texts.  A copy of the license is included in the section entitled "GNU
-Free Documentation License".
-@end quotation
-@end copying
-
-@dircategory Network applications
-@direntry
-* GNU Taler Exchange: (taler-exchange).       Electronic payment system.
-@end direntry
-
-
-@titlepage
-@title The GNU Taler Exchange Operator Manual
-@subtitle Version @value{VERSION}
-@subtitle @value{UPDATED}
-@author Christian Grothoff (@email{grothoff@@taler.net})
-@author Marcello Stanisci (@email{stanisci@@taler.net})
-@page
-@vskip 0pt plus 1filll
-@insertcopying
-@end titlepage
-
-@summarycontents
-@contents
-
-@ifnottex
-@node Top
-@top The GNU Taler Exchange Operator Manual
-@insertcopying
-@end ifnottex
-
-
-@menu
-* Introduction::
-* Installation::
-* Configuration::
-* Deployment::
-* Diagnostics::
-
-
-
-Appendices
-
-* GNU-AGPL::                    The GNU Affero General Public License says how you
-                                can copy and share the code of the `GNU Taler Exchange'.
-* GNU-FDL::                     The GNU Free Documentation License says how you
-                                can copy and share the documentation of `GNU Taler'.
-
-Indices
-
-* Concept Index::               Index of concepts and programs.
-@end menu
-
-@node Introduction
-@chapter Introduction
-
-This manual is an early draft that still needs significant editing
-work to become readable.
-
-
-@section About GNU Taler
-
-GNU Taler is an open protocol for an electronic payment system with a
-free software reference implementation.  GNU Taler offers secure, fast
-and easy payment processing using well understood cryptographic
-techniques.  GNU Taler allows customers to remain anonymous, while
-ensuring that merchants can be held accountable by governments.
-Hence, GNU Taler is compatible with anti-money-laundering (AML) and
-know-your-customer (KYC) regulation, as well as data protection
-regulation (such as GDPR).
-
-GNU Taler is not yet production-ready, after following this manual
-you will have a backend that can process payments in ``KUDOS'', but
-not regular currencies.  This is not so much because of limitations
-in the backend, but because we are not aware of a Taler exchange
-operator offering regular currencies today.
-
-@section About this manual
-
-This tutorial targets system administrators who want to install and
-operate a GNU Taler exchange.
-
-@section Organizational prerequisites
-
-Operating a GNU Taler exchange means that you are operating a payment
-service provider, which means that you will most likely need a bank
-license and/or follow applicable financial regulation.
-
-@cindex availability
-@cindex backup
-@cindex replication
-GNU Taler payment service providers generally need to ensure high
-availability and have @emph{really} good backups (synchronous
-replication, asynchronous remote replication, off-site backup, 24/7
-monitoring, etc.).@footnote{Naturally, you could operate a Taler
-exchange for a toy currency without any real value on low-cost setups
-like a Raspberry Pi, but we urge you to limit the use of such setups
-to research and education as with GNU Taler data loss instantly
-results in financial losses.}  This manual will not cover these
-aspects of operating a payment service provider.
-
-@cindex HSM
-@cindex offline
-@cindex database
-@cindex operational security
-We will assume that you can operate a (high-availability,
-high-assurance) Postgres database.  Furthermore, we expect some
-moderate familiarity with the compilation and installation of free
-software packages.  You need to understand the cryptographic concepts
-of private and public keys and must be able to protect private keys
-stored in files on disk.  An exchange uses an @emph{offline} master
-key as well as @emph{online} keys.  You are advised to secure your
-private master key and any copies on encrypted, always-offline
-computers.  Again, we assume that you are familiar with good best
-practices in operational security, including securing key
-material.@footnote{The current implementation does not make provisions
-for secret splitting.  Still, the use of a hardware security module
-(HSM) for protecting private keys is adviseable, so please contact the
-developers for HSM integration support.}
-
-
-@section Architecture overview
-
-@cindex crypto-currency
-@cindex bank
-@cindex escrow
-@cindex coin
-Taler is a pure payment system, not a new crypto-currency. As such, it
-operates in a traditional banking context.  In particular, this means
-that in order to receive funds via Taler, the merchant must have a
-regular bank account, and payments can be executed in ordinary
-currencies such as USD or EUR.  Similarly, the Taler exchange must
-interact with a bank.  The bank of the exchange holds the exchange's
-funds in an escrow account.
-
-@cindex reserve
-@cindex fee
-@cindex aggregator
-@cindex deposit
-When customers wire money to the escrow account, the bank notifies
-the exchange about the incoming wire transfers.  The exchange then
-creates a @emph{reserve} based on the subject of the wire transfer.
-The wallet which knows the secret key matching the wire transfer
-subject can then withdraw coins from the reserve, thereby draining
-it.  The liability of the exchange against the reserve is thereby
-converted into a liability against digital coins issued by the
-exchange.  When the customer later spends the coins at a merchant,
-and the merchant @emph{deposits} the coins at the exchange, the
-exchange first @emph{aggregates} the amount from multiple deposits
-from the same merchant and then instructs its bank to make a
-wire transfer to the merchant, thereby fulfilling its obligation
-and eliminating the liability.  The exchange charges @emph{fees}
-for some or all of its operations to cover costs and possibly make
-a profit.
-
-@cindex auditor
-@cindex accounting
-@emph{Auditors} are third parties, for example financial regulators,
-that verify that the exchange operates correctly.  The same software
-is also used to calculate the exchange's profits, risk and liabilities
-by the accountants of the exchange.
-
-The Taler software stack for an exchange consists of the
-following components:
-
-@itemize
-@cindex HTTP frontend
-@item The HTTP frontend interacts with Taler wallets and
-  merchant backends.  It is used to withdraw coins, deposit
-  coins, refresh coins, issue refunds, map wire transfers to
-  Taler transactions, inquire about the exchange's bank account
-  details, signing keys and fee structure.
-  The binary is the @code{taler-exchange-httpd}.
-@cindex Aggregator
-@item The aggregator combines multiple deposits made by
-  the same merchant and (eventually) triggers wire transfers for the
-  aggregate amount.  The merchant can control how quickly wire
-  transfers are made. The exchange may be charge a fee per wire transfer
-  to discourage excessively frequent transfers.  The binary
-  is the @code{taler-exchange-aggregator}.
-@cindex Auditor
-@item The auditor verifies that the transactions performed by
-  the exchange were done properly. It checks the various signatures,
-  totals up the amounts and alerts the operator to any inconsistencies.
-  It also computes the expected bank balance, revenue and risk exposure
-  of the exchange operator.  The main binary is the
-  @code{taler-auditor}.
-@cindex Wire plugin
-@item A wire plugin enables the HTTP frontend to talk to the
-  bank. Its role is to allow the exchange to validate bank
-  addresses (i.e. IBAN numbers), for the aggregator to execute
-  wire transfers and for the auditor to query bank transaction
-  histories.  Wire plugins are @emph{plugins} as there can be
-  many different implementations to deal with different
-  banking standards.  Wire plugins are automatically located
-  and used by the exchange, aggregator and auditor.
-@cindex DBMS
-@cindex Postgres
-@item The exchange requires a DBMS to stores the transaction history for
-  the Taler exchange and aggregator, and a (typically separate) DBMS for
-  the Taler auditor.
-  For now, the GNU Taler reference implemenation only supports Postgres,
-  but the code could be easily extended to support another DBMS.
-@end itemize
-
-@c The following image illustrates the various interactions of these
-@c key components:
-
-@c @center @image{arch, 3in, 4in}
-
-
-@node Installation
-@chapter Installation
-
-Please install the following packages before proceeding with the exchange compilation.
-
-@itemize
-
-@item
-GNU autoconf >= 2.69
-
-@item
-GNU automake >= 1.14
-
-@item
-GNU libtool >= 2.4
-
-@item
-GNU autopoint >= 0.19
-
-@item
-GNU libltdl >= 2.4
-
-@item
-GNU libunistring >= 0.9.3
-
-@item
-libcurl >= 7.26 (or libgnurl >= 7.26)
-
-@item
-GNU libmicrohttpd >= 0.9.59
-
-@item
-GNU libgcrypt >= 1.6
-
-@item
-libjansson >= 2.7
-
-@item
-Postgres >= 9.6, including libpq
-
-@item
-libgnunetutil (from Git)
-
-@item
-GNU Taler exchange (from Git)
-@end itemize
-
-Except for the last two, these are available in most GNU/Linux
-distributions and should just be installed using the respective
-package manager.
-
-The following instructions will show how to install libgnunetutil and
-the GNU Taler exchange.
-
-Before you install libgnunetutil, you must download and install the
-dependencies mentioned above, otherwise the build may succeed but fail
-to export some of the tooling required by Taler.
-
-To download and install libgnunetutil, proceed as follows:
-
-@example
-$ git clone https://git.gnunet.org/gnunet/
-$ cd gnunet/
-$ ./bootstrap
-$ ./configure [--prefix=GNUNETPFX]
-$ # Each dependency can be fetched from non standard locations via
-$ # the '--with-<LIBNAME>' option. See './configure --help'.
-$ make
-# make install
-@end example
-
-If you did not specify a prefix, GNUnet will install to
-@code{/usr/local}, which requires you to run the last step as
-@code{root}.
-
-To download and install the GNU Taler exchange, proceeds as follows:
-
-@setsyntax shell
-@example
-$ git clone git://git.taler.net/exchange
-$ cd exchange
-$ ./bootstrap
-$ ./configure [--prefix=EXCHANGEPFX] \
-              [--with-gnunet=GNUNETPFX]
-$ # Each dependency can be fetched from non standard locations via
-$ # the '--with-<LIBNAME>' option. See './configure --help'.
-$ make
-# make install
-@end example
-
-If you did not specify a prefix, the exchange will install to
-@code{/usr/local}, which requires you to run the last step as
-@code{root}.  Note that you have to specify @code{--with-gnunet=/usr/local}
-if you installed GNUnet to @code{/usr/local} in the previous step.
-
-
-
-
-@node Configuration
-@chapter Configuration
-
-@c In this document, we assume that @code{$HOME/.config/taler.conf} is being customized.
-
-This chapter provides an overview of the exchange configuration.  Or
-at least eventually will do so, for now it is a somewhat wild
-description of some of the options.
-
-@menu
-* Configuration format::
-* Using taler-config::
-* Keying::
-* Serving::
-* Currency::
-* Bank account::
-* Database::
-* Coins (denomination keys): Coins denomination keys.
-* Keys duration::
-
-@end menu
-
-@include configuration-format.texi
-@include taler-config.texi
-
-
-
-
-@node Keying
-@section Keying
-
-The exchange works with three types of keys:
-
-@c FIXME: explain better!
-
-@itemize
-
-@item
-@cite{master key}
-
-@item
-@cite{sign keys}
-
-@item
-@cite{denomination keys} (see section @cite{Coins})
-@end itemize
-
-@c FIXME: text here.
-
-@itemize
-@item
-@cite{MASTER_PRIV_FILE}: Path to the exchange's master private file.
-
-@item
-@cite{MASTER_PUBLIC_KEY}: Must specify the exchange's master public key.
-@end itemize
-
-
-
-
-
-@node Serving
-@section Serving
-
-
-The exchange can serve HTTP over both TCP and UNIX domain socket.
-
-The following values are to be configured in the section
-@cite{[exchange]}:
-
-
-@itemize
-
-@item
-@cite{serve}: must be set to @cite{tcp} to serve HTTP over TCP, or
-@cite{unix} to serve HTTP over a UNIX domain socket
-
-@item
-@cite{port}: Set to the TCP port to listen on if @cite{serve} Is
-@cite{tcp}.
-
-@item
-@cite{unixpath}: set to the UNIX domain socket path to listen on if
-@cite{serve} Is @cite{unix}
-
-@item
-@cite{unixpath_mode}: number giving the mode with the access
-permission MASK for the @cite{unixpath} (i.e. 660 = rw-rw----).
-@end itemize
-
-
-@node Currency
-@section Currency
-
-
-The exchange supports only one currency. This data is set under the respective
-option @cite{currency} in section @cite{[taler]}.
-
-@node Bank account
-@section Bank account
-
-To configure a bank account in Taler, we need to furnish four
-pieces of information:
-@itemize
-@item
-  The @code{payto://} URL of the bank account, which uniquely idenfies
-  the account. Examples for such URLs include
-  @code{payto://sepa/CH9300762011623852957} for a bank account
-  in the single European payment area (SEPA) or
-  @code{payto://x-taler-bank/localhost:8080/2} for the 2nd bank
-  account a the Taler bank demonstrator running at @code{localhost}
-  on port 8080.  The first part of the URL following @code{payto://}
-  (``sepa'' or ``x-taler-bank'') is called the wire method.
-@item
-  A matching wire plugin that implements a protocol to interact
-  with the banking system.  For example, the EBICS plugin can
-  be used for SEPA transfers, or the ``taler-bank'' plugin can
-  interact with the Taler bank demonstrator.  A wire plugin
-  only supports one particular wire method. Thus, you must make
-  sure to pick a plugin that supports the wire method used in the
-  URL.
-@item
-  A file containing the signed JSON-encoded bank account details
-  for the /wire API.  This is necessary as Taler supports offline
-  signing for bank accounts for additional security.
-@item
-  Finally, the plugin needs to be provided resources for
-  authentication to the respective banking service.  The format
-  in which the authentication information must be provided
-  depends on the wire plugin.
-@end itemize
-
-You can configure multiple accounts for an exchange by creating
-sections starting with ``account-'' for the section name.  You can
-ENABLE for each account whether it should be used, and for what
-(incoming or outgoing wire transfers):
-
-@setsyntax ini
-@example
-
-[account-1]
-URL = "payto://sepa/CH9300762011623852957"
-WIRE_RESPONSE = $@{TALER_CONFIG_HOME@}/account-1.json
-
-# Currently, only the 'taler_bank' plugin is implemented.
-PLUGIN = <plugin_name_here>
-
-# Use for exchange-aggregator (outgoing transfers)
-ENABLE_DEBIT = YES
-# Use for exchange-wirewatch (and listed in /wire)
-ENABLE_CREDIT = YES
-
-# Authentication options for the chosen plugin go here.
-# (Next sections have examples of authentication mechanisms)
-@end example
-
-The command line tool @cite{taler-exchange-wire} is used to create
-the @code{account-1.json} file.
-For example, the utility may be invoked as follows to create
-all of the WIRE_RESPONSE files (in the locations specified by the configuration):
-
-@example
-$ taler-exchange-wire
-@end example
-
-The generated file will be echoed by the exchange when serving
-/wire@footnote{https://api.taler.net/api-exchange.html#wire-req}
-requests.
-
-
-@menu
-* Wire plugin ``taler_bank''::
-* Wire plugin ``ebics''::
-* Wire fee structure::
-@end menu
-
-@node Wire plugin ``taler_bank''
-@subsection Wire plugin ``taler_bank''
-@cindex x-taler-bank
-@cindex taler_bank plugin
-
-The @code{taler_bank} plugin implements the wire method ``x-taler-bank''.
-
-The format of the @code{payto://} URL is @code{payto://x-taler-bank/HOSTNAME[:PORT]}.
-
-For basic authentication, the @code{taler_bank} plugin only supports
-simple password-based authentication.  For this, the configuration
-must contain the ``USERNAME'' and ``PASSWORD'' of the respective
-account at the bank.
-
-@setsyntax ini
-@example
-[account-1]
-
-# Bank account details here..
-# ..
-
-# Authentication options for the taler_bank plugin below:
-
-TALER_BANK_AUTH_METHOD = basic
-USERNAME = exchange
-PASSWORD = super-secure
-@end example
-
-
-@node Wire plugin ``ebics''
-@subsection Wire plugin ``ebics''
-
-The ``ebics'' wire plugin is not fully implemented and today
-does not support actual wire transfers.
-
-
-@cartouche
-@quotation Note
-The rationale behind having multiple bank accounts is that the exchange operator, as a security
-measure, may want to instruct the bank that the incoming bank account is only supposed to
-@emph{receive} money.
-@end quotation
-@end cartouche
-
-
-@node Wire fee structure
-@subsection Wire fee structure
-@cindex wire fee
-@cindex fee
-
-For each wire method (``sepa'' or ``x-taler-wire'', but not per plugin!) the
-exchange configuration must specify applicable wire fees.  This is done
-in configuration sections of the format @code{fees-METHOD}.  There are two
-types of fees, simple wire fees and closing fees.  Wire fees apply whenever
-the aggregator transfers funds to a merchant.  Closing fees apply whenever
-the exchange closes a reserve (sending back funds to the customer).  The
-fees must be constant for a full year, which is specified as part of the name
-of the option.
-
-@setsyntax ini
-@example
-[fees-iban]
-WIRE-FEE-2018 = EUR:0.01
-WIRE-FEE-2019 = EUR:0.01
-CLOSING-FEE-2018 = EUR:0.01
-CLOSING-FEE-2019 = EUR:0.01
-
-[fees-x-taler-bank]
-WIRE-FEE-2018 = KUDOS:0.01
-WIRE-FEE-2019 = KUDOS:0.01
-CLOSING-FEE-2018 = KUDOS:0.01
-CLOSING-FEE-2019 = KUDOS:0.01
-@end example
-
-
-@node Database
-@section Database
-
-
-The option @cite{db} under section @cite{[exchange]} gets the DB backend's name the exchange
-is going to use. So far, only @cite{db = postgres} is supported. After choosing the backend,
-it is mandatory to supply the connection string (namely, the database name). This is
-possible in two ways:
-
-
-@itemize
-
-@item
-via an environment variable: @cite{TALER_EXCHANGEDB_POSTGRES_CONFIG}.
-
-@item
-via configuration option @cite{CONFIG}, under section @cite{[exchangedb-BACKEND]}. For example, the demo exchange is configured as follows:
-@end itemize
-
-@setsyntax ini
-@example
-[exchange]
-...
-DB = postgres
-...
-
-[exchangedb-postgres]
-CONFIG = postgres:///talerdemo
-@end example
-
-@node Coins denomination keys
-@section Coins (denomination keys)
-
-
-Sections specifying denomination (coin) information start with
-"coin_".  By convention, the name continues with
-"$CURRENCY_[$SUBUNIT]_$VALUE", i.e. @cite{[coin_eur_ct_10]} for a 10
-cent piece.  However, only the "coin_" prefix is mandatory.  Each
-"coin_"-section must then have the following options:
-
-
-@itemize
-
-@item
-@cite{value}: How much is the coin worth, the format is
-CURRENCY:VALUE.FRACTION.  For example, a 10 cent piece is "EUR:0.10".
-
-@item
-@cite{duration_withdraw}: How long can a coin of this type be
-withdrawn?  This limits the losses incurred by the exchange when a
-denomination key is compromised.
-
-@item
-@cite{duration_overlap}: What is the overlap of the withdrawal
-timespan for this coin type?
-
-@item
-@cite{duration_spend}: How long is a coin of the given type valid?
-Smaller values result in lower storage costs for the exchange.
-
-@item
-@cite{fee_withdraw}: What does it cost to withdraw this coin?
-Specified using the same format as @cite{value}.
-
-@item
-@cite{fee_deposit}: What does it cost to deposit this coin? Specified
-using the same format as @cite{value}.
-
-@item
-@cite{fee_refresh}: What does it cost to refresh this coin? Specified
-using the same format as @cite{value}.
-
-@item
-@cite{rsa_keysize}: How many bits should the RSA modulus (product of
-the two primes) have for this type of coin.
-@end itemize
-
-
-@node Keys duration
-@section Keys duration
-
-
-Both @cite{signkeys} and @cite{denom keys} have a starting date. The
-option @cite{lookahead_provide}, under section @cite{[exchange]},
-is such that only keys whose starting date is younger than
-@cite{lookahead_provide} will be issued by the exchange.
-
-@cite{signkeys}. The option @cite{lookahead_sign} is such that, being
-@cite{t} the time when @cite{taler-exchange-keyup} is run,
-@cite{taler-exchange-keyup} will generate @cite{n} @cite{signkeys},
-where @cite{t + (n * signkey_duration) = t + lookahead_sign}. In other
-words, we generate a number of keys which is sufficient to cover a
-period of @cite{lookahead_sign}. As for the starting date, the first
-generated key will get a starting time of @cite{t}, and the
-@cite{j}-th key will get a starting time of @cite{x +
-signkey_duration}, where @cite{x} is the starting time of the
-@cite{(j-1)}-th key.
-
-@cite{denom keys}. The option @cite{lookahead_sign} is such that,
-being @cite{t} the time when @cite{taler-exchange-keyup} is run,
-@cite{taler-exchange-keyup} will generate @cite{n} @cite{denom keys}
-for each denomination, where @cite{t + (n * duration_withdraw) = t +
-lookahead_sign}. In other words, for each denomination, we generate a
-number of keys which is sufficient to cover a period of
-@cite{lookahead_sign}. As for the starting date, the first generated
-key will get a starting time of @cite{t}, and the @cite{j}-th key will
-get a starting time of @cite{x + duration_withdraw}, where @cite{x} is
-the starting time of the @cite{(j-1)}-th key.
-
-To change these settings, edit the following
-values in section @cite{[exchange]}:
-
-@itemize
-@item
-@cite{SIGNKEY_DURATION}: How long should one signing key be used?
-
-@item
-@cite{LOOKAHEAD_SIGN}: How much time we want to cover with our
-signing keys? Note that if @cite{SIGNKEY_DURATION} is bigger than
-@cite{LOOKAHEAD_SIGN}, @code{taler-exchange-keyup} will generate a
-quantity of signing keys which is sufficient to cover all the
-gap.
-@end itemize
-
-@c FIXME: LEGAL_DURATION not covered!
-@c FIXME: LOOKAHEAD_PROVIDE not covered!
-
-
-@node Deployment
-@chapter Deployment
-
-
-@menu
-* Keys generation::
-* Database upgrades::
-@end menu
-
-@node Keys generation
-@section Keys generation
-
-Once the configuration is properly set up, all the keys can be generated
-by the tool @code{taler-exchange-keyup}.  The following command generates denomkeys
-and signkeys, plus the "blob" that is to be signed by the auditor.
-
-@example
-taler-exchange-keyup -o blob
-@end example
-
-@emph{blob} contains data about denomkeys that the exchange operator needs to
-get signed by every auditor he wishes (or is forced to) work with.
-
-In a normal scenario, an auditor must have some way of receiving the blob to
-sign (Website, manual delivery, ..).  Nonetheless, the exchange admin can fake
-an auditor signature --- for testing purposes --- by running the following command
-
-@example
-taler-auditor-sign -m EXCHANGE_MASTER_PUB -r BLOB -u AUDITOR_URL -o OUTPUT_FILE
-@end example
-
-Those arguments are all mandatory.
-
-@itemize
-@item @code{EXCHANGE_MASTER_PUB} the base32 Crockford-encoded exchange's master
-public key.  Tipically, this value lies in the configuration option
-@code{[exchange]/master_public_key}.
-@item @code{BLOB} the blob generated in the previous step.
-@item @code{AUDITOR_URL} the URL that identifies the auditor.
-@item @code{OUTPUT_FILE} where on the disk the signed blob is to be saved.
-@end itemize
-
-@code{OUTPUT_FILE} must then be copied into the directory specified
-by the option @code{AUDITOR_BASE_DIR} under the section @code{[exchangedb]}.
-Assuming @code{AUDITOR_BASE_DIR = $@{HOME@}/.local/share/taler/auditors}, the
-following command will "add" the auditor identified by @code{AUDITOR_URL} to
-the exchange.
-
-@example
-cp OUTPUT_FILE $@{HOME@}/.local/share/taler/auditors
-@end example
-
-If the auditor has been correctly added, the exchange's @code{/keys} response
-must contain an entry in the @code{auditors} array mentioning the auditor's URL.
-
-
-@c FIXME: reference section about where keys are stored.
-
-@node Database upgrades
-@section Database upgrades
-
-Currently, there is no way to upgrade the database between Taler versions.
-
-The exchange database can be re-initialized using:
-
-@example
-$ taler-exchange-dbinit -r
-@end example
-
-However, running this command will result in all data in the database
-being lost, which may result in significant financial liabilities as
-the exchange can then not detect double-spending.  Hence this
-operation must not be performed in a production system.
-
-@node Diagnostics
-@chapter Diagnostics
-
-This chapter includes various (very unpolished) sections on specific topics
-that might be helpful to understand how the exchange operates, which files
-should be backed up.  The information may also be helpful for diagnostics.
-
-@menu
-* Reserve management::
-* Database Scheme::
-* Signing key storage::
-* Denomination key storage::
-* Auditor signature storage::
-@end menu
-
-
-@node Reserve management
-@section Reserve management
-
-
-Incoming transactions to the exchange's provider result in the
-creation or update of reserves, identified by their reserve key.  The
-command line tool @cite{taler-exchange-reservemod} allows create and
-add money to reserves in the exchange's database.
-
-
-
-
-@node Database Scheme
-@section Database Scheme
-
-
-The exchange database must be initialized using @cite{taler-exchange-dbinit}.  This
-tool creates the tables required by the Taler exchange to operate.  The
-tool also allows you to reset the Taler exchange database, which is useful
-for test cases but should never be used in production.  Finally,
-@cite{taler-exchange-dbinit} has a function to garbage collect a database,
-allowing administrators to purge records that are no longer required.
-
-The database scheme used by the exchange look as follows:
-
-@image{exchange-db,5in,,,png}
-
-
-@node Signing key storage
-@section Signing key storage
-
-
-The private online signing keys of the exchange are stored in a
-subdirectory "signkeys/" of the "KEYDIR" which is an option in the
-"[exchange]" section of the configuration file.  The filename is the
-starting time at which the signing key can be used in microseconds
-since the Epoch.  The file format is defined by the @cite{struct TALER_EXCHANGEDB_PrivateSigningKeyInformationP}:
-
-@example
-struct TALER_EXCHANGEDB_PrivateSigningKeyInformationP @{
-   struct TALER_ExchangePrivateKeyP signkey_priv;
-   struct TALER_ExchangeSigningKeyValidityPS issue;
-@};
-@end example
-
-
-@node Denomination key storage
-@section Denomination key storage
-
-The private denomination keys of the exchange are store in a
-subdirectory "denomkeys/" of the "KEYDIR" which is an option in the
-"[exchange]" section of the configuration file.  "denomkeys/" contains
-further subdirectories, one per denomination.  The specific name of
-the subdirectory under "denomkeys/" is ignored by the exchange.
-However, the name is important for the "taler-exchange-keyup" tool
-that generates the keys.  The tool combines a human-readable encoding
-of the denomination (i.e.  for EUR:1.50 the prefix would be
-"EUR_1_5-", or for EUR:0.01 the name would be "EUR_0_01-") with a
-postfix that is a truncated Crockford32 encoded hash of the various
-attributes of the denomination key (relative validity periods, fee
-structure and key size).  Thus, if any attributes of a coin change,
-the name of the subdirectory will also change, even if the
-denomination remains the same.
-
-Within this subdirectory, each file represents a particular
-denomination key.  The filename is the starting time at which the
-signing key can be used in microseconds since the Epoch.  The
-format on disk begins with a
-@cite{struct TALER_EXCHANGEDB_DenominationKeyInformationP} giving
-the attributes of the denomination key and the associated
-signature with the exchange's long-term offline key:
-
-@example
-struct TALER_EXCHANGEDB_DenominationKeyInformationP @{
-  struct TALER_MasterSignatureP signature;
-  struct TALER_DenominationKeyValidityPS properties;
-@};
-@end example
-
-This is then followed by the variable-size RSA private key in
-libgcrypt's S-expression format, which can be decoded using
-@cite{GNUNET_CRYPTO_rsa_private_key_decode()}.
-
-@menu
-* Revocations::
-@end menu
-
-@node Revocations
-@subsection Revocations
-
-@cindex payback
-@cindex revocation
-When an exchange goes out of business or detects that the private
-key of a denomination key pair has been compromised, it may revoke
-some or all of its denomination keys.  At this point, the hashes
-of the revoked keys must be returned as part of the @code{/keys} response
-under ``payback''.  Wallets detect this, and then return unspent
-coins of the respective denomination key using the @code{/payback}
-API.
-
-When a denomination key is revoked, a revocation file is placed
-into the respective subdirectory of ``denomkeys/''.  The file has the
-same prefix as the file that stores the
-@cite{struct TALER_EXCHANGEDB_DenominationKeyInformationP} information,
-but is followed by the ``.rev'' suffix.  It contains a 64-byte
-EdDSA signature made with the master key of the exchange with purpose
-@code{TALER_SIGNATURE_MASTER_DENOMINATION_KEY_REVOKED}.  If such a file
-is present, the exchange must check the signature and if it is valid
-treat the respective denomination key as revoked.
-
-Revocation files can be generated using the
-@code{taler-exchange-keyup} command-line tool using the @code{-r}
-option.  The Taler auditor will instruct operators to generate
-revocations if it detects a key compromise (which is possible more
-coins of a particular denomination were deposited than issued).
-
-It should be noted that denomination key revocations should only happen
-under highly unusual (``emergency'') conditions and not under normal
-conditions.
-
-
-@node Auditor signature storage
-@section Auditor signature storage
-
-
-Signatures from auditors are stored in the directory specified
-in the exchange configuration section "exchangedb" under the
-option "AUDITOR_BASE_DIR".  The exchange does not care about
-the specific names of the files in this directory.
-
-Each file must contain a header with the public key information
-of the auditor, the master public key of the exchange, and
-the number of signed denomination keys:
-
-@example
-struct AuditorFileHeaderP @{
-  struct TALER_AuditorPublicKeyP apub;
-  struct TALER_MasterPublicKeyP mpub;
-  uint32_t dki_len;
-@};
-@end example
-
-This is then followed by @cite{dki_len} signatures of the auditor of type
-@cite{struct TALER_AuditorSignatureP}, which are then followed by another
-@cite{dki_len} blocks of type @cite{struct TALER_DenominationKeyValidityPS}.
-The auditor's signatures must be signatures over the information of
-the corresponding denomination key validity structures embedded in a
-@cite{struct TALER_ExchangeKeyValidityPS} structure using the
-@cite{TALER_SIGNATURE_AUDITOR_EXCHANGE_KEYS} purpose.
-
-
-
-@c **********************************************************
-@c *******************  Appendices  *************************
-@c **********************************************************
-
-@node GNU-AGPL
-@chapter GNU Affero GPL
-@cindex license
-@include agpl.texi
-
-@node GNU-FDL
-@chapter GNU Free Documentation License
-@cindex license
-@include fdl-1.3.texi
-
-@node Concept Index
-@chapter Concept Index
-
-@printindex cp
-
-@bye