Initial import.

Still needs documentation.

doc/sphinx/Makefile

@@ -0,0 +1,177 @@
+# Makefile for Sphinx documentation
+#
+
+# You can set these variables from the command line.
+SPHINXOPTS    =
+SPHINXBUILD   = sphinx-build
+PAPER         =
+BUILDDIR      = build
+
+# User-friendly check for sphinx-build
+ifeq ($(shell which $(SPHINXBUILD) >/dev/null 2>&1; echo $$?), 1)
+$(error The '$(SPHINXBUILD)' command was not found. Make sure you have Sphinx installed, then set the SPHINXBUILD environment variable to point to the full path of the '$(SPHINXBUILD)' executable. Alternatively you can add the directory with the executable to your PATH. If you don't have Sphinx installed, grab it from http://sphinx-doc.org/)
+endif
+
+# Internal variables.
+PAPEROPT_a4     = -D latex_paper_size=a4
+PAPEROPT_letter = -D latex_paper_size=letter
+ALLSPHINXOPTS   = -d $(BUILDDIR)/doctrees $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) source
+# the i18n builder cannot share the environment and doctrees with the others
+I18NSPHINXOPTS  = $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) source
+
+.PHONY: help clean html dirhtml singlehtml pickle json htmlhelp qthelp devhelp epub latex latexpdf text man changes linkcheck doctest gettext
+
+help:
+	@echo "Please use \`make <target>' where <target> is one of"
+	@echo "  html       to make standalone HTML files"
+	@echo "  dirhtml    to make HTML files named index.html in directories"
+	@echo "  singlehtml to make a single large HTML file"
+	@echo "  pickle     to make pickle files"
+	@echo "  json       to make JSON files"
+	@echo "  htmlhelp   to make HTML files and a HTML help project"
+	@echo "  qthelp     to make HTML files and a qthelp project"
+	@echo "  devhelp    to make HTML files and a Devhelp project"
+	@echo "  epub       to make an epub"
+	@echo "  latex      to make LaTeX files, you can set PAPER=a4 or PAPER=letter"
+	@echo "  latexpdf   to make LaTeX files and run them through pdflatex"
+	@echo "  latexpdfja to make LaTeX files and run them through platex/dvipdfmx"
+	@echo "  text       to make text files"
+	@echo "  man        to make manual pages"
+	@echo "  texinfo    to make Texinfo files"
+	@echo "  info       to make Texinfo files and run them through makeinfo"
+	@echo "  gettext    to make PO message catalogs"
+	@echo "  changes    to make an overview of all changed/added/deprecated items"
+	@echo "  xml        to make Docutils-native XML files"
+	@echo "  pseudoxml  to make pseudoxml-XML files for display purposes"
+	@echo "  linkcheck  to check all external links for integrity"
+	@echo "  doctest    to run all doctests embedded in the documentation (if enabled)"
+
+clean:
+	rm -rf $(BUILDDIR)/*
+
+html:
+	$(SPHINXBUILD) -b html $(ALLSPHINXOPTS) $(BUILDDIR)/html
+	@echo
+	@echo "Build finished. The HTML pages are in $(BUILDDIR)/html."
+
+dirhtml:
+	$(SPHINXBUILD) -b dirhtml $(ALLSPHINXOPTS) $(BUILDDIR)/dirhtml
+	@echo
+	@echo "Build finished. The HTML pages are in $(BUILDDIR)/dirhtml."
+
+singlehtml:
+	$(SPHINXBUILD) -b singlehtml $(ALLSPHINXOPTS) $(BUILDDIR)/singlehtml
+	@echo
+	@echo "Build finished. The HTML page is in $(BUILDDIR)/singlehtml."
+
+pickle:
+	$(SPHINXBUILD) -b pickle $(ALLSPHINXOPTS) $(BUILDDIR)/pickle
+	@echo
+	@echo "Build finished; now you can process the pickle files."
+
+json:
+	$(SPHINXBUILD) -b json $(ALLSPHINXOPTS) $(BUILDDIR)/json
+	@echo
+	@echo "Build finished; now you can process the JSON files."
+
+htmlhelp:
+	$(SPHINXBUILD) -b htmlhelp $(ALLSPHINXOPTS) $(BUILDDIR)/htmlhelp
+	@echo
+	@echo "Build finished; now you can run HTML Help Workshop with the" \
+	      ".hhp project file in $(BUILDDIR)/htmlhelp."
+
+qthelp:
+	$(SPHINXBUILD) -b qthelp $(ALLSPHINXOPTS) $(BUILDDIR)/qthelp
+	@echo
+	@echo "Build finished; now you can run "qcollectiongenerator" with the" \
+	      ".qhcp project file in $(BUILDDIR)/qthelp, like this:"
+	@echo "# qcollectiongenerator $(BUILDDIR)/qthelp/PACKAGE_NAME.qhcp"
+	@echo "To view the help file:"
+	@echo "# assistant -collectionFile $(BUILDDIR)/qthelp/PACKAGE_NAME.qhc"
+
+devhelp:
+	$(SPHINXBUILD) -b devhelp $(ALLSPHINXOPTS) $(BUILDDIR)/devhelp
+	@echo
+	@echo "Build finished."
+	@echo "To view the help file:"
+	@echo "# mkdir -p $$HOME/.local/share/devhelp/PACKAGE_NAME"
+	@echo "# ln -s $(BUILDDIR)/devhelp $$HOME/.local/share/devhelp/PACKAGE_NAME"
+	@echo "# devhelp"
+
+epub:
+	$(SPHINXBUILD) -b epub $(ALLSPHINXOPTS) $(BUILDDIR)/epub
+	@echo
+	@echo "Build finished. The epub file is in $(BUILDDIR)/epub."
+
+latex:
+	$(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex
+	@echo
+	@echo "Build finished; the LaTeX files are in $(BUILDDIR)/latex."
+	@echo "Run \`make' in that directory to run these through (pdf)latex" \
+	      "(use \`make latexpdf' here to do that automatically)."
+
+latexpdf:
+	$(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex
+	@echo "Running LaTeX files through pdflatex..."
+	$(MAKE) -C $(BUILDDIR)/latex all-pdf
+	@echo "pdflatex finished; the PDF files are in $(BUILDDIR)/latex."
+
+latexpdfja:
+	$(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex
+	@echo "Running LaTeX files through platex and dvipdfmx..."
+	$(MAKE) -C $(BUILDDIR)/latex all-pdf-ja
+	@echo "pdflatex finished; the PDF files are in $(BUILDDIR)/latex."
+
+text:
+	$(SPHINXBUILD) -b text $(ALLSPHINXOPTS) $(BUILDDIR)/text
+	@echo
+	@echo "Build finished. The text files are in $(BUILDDIR)/text."
+
+man:
+	$(SPHINXBUILD) -b man $(ALLSPHINXOPTS) $(BUILDDIR)/man
+	@echo
+	@echo "Build finished. The manual pages are in $(BUILDDIR)/man."
+
+texinfo:
+	$(SPHINXBUILD) -b texinfo $(ALLSPHINXOPTS) $(BUILDDIR)/texinfo
+	@echo
+	@echo "Build finished. The Texinfo files are in $(BUILDDIR)/texinfo."
+	@echo "Run \`make' in that directory to run these through makeinfo" \
+	      "(use \`make info' here to do that automatically)."
+
+info:
+	$(SPHINXBUILD) -b texinfo $(ALLSPHINXOPTS) $(BUILDDIR)/texinfo
+	@echo "Running Texinfo files through makeinfo..."
+	make -C $(BUILDDIR)/texinfo info
+	@echo "makeinfo finished; the Info files are in $(BUILDDIR)/texinfo."
+
+gettext:
+	$(SPHINXBUILD) -b gettext $(I18NSPHINXOPTS) $(BUILDDIR)/locale
+	@echo
+	@echo "Build finished. The message catalogs are in $(BUILDDIR)/locale."
+
+changes:
+	$(SPHINXBUILD) -b changes $(ALLSPHINXOPTS) $(BUILDDIR)/changes
+	@echo
+	@echo "The overview file is in $(BUILDDIR)/changes."
+
+linkcheck:
+	$(SPHINXBUILD) -b linkcheck $(ALLSPHINXOPTS) $(BUILDDIR)/linkcheck
+	@echo
+	@echo "Link check complete; look for any errors in the above output " \
+	      "or in $(BUILDDIR)/linkcheck/output.txt."
+
+doctest:
+	$(SPHINXBUILD) -b doctest $(ALLSPHINXOPTS) $(BUILDDIR)/doctest
+	@echo "Testing of doctests in the sources finished, look at the " \
+	      "results in $(BUILDDIR)/doctest/output.txt."
+
+xml:
+	$(SPHINXBUILD) -b xml $(ALLSPHINXOPTS) $(BUILDDIR)/xml
+	@echo
+	@echo "Build finished. The XML files are in $(BUILDDIR)/xml."
+
+pseudoxml:
+	$(SPHINXBUILD) -b pseudoxml $(ALLSPHINXOPTS) $(BUILDDIR)/pseudoxml
+	@echo
+	@echo "Build finished. The pseudo-XML files are in $(BUILDDIR)/pseudoxml."

doc/sphinx/source/building.rst

@@ -0,0 +1,37 @@
+-------------------------------
+Getting and Building the Source
+-------------------------------
+
+The source code is available via `Github
+<https://github.com/kisom/libemsha/>`_; each version should be git tagged. ::
+
+    git clone https://github.com/kisom/libemsha
+    git clone git@github.com:kisom/libemsha
+
+The current release is `1.0.0 <https://github.com/kisom/libemsha/archive/1.0.0.zip>`_.
+
+The project is built using Autotools and ``make``.
+
+When building from a git checkout, the `autobuild` script will bootstrap
+the project from the autotools sources (e.g. via ``autoreconf -i``),
+run ``configurei`` (by default to use clang), and attempt to build the library
+and run the unit tests.
+
+Once the autotools infrastructure has been bootstrapped, the following
+should work: ::
+
+    ./configure && make && make check && make install
+
+There are three flags to ``configure`` that might be useful:
+
++ ``--disable-hexstring`` disables the provided ``hexstring`` function;
+  while this might be useful in many cases, it also adds extra size to
+  the code.
+
++ ``--disable-hexlut`` disables the larger lookup table used by
+  ``hexstring``, which can save around a kilobyte of program space. If
+  the ``hexstring`` function is disabled, this option has no effect.
+
++ ``--disable-selftest`` disables the internal self-tests, which can
+  reclaim some additional program space.
+

doc/sphinx/source/conf.py.in

@@ -0,0 +1,335 @@
+# -*- coding: utf-8 -*-
+#
+# @PACKAGE_NAME@ documentation build configuration file, created by
+# sphinx-quickstart on Tue Dec 15 23:35:10 2015.
+#
+# This file is execfile()d with the current directory set to its
+# containing dir.
+#
+# Note that not all possible configuration values are present in this
+# autogenerated file.
+#
+# All configuration values have a default; values that are commented out
+# serve to show the default.
+
+import sys
+import os
+
+import sphinx_rtd_theme
+
+# If extensions (or modules to document with autodoc) are in another directory,
+# add these directories to sys.path here. If the directory is relative to the
+# documentation root, use os.path.abspath to make it absolute, like shown here.
+#sys.path.insert(0, os.path.abspath('.'))
+
+# -- General configuration ------------------------------------------------
+
+# If your documentation needs a minimal Sphinx version, state it here.
+#needs_sphinx = '1.0'
+
+# Add any Sphinx extension module names here, as strings. They can be
+# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
+# ones.
+extensions = [
+    'sphinx.ext.todo',
+]
+
+# Add any paths that contain templates here, relative to this directory.
+templates_path = ['_templates']
+
+# The suffix of source filenames.
+source_suffix = '.rst'
+
+# The encoding of source files.
+#source_encoding = 'utf-8-sig'
+
+# The master toctree document.
+master_doc = 'index'
+
+# General information about the project.
+project = u'@PACKAGE_NAME@'
+copyright = u'2015, @PACKAGE_AUTHOR@'
+
+# The version info for the project you're documenting, acts as replacement for
+# |version| and |release|, also used in various other places throughout the
+# built documents.
+#
+# The short X.Y version.
+version = '@PACKAGE_VERSION@'
+# The full version, including alpha/beta/rc tags.
+release = '@PACKAGE_VERSION@'
+
+# The language for content autogenerated by Sphinx. Refer to documentation
+# for a list of supported languages.
+#language = None
+
+# There are two options for replacing |today|: either, you set today to some
+# non-false value, then it is used:
+#today = ''
+# Else, today_fmt is used as the format for a strftime call.
+#today_fmt = '%B %d, %Y'
+
+# List of patterns, relative to source directory, that match files and
+# directories to ignore when looking for source files.
+exclude_patterns = []
+
+# The reST default role (used for this markup: `text`) to use for all
+# documents.
+#default_role = None
+
+# If true, '()' will be appended to :func: etc. cross-reference text.
+#add_function_parentheses = True
+
+# If true, the current module name will be prepended to all description
+# unit titles (such as .. function::).
+#add_module_names = True
+
+# If true, sectionauthor and moduleauthor directives will be shown in the
+# output. They are ignored by default.
+#show_authors = False
+
+# The name of the Pygments (syntax highlighting) style to use.
+pygments_style = 'sphinx'
+
+# A list of ignored prefixes for module index sorting.
+#modindex_common_prefix = []
+
+# If true, keep warnings as "system message" paragraphs in the built documents.
+#keep_warnings = False
+
+highlight_language = 'c++'
+
+
+# -- Options for HTML output ----------------------------------------------
+
+# The theme to use for HTML and HTML Help pages.  See the documentation for
+# a list of builtin themes.
+html_theme = 'sphinx_rtd_theme'
+
+# Theme options are theme-specific and customize the look and feel of a theme
+# further.  For a list of options available for each theme, see the
+# documentation.
+#html_theme_options = {}
+
+# Add any paths that contain custom themes here, relative to this directory.
+#html_theme_path = []
+html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]
+
+# The name for this set of Sphinx documents.  If None, it defaults to
+# "<project> v<release> documentation".
+#html_title = None
+
+# A shorter title for the navigation bar.  Default is the same as html_title.
+#html_short_title = None
+
+# The name of an image file (relative to this directory) to place at the top
+# of the sidebar.
+#html_logo = None
+
+# The name of an image file (within the static path) to use as favicon of the
+# docs.  This file should be a Windows icon file (.ico) being 16x16 or 32x32
+# pixels large.
+#html_favicon = None
+
+# Add any paths that contain custom static files (such as style sheets) here,
+# relative to this directory. They are copied after the builtin static files,
+# so a file named "default.css" will overwrite the builtin "default.css".
+html_static_path = ['_static']
+
+# Add any extra paths that contain custom files (such as robots.txt or
+# .htaccess) here, relative to this directory. These files are copied
+# directly to the root of the documentation.
+#html_extra_path = []
+
+# If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
+# using the given strftime format.
+#html_last_updated_fmt = '%b %d, %Y'
+
+# If true, SmartyPants will be used to convert quotes and dashes to
+# typographically correct entities.
+#html_use_smartypants = True
+
+# Custom sidebar templates, maps document names to template names.
+#html_sidebars = {}
+
+# Additional templates that should be rendered to pages, maps page names to
+# template names.
+#html_additional_pages = {}
+
+# If false, no module index is generated.
+#html_domain_indices = True
+
+# If false, no index is generated.
+#html_use_index = True
+
+# If true, the index is split into individual pages for each letter.
+#html_split_index = False
+
+# If true, links to the reST sources are added to the pages.
+#html_show_sourcelink = True
+
+# If true, "Created using Sphinx" is shown in the HTML footer. Default is True.
+#html_show_sphinx = True
+
+# If true, "(C) Copyright ..." is shown in the HTML footer. Default is True.
+#html_show_copyright = True
+
+# If true, an OpenSearch description file will be output, and all pages will
+# contain a <link> tag referring to it.  The value of this option must be the
+# base URL from which the finished HTML is served.
+#html_use_opensearch = ''
+
+# This is the file name suffix for HTML files (e.g. ".xhtml").
+#html_file_suffix = None
+
+# Output file base name for HTML help builder.
+htmlhelp_basename = 'PACKAGE_NAMEdoc'
+
+
+# -- Options for LaTeX output ---------------------------------------------
+
+latex_elements = {
+# The paper size ('letterpaper' or 'a4paper').
+#'papersize': 'letterpaper',
+
+# The font size ('10pt', '11pt' or '12pt').
+#'pointsize': '10pt',
+
+# Additional stuff for the LaTeX preamble.
+#'preamble': '',
+}
+
+# Grouping the document tree into LaTeX files. List of tuples
+# (source start file, target name, title,
+#  author, documentclass [howto, manual, or own class]).
+latex_documents = [
+  ('index', 'PACKAGE_NAME.tex', u'@PACKAGE\\_NAME@ Documentation',
+   u'@PACKAGE\\_AUTHOR@', 'manual'),
+]
+
+# The name of an image file (relative to this directory) to place at the top of
+# the title page.
+#latex_logo = None
+
+# For "manual" documents, if this is true, then toplevel headings are parts,
+# not chapters.
+#latex_use_parts = False
+
+# If true, show page references after internal links.
+#latex_show_pagerefs = False
+
+# If true, show URL addresses after external links.
+#latex_show_urls = False
+
+# Documents to append as an appendix to all manuals.
+#latex_appendices = []
+
+# If false, no module index is generated.
+#latex_domain_indices = True
+
+
+# -- Options for manual page output ---------------------------------------
+
+# One entry per manual page. List of tuples
+# (source start file, name, description, authors, manual section).
+man_pages = [
+    ('index', 'package_name', u'@PACKAGE_NAME@ Documentation',
+     [u'@PACKAGE_AUTHOR@'], 1)
+]
+
+# If true, show URL addresses after external links.
+#man_show_urls = False
+
+
+# -- Options for Texinfo output -------------------------------------------
+
+# Grouping the document tree into Texinfo files. List of tuples
+# (source start file, target name, title, author,
+#  dir menu entry, description, category)
+texinfo_documents = [
+  ('index', 'PACKAGE_NAME', u'@PACKAGE_NAME@ Documentation',
+   u'@PACKAGE_AUTHOR@', 'PACKAGE_NAME', 'One line description of project.',
+   'Miscellaneous'),
+]
+
+# Documents to append as an appendix to all manuals.
+#texinfo_appendices = []
+
+# If false, no module index is generated.
+#texinfo_domain_indices = True
+
+# How to display URL addresses: 'footnote', 'no', or 'inline'.
+#texinfo_show_urls = 'footnote'
+
+# If true, do not generate a @detailmenu in the "Top" node's menu.
+#texinfo_no_detailmenu = False
+
+
+# -- Options for Epub output ----------------------------------------------
+
+# Bibliographic Dublin Core info.
+epub_title = u'@PACKAGE_NAME@'
+epub_author = u'@PACKAGE_AUTHOR@'
+epub_publisher = u'@PACKAGE_AUTHOR@'
+epub_copyright = u'2015, @PACKAGE_AUTHOR@'
+
+# The basename for the epub file. It defaults to the project name.
+#epub_basename = u'@PACKAGE_NAME@'
+
+# The HTML theme for the epub output. Since the default themes are not optimized
+# for small screen space, using the same theme for HTML and epub output is
+# usually not wise. This defaults to 'epub', a theme designed to save visual
+# space.
+#epub_theme = 'epub'
+
+# The language of the text. It defaults to the language option
+# or en if the language is not set.
+#epub_language = ''
+
+# The scheme of the identifier. Typical schemes are ISBN or URL.
+#epub_scheme = ''
+
+# The unique identifier of the text. This can be a ISBN number
+# or the project homepage.
+#epub_identifier = ''
+
+# A unique identification for the text.
+#epub_uid = ''
+
+# A tuple containing the cover image and cover page html template filenames.
+#epub_cover = ()
+
+# A sequence of (type, uri, title) tuples for the guide element of content.opf.
+#epub_guide = ()
+
+# HTML files that should be inserted before the pages created by sphinx.
+# The format is a list of tuples containing the path and title.
+#epub_pre_files = []
+
+# HTML files shat should be inserted after the pages created by sphinx.
+# The format is a list of tuples containing the path and title.
+#epub_post_files = []
+
+# A list of files that should not be packed into the epub file.
+epub_exclude_files = ['search.html']
+
+# The depth of the table of contents in toc.ncx.
+#epub_tocdepth = 3
+
+# Allow duplicate toc entries.
+#epub_tocdup = True
+
+# Choose between 'default' and 'includehidden'.
+#epub_tocscope = 'default'
+
+# Fix unsupported image types using the PIL.
+#epub_fix_images = False
+
+# Scale large images.
+#epub_max_image_width = 0
+
+# How to display URL addresses: 'footnote', 'no', or 'inline'.
+#epub_show_urls = 'inline'
+
+# If false, no index is generated.
+#epub_use_index = True

doc/sphinx/source/hash.rst

@@ -0,0 +1,74 @@
+------------------
+The Hash interface
+------------------
+
+.. cpp:class:: emsha::Hash
+
+   The ``Hash`` class contains a top-level interface for the objects in
+   this library.
+
+In general, a `Hash` is used along the lines of: ::
+
+        emsha::EMSHA_RESULT
+        hash_single_pass(uint8_t *m, uint32_t ml, uint8_t *digest)
+        {
+                // Depending on the implementation, the constructor may need
+                // arguments.
+                emsha::Hash         h;
+                emsha::EMSHA_RESULT res;
+                
+                res = h.write(m, ml);
+                if (emsha::EMSHA_ROK != res) {
+                        return res;        
+                }
+        
+                // digest will contain the output of the Hash, and the
+                // caller MUST ensure that there is enough space in
+                // the buffer.
+                return h.result(d);
+        }
+
+Methods
+^^^^^^^
+
+.. cpp:function:: emsha::EMSHA_RESULT reset(void)
+
+   reset should bring the Hash back into its initial state. That is,
+   the idea is that::
+   
+       hash->reset();
+       hash->update(...); // possibly many of these...
+       hash->result(...); // should always return the same hash.
+   
+   is idempotent, assuming the inputs to ``update`` and ``result``
+   are constant. The implications of this for a given concrete class
+   should be described in that class's documentation, but in general,
+   it has the effect of preserving any initial state while removing any
+   data written to the Hash via the update method.
+
+.. cpp:function:: emsha::EMSHA_RESULT update(const uint8_t *m, uint32_t ml)
+   
+   ``update`` is used to write message data into
+   the Hash.
+
+.. cpp:function:: emsha::EMSHA_RESULT finalize(uint8_t *d)
+
+   ``finalize`` should carry out any final operations on the `Hash`;
+   after a call to finalize, no more data can be written.  Additionally,
+   it transfers out the resulting hash into its argument.
+
+   Note that this library does not allocate memory, and therefore the
+   caller *must* ensure that ``d`` is a valid buffer containing at least
+   ``this->size()`` bytes.
+
+.. cpp:function:: emsha::EMSHA_RESULT result(uint8_t *d)
+
+   ``result`` is used to transfer out the hash to the argument. This implies
+   that the `Hash` must keep enough state for repeated calls to ``result``
+   to work.
+
+.. cpp:function:: uint32_t size(void)
+
+   ``size`` should return the output size of the `Hash`; this is, how large
+   the buffers written to by ``result`` should be.
+

doc/sphinx/source/hmac.rst

@@ -0,0 +1,3 @@
+--------------
+The HMAC class
+--------------

doc/sphinx/source/index.rst

@@ -0,0 +1,34 @@
+.. libemsha documentation master file, created by
+   sphinx-quickstart on Tue Dec 15 23:35:10 2015.
+   You can adapt this file completely to your liking, but it should at least
+   contain the root `toctree` directive.
+
+libemsha
+========
+
+This library is an MIT-licensed compact HMAC-SHA-256 C++11 library
+designed for embedded systems. It is built following the JPL `Power of
+Ten <http://spinroot.com/gerard/pdf/P10.pdf>`_ rules.
+
+Contents:
+
+.. toctree::
+   :maxdepth: 2
+
+   building
+   intro
+   hash
+   sha256
+   hmac
+   misc
+
+
+
+
+Indices and tables
+==================
+
+* :ref:`genindex`
+* :ref:`modindex`
+* :ref:`search`
+

doc/sphinx/source/intro.rst

@@ -0,0 +1,46 @@
+-------------
+Introduction
+-------------
+
+.. cpp:namespace:: emsha
+
+The package provides a pair of classes, :cpp:class:`SHA256` and
+:cpp:class:`HMAC`, that both satisfy a common interface :cpp:class:`Hash`. All
+functionality provided by this library is found under the ``emsha`` namespace.
+
+
+``EMSHA_RESULT``
+^^^^^^^^^^^^^^^^^
+
+The ``EMSHA_RESULT`` enum is used to convey the result of an
+operation. The possible values are:
+
+.. cpp:enum:: _EMSHA_RESULT_ : uint8_t
+
+::
+
+                // All operations have completed successfully so far.
+                EMSHA_ROK = 0,
+                
+                // A self test or unit test failed.
+                EMSHA_TEST_FAILURE = 1,
+                
+                // A null pointer was passed in as a buffer where it
+                // shouldn't have been.
+                EMSHA_NULLPTR = 2,
+                
+                // The Hash is in an invalid state.
+                EMSHA_INVALID_STATE = 3,
+                
+                // The input to SHA256::update is too large.
+                SHA256_INPUT_TOO_LONG = 4,
+                
+                // The self tests have been disabled, but a self test
+                // function was called.
+                EMSHA_SELFTEST_DISABLED = 5
+
+As a convenience, the following ``typedef`` is also provided.
+
+ ``typedef enum _EMSHA_RESULT_`` :cpp:type:`EMSHA_RESULT`
+
+

doc/sphinx/source/misc.rst

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+-----------------------
+Miscellaneous functions
+-----------------------
+

doc/sphinx/source/sha256.rst

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+-----------------
+The SHA256 class
+-----------------
+
+.. cpp:class:: emsha::SHA256
+
+   SHA256 is an implementation of the :cpp:class:`emsha::Hash`
+   interface.
+
+.. cpp:function:: SHA256::SHA256()
+		  
+   A SHA256 context does not need any special construction. It can be
+   declared and immediately start being used.
+
+
+.. cpp:function:: SHA256::~SHA256()
+		  
+   The SHA256 destructor will clear out its internal message buffer;
+   all of the members are local and not resource handles, so cleanup
+   is minimal.
+
+
+.. cpp:function:: emsha::EMSHA_RESULT SHA256::reset(void)
+
+   reset clears the internal state of the `SHA256` context and returns
+   it to its initial state.  It should always return ``EMSHA_ROK``.
+
+.. cpp:function:: emsha::EMSHA_RESULT SHA256::update(const uint8_t *m, uint32_t ml)
+		  
+   update writes data into the context. While there is an upper limit
+   on the size of data that SHA-256 can operate on, this package is
+   designed for small systems that will not approach that level of
+   data (which is on the order of 2 exabytes), so it is not thought to
+   be a concern.
+
+   **Inputs**:
+
+   + ``m``: a byte array containing the message to be written. It must
+     not be NULL (unless the message length is zero).
+       
+   + ``ml``: the message length, in bytes.
+    
+   **Return values**:
+   
+   * ``EMSHA_NULLPTR`` is returned if ``m`` is NULL and ``ml`` is nonzero.
+    
+   * ``EMSHA_INVALID_STATE`` is returned if the `update` is called 
+     after a call to `finalize`.
+    
+   * ``SHA256_INPUT_TOO_LONG`` is returned if too much data has been
+     written to the context.
+    
+   + ``EMSHA_ROK`` is returned if the data was successfully added to
+     the SHA-256 context.
+
+
+.. cpp:function:: emsha::EMSHA_RESULT SHA256::finalize(uint8_t *d)
+
+   ``finalize`` completes the digest. Once this method is called, the
+   context cannot be updated unless the context is reset.
+    
+   **Inputs**:
+   
+   * d: a byte buffer that must be at least ``SHA256.size()`` in
+     length.
+    
+   **Outputs**:
+   
+   * ``EMSHA_NULLPTR`` is returned if ``d`` is the null pointer.
+    
+   * ``EMSHA_INVALID_STATE`` is returned if the SHA-256 context is in
+     an invalid state, such as if there were errors in previous
+     updates.
+    
+   * ``EMSHA_ROK`` is returned if the context was successfully
+     finalised and the digest copied to ``d``.
+
+
+.. cpp:function:: emsha::EMSHA_RESULT SHA256::result(uint8_t *d)
+		  
+   ``result`` copies the result from the SHA-256 context into the
+   buffer pointed to by ``d``, running finalize if needed. Once
+   called, the context cannot be updated until the context is reset.
+    
+   **Inputs**:
+   
+   * ``d``: a byte buffer that must be at least ``SHA256.size()`` in
+     length.
+    
+   **Outputs**:
+   
+   * ``EMSHA_NULLPTR`` is returned if ``d`` is the null pointer.
+    
+   * ``EMSHA_INVALID_STATE`` is returned if the SHA-256 context is in
+     an invalid state, such as if there were errors in previous
+     updates.
+    
+   * ``EMSHA_ROK`` is returned if the context was successfully
+     finalised and the digest copied to ``d``.
+
+.. cpp:function:: uint32_t SHA256::size(void)
+
+   ``size`` returns the output size of SHA256, e.g.
+   the size that the buffers passed to ``finalize``
+   and ``result`` should be.
+    
+   **Outputs**:
+
+   * a ``uint32_t`` representing the expected size of buffers passed
+     to ``result`` and ``finalize``.
+