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+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
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+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU 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 General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmerrams.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
+

README

@@ -0,0 +1,10 @@
+HtmlSteg :
+----------
+
+Is able to hide raw datas in "invisible" HTML characters (repeating whitespaces).
+
+Examples :
+----------
+
+./htmlsteg.py -s examples/gnu.html -i examples/Gordon.jpg > /tmp/gnu_gordon.html
+./htmlsteg.py -i /tmp/gnu_gordon.html -u > /tmp/out.jpg

htmlsteg.py

@@ -0,0 +1,77 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-#
+
+# Copyright 2017 Weber Yann <yann.weber@member.fsf.org>
+#
+# This file is part of HtmlSteg.
+#
+#        HtmlSteg is free software: you can redistribute it and/or modify
+#        it under the terms of the GNU General Public License as published by
+#        the Free Software Foundation, either version 3 of the License, or
+#        any later version.
+#
+#        HtmlSteg 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 General Public License for more details.
+#
+#        You should have received a copy of the GNU General Public License
+#        along with HtmlSteg.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+import sys
+import argparse
+
+from steg import clean_html, hide, unhide
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(description='Html steganography program')
+    parser.add_argument('-u', '--unhide', action='store_const',
+        default=False, const=True,
+        help="Unhide from input")
+    parser.add_argument('-i', '--input', metavar='FILE', type=str,
+        default='-', help='Filename or - for stdin')
+    parser.add_argument('-o', '--output', metavar='FILE', type=str,
+        default='-', help='Filename or - for stdout')
+    parser.add_argument('-s', '--hide', metavar='FILE', type=str,
+        default='', help="Html filename to hide input in")
+    args = parser.parse_args()
+
+    if len(args.hide) > 0 and args.unhide:
+        sys.stderr.write('--unhide and --hide cannot be set at same time')
+        parser.print_help()
+        exit(1)
+
+    try:
+        if args.output == '-':
+            fdout = sys.stdout
+        else:
+            fdout = open(args.output, 'w+')
+        if args.input == '-':
+            data_in = bytearray(sys.stdin.read())
+        else:
+            with open(args.input, 'r') as fdin:
+                data_in = fdin.read()
+    except Exception as e:
+        parser.print_help()
+        raise e
+
+    if args.unhide:
+        res = unhide(data_in)
+        fdout.write(res)
+    elif len(args.hide) > 0:
+        try:
+            with open(args.hide, 'r') as fdhtml:
+                html = fdhtml.read()
+        except Exception as e:
+            parser.print_help()
+            raise e
+
+        data_in = bytearray(data_in)
+        html = clean_html(html)
+        html = hide(html, data_in)
+        fdout.write(html)
+    else:
+        parser.print_help()
+        exit(1)
+

steg.py

@@ -0,0 +1,97 @@
+# -*- coding: utf-8 -*-#
+
+# Copyright 2017 Weber Yann <yann.weber@member.fsf.org>
+#
+# This file is part of HtmlSteg.
+#
+#        HtmlSteg is free software: you can redistribute it and/or modify
+#        it under the terms of the GNU General Public License as published by
+#        the Free Software Foundation, either version 3 of the License, or
+#        (at your option) any later version.
+#
+#        HtmlSteg 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 General Public License for more details.
+#
+#        You should have received a copy of the GNU General Public License
+#        along with HtmlSteg.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+import warnings
+
+R_CHARS = [' ', "\t", "\n"]
+
+def clean_html(html):
+    '''Clean html squeezing repeating R_CHARS'''
+    res = ''
+    prev = None
+    for c in html:
+        if c in R_CHARS and c == prev:
+            continue
+        prev = c
+        res += c
+    return res
+
+def hide(html, payload):
+    cur_val = payload[0]
+    cur_bit = cur_val & 1
+    cur_val >>= 1
+    cur_shift = 1
+    payload = payload[1:]
+
+    end = False
+    res = ''
+    for c in html:
+        if not end and c in R_CHARS:
+            if cur_bit == 1:
+                res += c
+            if cur_shift == 8:
+                cur_shift = 0
+                if len(payload) == 0:
+                    end = True
+                else:
+                    cur_val = payload[0]
+                    payload = payload[1:]
+            cur_bit = cur_val & 1
+            cur_val >>= 1
+            cur_shift += 1
+        res += c
+    if not end:
+        if len(payload) > 0:
+            warnings.warn(
+                'Unable to hide all payload. %d bytes not hidden : "%s"' % (
+                    len(payload), repr(payload)))
+        if cur_shift != 8:
+            warnings.warn(
+                'last byte not complete. %d bits missing' % (8 - cur_shift))
+    return res
+
+
+def unhide(html):
+    res = bytearray()
+    cur_byte = 0
+    cur_shift = 0
+    prev = None
+    pre_add = False
+    for c in html:
+        bit_added = False
+        if c in R_CHARS and prev == c:
+                #1
+                cur_byte += 1 << cur_shift
+                bit_added = True
+                c = None
+        elif prev in R_CHARS:
+            #0
+            bit_added = True
+        if bit_added:
+            if cur_shift == 7:
+                #print("unhide byte ", bytearray([cur_byte]))
+                res += bytearray([cur_byte])
+                cur_byte = 0
+                cur_shift = 0
+            else:
+                cur_shift += 1
+        prev = c
+    return res
+