/usr/bin/gpgparticipants-prefill is in signing-party 1.1.10-3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 | #! /usr/bin/python
"""Fill in the first digits of the hash in a form created by gpgparticipants."""
__version__ = "1.0"
__author__ = "Stefan Huber"
__email__ = "shuber@sthu.org"
__copyright__ = "Copyright 2013, Stefan Huber"
__license__ = "MIT"
# also Copyright 2014 Peter Palfrader
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation
# files (the "Software"), to deal in the Software without
# restriction, including without limitation the rights to use,
# copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following
# conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
# OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.
import sys
import hashlib
import getopt
hexdigits = "0123456789abcdef"
def insertspaces(s):
"""Inserts a space after every 4-th character, and three spaces after every
8-th character of string s."""
def inpacks(s, n):
while len(s) > 0:
yield s[0:n]
s = s[n:]
out = " ".join([ " ".join(inpacks(octp, 4)) for octp in inpacks(s, 8)])
return out
def range_hex(length, fixed_prefix=''):
"""Give all hex-strings from 00...0 until ff...f of given length."""
if length == 0:
yield ""
elif len(fixed_prefix) > 0:
prefix = fixed_prefix[0]
for postfix in range_hex(length-1, fixed_prefix[1:]):
yield prefix + postfix
elif length == 1:
for c in hexdigits:
yield c
elif length > 1:
for prefix in range_hex(length-1):
for postfix in range_hex(1):
yield prefix + postfix
def usage():
"""Print --help text"""
print("""Usage:
{0} <emptylist> <filledlist>
{0} --help
{0} -h
Takes a file produced by gpgparticipants as <emptylist> and trys to fill in
some digits into the SHA256 field such that the resulting list actually has
a SHA256 checksum that starts with those digits. Whenever a match is found a
file with the digits filled in is written to `<filledlist>.DIGITS`.
OPTIONS:
--fastforward If a match is found of given length and --fastforward
is given then the program immediately jumps to the next
length.
--min-length NUM Start search with given length.
--max-length NUM Stop search with given length.
""".format(sys.argv[0]))
if __name__ == "__main__":
fastforward = False
minlength = 1
maxlength = 32
prefix = ''
optlist, args = getopt.getopt(sys.argv[1:], 'h', ['fastforward', 'min-length=', 'max-length=', 'prefix=', 'help'])
for o, a in optlist:
if o in ("-h", "--help"):
usage()
exit(0)
elif o in ("--fastforward"):
fastforward = True
elif o in ("--min-length"):
minlength = int(a)
elif o in ("--max-length"):
maxlength = int(a)+1
elif o in ("--prefix"):
prefix = a.lower()
if len(args) < 2:
print >>sys.stderr, "You need to give two filenames."
exit(1)
if not all(c in hexdigits for c in prefix):
print >>sys.stderr, "Invalid prefix."
exit(1)
emptyfile = open(args[0]).read()
idx = emptyfile.find("SHA256 Checksum:")
idx = emptyfile.find("_", idx)
for l in range(minlength, maxlength):
print "Looking at length", l
for h in range_hex(l, prefix):
H = insertspaces(h.upper())
filledfile = emptyfile[:idx] + H + emptyfile[idx+len(H):]
actual = hashlib.sha256(filledfile).hexdigest()
if actual[:len(h)] == h:
print "Found: ", H
open(args[1] + "." + h, "w").write(filledfile)
if fastforward:
break
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