lc4 v2.8
This commit is contained in:
Bernhard Esslinger
parent
afd976344d
commit
f434682a2f
160
lc4.py
Executable file → Normal file
160
lc4.py
Executable file → Normal file
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@ -1,27 +1,47 @@
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#!/usr/bin/python2
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# -*- coding: utf-8 -*-
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# This software is hereby released into public domain. Use it wisely.
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#
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# ElsieFour (LC4) and its enhancement LS47
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# version 2.7: 2018-02-13
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#
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# - Python script for LS47 originally written by Mirek Kratochvil (2017)
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# ElsieFour (LC4) and its enhancement LS47
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# version 2.8: 2018-05-30
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#
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# Original paper by Alan Kaminsky: https://eprint.iacr.org/2017/339.pdf
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# Original LC4 Java source: https://www.cs.rit.edu/~ark/parallelcrypto/elsiefour/
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#
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# - Python 2 script for LS47 originally written by Mirek Kratochvil (2017)
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# See https://github.com/exaexa/ls47
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# - Python 3 port by Bernhard Esslinger / AK (Feb 2018)
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# See www.mysterytwisterc3.org
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# - New options by CrypTool project (www.cryptool.org) (Feb 2018) in order to
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# support both ciphers LC4 and LS47, both ways to deal with nonces, keyword
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# usage for both LC4 and LS47, reading from file and commandline, and
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# extended test outputs.
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#
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# support both ciphers LC4 and LS47 in one program, to support both ways to
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# deal with nonces and keywords, to support reading from file and commandline,
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# and to extend test outputs (v2.7).
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# - v2.8 extended the testcase and added the fix of the fixpoint-ish problem for ls47 (option -m1):
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# python lc4-ls47.py -6 -ws thisismysecretkey -es ############## -ns igxf5e -m1
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# igxf5egcyhoo#ny#o5i5
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# python lc4-ls47.py -6 -ws thisismysecretkey -es ############## -ns igxf5e -m0
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# igxf5e##############
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#
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# Sample calls:
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# - Using cipher LC4, enforced with option -6:
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#
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# Using cipher LC4, enforced with option -6:
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# // encrypt (key, message). Following example returns tk5j23tq94_gw9c#lhzs
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# python lc4-ls47.py -6 -ks s2ferw_nx346ty5odiupq#lmz8ajhgcvk79b -es aaaaaaaaaaaaaaaaaaaa
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# // decrypt (key, message). Following example returns aaaaaaaaaaaaaaaaaaaa
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# python lc4-ls47.py -6 -ks s2ferw_nx346ty5odiupq#lmz8ajhgcvk79b -ds tk5j23tq94_gw9c#lhzs
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# python lc4-ls47.py -6 -ws thisismysecretkey -es its_my_fathers_son_but_not_my_brother
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# python lc4-ls47.py -6 -ws thisismysecretkey -ds 6dudfy3u7omoxy4jbscgn37c2se_d8gx6ogk9
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# python lc4-ls47.py -6 -ws thisismysecretkey -es its_my_fathers_son_but_not_my_brother -v -nl 6
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# python lc4-ls47.py -6 -ws thisismysecretkey -ds q6xojffkncfyz#f5czs49#3mbsco#2iscvbnm#bymaf -v -nl 6
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# - Using cipher LS47, enforced with option -7:
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# python lc4-ls47.py -7 -ws s3cret_p4ssw0rd/31337 -ds y'zbvvs+d2,ky4sy?w(_wkz*7'90v:./s)kcz?mj+gyu8-'h(y,i+v,z+1ws -v -nl 10
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# python lc4-ls47.py -7 -ws s3cret_p4ssw0rd/31337 -ds y'zbvvs+d2,ky4sy?w(_wkz*7'90v:./s)kcz?mj+gyu8-'h(y,i+v,z+1ws -v -ns 8y(l._4ct'
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#
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# Using cipher LS47, enforced with option -7:
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# python lc4-ls47.py -7 -ws s3cret_p4ssw0rd/31337 -es conflagrate_the_rose_bush_at_six!---peace-vector-3 -v -ns 8y(l._4ct' -m0
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# python lc4-ls47.py -7 -ws s3cret_p4ssw0rd/31337 -ds y'zbvvs+d2,ky4sy?w(_wkz*7'90v:./s)kcz?mj+gyu8-'h(y,i+v,z+1ws -v -nl 10 -m0
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# python lc4-ls47.py -7 -ws s3cret_p4ssw0rd/31337 -ds y'zbvvs+d2,ky4sy?w(_wkz*7'90v:./s)kcz?mj+gyu8-'h(y,i+v,z+1ws -v -ns 8y(l._4ct' -m0
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#
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# Using the automatic test (option -t can be combined with options -s and -ws)
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# python lc4-ls47.py -t
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# python lc4-ls47.py -t -ws s3cret_p4sswxyz -s peacevector_34
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from __future__ import print_function
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@ -31,7 +51,7 @@ import random
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import argparse
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version = "v2.7 (2018-02-13)"
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version = "v2.8 (2018-05-30)"
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letters6 = "#_23456789abcdefghijklmnopqrstuvwxyz"
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letters7 = "_abcdefghijklmnopqrstuvwxyz.0123456789,-+*/:?!'()"
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@ -160,7 +180,7 @@ def encrypt(plaintext):
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def decrypt(ciphertext):
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global key, mp
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plaintext = ''
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for c in ciphertext:
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cp = find_pos(key, c)
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@ -212,17 +232,19 @@ def eprint(*args, **kwargs):
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print(*args, file=sys.stderr, **kwargs)
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def printinfo(enc=False):
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def printinfo(enc=False): # used by test1() and when option -v
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eprint('CIPHER : ' + ("LC4" if size==6 else "LS47"))
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eprint('ALPHABET : ' + letters)
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if args.keywordstring:
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eprint('KEYWORD : ' + args.keywordstring)
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if szkeyword:
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eprint('KEYWORD : ' + szkeyword)
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eprint('KEY : ' + initialkey) # key variable modified during process?
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eprint('NONCE : ' + nonce)
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eprint('NONCE ENC : ' + nonce_enc)
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eprint('NONCEMODE : ' + ("Kaminsky" if nonce_mode==1 else "Kratochvil"))
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eprint('MARKER : ' + ("Kaminsky" if marker_mode==1 else "Kratochvil"))
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if enc:
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# if args.signature: print ("args.SIGNA:", args.signature)
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if szsignature: print ("SIGNATURE: ", szsignature)
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eprint('PLAINTEXT : ' + plaintext)
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eprint('CIPHERTEXT: ' + ciphertext)
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else:
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@ -230,24 +252,32 @@ def printinfo(enc=False):
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eprint('PLAINTEXT : ' + plaintext)
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def test1(size):
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global letters, nonce_mode, marker_mode, tiles, noncelen, nonce, nonce_size, nonce_enc, signature
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def test1(size, fixednonce):
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# Declaration "global" only needed if you like to write to a global variable
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# [here, this is necessary only if the global var. is used within a fct. called by test1()]
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# As test1() is called several times don't change args components within this fct.
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global letters, nonce_mode, marker_mode, tiles, noncelen, nonce, nonce_size, nonce_enc
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global ciphertext, plaintext, key, initialkey, mp
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global szkeyword, szsignature
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if size == 7:
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CIPHERNAME = "LS47"
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letters = letters7;
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letters = letters7
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nonce_mode = 2
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marker_mode = 2
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noncelen=10; nonce = create_random_nonce(noncelen)
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# nonce = 'dr0+:_pij2' # just a sample for testing fixed nonce
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if fixednonce == 0:
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noncelen=10; nonce = create_random_nonce(noncelen)
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else:
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nonce = 'dr0+:_pij2' # just a sample for testing fixed nonce
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else:
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CIPHERNAME = "LC4"
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letters = letters6;
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letters = letters6
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nonce_mode = 1
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marker_mode = 1
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noncelen=6; nonce = create_random_nonce(noncelen)
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# nonce = 'pjpm5i' # just a sample for testing fixed nonce
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if fixednonce == 0:
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noncelen=6; nonce = create_random_nonce(noncelen)
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else:
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nonce = 'pjpm5i' # just a sample for testing fixed nonce
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tiles = list(zip(letters, [(x // size, x % size) for x in range(size * size)]))
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check_nonce(nonce)
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@ -257,7 +287,11 @@ def test1(size):
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print('\n' + CIPHERNAME)
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if size == 7:
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keyword = 's3cret_p4ssw0rd/31337'; args.keywordstring=keyword
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if args.keywordstring:
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keyword = args.keywordstring # Allows to use -ws besides -t
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else:
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keyword = 's3cret_p4ssw0rd/31337'
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szkeyword = keyword # This statement needed to show keyword in printinfo() [don't change args.keywordstring within test1()!]
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key = derive_key(keyword)
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else:
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key = letters
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@ -266,11 +300,13 @@ def test1(size):
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mp = (0, 0)
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if size == 7:
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# signature = 'peace-vector-3' # just to name a meaningful value for size=7
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plaintext = 'conflagrate_the_rose_bush_at_six!'
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signature = 'peace-vector-3'
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if szsignature: plaintext += szsignature
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else:
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# signature = '#its_me' # Notice: with size=6 the chars "#", "0", "1", "-" aren't part of the alphabet
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plaintext = 'its_my_fathers_son_but_not_my_brother'
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signature = '#its_me' # signature = ''
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if szsignature: plaintext += szsignature
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check_plaintext(plaintext)
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ciphertext = encrypt_with_nonce(plaintext)
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@ -280,20 +316,21 @@ def test1(size):
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decryptedtext = decrypt_with_nonce(ciphertext)
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print('decrypted text: ' + decryptedtext)
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printinfo(True)
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args.keywordstring=''
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printinfo(True) # Called from test1() with arg TRUE = assume to do decryption
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szkeyword=''
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if __name__ == '__main__':
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parser = argparse.ArgumentParser()
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parser = argparse.ArgumentParser() # how to enforce, that (either no arg), (or only one arg -t, -v), (or give key and enc mode)
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mgroup = parser.add_mutually_exclusive_group()
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parser.add_argument("-v", "--verbose", help="output additional information on stderr", action="count", default=0)
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mgroup.add_argument("-6", "--lc4", help="use ElsieFour cipher (6x6 table) (default)", action="store_true")
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mgroup.add_argument("-7", "--ls47", help="use LS47 cipher (7x7 table)", action="store_true")
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mgroup1 = parser.add_mutually_exclusive_group()
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mgroup1.add_argument("-6", "--lc4", help="use ElsieFour cipher (6x6 table) (default)", action="store_true")
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mgroup1.add_argument("-7", "--ls47", help="use LS47 cipher (7x7 table)", action="store_true")
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mgroup2 = parser.add_mutually_exclusive_group()
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mgroup2.add_argument("-ks", "--keystring", metavar="STRING", help="use STRING as key")
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@ -301,16 +338,16 @@ if __name__ == '__main__':
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mgroup2.add_argument("-ws", "--keywordstring", metavar="STRING", help="generate key from keyword STRING", default=None)
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mgroup2.add_argument("-wf", "--keywordfile", metavar="FILE", help="read keyword from FILE to generate key", default=None)
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mgroup3 = parser.add_mutually_exclusive_group()
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mgroup3.add_argument("-nl", "--noncelen", metavar="LENGTH", help="use random nonce of length LENGTH", type=int, default=0)
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mgroup3.add_argument("-ns", "--noncestring", metavar="STRING", help="use STRING as nonce")
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mgroup4 = parser.add_mutually_exclusive_group()
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mgroup4.add_argument("-es", "--encryptstring", metavar="STRING", help="encrypt STRING")
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mgroup4.add_argument("-ef", "--encryptfile", metavar="FILE", help="read plaintext from FILE and encrypt it")
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mgroup4.add_argument("-ds", "--decryptstring", metavar="STRING", help="decrypt STRING")
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mgroup4.add_argument("-df", "--decryptfile", metavar="FILE", help="read ciphertext from FILE and decrypt it")
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mgroup4.add_argument("-t", "--test", help="encrypt and decrypt a string with a random nonce and a given key (once with LC4 and once with LS47)", action="store_true")
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mgroup4.add_argument("-t", "--test", help="encrypt and decrypt a string with a given key (four cases: random and fixed nonce, LC4 and LS47)", action="store_true")
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mgroup3 = parser.add_mutually_exclusive_group()
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mgroup3.add_argument("-nl", "--noncelen", metavar="LENGTH", help="use random nonce of length LENGTH (default: no nonce)", type=int, default=0)
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mgroup3.add_argument("-ns", "--noncestring", metavar="STRING", help="use STRING as nonce (default: no nonce)")
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mgroup5 = parser.add_mutually_exclusive_group()
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mgroup5.add_argument("-n0", "--nKaminsky", help="use nonce in Kaminsky mode (default for LC4)", action="store_true")
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@ -320,7 +357,8 @@ if __name__ == '__main__':
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mgroup6.add_argument("-m0", "--mKaminsky", help="use marker in Kaminsky mode (default for LC4)", action="store_true")
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mgroup6.add_argument("-m1", "--mKratochvil", help="use marker in Kratochvil mode (default for LS47)", action="store_true")
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parser.add_argument("-s", "--signature", help="append SIGNATURE to plaintext when encrypting")
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parser.add_argument("-s", "--signature", help="append SIGNATURE to plaintext when encrypting (default: no signature)")
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args = parser.parse_args()
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@ -372,8 +410,19 @@ if __name__ == '__main__':
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key = letters
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# help variables for verbose printing via printinfo()
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szkeyword = '' # global variable which can be changed in test1() [so it can be used as test condition in printinfo() instead of args.keywordstring and instead of test1() manipulating args.keywordstring]
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szsignature = '' # global variable which can be changed in test1() [so it can be used as test condition in printinfo() instead of args.keywordstring and instead of test1() manipulating args.keywordstring]. # Allows to use -s besides -t
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if args.signature: # This case here is only necessary if -s should be used together with -t
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szsignature = args.signature
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if args.keywordfile: args.keywordstring = open(args.keywordfile, 'r').read().rstrip('\r\n')
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if args.keywordstring: key = derive_key(args.keywordstring);
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if args.keywordstring:
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szkeyword = args.keywordstring
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key = derive_key(args.keywordstring)
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if args.keyfile: args.keystring = open(args.keyfile, 'r').read().rstrip('\r\n')
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if args.keystring: key = args.keystring;
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@ -393,29 +442,38 @@ if __name__ == '__main__':
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if args.encryptstring:
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plaintext = args.encryptstring
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if args.signature: plaintext += args.signature
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if args.signature:
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plaintext += args.signature
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check_plaintext(plaintext)
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ciphertext = encrypt_with_nonce(plaintext)
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if args.verbose: printinfo(True)
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print(ciphertext)
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if args.verbose:
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printinfo(True)
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else:
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print(ciphertext)
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elif args.decryptstring:
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ciphertext = args.decryptstring
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check_ciphertext(ciphertext)
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plaintext = decrypt_with_nonce(ciphertext)
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if args.verbose: printinfo()
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if args.signature and args.verbose:
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eprint("Warning: the given signature is ignored during decryption")
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print(plaintext)
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eprint("--Warning--: the given signature is ignored during decryption")
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# Maybe later return result of a check whether given signature equals the end of the decrypted string.
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if args.verbose:
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printinfo()
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else:
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print(plaintext)
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elif args.test:
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print('\nVersion: ' + version)
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print('Test: No nonce provided (only its length), so each call will produce a different ciphertext.')
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size = 7; test1(size)
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size = 6; test1(size)
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print('\n---Test: No nonce provided (only its length), so each call will produce a different ciphertext.')
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size = 7; test1(size, 0)
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size = 6; test1(size, 0)
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print('\n---Test: Nonce provided as string.')
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size = 7; test1(size, 1)
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size = 6; test1(size, 1)
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sys.exit(1)
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else:
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else: # you'll never get here (handled via argparse)
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# if args.verbose: print('Version : ' + version)
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print('ALPHABET : ' + letters)
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print('KEY : ' + initialkey)
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