root / vncauthproxy / d3des.py @ 07b0130f
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#!/usr/bin/env python
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##
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## d3des.py - DES implementation
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##
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## Copyright (c) 2009 by Yusuke Shinyama
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##
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# This is a Python rewrite of d3des.c by Richard Outerbridge.
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#
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# I referred to the original VNC viewer code for the changes that
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# is necessary to maintain the exact behavior of the VNC protocol.
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# Two constants and two functions were added to the original d3des
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# code. These added parts were written in Python and marked
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# below. I believe that the added parts do not make this program
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# a "derivative work" of the VNC viewer (which is GPL'ed and
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# written in C), but if there's any problem, let me know.
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#
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# Yusuke Shinyama (yusuke at cs dot nyu dot edu)
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# D3DES (V5.09) -
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#
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# A portable, public domain, version of the Data Encryption Standard.
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#
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# Written with Symantec's THINK (Lightspeed) C by Richard Outerbridge.
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# Thanks to: Dan Hoey for his excellent Initial and Inverse permutation
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# code; Jim Gillogly & Phil Karn for the DES key schedule code; Dennis
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# Ferguson, Eric Young and Dana How for comparing notes; and Ray Lau,
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# for humouring me on.
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#
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# Copyright (c) 1988,1989,1990,1991,1992 by Richard Outerbridge.
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# (GEnie : OUTER; CIS : [71755,204]) Graven Imagery, 1992.
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#
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from struct import pack, unpack |
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###################################################
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###
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### start: changes made for VNC.
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###
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# This constant was taken from vncviewer/rfb/vncauth.c:
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vnckey = [ 23,82,107,6,35,78,88,7 ] |
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# This is a departure from the original code.
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#bytebit = [ 0200, 0100, 040, 020, 010, 04, 02, 01 ] # original
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bytebit = [ 01, 02, 04, 010, 020, 040, 0100, 0200 ] # VNC version |
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# two password functions for VNC protocol.
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def decrypt_passwd(data): |
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dk = deskey(pack('8B', *vnckey), True) |
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return desfunc(data, dk)
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def generate_response(passwd, challange): |
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ek = deskey((passwd+'\x00'*8)[:8], False) |
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return desfunc(challange[:8], ek) + desfunc(challange[8:], ek) |
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###
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### end: changes made for VNC.
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###
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###################################################
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bigbyte = [ |
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0x800000L, 0x400000L, 0x200000L, 0x100000L, |
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0x80000L, 0x40000L, 0x20000L, 0x10000L, |
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0x8000L, 0x4000L, 0x2000L, 0x1000L, |
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0x800L, 0x400L, 0x200L, 0x100L, |
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0x80L, 0x40L, 0x20L, 0x10L, |
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0x8L, 0x4L, 0x2L, 0x1L |
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] |
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# Use the key schedule specified in the Standard (ANSI X3.92-1981).
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pc1 = [ |
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56, 48, 40, 32, 24, 16, 8, 0, 57, 49, 41, 33, 25, 17, |
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9, 1, 58, 50, 42, 34, 26, 18, 10, 2, 59, 51, 43, 35, |
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62, 54, 46, 38, 30, 22, 14, 6, 61, 53, 45, 37, 29, 21, |
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13, 5, 60, 52, 44, 36, 28, 20, 12, 4, 27, 19, 11, 3 |
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] |
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totrot = [ 1,2,4,6,8,10,12,14,15,17,19,21,23,25,27,28 ] |
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pc2 = [ |
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13, 16, 10, 23, 0, 4, 2, 27, 14, 5, 20, 9, |
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22, 18, 11, 3, 25, 7, 15, 6, 26, 19, 12, 1, |
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40, 51, 30, 36, 46, 54, 29, 39, 50, 44, 32, 47, |
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43, 48, 38, 55, 33, 52, 45, 41, 49, 35, 28, 31 |
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] |
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def deskey(key, decrypt): # Thanks to James Gillogly & Phil Karn! |
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key = unpack('8B', key)
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pc1m = [0]*56 |
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pcr = [0]*56 |
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kn = [0L]*32 |
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for j in range(56): |
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l = pc1[j] |
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m = l & 07
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if key[l >> 3] & bytebit[m]: |
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pc1m[j] = 1
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else:
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pc1m[j] = 0
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for i in range(16): |
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if decrypt:
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m = (15 - i) << 1 |
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else:
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m = i << 1
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n = m + 1
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kn[m] = kn[n] = 0L
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for j in range(28): |
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l = j + totrot[i] |
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if l < 28: |
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pcr[j] = pc1m[l] |
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else:
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pcr[j] = pc1m[l - 28]
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for j in range(28, 56): |
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l = j + totrot[i] |
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if l < 56: |
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pcr[j] = pc1m[l] |
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else:
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pcr[j] = pc1m[l - 28]
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for j in range(24): |
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if pcr[pc2[j]]:
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kn[m] |= bigbyte[j] |
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if pcr[pc2[j+24]]: |
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kn[n] |= bigbyte[j] |
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return cookey(kn)
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def cookey(raw): |
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key = [] |
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for i in range(0, 32, 2): |
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(raw0, raw1) = (raw[i], raw[i+1])
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k = (raw0 & 0x00fc0000L) << 6 |
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k |= (raw0 & 0x00000fc0L) << 10 |
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k |= (raw1 & 0x00fc0000L) >> 10 |
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k |= (raw1 & 0x00000fc0L) >> 6 |
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key.append(k) |
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k = (raw0 & 0x0003f000L) << 12 |
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k |= (raw0 & 0x0000003fL) << 16 |
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k |= (raw1 & 0x0003f000L) >> 4 |
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k |= (raw1 & 0x0000003fL)
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key.append(k) |
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return key
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SP1 = [ |
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0x01010400L, 0x00000000L, 0x00010000L, 0x01010404L, |
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0x01010004L, 0x00010404L, 0x00000004L, 0x00010000L, |
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0x00000400L, 0x01010400L, 0x01010404L, 0x00000400L, |
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0x01000404L, 0x01010004L, 0x01000000L, 0x00000004L, |
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0x00000404L, 0x01000400L, 0x01000400L, 0x00010400L, |
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0x00010400L, 0x01010000L, 0x01010000L, 0x01000404L, |
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0x00010004L, 0x01000004L, 0x01000004L, 0x00010004L, |
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0x00000000L, 0x00000404L, 0x00010404L, 0x01000000L, |
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0x00010000L, 0x01010404L, 0x00000004L, 0x01010000L, |
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0x01010400L, 0x01000000L, 0x01000000L, 0x00000400L, |
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0x01010004L, 0x00010000L, 0x00010400L, 0x01000004L, |
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0x00000400L, 0x00000004L, 0x01000404L, 0x00010404L, |
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0x01010404L, 0x00010004L, 0x01010000L, 0x01000404L, |
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0x01000004L, 0x00000404L, 0x00010404L, 0x01010400L, |
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0x00000404L, 0x01000400L, 0x01000400L, 0x00000000L, |
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0x00010004L, 0x00010400L, 0x00000000L, 0x01010004L |
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] |
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SP2 = [ |
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0x80108020L, 0x80008000L, 0x00008000L, 0x00108020L, |
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0x00100000L, 0x00000020L, 0x80100020L, 0x80008020L, |
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0x80000020L, 0x80108020L, 0x80108000L, 0x80000000L, |
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0x80008000L, 0x00100000L, 0x00000020L, 0x80100020L, |
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0x00108000L, 0x00100020L, 0x80008020L, 0x00000000L, |
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0x80000000L, 0x00008000L, 0x00108020L, 0x80100000L, |
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0x00100020L, 0x80000020L, 0x00000000L, 0x00108000L, |
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0x00008020L, 0x80108000L, 0x80100000L, 0x00008020L, |
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0x00000000L, 0x00108020L, 0x80100020L, 0x00100000L, |
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0x80008020L, 0x80100000L, 0x80108000L, 0x00008000L, |
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0x80100000L, 0x80008000L, 0x00000020L, 0x80108020L, |
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0x00108020L, 0x00000020L, 0x00008000L, 0x80000000L, |
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0x00008020L, 0x80108000L, 0x00100000L, 0x80000020L, |
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0x00100020L, 0x80008020L, 0x80000020L, 0x00100020L, |
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0x00108000L, 0x00000000L, 0x80008000L, 0x00008020L, |
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0x80000000L, 0x80100020L, 0x80108020L, 0x00108000L |
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] |
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SP3 = [ |
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0x00000208L, 0x08020200L, 0x00000000L, 0x08020008L, |
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0x08000200L, 0x00000000L, 0x00020208L, 0x08000200L, |
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0x00020008L, 0x08000008L, 0x08000008L, 0x00020000L, |
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0x08020208L, 0x00020008L, 0x08020000L, 0x00000208L, |
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0x08000000L, 0x00000008L, 0x08020200L, 0x00000200L, |
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0x00020200L, 0x08020000L, 0x08020008L, 0x00020208L, |
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0x08000208L, 0x00020200L, 0x00020000L, 0x08000208L, |
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0x00000008L, 0x08020208L, 0x00000200L, 0x08000000L, |
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0x08020200L, 0x08000000L, 0x00020008L, 0x00000208L, |
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0x00020000L, 0x08020200L, 0x08000200L, 0x00000000L, |
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0x00000200L, 0x00020008L, 0x08020208L, 0x08000200L, |
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0x08000008L, 0x00000200L, 0x00000000L, 0x08020008L, |
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0x08000208L, 0x00020000L, 0x08000000L, 0x08020208L, |
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0x00000008L, 0x00020208L, 0x00020200L, 0x08000008L, |
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0x08020000L, 0x08000208L, 0x00000208L, 0x08020000L, |
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0x00020208L, 0x00000008L, 0x08020008L, 0x00020200L |
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] |
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SP4 = [ |
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0x00802001L, 0x00002081L, 0x00002081L, 0x00000080L, |
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0x00802080L, 0x00800081L, 0x00800001L, 0x00002001L, |
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0x00000000L, 0x00802000L, 0x00802000L, 0x00802081L, |
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0x00000081L, 0x00000000L, 0x00800080L, 0x00800001L, |
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0x00000001L, 0x00002000L, 0x00800000L, 0x00802001L, |
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0x00000080L, 0x00800000L, 0x00002001L, 0x00002080L, |
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0x00800081L, 0x00000001L, 0x00002080L, 0x00800080L, |
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0x00002000L, 0x00802080L, 0x00802081L, 0x00000081L, |
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0x00800080L, 0x00800001L, 0x00802000L, 0x00802081L, |
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0x00000081L, 0x00000000L, 0x00000000L, 0x00802000L, |
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0x00002080L, 0x00800080L, 0x00800081L, 0x00000001L, |
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0x00802001L, 0x00002081L, 0x00002081L, 0x00000080L, |
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0x00802081L, 0x00000081L, 0x00000001L, 0x00002000L, |
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0x00800001L, 0x00002001L, 0x00802080L, 0x00800081L, |
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0x00002001L, 0x00002080L, 0x00800000L, 0x00802001L, |
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0x00000080L, 0x00800000L, 0x00002000L, 0x00802080L |
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] |
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|
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SP5 = [ |
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0x00000100L, 0x02080100L, 0x02080000L, 0x42000100L, |
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0x00080000L, 0x00000100L, 0x40000000L, 0x02080000L, |
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0x40080100L, 0x00080000L, 0x02000100L, 0x40080100L, |
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0x42000100L, 0x42080000L, 0x00080100L, 0x40000000L, |
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0x02000000L, 0x40080000L, 0x40080000L, 0x00000000L, |
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0x40000100L, 0x42080100L, 0x42080100L, 0x02000100L, |
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0x42080000L, 0x40000100L, 0x00000000L, 0x42000000L, |
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0x02080100L, 0x02000000L, 0x42000000L, 0x00080100L, |
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0x00080000L, 0x42000100L, 0x00000100L, 0x02000000L, |
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0x40000000L, 0x02080000L, 0x42000100L, 0x40080100L, |
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0x02000100L, 0x40000000L, 0x42080000L, 0x02080100L, |
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0x40080100L, 0x00000100L, 0x02000000L, 0x42080000L, |
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0x42080100L, 0x00080100L, 0x42000000L, 0x42080100L, |
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0x02080000L, 0x00000000L, 0x40080000L, 0x42000000L, |
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0x00080100L, 0x02000100L, 0x40000100L, 0x00080000L, |
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0x00000000L, 0x40080000L, 0x02080100L, 0x40000100L |
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] |
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|
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SP6 = [ |
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0x20000010L, 0x20400000L, 0x00004000L, 0x20404010L, |
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0x20400000L, 0x00000010L, 0x20404010L, 0x00400000L, |
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0x20004000L, 0x00404010L, 0x00400000L, 0x20000010L, |
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0x00400010L, 0x20004000L, 0x20000000L, 0x00004010L, |
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0x00000000L, 0x00400010L, 0x20004010L, 0x00004000L, |
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0x00404000L, 0x20004010L, 0x00000010L, 0x20400010L, |
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0x20400010L, 0x00000000L, 0x00404010L, 0x20404000L, |
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0x00004010L, 0x00404000L, 0x20404000L, 0x20000000L, |
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0x20004000L, 0x00000010L, 0x20400010L, 0x00404000L, |
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0x20404010L, 0x00400000L, 0x00004010L, 0x20000010L, |
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0x00400000L, 0x20004000L, 0x20000000L, 0x00004010L, |
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0x20000010L, 0x20404010L, 0x00404000L, 0x20400000L, |
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0x00404010L, 0x20404000L, 0x00000000L, 0x20400010L, |
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0x00000010L, 0x00004000L, 0x20400000L, 0x00404010L, |
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0x00004000L, 0x00400010L, 0x20004010L, 0x00000000L, |
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0x20404000L, 0x20000000L, 0x00400010L, 0x20004010L |
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] |
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|
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SP7 = [ |
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0x00200000L, 0x04200002L, 0x04000802L, 0x00000000L, |
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0x00000800L, 0x04000802L, 0x00200802L, 0x04200800L, |
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0x04200802L, 0x00200000L, 0x00000000L, 0x04000002L, |
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0x00000002L, 0x04000000L, 0x04200002L, 0x00000802L, |
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0x04000800L, 0x00200802L, 0x00200002L, 0x04000800L, |
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0x04000002L, 0x04200000L, 0x04200800L, 0x00200002L, |
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0x04200000L, 0x00000800L, 0x00000802L, 0x04200802L, |
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0x00200800L, 0x00000002L, 0x04000000L, 0x00200800L, |
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0x04000000L, 0x00200800L, 0x00200000L, 0x04000802L, |
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0x04000802L, 0x04200002L, 0x04200002L, 0x00000002L, |
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0x00200002L, 0x04000000L, 0x04000800L, 0x00200000L, |
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0x04200800L, 0x00000802L, 0x00200802L, 0x04200800L, |
| 277 |
0x00000802L, 0x04000002L, 0x04200802L, 0x04200000L, |
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0x00200800L, 0x00000000L, 0x00000002L, 0x04200802L, |
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0x00000000L, 0x00200802L, 0x04200000L, 0x00000800L, |
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0x04000002L, 0x04000800L, 0x00000800L, 0x00200002L |
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] |
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|
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SP8 = [ |
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0x10001040L, 0x00001000L, 0x00040000L, 0x10041040L, |
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0x10000000L, 0x10001040L, 0x00000040L, 0x10000000L, |
| 286 |
0x00040040L, 0x10040000L, 0x10041040L, 0x00041000L, |
| 287 |
0x10041000L, 0x00041040L, 0x00001000L, 0x00000040L, |
| 288 |
0x10040000L, 0x10000040L, 0x10001000L, 0x00001040L, |
| 289 |
0x00041000L, 0x00040040L, 0x10040040L, 0x10041000L, |
| 290 |
0x00001040L, 0x00000000L, 0x00000000L, 0x10040040L, |
| 291 |
0x10000040L, 0x10001000L, 0x00041040L, 0x00040000L, |
| 292 |
0x00041040L, 0x00040000L, 0x10041000L, 0x00001000L, |
| 293 |
0x00000040L, 0x10040040L, 0x00001000L, 0x00041040L, |
| 294 |
0x10001000L, 0x00000040L, 0x10000040L, 0x10040000L, |
| 295 |
0x10040040L, 0x10000000L, 0x00040000L, 0x10001040L, |
| 296 |
0x00000000L, 0x10041040L, 0x00040040L, 0x10000040L, |
| 297 |
0x10040000L, 0x10001000L, 0x10001040L, 0x00000000L, |
| 298 |
0x10041040L, 0x00041000L, 0x00041000L, 0x00001040L, |
| 299 |
0x00001040L, 0x00040040L, 0x10000000L, 0x10041000L |
| 300 |
] |
| 301 |
|
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def desfunc(block, keys): |
| 303 |
(leftt, right) = unpack('>II', block)
|
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|
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work = ((leftt >> 4) ^ right) & 0x0f0f0f0fL |
| 306 |
right ^= work |
| 307 |
leftt ^= (work << 4)
|
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work = ((leftt >> 16) ^ right) & 0x0000ffffL |
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right ^= work |
| 310 |
leftt ^= (work << 16)
|
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work = ((right >> 2) ^ leftt) & 0x33333333L |
| 312 |
leftt ^= work |
| 313 |
right ^= (work << 2)
|
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work = ((right >> 8) ^ leftt) & 0x00ff00ffL |
| 315 |
leftt ^= work |
| 316 |
right ^= (work << 8)
|
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right = ((right << 1) | ((right >> 31) & 1L)) & 0xffffffffL |
| 318 |
work = (leftt ^ right) & 0xaaaaaaaaL
|
| 319 |
leftt ^= work |
| 320 |
right ^= work |
| 321 |
leftt = ((leftt << 1) | ((leftt >> 31) & 1L)) & 0xffffffffL |
| 322 |
|
| 323 |
for i in range(0, 32, 4): |
| 324 |
work = (right << 28) | (right >> 4) |
| 325 |
work ^= keys[i] |
| 326 |
fval = SP7[ work & 0x3fL]
|
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fval |= SP5[(work >> 8) & 0x3fL] |
| 328 |
fval |= SP3[(work >> 16) & 0x3fL] |
| 329 |
fval |= SP1[(work >> 24) & 0x3fL] |
| 330 |
work = right ^ keys[i+1]
|
| 331 |
fval |= SP8[ work & 0x3fL]
|
| 332 |
fval |= SP6[(work >> 8) & 0x3fL] |
| 333 |
fval |= SP4[(work >> 16) & 0x3fL] |
| 334 |
fval |= SP2[(work >> 24) & 0x3fL] |
| 335 |
leftt ^= fval |
| 336 |
work = (leftt << 28) | (leftt >> 4) |
| 337 |
work ^= keys[i+2]
|
| 338 |
fval = SP7[ work & 0x3fL]
|
| 339 |
fval |= SP5[(work >> 8) & 0x3fL] |
| 340 |
fval |= SP3[(work >> 16) & 0x3fL] |
| 341 |
fval |= SP1[(work >> 24) & 0x3fL] |
| 342 |
work = leftt ^ keys[i+3]
|
| 343 |
fval |= SP8[ work & 0x3fL]
|
| 344 |
fval |= SP6[(work >> 8) & 0x3fL] |
| 345 |
fval |= SP4[(work >> 16) & 0x3fL] |
| 346 |
fval |= SP2[(work >> 24) & 0x3fL] |
| 347 |
right ^= fval |
| 348 |
|
| 349 |
right = (right << 31) | (right >> 1) |
| 350 |
work = (leftt ^ right) & 0xaaaaaaaaL
|
| 351 |
leftt ^= work |
| 352 |
right ^= work |
| 353 |
leftt = (leftt << 31) | (leftt >> 1) |
| 354 |
work = ((leftt >> 8) ^ right) & 0x00ff00ffL |
| 355 |
right ^= work |
| 356 |
leftt ^= (work << 8)
|
| 357 |
work = ((leftt >> 2) ^ right) & 0x33333333L |
| 358 |
right ^= work |
| 359 |
leftt ^= (work << 2)
|
| 360 |
work = ((right >> 16) ^ leftt) & 0x0000ffffL |
| 361 |
leftt ^= work |
| 362 |
right ^= (work << 16)
|
| 363 |
work = ((right >> 4) ^ leftt) & 0x0f0f0f0fL |
| 364 |
leftt ^= work |
| 365 |
right ^= (work << 4)
|
| 366 |
|
| 367 |
leftt &= 0xffffffffL
|
| 368 |
right &= 0xffffffffL
|
| 369 |
return pack('>II', right, leftt) |
| 370 |
|
| 371 |
|
| 372 |
# test
|
| 373 |
if __name__ == '__main__': |
| 374 |
key = '0123456789abcdef'.decode('hex') |
| 375 |
plain = '0123456789abcdef'.decode('hex') |
| 376 |
cipher = '6e09a37726dd560c'.decode('hex') |
| 377 |
ek = deskey(key, False)
|
| 378 |
dk = deskey(key, True)
|
| 379 |
assert desfunc(plain, ek) == cipher
|
| 380 |
assert desfunc(desfunc(plain, ek), dk) == plain
|
| 381 |
assert desfunc(desfunc(plain, dk), ek) == plain
|
| 382 |
print 'test succeeded.' |