mirror of
https://github.com/login-securite/DonPAPI
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392 lines
13 KiB
Python
392 lines
13 KiB
Python
#!/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 = [0o1, 0o2, 0o4, 0o10, 0o20, 0o40, 0o100, 0o200] # 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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0x800000, 0x400000, 0x200000, 0x100000,
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0x80000, 0x40000, 0x20000, 0x10000,
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0x8000, 0x4000, 0x2000, 0x1000,
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0x800, 0x400, 0x200, 0x100,
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0x80, 0x40, 0x20, 0x10,
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0x8, 0x4, 0x2, 0x1
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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 = [0]*32
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for j in range(56):
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l = pc1[j]
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m = l & 0o7
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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] = 0
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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 & 0x00fc0000) << 6
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k |= (raw0 & 0x00000fc0) << 10
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k |= (raw1 & 0x00fc0000) >> 10
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k |= (raw1 & 0x00000fc0) >> 6
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key.append(k)
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k = (raw0 & 0x0003f000) << 12
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k |= (raw0 & 0x0000003f) << 16
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k |= (raw1 & 0x0003f000) >> 4
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k |= (raw1 & 0x0000003f)
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key.append(k)
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return key
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SP1 = [
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0x01010400, 0x00000000, 0x00010000, 0x01010404,
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0x01010004, 0x00010404, 0x00000004, 0x00010000,
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0x00000400, 0x01010400, 0x01010404, 0x00000400,
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0x01000404, 0x01010004, 0x01000000, 0x00000004,
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0x00000404, 0x01000400, 0x01000400, 0x00010400,
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0x00010400, 0x01010000, 0x01010000, 0x01000404,
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0x00010004, 0x01000004, 0x01000004, 0x00010004,
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0x00000000, 0x00000404, 0x00010404, 0x01000000,
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0x00010000, 0x01010404, 0x00000004, 0x01010000,
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0x01010400, 0x01000000, 0x01000000, 0x00000400,
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0x01010004, 0x00010000, 0x00010400, 0x01000004,
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0x00000400, 0x00000004, 0x01000404, 0x00010404,
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0x01010404, 0x00010004, 0x01010000, 0x01000404,
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0x01000004, 0x00000404, 0x00010404, 0x01010400,
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0x00000404, 0x01000400, 0x01000400, 0x00000000,
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0x00010004, 0x00010400, 0x00000000, 0x01010004
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]
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SP2 = [
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0x80108020, 0x80008000, 0x00008000, 0x00108020,
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0x00100000, 0x00000020, 0x80100020, 0x80008020,
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0x80000020, 0x80108020, 0x80108000, 0x80000000,
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0x80008000, 0x00100000, 0x00000020, 0x80100020,
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0x00108000, 0x00100020, 0x80008020, 0x00000000,
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0x80000000, 0x00008000, 0x00108020, 0x80100000,
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0x00100020, 0x80000020, 0x00000000, 0x00108000,
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0x00008020, 0x80108000, 0x80100000, 0x00008020,
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0x00000000, 0x00108020, 0x80100020, 0x00100000,
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0x80008020, 0x80100000, 0x80108000, 0x00008000,
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0x80100000, 0x80008000, 0x00000020, 0x80108020,
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0x00108020, 0x00000020, 0x00008000, 0x80000000,
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0x00008020, 0x80108000, 0x00100000, 0x80000020,
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0x00100020, 0x80008020, 0x80000020, 0x00100020,
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0x00108000, 0x00000000, 0x80008000, 0x00008020,
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0x80000000, 0x80100020, 0x80108020, 0x00108000
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]
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SP3 = [
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0x00000208, 0x08020200, 0x00000000, 0x08020008,
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0x08000200, 0x00000000, 0x00020208, 0x08000200,
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0x00020008, 0x08000008, 0x08000008, 0x00020000,
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0x08020208, 0x00020008, 0x08020000, 0x00000208,
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0x08000000, 0x00000008, 0x08020200, 0x00000200,
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0x00020200, 0x08020000, 0x08020008, 0x00020208,
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0x08000208, 0x00020200, 0x00020000, 0x08000208,
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0x00000008, 0x08020208, 0x00000200, 0x08000000,
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0x08020200, 0x08000000, 0x00020008, 0x00000208,
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0x00020000, 0x08020200, 0x08000200, 0x00000000,
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0x00000200, 0x00020008, 0x08020208, 0x08000200,
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0x08000008, 0x00000200, 0x00000000, 0x08020008,
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0x08000208, 0x00020000, 0x08000000, 0x08020208,
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0x00000008, 0x00020208, 0x00020200, 0x08000008,
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0x08020000, 0x08000208, 0x00000208, 0x08020000,
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0x00020208, 0x00000008, 0x08020008, 0x00020200
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]
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SP4 = [
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0x00802001, 0x00002081, 0x00002081, 0x00000080,
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0x00802080, 0x00800081, 0x00800001, 0x00002001,
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0x00000000, 0x00802000, 0x00802000, 0x00802081,
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0x00000081, 0x00000000, 0x00800080, 0x00800001,
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0x00000001, 0x00002000, 0x00800000, 0x00802001,
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0x00000080, 0x00800000, 0x00002001, 0x00002080,
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0x00800081, 0x00000001, 0x00002080, 0x00800080,
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0x00002000, 0x00802080, 0x00802081, 0x00000081,
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0x00800080, 0x00800001, 0x00802000, 0x00802081,
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0x00000081, 0x00000000, 0x00000000, 0x00802000,
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0x00002080, 0x00800080, 0x00800081, 0x00000001,
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0x00802001, 0x00002081, 0x00002081, 0x00000080,
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0x00802081, 0x00000081, 0x00000001, 0x00002000,
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0x00800001, 0x00002001, 0x00802080, 0x00800081,
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0x00002001, 0x00002080, 0x00800000, 0x00802001,
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0x00000080, 0x00800000, 0x00002000, 0x00802080
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]
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SP5 = [
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0x00000100, 0x02080100, 0x02080000, 0x42000100,
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0x00080000, 0x00000100, 0x40000000, 0x02080000,
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0x40080100, 0x00080000, 0x02000100, 0x40080100,
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0x42000100, 0x42080000, 0x00080100, 0x40000000,
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0x02000000, 0x40080000, 0x40080000, 0x00000000,
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0x40000100, 0x42080100, 0x42080100, 0x02000100,
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0x42080000, 0x40000100, 0x00000000, 0x42000000,
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0x02080100, 0x02000000, 0x42000000, 0x00080100,
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0x00080000, 0x42000100, 0x00000100, 0x02000000,
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0x40000000, 0x02080000, 0x42000100, 0x40080100,
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0x02000100, 0x40000000, 0x42080000, 0x02080100,
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0x40080100, 0x00000100, 0x02000000, 0x42080000,
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0x42080100, 0x00080100, 0x42000000, 0x42080100,
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0x02080000, 0x00000000, 0x40080000, 0x42000000,
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0x00080100, 0x02000100, 0x40000100, 0x00080000,
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0x00000000, 0x40080000, 0x02080100, 0x40000100
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]
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SP6 = [
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0x20000010, 0x20400000, 0x00004000, 0x20404010,
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0x20400000, 0x00000010, 0x20404010, 0x00400000,
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0x20004000, 0x00404010, 0x00400000, 0x20000010,
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0x00400010, 0x20004000, 0x20000000, 0x00004010,
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0x00000000, 0x00400010, 0x20004010, 0x00004000,
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0x00404000, 0x20004010, 0x00000010, 0x20400010,
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0x20400010, 0x00000000, 0x00404010, 0x20404000,
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0x00004010, 0x00404000, 0x20404000, 0x20000000,
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0x20004000, 0x00000010, 0x20400010, 0x00404000,
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0x20404010, 0x00400000, 0x00004010, 0x20000010,
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0x00400000, 0x20004000, 0x20000000, 0x00004010,
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0x20000010, 0x20404010, 0x00404000, 0x20400000,
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0x00404010, 0x20404000, 0x00000000, 0x20400010,
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0x00000010, 0x00004000, 0x20400000, 0x00404010,
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0x00004000, 0x00400010, 0x20004010, 0x00000000,
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0x20404000, 0x20000000, 0x00400010, 0x20004010
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]
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SP7 = [
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0x00200000, 0x04200002, 0x04000802, 0x00000000,
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0x00000800, 0x04000802, 0x00200802, 0x04200800,
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0x04200802, 0x00200000, 0x00000000, 0x04000002,
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0x00000002, 0x04000000, 0x04200002, 0x00000802,
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0x04000800, 0x00200802, 0x00200002, 0x04000800,
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0x04000002, 0x04200000, 0x04200800, 0x00200002,
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0x04200000, 0x00000800, 0x00000802, 0x04200802,
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0x00200800, 0x00000002, 0x04000000, 0x00200800,
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0x04000000, 0x00200800, 0x00200000, 0x04000802,
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0x04000802, 0x04200002, 0x04200002, 0x00000002,
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0x00200002, 0x04000000, 0x04000800, 0x00200000,
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0x04200800, 0x00000802, 0x00200802, 0x04200800,
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0x00000802, 0x04000002, 0x04200802, 0x04200000,
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0x00200800, 0x00000000, 0x00000002, 0x04200802,
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0x00000000, 0x00200802, 0x04200000, 0x00000800,
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0x04000002, 0x04000800, 0x00000800, 0x00200002
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]
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SP8 = [
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0x10001040, 0x00001000, 0x00040000, 0x10041040,
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0x10000000, 0x10001040, 0x00000040, 0x10000000,
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0x00040040, 0x10040000, 0x10041040, 0x00041000,
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0x10041000, 0x00041040, 0x00001000, 0x00000040,
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0x10040000, 0x10000040, 0x10001000, 0x00001040,
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0x00041000, 0x00040040, 0x10040040, 0x10041000,
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0x00001040, 0x00000000, 0x00000000, 0x10040040,
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0x10000040, 0x10001000, 0x00041040, 0x00040000,
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0x00041040, 0x00040000, 0x10041000, 0x00001000,
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0x00000040, 0x10040040, 0x00001000, 0x00041040,
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0x10001000, 0x00000040, 0x10000040, 0x10040000,
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0x10040040, 0x10000000, 0x00040000, 0x10001040,
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0x00000000, 0x10041040, 0x00040040, 0x10000040,
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0x10040000, 0x10001000, 0x10001040, 0x00000000,
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0x10041040, 0x00041000, 0x00041000, 0x00001040,
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0x00001040, 0x00040040, 0x10000000, 0x10041000
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]
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def desfunc(block, keys):
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(leftt, right) = unpack('>II', block)
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work = ((leftt >> 4) ^ right) & 0x0f0f0f0f
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right ^= work
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leftt ^= (work << 4)
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work = ((leftt >> 16) ^ right) & 0x0000ffff
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right ^= work
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leftt ^= (work << 16)
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work = ((right >> 2) ^ leftt) & 0x33333333
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leftt ^= work
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right ^= (work << 2)
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work = ((right >> 8) ^ leftt) & 0x00ff00ff
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leftt ^= work
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right ^= (work << 8)
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right = ((right << 1) | ((right >> 31) & 1)) & 0xffffffff
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work = (leftt ^ right) & 0xaaaaaaaa
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leftt ^= work
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right ^= work
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leftt = ((leftt << 1) | ((leftt >> 31) & 1)) & 0xffffffff
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for i in range(0, 32, 4):
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work = (right << 28) | (right >> 4)
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work ^= keys[i]
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fval = SP7[work & 0x3f]
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fval |= SP5[(work >> 8) & 0x3f]
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fval |= SP3[(work >> 16) & 0x3f]
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fval |= SP1[(work >> 24) & 0x3f]
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work = right ^ keys[i+1]
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fval |= SP8[work & 0x3f]
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fval |= SP6[(work >> 8) & 0x3f]
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fval |= SP4[(work >> 16) & 0x3f]
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fval |= SP2[(work >> 24) & 0x3f]
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leftt ^= fval
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work = (leftt << 28) | (leftt >> 4)
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work ^= keys[i+2]
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fval = SP7[work & 0x3f]
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fval |= SP5[(work >> 8) & 0x3f]
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fval |= SP3[(work >> 16) & 0x3f]
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fval |= SP1[(work >> 24) & 0x3f]
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work = leftt ^ keys[i+3]
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fval |= SP8[work & 0x3f]
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fval |= SP6[(work >> 8) & 0x3f]
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fval |= SP4[(work >> 16) & 0x3f]
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fval |= SP2[(work >> 24) & 0x3f]
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right ^= fval
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right = (right << 31) | (right >> 1)
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work = (leftt ^ right) & 0xaaaaaaaa
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leftt ^= work
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right ^= work
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leftt = (leftt << 31) | (leftt >> 1)
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work = ((leftt >> 8) ^ right) & 0x00ff00ff
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right ^= work
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leftt ^= (work << 8)
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work = ((leftt >> 2) ^ right) & 0x33333333
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right ^= work
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leftt ^= (work << 2)
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work = ((right >> 16) ^ leftt) & 0x0000ffff
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leftt ^= work
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right ^= (work << 16)
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work = ((right >> 4) ^ leftt) & 0x0f0f0f0f
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leftt ^= work
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right ^= (work << 4)
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leftt &= 0xffffffff
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right &= 0xffffffff
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return pack('>II', right, leftt)
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# test
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if __name__ == '__main__':
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import binascii
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key = binascii.unhexlify('0123456789abcdef')
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plain = binascii.unhexlify('0123456789abcdef')
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cipher = binascii.unhexlify('6e09a37726dd560c')
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ek = deskey(key, False)
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dk = deskey(key, True)
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assert desfunc(plain, ek) == cipher
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assert desfunc(desfunc(plain, ek), dk) == plain
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assert desfunc(desfunc(plain, dk), ek) == plain
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print('test succeeded.')
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