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des_c.py
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/
des_c.py
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# This file is part of 'NTLM Authorization Proxy Server' http://sourceforge.net/projects/ntlmaps/
# Copyright 2001 Dmitry A. Rozmanov <dima@xenon.spb.ru>
#
# This library is free software: you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation, either
# version 3 of the License, or (at your option) any later version.
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library. If not, see <http://www.gnu.org/licenses/> or <http://www.gnu.org/licenses/lgpl.txt>.
from U32 import U32
# --NON ASCII COMMENT ELIDED--
#typedef unsigned char des_cblock[8];
#define HDRSIZE 4
def c2l(c):
"char[4] to unsigned long"
l = U32(c[0])
l = l | (U32(c[1]) << 8)
l = l | (U32(c[2]) << 16)
l = l | (U32(c[3]) << 24)
return l
def c2ln(c,l1,l2,n):
"char[n] to two unsigned long???"
c = c + n
l1, l2 = U32(0), U32(0)
f = 0
if n == 8:
l2 = l2 | (U32(c[7]) << 24)
f = 1
if f or (n == 7):
l2 = l2 | (U32(c[6]) << 16)
f = 1
if f or (n == 6):
l2 = l2 | (U32(c[5]) << 8)
f = 1
if f or (n == 5):
l2 = l2 | U32(c[4])
f = 1
if f or (n == 4):
l1 = l1 | (U32(c[3]) << 24)
f = 1
if f or (n == 3):
l1 = l1 | (U32(c[2]) << 16)
f = 1
if f or (n == 2):
l1 = l1 | (U32(c[1]) << 8)
f = 1
if f or (n == 1):
l1 = l1 | U32(c[0])
return (l1, l2)
def l2c(l):
"unsigned long to char[4]"
c = []
c.append(int(l & U32(0xFF)))
c.append(int((l >> 8) & U32(0xFF)))
c.append(int((l >> 16) & U32(0xFF)))
c.append(int((l >> 24) & U32(0xFF)))
return c
def n2l(c, l):
"network to host long"
l = U32(c[0] << 24)
l = l | (U32(c[1]) << 16)
l = l | (U32(c[2]) << 8)
l = l | (U32(c[3]))
return l
def l2n(l, c):
"host to network long"
c = []
c.append(int((l >> 24) & U32(0xFF)))
c.append(int((l >> 16) & U32(0xFF)))
c.append(int((l >> 8) & U32(0xFF)))
c.append(int((l ) & U32(0xFF)))
return c
def l2cn(l1, l2, c, n):
""
for i in range(n): c.append(0x00)
f = 0
if f or (n == 8):
c[7] = int((l2 >> 24) & U32(0xFF))
f = 1
if f or (n == 7):
c[6] = int((l2 >> 16) & U32(0xFF))
f = 1
if f or (n == 6):
c[5] = int((l2 >> 8) & U32(0xFF))
f = 1
if f or (n == 5):
c[4] = int((l2 ) & U32(0xFF))
f = 1
if f or (n == 4):
c[3] = int((l1 >> 24) & U32(0xFF))
f = 1
if f or (n == 3):
c[2] = int((l1 >> 16) & U32(0xFF))
f = 1
if f or (n == 2):
c[1] = int((l1 >> 8) & U32(0xFF))
f = 1
if f or (n == 1):
c[0] = int((l1 ) & U32(0xFF))
f = 1
return c[:n]
# array of data
# static unsigned long des_SPtrans[8][64]={
# static unsigned long des_skb[8][64]={
from des_data import des_SPtrans, des_skb
def D_ENCRYPT(tup, u, t, s):
L, R, S = tup
#print 'LRS1', L, R, S, u, t, '-->',
u = (R ^ s[S])
t = R ^ s[S + 1]
t = ((t >> 4) + (t << 28))
L = L ^ (des_SPtrans[1][int((t ) & U32(0x3f))] | \
des_SPtrans[3][int((t >> 8) & U32(0x3f))] | \
des_SPtrans[5][int((t >> 16) & U32(0x3f))] | \
des_SPtrans[7][int((t >> 24) & U32(0x3f))] | \
des_SPtrans[0][int((u ) & U32(0x3f))] | \
des_SPtrans[2][int((u >> 8) & U32(0x3f))] | \
des_SPtrans[4][int((u >> 16) & U32(0x3f))] | \
des_SPtrans[6][int((u >> 24) & U32(0x3f))])
#print 'LRS:', L, R, S, u, t
return ((L, R, S), u, t, s)
def PERM_OP (tup, n, m):
"tup - (a, b, t)"
a, b, t = tup
t = ((a >> n) ^ b) & m
b = b ^ t
a = a ^ (t << n)
return (a, b, t)
def HPERM_OP (tup, n, m):
"tup - (a, t)"
a, t = tup
t = ((a << (16 - n)) ^ a) & m
a = a ^ t ^ (t >> (16 - n))
return (a, t)
shifts2 = [0,0,1,1,1,1,1,1,0,1,1,1,1,1,1,0]
class DES:
KeySched = None # des_key_schedule
def __init__(self, key_str):
# key - UChar[8]
key = []
for i in key_str: key.append(ord(i))
#print 'key:', key
self.KeySched = des_set_key(key)
#print 'schedule:', self.KeySched, len(self.KeySched)
def decrypt(self, str):
# block - UChar[]
block = []
for i in str: block.append(ord(i))
#print block
block = des_ecb_encrypt(block, self.KeySched, 0)
res = ''
for i in block: res = res + (chr(i))
return res
def encrypt(self, str):
# block - UChar[]
block = []
for i in str: block.append(ord(i))
block = des_ecb_encrypt(block, self.KeySched, 1)
res = ''
for i in block: res = res + (chr(i))
return res
#------------------------
def des_encript(input, ks, encrypt):
# input - U32[]
# output - U32[]
# ks - des_key_shedule - U32[2][16]
# encrypt - int
# l, r, t, u - U32
# i - int
# s - U32[]
l = input[0]
r = input[1]
t = U32(0)
u = U32(0)
r, l, t = PERM_OP((r, l, t), 4, U32(0x0f0f0f0fL))
l, r, t = PERM_OP((l, r, t), 16, U32(0x0000ffffL))
r, l, t = PERM_OP((r, l, t), 2, U32(0x33333333L))
l, r, t = PERM_OP((l, r, t), 8, U32(0x00ff00ffL))
r, l, t = PERM_OP((r, l, t), 1, U32(0x55555555L))
t = (r << 1)|(r >> 31)
r = (l << 1)|(l >> 31)
l = t
s = ks # ???????????????
#print l, r
if(encrypt):
for i in range(0, 32, 4):
rtup, u, t, s = D_ENCRYPT((l, r, i + 0), u, t, s)
l = rtup[0]
r = rtup[1]
rtup, u, t, s = D_ENCRYPT((r, l, i + 2), u, t, s)
r = rtup[0]
l = rtup[1]
else:
for i in range(30, 0, -4):
rtup, u, t, s = D_ENCRYPT((l, r, i - 0), u, t, s)
l = rtup[0]
r = rtup[1]
rtup, u, t, s = D_ENCRYPT((r, l, i - 2), u, t, s)
r = rtup[0]
l = rtup[1]
#print l, r
l = (l >> 1)|(l << 31)
r = (r >> 1)|(r << 31)
r, l, t = PERM_OP((r, l, t), 1, U32(0x55555555L))
l, r, t = PERM_OP((l, r, t), 8, U32(0x00ff00ffL))
r, l, t = PERM_OP((r, l, t), 2, U32(0x33333333L))
l, r, t = PERM_OP((l, r, t), 16, U32(0x0000ffffL))
r, l, t = PERM_OP((r, l, t), 4, U32(0x0f0f0f0fL))
output = [l]
output.append(r)
l, r, t, u = U32(0), U32(0), U32(0), U32(0)
return output
def des_ecb_encrypt(input, ks, encrypt):
# input - des_cblock - UChar[8]
# output - des_cblock - UChar[8]
# ks - des_key_shedule - U32[2][16]
# encrypt - int
#print input
l0 = c2l(input[0:4])
l1 = c2l(input[4:8])
ll = [l0]
ll.append(l1)
#print ll
ll = des_encript(ll, ks, encrypt)
#print ll
l0 = ll[0]
l1 = ll[1]
output = l2c(l0)
output = output + l2c(l1)
#print output
l0, l1, ll[0], ll[1] = U32(0), U32(0), U32(0), U32(0)
return output
def des_set_key(key):
# key - des_cblock - UChar[8]
# schedule - des_key_schedule
# register unsigned long c,d,t,s;
# register unsigned char *in;
# register unsigned long *k;
# register int i;
#k = schedule
# in = key
k = []
c = c2l(key[0:4])
d = c2l(key[4:8])
t = U32(0)
d, c, t = PERM_OP((d, c, t), 4, U32(0x0f0f0f0fL))
c, t = HPERM_OP((c, t), -2, U32(0xcccc0000L))
d, t = HPERM_OP((d, t), -2, U32(0xcccc0000L))
d, c, t = PERM_OP((d, c, t), 1, U32(0x55555555L))
c, d, t = PERM_OP((c, d, t), 8, U32(0x00ff00ffL))
d, c, t = PERM_OP((d, c, t), 1, U32(0x55555555L))
d = (((d & U32(0x000000ffL)) << 16)|(d & U32(0x0000ff00L))|((d & U32(0x00ff0000L)) >> 16)|((c & U32(0xf0000000L)) >> 4))
c = c & U32(0x0fffffffL)
for i in range(16):
if (shifts2[i]):
c = ((c >> 2)|(c << 26))
d = ((d >> 2)|(d << 26))
else:
c = ((c >> 1)|(c << 27))
d = ((d >> 1)|(d << 27))
c = c & U32(0x0fffffffL)
d = d & U32(0x0fffffffL)
s= des_skb[0][int((c ) & U32(0x3f))]|\
des_skb[1][int(((c>> 6) & U32(0x03))|((c>> 7) & U32(0x3c)))]|\
des_skb[2][int(((c>>13) & U32(0x0f))|((c>>14) & U32(0x30)))]|\
des_skb[3][int(((c>>20) & U32(0x01))|((c>>21) & U32(0x06)) | ((c>>22) & U32(0x38)))]
t= des_skb[4][int((d ) & U32(0x3f) )]|\
des_skb[5][int(((d>> 7) & U32(0x03))|((d>> 8) & U32(0x3c)))]|\
des_skb[6][int((d>>15) & U32(0x3f) )]|\
des_skb[7][int(((d>>21) & U32(0x0f))|((d>>22) & U32(0x30)))]
#print s, t
k.append(((t << 16)|(s & U32(0x0000ffffL))) & U32(0xffffffffL))
s = ((s >> 16)|(t & U32(0xffff0000L)))
s = (s << 4)|(s >> 28)
k.append(s & U32(0xffffffffL))
schedule = k
return schedule