255 lines
7 KiB
Python
255 lines
7 KiB
Python
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# This file is part of 'NTLM Authorization Proxy Server' http://sourceforge.net/projects/ntlmaps/
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# Copyright 2001 Dmitry A. Rozmanov <dima@xenon.spb.ru>
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#
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# This library is free software: you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation, either
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# version 3 of the License, or (at your option) any later version.
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library. If not, see <http://www.gnu.org/licenses/> or <http://www.gnu.org/licenses/lgpl.txt>.
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import six
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from ntlm_auth.U32 import U32
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from ntlm_auth.des_data import des_SPtrans, des_skb
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def c2l(c):
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"char[4] to unsigned long"
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l = U32(c[0])
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l = l | (U32(c[1]) << 8)
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l = l | (U32(c[2]) << 16)
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l = l | (U32(c[3]) << 24)
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return l
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def l2c(l):
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"unsigned long to char[4]"
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c = []
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c.append(int(l & U32(0xFF)))
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c.append(int((l >> 8) & U32(0xFF)))
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c.append(int((l >> 16) & U32(0xFF)))
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c.append(int((l >> 24) & U32(0xFF)))
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return c
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def D_ENCRYPT(tup, u, t, s):
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L, R, S = tup
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# print 'LRS1', L, R, S, u, t, '-->',
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u = (R ^ s[S])
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t = R ^ s[S + 1]
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t = ((t >> 4) + (t << 28))
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L = L ^ (des_SPtrans[1][int((t) & U32(0x3f))] |
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des_SPtrans[3][int((t >> 8) & U32(0x3f))] |
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des_SPtrans[5][int((t >> 16) & U32(0x3f))] |
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des_SPtrans[7][int((t >> 24) & U32(0x3f))] |
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des_SPtrans[0][int((u) & U32(0x3f))] |
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des_SPtrans[2][int((u >> 8) & U32(0x3f))] |
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des_SPtrans[4][int((u >> 16) & U32(0x3f))] |
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des_SPtrans[6][int((u >> 24) & U32(0x3f))])
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# print 'LRS:', L, R, S, u, t
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return (L, R, S), u, t, s
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def PERM_OP(tup, n, m):
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"tup - (a, b, t)"
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a, b, t = tup
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t = ((a >> n) ^ b) & m
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b = b ^ t
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a = a ^ (t << n)
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return (a, b, t)
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def HPERM_OP(tup, n, m):
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"tup - (a, t)"
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a, t = tup
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t = ((a << (16 - n)) ^ a) & m
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a = a ^ t ^ (t >> (16 - n))
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return a, t
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shifts2 = [0, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0]
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class DES:
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KeySched = None # des_key_schedule
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def __init__(self, key_str):
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self.KeySched = des_set_key(key_str)
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def decrypt(self, str):
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# block - UChar[]
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block = []
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for i in six.iterbytes(str):
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block.append(i)
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# print block
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block = des_ecb_encrypt(block, self.KeySched, 0)
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res = b''
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for i in block:
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res = res + six.int2byte(i)
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return res
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def encrypt(self, plaintext):
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# block - UChar[]
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block = []
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for i in plaintext:
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block.append(i)
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block = des_ecb_encrypt(block, self.KeySched, 1)
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res = b''
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for i in block:
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res += six.int2byte(i)
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return res
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def des_encript(input, ks, encrypt):
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# input - U32[]
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# output - U32[]
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# ks - des_key_shedule - U32[2][16]
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# encrypt - int
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# l, r, t, u - U32
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# i - int
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# s - U32[]
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l = input[0]
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r = input[1]
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t = U32(0)
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u = U32(0)
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r, l, t = PERM_OP((r, l, t), 4, U32(0x0f0f0f0f))
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l, r, t = PERM_OP((l, r, t), 16, U32(0x0000ffff))
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r, l, t = PERM_OP((r, l, t), 2, U32(0x33333333))
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l, r, t = PERM_OP((l, r, t), 8, U32(0x00ff00ff))
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r, l, t = PERM_OP((r, l, t), 1, U32(0x55555555))
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t = (r << 1) | (r >> 31)
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r = (l << 1) | (l >> 31)
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l = t
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s = ks # ???????????????
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# print l, r
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if encrypt:
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for i in range(0, 32, 4):
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rtup, u, t, s = D_ENCRYPT((l, r, i + 0), u, t, s)
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l = rtup[0]
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r = rtup[1]
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rtup, u, t, s = D_ENCRYPT((r, l, i + 2), u, t, s)
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r = rtup[0]
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l = rtup[1]
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else:
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for i in range(30, 0, -4):
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rtup, u, t, s = D_ENCRYPT((l, r, i - 0), u, t, s)
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l = rtup[0]
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r = rtup[1]
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rtup, u, t, s = D_ENCRYPT((r, l, i - 2), u, t, s)
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r = rtup[0]
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l = rtup[1]
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# print l, r
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l = (l >> 1) | (l << 31)
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r = (r >> 1) | (r << 31)
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r, l, t = PERM_OP((r, l, t), 1, U32(0x55555555))
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l, r, t = PERM_OP((l, r, t), 8, U32(0x00ff00ff))
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r, l, t = PERM_OP((r, l, t), 2, U32(0x33333333))
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l, r, t = PERM_OP((l, r, t), 16, U32(0x0000ffff))
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r, l, t = PERM_OP((r, l, t), 4, U32(0x0f0f0f0f))
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output = [l]
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output.append(r)
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l, r, t, u = U32(0), U32(0), U32(0), U32(0)
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return output
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def des_ecb_encrypt(input, ks, encrypt):
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# input - des_cblock - UChar[8]
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# output - des_cblock - UChar[8]
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# ks - des_key_shedule - U32[2][16]
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# encrypt - int
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# print input
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l0 = c2l(input[0:4])
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l1 = c2l(input[4:8])
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ll = [l0]
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ll.append(l1)
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# print ll
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ll = des_encript(ll, ks, encrypt)
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# print ll
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l0 = ll[0]
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l1 = ll[1]
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output = l2c(l0)
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output = output + l2c(l1)
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# print output
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l0, l1, ll[0], ll[1] = U32(0), U32(0), U32(0), U32(0)
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return output
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def des_set_key(key):
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# key - des_cblock - UChar[8]
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# schedule - des_key_schedule
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# register unsigned long c,d,t,s;
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# register unsigned char *in;
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# register unsigned long *k;
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# register int i;
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# k = schedule
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# in = key
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k = []
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c = c2l(key[0:4])
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d = c2l(key[4:8])
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t = U32(0)
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d, c, t = PERM_OP((d, c, t), 4, U32(0x0f0f0f0f))
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c, t = HPERM_OP((c, t), -2, U32(0xcccc0000))
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d, t = HPERM_OP((d, t), -2, U32(0xcccc0000))
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d, c, t = PERM_OP((d, c, t), 1, U32(0x55555555))
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c, d, t = PERM_OP((c, d, t), 8, U32(0x00ff00ff))
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d, c, t = PERM_OP((d, c, t), 1, U32(0x55555555))
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d = (((d & U32(0x000000ff)) << 16) | (d & U32(0x0000ff00)) | ((d & U32(0x00ff0000)) >> 16) | (
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(c & U32(0xf0000000)) >> 4))
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c = c & U32(0x0fffffff)
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for i in range(16):
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if (shifts2[i]):
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c = ((c >> 2) | (c << 26))
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d = ((d >> 2) | (d << 26))
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else:
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c = ((c >> 1) | (c << 27))
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d = ((d >> 1) | (d << 27))
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c = c & U32(0x0fffffff)
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d = d & U32(0x0fffffff)
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s = des_skb[0][int((c) & U32(0x3f))] | \
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des_skb[1][int(((c >> 6) & U32(0x03)) | ((c >> 7) & U32(0x3c)))] | \
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des_skb[2][int(((c >> 13) & U32(0x0f)) | ((c >> 14) & U32(0x30)))] | \
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des_skb[3][int(((c >> 20) & U32(0x01)) | ((c >> 21) & U32(0x06)) | ((c >> 22) & U32(0x38)))]
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t = des_skb[4][int((d) & U32(0x3f))] | \
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des_skb[5][int(((d >> 7) & U32(0x03)) | ((d >> 8) & U32(0x3c)))] | \
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des_skb[6][int((d >> 15) & U32(0x3f))] | \
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des_skb[7][int(((d >> 21) & U32(0x0f)) | ((d >> 22) & U32(0x30)))]
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# print s, t
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k.append(((t << 16) | (s & U32(0x0000ffff))) & U32(0xffffffff))
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s = ((s >> 16) | (t & U32(0xffff0000)))
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s = (s << 4) | (s >> 28)
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k.append(s & U32(0xffffffff))
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schedule = k
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return schedule
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