107 lines
2.8 KiB
JavaScript
107 lines
2.8 KiB
JavaScript
/*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Copyright (C) 2011 Joshua M. Clulow <josh@sysmgr.org>
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*/
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var crypto = require('crypto');
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var BigInteger = require('bigdecimal').BigInteger;
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function zeroExtend(str, len)
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{
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while (str.length < len)
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str = '0' + str;
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return (str);
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}
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/* number -> 8bit binary string */
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function bbs(num)
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{
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var s = BigInteger.valueOf(num).toString(2);
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return (zeroExtend(s, 8));
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}
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/* 7bit bit string -> 8bit odd parity bit string */
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function oddpar(bitstr)
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{
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var par = 1;
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for (var i = 0; i < bitstr.length; i++) {
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if (bitstr[i] === '1')
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par = (par + 1) % 2;
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}
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return (bitstr + String(par));
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}
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/* 64bit bit string -> 8byte binary string */
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function binkey(bitstr)
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{
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var out = new Buffer(8);
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var bi = new BigInteger(bitstr, 2);
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for (var i = 0; i < 8; i++) {
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var bi = new BigInteger(bitstr.substr(8 * i, 8), 2);
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out[i] = bi.intValue();
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}
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return out.toString('binary');
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}
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/*
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* Generate the LM Hash
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*/
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module.exports.lmhash = function lmhash(inputstr)
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{
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/* ASCII --> uppercase */
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var x = inputstr.toUpperCase();
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/* null pad to 14 bytes */
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var y = "";
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for (var i = 0; i < 14; i++) {
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if (i < x.length)
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y += bbs(x.charCodeAt(i));
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else
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y += '00000000';
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}
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/* insert odd parity bits in key */
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var os = "";
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for (var i = 0; i < y.length / 7; i++) {
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os += oddpar(y.substr(i * 7, 7));
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}
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/* split into two 8-byte DES keys */
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var halves = [os.substr(0, 64), os.substr(64, 64)];
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/* DES encrypt magic number "KGS!@#$%" to two
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* 8-byte ciphertexts, (ECB, no padding)
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*/
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var cts = [];
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for (var i = 0; i < halves.length; i++) {
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var des = crypto.createCipheriv('DES-ECB',
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binkey(halves[i]), '');
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cts[i] = des.update('KGS!@#$%', 'binary', 'hex');
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}
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/* concat the two ciphertexts to form 16byte value,
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* the LM hash */
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var out = zeroExtend(cts[0], 16) + zeroExtend(cts[1], 16);
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return (out.toUpperCase());
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}
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module.exports.nthash = function nthash(str)
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{
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/* take MD4 hash of UCS-2 encoded password */
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var ucs2 = new Buffer(str, 'ucs2');
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var md4 = crypto.createHash('md4');
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md4.update(ucs2);
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return (zeroExtend(md4.digest('hex'), 32).toUpperCase());
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}
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