78 lines
2.2 KiB
JavaScript
78 lines
2.2 KiB
JavaScript
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/*
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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) 2012 Joshua M. Clulow <josh@sysmgr.org>
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*/
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var crypto = require('crypto');
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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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/*
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* Fix (odd) parity bits in a 64-bit DES key.
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*/
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function oddpar(buf)
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{
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for (var j = 0; j < buf.length; j++) {
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var par = 1;
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for (var i = 1; i < 8; i++) {
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par = (par + ((buf[j] >> i) & 1)) % 2;
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}
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buf[j] |= par & 1;
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}
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return buf;
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}
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/*
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* Expand a 56-bit key buffer to the full 64-bits for DES.
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*
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* Based on code sample in:
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* http://www.innovation.ch/personal/ronald/ntlm.html
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*/
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function expandkey(key56)
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{
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var key64 = new Buffer(8);
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key64[0] = key56[0] & 0xFE;
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key64[1] = ((key56[0] << 7) & 0xFF) | (key56[1] >> 1);
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key64[2] = ((key56[1] << 6) & 0xFF) | (key56[2] >> 2);
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key64[3] = ((key56[2] << 5) & 0xFF) | (key56[3] >> 3);
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key64[4] = ((key56[3] << 4) & 0xFF) | (key56[4] >> 4);
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key64[5] = ((key56[4] << 3) & 0xFF) | (key56[5] >> 5);
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key64[6] = ((key56[5] << 2) & 0xFF) | (key56[6] >> 6);
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key64[7] = (key56[6] << 1) & 0xFF;
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return key64;
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}
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/*
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* Convert a binary string to a hex string
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*/
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function bintohex(bin)
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{
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var buf = (Buffer.isBuffer(buf) ? buf : new Buffer(bin, 'binary'));
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var str = buf.toString('hex').toUpperCase();
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return zeroextend(str, 32);
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}
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module.exports.zeroextend = zeroextend;
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module.exports.oddpar = oddpar;
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module.exports.expandkey = expandkey;
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module.exports.bintohex = bintohex;
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