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