121 lines
3.7 KiB
JavaScript
121 lines
3.7 KiB
JavaScript
var winston = require('winston');
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var log = winston.loggers.get('main');
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var delta = 0x9E3779B9;
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var XXTEA_NUM_ROUNDS = 32;
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//var xxxteaEncrypt = function(unsigned long v[2]) {
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// unsigned int i;
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// unsigned long v0=v[0], v1=v[1], sum=0, delta=0x9E3779B9;
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// for (i=0; i < XXTEA_NUM_ROUNDS; i++) {
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// v0 += (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + XBHardware.config.net_key.u32[sum & 3]);
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// sum += delta;
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// v1 += (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + XBHardware.config.net_key.u32[(sum>>11) & 3]);
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// }
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// v[0]=v0; v[1]=v1;
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//}
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var xxxteaDecrypt = function(vArray,keyBuff) {
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log.debug('XDeviceEncryption.xxxteaDecrypt vArray='+JSON.stringify(vArray)+' keyBuff='+JSON.stringify(keyBuff));
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var v0=vArray.v0;
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var v1=vArray.v1;
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log.debug('XDeviceEncryption.xxxteaDecrypt start v0='+v0.toString(16)+' v1='+v1.toString(16));
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var delta=0x9E3779B9
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var sum=delta*XXTEA_NUM_ROUNDS;
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for (var i=0; i < XXTEA_NUM_ROUNDS; i++) {
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v1 -= (((v0 << 4) ^ (v0 >>> 5)) + v0) ^ (sum + keyBuff.readUInt32BE((sum>>>11) & 3));
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var v1Org = v1;
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sum -= delta;
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v0 -= (((v1 << 4) ^ (v1 >>> 5)) + v1) ^ (sum + keyBuff.readUInt32BE(sum & 3));
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//log.debug('XDeviceEncryption.xxxteaDecrypt v0='+v0.toString(16)+' v1='+v1.toString(16));
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if (v0 < 0) { v0 = Math.pow(2,32) + v0; }
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if (v0 > Math.pow(2,32)) { v0 = v0 - Math.pow(2,32); }
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if (v1 < 0) { v1 = Math.pow(2,32) + v1; }
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if (v1 > Math.pow(2,32)) { v1 = v1 - Math.pow(2,32); }
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}
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//v0 = v0 & 0xFFFFFFFF;
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//v1 = v1 & 0xFFFFFFFF;
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var result = {v0: v0,v1: v1};
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log.debug('XDeviceEncryption.xxxteaDecrypt result='+JSON.stringify(result));
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return result;
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}
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// public static method encrypt
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exports.xxteaEncrypt = function(string, key) {
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log.debug('XDeviceEncryption.xxteaEncrypt key='+key+' data='+string);
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if (string.length == 0) {
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return('');
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}
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//var v = strToLongs(Utf8.encode(string));
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//var k = strToLongs(Utf8.encode(key).slice(0,16));
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var v = buffToLongs(new Buffer(string, 'hex'));
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var k = buffToLongs(new Buffer(key, 'hex'));
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//if (v.length <= 1) v[1] = 0; // algorithm doesn't work for n<2 so fudge by adding a null
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var n = v.length;
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// ---- <TEA coding> ----
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var z = v[n-1], y = v[0], delta = 0x9E3779B9;
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var mx, e, q = Math.floor(6 + 52/n), sum = 0;
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while (q-- > 0) { // 6 + 52/n operations gives between 6 & 32 mixes on each word
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sum += delta;
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e = sum>>>2 & 3;
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for (var p = 0; p < n; p++) {
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y = v[(p+1)%n];
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mx = (z>>>5 ^ y<<2) + (y>>>3 ^ z<<4) ^ (sum^y) + (k[p&3 ^ e] ^ z);
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z = v[p] += mx;
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}
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}
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// ---- </TEA> ----
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var buff = longsToBuff(v);
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return buff.toString('ascii');
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}
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exports.xxteaDecrypt = function(data, key) {
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log.debug('XDeviceEncryption.xxteaDecrypt key='+key+' data='+data);
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if (data.length == 0) {
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return('');
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}
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var d = new Buffer(data, 'hex');
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var k = new Buffer(key, 'hex');
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var n = d.length;
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var r = new Buffer(n);
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log.debug('XDeviceEncryption.xxteaDecrypt dataBuffer='+d.toString('hex'));
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// ---- <TEA decoding> ----
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for (var i=0;i<n/4-1;i=i+2) {
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//log.debug('XDeviceEncryption.xxteaDecrypt n='+n+' i='+i+' c='+(i*4)+' cc='+(i*4+1)+' r='+d.readUInt32LE(i*4).toString(16)+' r1='+d.readUInt32BE(i*4).toString(16));
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var ed = {v0: d.readUInt32BE(i*4),v1: d.readUInt32BE((i+1)*4)};
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var dd = xxxteaDecrypt(ed,k);
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r.writeUInt32BE(dd.v0,i*4);
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r.writeUInt32BE(dd.v1,(i+1)*4);
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}
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return r.toString('ascii');
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//var plaintext = longsToStr(v);
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//plaintext = plaintext.replace(/\0+$/,'');
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//return plaintext;
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//return new Buffer(plaintext,'utf8').toString('ascii');
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//var plaintext = longsToStr(v);
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//plaintext = plaintext.replace(/\0+$/,'');// strip trailing null chars resulting from filling 4-char blocks:
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//return Utf8.decode(plaintext);
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}
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