78 lines
2.7 KiB
JavaScript
78 lines
2.7 KiB
JavaScript
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define([
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'/bower_components/tweetnacl/nacl-fast.min.js',
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], function () {
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var Nacl = window.nacl;
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var module = { exports: {} };
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var encryptStr = function (str, key) {
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var array = Nacl.util.decodeUTF8(str);
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var nonce = Nacl.randomBytes(24);
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var packed = Nacl.secretbox(array, nonce, key);
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if (!packed) { throw new Error(); }
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return Nacl.util.encodeBase64(nonce) + "|" + Nacl.util.encodeBase64(packed);
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};
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var decryptStr = function (str, key) {
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var arr = str.split('|');
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if (arr.length !== 2) { throw new Error(); }
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var nonce = Nacl.util.decodeBase64(arr[0]);
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var packed = Nacl.util.decodeBase64(arr[1]);
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var unpacked = Nacl.secretbox.open(packed, nonce, key);
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if (!unpacked) { throw new Error(); }
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return Nacl.util.encodeUTF8(unpacked);
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};
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// this is crap because of bencoding messages... it should go away....
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var splitMessage = function (msg, sending) {
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var idx = 0;
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var nl;
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for (var i = ((sending) ? 0 : 1); i < 3; i++) {
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nl = msg.indexOf(':',idx);
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idx = nl + Number(msg.substring(idx,nl)) + 1;
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}
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return [ msg.substring(0,idx), msg.substring(msg.indexOf(':',idx) + 1) ];
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};
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var encrypt = module.exports.encrypt = function (msg, key) {
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var spl = splitMessage(msg, true);
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var json = JSON.parse(spl[1]);
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// non-patches are not encrypted.
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if (json[0] !== 2) { return msg; }
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json[1] = encryptStr(JSON.stringify(json[1]), key);
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var res = JSON.stringify(json);
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return spl[0] + res.length + ':' + res;
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};
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var decrypt = module.exports.decrypt = function (msg, key) {
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var spl = splitMessage(msg, false);
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var json = JSON.parse(spl[1]);
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// non-patches are not encrypted.
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if (json[0] !== 2) { return msg; }
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if (typeof(json[1]) !== 'string') { throw new Error(); }
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json[1] = JSON.parse(decryptStr(json[1], key));
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var res = JSON.stringify(json);
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return spl[0] + res.length + ':' + res;
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};
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var parseKey = module.exports.parseKey = function (str) {
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var array = Nacl.util.decodeBase64(str);
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var hash = Nacl.hash(array);
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var lk = hash.subarray(32);
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return {
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lookupKey: lk,
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cryptKey: hash.subarray(0,32),
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channel: Nacl.util.encodeBase64(lk).substring(0,10)
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};
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};
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var rand64 = module.exports.rand64 = function (bytes) {
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return Nacl.util.encodeBase64(Nacl.randomBytes(bytes));
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};
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var genKey = module.exports.genKey = function () {
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return rand64(18);
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};
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return module.exports;
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});
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