Replace crypto.pseudoRandomBytes with something faster

(and probably of lower quality, not that it really matters)

lib/article.js

@@ -141,15 +141,44 @@ MultiEncoder.maxSize = function(size, line_size) {
 	*/
 };
 
+// something that isn't as slow as crypto.pseudoRandomBytes
+var randString = function() {
+	return String.fromCharCode(
+		65 + Math.random()*26,
+		97 + Math.random()*26,
+		65 + Math.random()*26,
+		97 + Math.random()*26,
+		65 + Math.random()*26,
+		97 + Math.random()*26,
+		65 + Math.random()*26,
+		97 + Math.random()*26,
+		65 + Math.random()*26,
+		97 + Math.random()*26,
+		65 + Math.random()*26,
+		97 + Math.random()*26,
+		65 + Math.random()*26,
+		97 + Math.random()*26,
+		65 + Math.random()*26,
+		97 + Math.random()*26,
+		65 + Math.random()*26,
+		97 + Math.random()*26,
+		65 + Math.random()*26,
+		97 + Math.random()*26,
+		65 + Math.random()*26,
+		97 + Math.random()*26,
+		65 + Math.random()*26,
+		97 + Math.random()*26
+	);
+};
 
-var crypto = require('crypto');
 function Post(headers, pool, date) {
 	this.headers = {};
 	this.postPos = 0;
 	this.pool = pool;
 	this.genTime = date ? date.getTime() : Date.now();
 
-	this.messageId = crypto.pseudoRandomBytes(16).toString('hex') + '-' + this.genTime + '@nyuu';
+	// TODO: consider writing Message-ID as the first header - this simplifies some logic
+	this.messageId = randString() + '-' + this.genTime + '@nyuu';
 	if(pool) {
 		this.buf = pool.get();
 		while(1) {
@@ -204,9 +233,9 @@ Post.prototype = {
 	bufs: null,
 
 	randomizeMessageID: function() {
-		var rnd = crypto.pseudoRandomBytes(16).toString('hex');
+		var rnd = randString();
 		this.data.write(rnd, this.mIdPos, ENCODING);
-		return this.messageId = rnd + this.messageId.substr(32);
+		return this.messageId = rnd + this.messageId.substr(24);
 	},
 
 	release: function() {