密码明文保存

https://github.com/leanote/desktop-app/issues/63

node_modules/common.js

@@ -1,4 +1,5 @@
 var fs = require('fs');
+var crypto = require('crypto');
 // var User = require('user');
 // var Evt = require('evt');
 var ObjectId = require('objectid');
@@ -207,6 +208,17 @@ var Common = {
 			last = exec(cmd); 
 			last.on('exit', exitFunc);
 		}
+	},
+
+	md5: function(str, salt) {
+		var md5sum = crypto.createHash('md5');
+		var key = str;
+		if (salt) {
+			key += salt;
+		}
+		md5sum.update(key);
+		str = md5sum.digest('hex');
+		return str;
 	}
 };
 module.exports = Common;