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/**
* <b>this java class consists the server side for the wondeful javascript library ´sha1.js´. i wrote it because i basically needed 【程序编程相关:极限编程中的简单设计原则】 【推荐阅读:开放源码-SMTP发信客户端 for J】 * some cheap client/server login authentication by the usual key/data system. besides, i got the creeps watching the password 【扩展信息:前进中的Web3D】 * posted unencrypted via http requests. this class makes sure that if your client is using the ´sha1.js´ to encrypt the password * with a key sent by the server, you can always repeat the encrypting on the server side (using the same key) and compare the * encrypted strings. since anyone who is trapping the http requests can actually send you the same encrypted string, i suggest * you use the client´s ip address as the base for the key generation. since ip address spoofing is not a problem, this authentication * method is not a very secured solution. if you need a full proof solution use ssl. however, this one, sure beats nothing. * feel free to do with it whatever you want</b> * <p><b>this class is an abstract class, to make sure you do not create any new instances of it. it does not throw any exceptions and * the code is much more ´c´ like than pure object oriented. there are no implemented interfaces and no inheritance in use. in fact, it * is written as close as possible to the original javascript code. i did not test tweaking the instance variables but if you do change * them, make sure to apply the same change in the ´sha1.js´ library or you won´t get the same encrypted strings. * you can call each one of the 6 work methods by using something like: sha1.hex_hmac_sha1("key", "data"); * they are the only public methods. all are public and static. you have no reason to call the private ones anyway.</p></b> * <p>the ´sha1.js´ is a javascript implementation of the secure hash algorithm, sha-1, as defined in fips pub 180-1. * javascript version 2.1 copyright paul johnston 2000 - 2002. other contributors to javascript version: greg holt, * andrew kepert, ydnar, lostinet distributed under the bsd license</p> * <p>see <a href="http://pajhome.org.uk/crypt/md5http://pajhome.org.uk/crypt/md5">http://pajhome.org.uk/crypt/md5</a> for details.</p> * <p><b>author: </b>t.n.silverman (c.t.xm - sia riga, lv) <a href="mailto:tnsilver@ctxm.commailto:tnsilver@ctcm.com">mailto:tnsilver@ctxm.com</a> * <br>creation date: (3/27/2004 5:57:00 pm)</p> ... 下一页