_crypto.js

这是一个ajax的例子大家好好的看看就是一个鱼眼的效果

if(!dojo._hasResource["dojox._sql._crypto"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
dojo._hasResource["dojox._sql._crypto"] = true;
// Taken from http://www.movable-type.co.uk/scripts/aes.html by
// Chris Veness (CLA signed); adapted for Dojo and Google Gears Worker Pool
// by Brad Neuberg, [e-mail]

dojo.provide("dojox._sql._crypto");

dojo.mixin(dojox._sql._crypto,{
	// _POOL_SIZE:
	//	Size of worker pool to create to help with crypto
	_POOL_SIZE: 100,
	
	encrypt: function(plaintext, password, callback){
		// summary:
		//	Use Corrected Block TEA to encrypt plaintext using password
		//	(note plaintext & password must be strings not string objects).
		//	Results will be returned to the 'callback' asychronously.	
		this._initWorkerPool();
	
		var msg ={plaintext: plaintext, password: password};
		msg = dojo.toJson(msg);
		msg = "encr:" + String(msg);
	
		this._assignWork(msg, callback);
	},

	decrypt: function(ciphertext, password, callback){
		// summary:
		//	Use Corrected Block TEA to decrypt ciphertext using password
		//	(note ciphertext & password must be strings not string objects).
		//	Results will be returned to the 'callback' asychronously.
		this._initWorkerPool();
	
		var msg ={ciphertext: ciphertext, password: password};
		msg = dojo.toJson(msg);
		msg = "decr:" + String(msg);
	
		this._assignWork(msg, callback);
	},
	
	_initWorkerPool: function(){
		// bugs in Google Gears prevents us from dynamically creating
		// and destroying workers as we need them -- the worker
		// pool functionality stops working after a number of crypto
		// cycles (probably related to a memory leak in Google Gears).
		// this is too bad, since it results in much simpler code.
	
		// instead, we have to create a pool of workers and reuse them. we
		// keep a stack of 'unemployed' Worker IDs that are currently not working.
		// if a work request comes in, we pop off the 'unemployed' stack
		// and put them to work, storing them in an 'employed' hashtable,
		// keyed by their Worker ID with the value being the callback function
		// that wants the result. when an employed worker is done, we get
		// a message in our 'manager' which adds this worker back to the 
		// unemployed stack and routes the result to the callback that
		// wanted it. if all the workers were employed in the past but
		// more work needed to be done (i.e. it's a tight labor pool ;) 
		// then the work messages are pushed onto
		// a 'handleMessage' queue as an object tuple{msg: msg, callback: callback}
	
		if(!this._manager){
			try{
				this._manager = google.gears.factory.create("beta.workerpool", "1.0");
				this._unemployed = [];
				this._employed ={};
				this._handleMessage = [];
			
				var self = this;
				this._manager.onmessage = function(msg, sender){
					// get the callback necessary to serve this result
					var callback = self._employed["_" + sender];
				
					// make this worker unemployed
					self._employed["_" + sender] = undefined;
					self._unemployed.push("_" + sender);
				
					// see if we need to assign new work
					// that was queued up needing to be done
					if(self._handleMessage.length){
						var handleMe = self._handleMessage.shift();
						self._assignWork(handleMe.msg, handleMe.callback);
					}
				
					// return results
					callback(msg);
				}
				
				var workerInit = "function _workerInit(){"
									+ "gearsWorkerPool.onmessage = "
										+ String(this._workerHandler)
									+ ";"
								+ "}";
			
				var code = workerInit + " _workerInit();";
	
				// create our worker pool
				for(var i = 0; i < this._POOL_SIZE; i++){
					this._unemployed.push("_" + this._manager.createWorker(code));
				}
			}catch(exp){
				throw exp.message||exp;
			}
		}
	},

	_assignWork: function(msg, callback){
		// can we immediately assign this work?
		if(!this._handleMessage.length && this._unemployed.length){
			// get an unemployed worker
			var workerID = this._unemployed.shift().substring(1); // remove _
		
			// list this worker as employed
			this._employed["_" + workerID] = callback;
		
			// do the worke
			this._manager.sendMessage(msg, workerID);
		}else{
			// we have to queue it up
			this._handleMessage ={msg: msg, callback: callback};
		}
	},

	_workerHandler: function(msg, sender){
		
		/* Begin AES Implementation */
		
		/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  */
		
		// Sbox is pre-computed multiplicative inverse in GF(2^8) used in SubBytes and KeyExpansion [§5.1.1]
		var Sbox =	[0x63,0x7c,0x77,0x7b,0xf2,0x6b,0x6f,0xc5,0x30,0x01,0x67,0x2b,0xfe,0xd7,0xab,0x76,
					 0xca,0x82,0xc9,0x7d,0xfa,0x59,0x47,0xf0,0xad,0xd4,0xa2,0xaf,0x9c,0xa4,0x72,0xc0,
					 0xb7,0xfd,0x93,0x26,0x36,0x3f,0xf7,0xcc,0x34,0xa5,0xe5,0xf1,0x71,0xd8,0x31,0x15,
					 0x04,0xc7,0x23,0xc3,0x18,0x96,0x05,0x9a,0x07,0x12,0x80,0xe2,0xeb,0x27,0xb2,0x75,
					 0x09,0x83,0x2c,0x1a,0x1b,0x6e,0x5a,0xa0,0x52,0x3b,0xd6,0xb3,0x29,0xe3,0x2f,0x84,
					 0x53,0xd1,0x00,0xed,0x20,0xfc,0xb1,0x5b,0x6a,0xcb,0xbe,0x39,0x4a,0x4c,0x58,0xcf,
					 0xd0,0xef,0xaa,0xfb,0x43,0x4d,0x33,0x85,0x45,0xf9,0x02,0x7f,0x50,0x3c,0x9f,0xa8,
					 0x51,0xa3,0x40,0x8f,0x92,0x9d,0x38,0xf5,0xbc,0xb6,0xda,0x21,0x10,0xff,0xf3,0xd2,
					 0xcd,0x0c,0x13,0xec,0x5f,0x97,0x44,0x17,0xc4,0xa7,0x7e,0x3d,0x64,0x5d,0x19,0x73,
					 0x60,0x81,0x4f,0xdc,0x22,0x2a,0x90,0x88,0x46,0xee,0xb8,0x14,0xde,0x5e,0x0b,0xdb,
					 0xe0,0x32,0x3a,0x0a,0x49,0x06,0x24,0x5c,0xc2,0xd3,0xac,0x62,0x91,0x95,0xe4,0x79,
					 0xe7,0xc8,0x37,0x6d,0x8d,0xd5,0x4e,0xa9,0x6c,0x56,0xf4,0xea,0x65,0x7a,0xae,0x08,
					 0xba,0x78,0x25,0x2e,0x1c,0xa6,0xb4,0xc6,0xe8,0xdd,0x74,0x1f,0x4b,0xbd,0x8b,0x8a,
					 0x70,0x3e,0xb5,0x66,0x48,0x03,0xf6,0x0e,0x61,0x35,0x57,0xb9,0x86,0xc1,0x1d,0x9e,
					 0xe1,0xf8,0x98,0x11,0x69,0xd9,0x8e,0x94,0x9b,0x1e,0x87,0xe9,0xce,0x55,0x28,0xdf,
					 0x8c,0xa1,0x89,0x0d,0xbf,0xe6,0x42,0x68,0x41,0x99,0x2d,0x0f,0xb0,0x54,0xbb,0x16];

		// Rcon is Round Constant used for the Key Expansion [1st col is 2^(r-1) in GF(2^8)] [§5.2]
		var Rcon = [ [0x00, 0x00, 0x00, 0x00],
					 [0x01, 0x00, 0x00, 0x00],
					 [0x02, 0x00, 0x00, 0x00],
					 [0x04, 0x00, 0x00, 0x00],
					 [0x08, 0x00, 0x00, 0x00],
					 [0x10, 0x00, 0x00, 0x00],
					 [0x20, 0x00, 0x00, 0x00],
					 [0x40, 0x00, 0x00, 0x00],
					 [0x80, 0x00, 0x00, 0x00],
					 [0x1b, 0x00, 0x00, 0x00],
					 [0x36, 0x00, 0x00, 0x00] ]; 

		/*
		 * AES Cipher function: encrypt 'input' with Rijndael algorithm
		 *
		 *	 takes	 byte-array 'input' (16 bytes)
		 *			 2D byte-array key schedule 'w' (Nr+1 x Nb bytes)
		 *
		 *	 applies Nr rounds (10/12/14) using key schedule w for 'add round key' stage
		 *
		 *	 returns byte-array encrypted value (16 bytes)
		 */
		function Cipher(input, w) {	   // main Cipher function [§5.1]
		  var Nb = 4;				// block size (in words): no of columns in state (fixed at 4 for AES)
		  var Nr = w.length/Nb - 1; // no of rounds: 10/12/14 for 128/192/256-bit keys

		  var state = [[],[],[],[]];  // initialise 4xNb byte-array 'state' with input [§3.4]
		  for (var i=0; i<4*Nb; i++) state[i%4][Math.floor(i/4)] = input[i];

		  state = AddRoundKey(state, w, 0, Nb);

		  for (var round=1; round<Nr; round++) {
			state = SubBytes(state, Nb);
			state = ShiftRows(state, Nb);
			state = MixColumns(state, Nb);
			state = AddRoundKey(state, w, round, Nb);
		  }

		  state = SubBytes(state, Nb);
		  state = ShiftRows(state, Nb);
		  state = AddRoundKey(state, w, Nr, Nb);

		  var output = new Array(4*Nb);	 // convert state to 1-d array before returning [§3.4]
		  for (var i=0; i<4*Nb; i++) output[i] = state[i%4][Math.floor(i/4)];
		  return output;
		}


		function SubBytes(s, Nb) {	  // apply SBox to state S [§5.1.1]
		  for (var r=0; r<4; r++) {
			for (var c=0; c<Nb; c++) s[r][c] = Sbox[s[r][c]];
		  }
		  return s;
		}


		function ShiftRows(s, Nb) {	   // shift row r of state S left by r bytes [§5.1.2]
		  var t = new Array(4);
		  for (var r=1; r<4; r++) {
			for (var c=0; c<4; c++) t[c] = s[r][(c+r)%Nb];	// shift into temp copy
			for (var c=0; c<4; c++) s[r][c] = t[c];			// and copy back
		  }			 // note that this will work for Nb=4,5,6, but not 7,8 (always 4 for AES):
		  return s;	 // see fp.gladman.plus.com/cryptography_technology/rijndael/aes.spec.311.pdf 
		}


		function MixColumns(s, Nb) {   // combine bytes of each col of state S [§5.1.3]
		  for (var c=0; c<4; c++) {
			var a = new Array(4);  // 'a' is a copy of the current column from 's'
			var b = new Array(4);  // 'b' is a•{02} in GF(2^8)
			for (var i=0; i<4; i++) {
			  a[i] = s[i][c];
			  b[i] = s[i][c]&0x80 ? s[i][c]<<1 ^ 0x011b : s[i][c]<<1;
			}