// //========================== MD5报文摘要函数 ================================================================

function MD5(sMessage) {

		function strtoArray(str)
		{
		 var chystr =str;
		 //原字符长度
		 var chyLength = chystr.length;
		  //填充,加长度值后,按512b=64字节分组后,的组数
			var L512bNum=Math.ceil((chyLength + 8)/64);
		  //按32b=4字节分组后,的数组组数
			var Array32bNum=L512bNum*16;
			//创建长度32b=4字节的字组
			var strArray=Array(Array32bNum-1);
			//将原字符串的二进制码分配到数组中
			//在这里int型数据占4字节32bit
			//数组的下标值,一个数组有4个字符
			var Arrayi = 0;
			//原字符串的二进制码左移数量
			var charleftmove = 0;
			var i=0;
			while(i<chyLength) 
			{
				Arrayi = Math.floor(i/4);
				charleftmove = (i % 4)*8;
				strArray[Arrayi] = (strArray[Arrayi] | (chystr.charCodeAt(i)<<charleftmove));
				i++ ;
			}
			//字符填充完成后，填充填充位,只需将一个1000，0000放在字符后即可
				Arrayi = Math.floor(i/4);
				charleftmove = (i % 4)*8;
				strArray[Arrayi] = strArray[Arrayi] | (0x80<<charleftmove);
			//加字符串长度值
			strArray[Array32bNum-2] = chyLength<<3;
			strArray[Array32bNum-1] = chyLength>>>29;
		return strArray;
		
		}

		function AddUnsigned(lX,lY) {
			var lX4,lY4,lX8,lY8,lResult;
			lX8 = (lX & 0x80000000);
			lY8 = (lY & 0x80000000);
			lX4 = (lX & 0x40000000);
			lY4 = (lY & 0x40000000);
			lResult = (lX & 0x3FFFFFFF)+(lY & 0x3FFFFFFF);
			if (lX4 & lY4) return (lResult ^ 0x80000000 ^ lX8 ^ lY8);
			if (lX4 | lY4) {
				if (lResult & 0x40000000) return (lResult ^ 0xC0000000 ^ lX8 ^ lY8);
				else return (lResult ^ 0x40000000 ^ lX8 ^ lY8);
						   } 
			else return (lResult ^ lX8 ^ lY8);
		}
		function RotateLeft(lValue, iShiftBits) 
		{ return (lValue<<iShiftBits) | (lValue>>>(32-iShiftBits)); }

			//算法基础链接变量
			 var a = 0x67452301;
			 var b = 0xEFCDAB89;
			 var c = 0x98BADCFE; 
			 var d = 0x10325476;
			//算法基础16步操作常量
				var S11=7, S12=12, S13=17, S14=22;
				var S21=5, S22=9 , S23=14, S24=20;
				var S31=4, S32=11, S33=16, S34=23;
				var S41=6, S42=10, S43=15, S44=21;
			//算法基础非线性函数
			function F(x,y,z) { return (x & y) | ((~x) & z); }
			function G(x,y,z) { return (x & z) | (y & (~z)); }
			function H(x,y,z) { return (x ^ y ^ z); }
			function I(x,y,z) { return (y ^ (x | (~z))); }
			
			function FF(a,b,c,d,x,s,ac) 
			{
				a = AddUnsigned(a, AddUnsigned(AddUnsigned(F(b, c, d), x), ac));
				return AddUnsigned(RotateLeft(a, s), b);
			}
			function GG(a,b,c,d,x,s,ac) 
			{
				a = AddUnsigned(a, AddUnsigned(AddUnsigned(G(b, c, d), x), ac));
				return AddUnsigned(RotateLeft(a, s), b);
			}
			function HH(a,b,c,d,x,s,ac) 
			{
				a = AddUnsigned(a, AddUnsigned(AddUnsigned(H(b, c, d), x), ac));
				return AddUnsigned(RotateLeft(a, s), b);
			}
			function II(a,b,c,d,x,s,ac) 
			{
				a = AddUnsigned(a, AddUnsigned(AddUnsigned(I(b, c, d), x), ac));
				return AddUnsigned(RotateLeft(a, s), b);
			}

			function WordToHex(lValue) {
				var WordToHexValue="",WordToHexValue_temp="",lByte,lCount;
				for (lCount = 0;lCount<=3;lCount++) {
					lByte = (lValue>>>(lCount*8)) & 255;
					WordToHexValue_temp = "0" + lByte.toString(16);
					WordToHexValue = WordToHexValue + WordToHexValue_temp.substr(WordToHexValue_temp.length-2,2);
				}
				return WordToHexValue;
			}

			var x=Array();
			x = strtoArray(sMessage);
			var AA,BB,CC,DD
		
		 for (k=0;k<x.length;k+=16) {
				AA=a; BB=b; CC=c; DD=d;
		//第1轮
				a=FF(a,b,c,d,x[k+0], S11,0xD76AA478);
				d=FF(d,a,b,c,x[k+1], S12,0xE8C7B756);
				c=FF(c,d,a,b,x[k+2], S13,0x242070DB);
				b=FF(b,c,d,a,x[k+3], S14,0xC1BDCEEE);
				a=FF(a,b,c,d,x[k+4], S11,0xF57C0FAF);
				d=FF(d,a,b,c,x[k+5], S12,0x4787C62A);
				c=FF(c,d,a,b,x[k+6], S13,0xA8304613);
				b=FF(b,c,d,a,x[k+7], S14,0xFD469501);
				a=FF(a,b,c,d,x[k+8], S11,0x698098D8);
				d=FF(d,a,b,c,x[k+9], S12,0x8B44F7AF);
				c=FF(c,d,a,b,x[k+10],S13,0xFFFF5BB1);
				b=FF(b,c,d,a,x[k+11],S14,0x895CD7BE);
				a=FF(a,b,c,d,x[k+12],S11,0x6B901122);
				d=FF(d,a,b,c,x[k+13],S12,0xFD987193);
				c=FF(c,d,a,b,x[k+14],S13,0xA679438E);
				b=FF(b,c,d,a,x[k+15],S14,0x49B40821);
		//第2轮	
				a=GG(a,b,c,d,x[k+1], S21,0xF61E2562);
				d=GG(d,a,b,c,x[k+6], S22,0xC040B340);
				c=GG(c,d,a,b,x[k+11],S23,0x265E5A51);
				b=GG(b,c,d,a,x[k+0], S24,0xE9B6C7AA);
				a=GG(a,b,c,d,x[k+5], S21,0xD62F105D);
				d=GG(d,a,b,c,x[k+10],S22,0x2441453);
				c=GG(c,d,a,b,x[k+15],S23,0xD8A1E681);
				b=GG(b,c,d,a,x[k+4], S24,0xE7D3FBC8);
				a=GG(a,b,c,d,x[k+9], S21,0x21E1CDE6);
				d=GG(d,a,b,c,x[k+14],S22,0xC33707D6);
				c=GG(c,d,a,b,x[k+3], S23,0xF4D50D87);
				b=GG(b,c,d,a,x[k+8], S24,0x455A14ED);
				a=GG(a,b,c,d,x[k+13],S21,0xA9E3E905);
				d=GG(d,a,b,c,x[k+2], S22,0xFCEFA3F8);
				c=GG(c,d,a,b,x[k+7], S23,0x676F02D9);
				b=GG(b,c,d,a,x[k+12],S24,0x8D2A4C8A);
		//第3轮
				a=HH(a,b,c,d,x[k+5], S31,0xFFFA3942);
				d=HH(d,a,b,c,x[k+8], S32,0x8771F681);
				c=HH(c,d,a,b,x[k+11],S33,0x6D9D6122);
				b=HH(b,c,d,a,x[k+14],S34,0xFDE5380C);
				a=HH(a,b,c,d,x[k+1], S31,0xA4BEEA44);
				d=HH(d,a,b,c,x[k+4], S32,0x4BDECFA9);
				c=HH(c,d,a,b,x[k+7], S33,0xF6BB4B60);
				b=HH(b,c,d,a,x[k+10],S34,0xBEBFBC70);
				a=HH(a,b,c,d,x[k+13],S31,0x289B7EC6);
				d=HH(d,a,b,c,x[k+0], S32,0xEAA127FA);
				c=HH(c,d,a,b,x[k+3], S33,0xD4EF3085);
				b=HH(b,c,d,a,x[k+6], S34,0x4881D05);
				a=HH(a,b,c,d,x[k+9], S31,0xD9D4D039);
				d=HH(d,a,b,c,x[k+12],S32,0xE6DB99E5);
				c=HH(c,d,a,b,x[k+15],S33,0x1FA27CF8);
				b=HH(b,c,d,a,x[k+2], S34,0xC4AC5665);
		//第4轮
				a=II(a,b,c,d,x[k+0], S41,0xF4292244);
				d=II(d,a,b,c,x[k+7], S42,0x432AFF97);
				c=II(c,d,a,b,x[k+14],S43,0xAB9423A7);
				b=II(b,c,d,a,x[k+5], S44,0xFC93A039);
				a=II(a,b,c,d,x[k+12],S41,0x655B59C3);
				d=II(d,a,b,c,x[k+3], S42,0x8F0CCC92);
				c=II(c,d,a,b,x[k+10],S43,0xFFEFF47D);
				b=II(b,c,d,a,x[k+1], S44,0x85845DD1);
				a=II(a,b,c,d,x[k+8], S41,0x6FA87E4F);
				d=II(d,a,b,c,x[k+15],S42,0xFE2CE6E0);
				c=II(c,d,a,b,x[k+6], S43,0xA3014314);
				b=II(b,c,d,a,x[k+13],S44,0x4E0811A1);
				a=II(a,b,c,d,x[k+4], S41,0xF7537E82);
				d=II(d,a,b,c,x[k+11],S42,0xBD3AF235);
				c=II(c,d,a,b,x[k+2], S43,0x2AD7D2BB);
				b=II(b,c,d,a,x[k+9], S44,0xEB86D391);
				
				a=AddUnsigned(a,AA); b=AddUnsigned(b,BB); c=AddUnsigned(c,CC); d=AddUnsigned(d,DD);
			  }

    var temp= WordToHex(a)+WordToHex(b)+WordToHex(c)+WordToHex(d);
    return temp.toLowerCase();

}

// //========================== 检测登陆输入函数 ================================================================

function userlogin()
{ 
	if (document.formlogin.username.value =="")
	{
	alert("请输入用户名！");
	document.formlogin.username.focus();
	return false;
	}
	if (document.formlogin.username.value.length<4 || document.formlogin.username.value.length>16) { 
		alert("系统提示！\n\n用户名长度应在4到15位之间。"); 
		document.formlogin.username.focus();
		return false; 
	} 
	if (document.formlogin.password.value =="") 
	{
	alert("请输入密码！");
	document.formlogin.password.focus();
	return false; 
	}
	var password=document.formlogin.password.value;
	var MD5_pass=MD5(password);
	document.formlogin.password_MD5.value=MD5_pass;
	var filter=/^\s*[.A-Za-z0-9_-]{4,15}\s*$/;
	if (!filter.test(document.formlogin.password.value)) { 
	alert("密码填写不正确,请重新填写！可使用的字符为（A-Z a-z 0-9 _ - .)长度不小于4个字符，不超过15个字符，注意不要使用空格。"); 
	document.formlogin.password.select();
	return false; 
	} 
return true;
}