function sha(str){var rotate_left=function(n,s){var t4=(n<<s)|(n>>>(32-s));return t4;};var lsb_hex=function(val){var str="";var i;var vh;var vl;for(i=0;i<=6;i+=2){vh=(val>>>(i*4+4))&0x0f;vl=(val>>>(i*4))&0x0f;str+=vh.toString(16)+vl.toString(16);}
return str;};var cvt_hex=function(val){var str="";var i;var v;for(i=7;i>=0;i--){v=(val>>>(i*4))&0x0f;str+=v.toString(16);}
return str;};var blockstart;var i,j;var W=new Array(80);var H0=0x67452301;var H1=0xEFCDAB89;var H2=0x98BADCFE;var H3=0x10325476;var H4=0xC3D2E1F0;var A,B,C,D,E;var temp;str=utf8_encode(str);var str_len=str.length;var word_array=new Array();for(i=0;i<str_len-3;i+=4){j=str.charCodeAt(i)<<24|str.charCodeAt(i+1)<<16|str.charCodeAt(i+2)<<8|str.charCodeAt(i+3);word_array.push(j);}
switch(str_len%4){case 0:i=0x080000000;break;case 1:i=str.charCodeAt(str_len-1)<<24|0x0800000;break;case 2:i=str.charCodeAt(str_len-2)<<24|str.charCodeAt(str_len-1)<<16|0x08000;break;case 3:i=str.charCodeAt(str_len-3)<<24|str.charCodeAt(str_len-2)<<16|str.charCodeAt(str_len-1)<<8|0x80;break;}
word_array.push(i);while((word_array.length%16)!=14)word_array.push(0);word_array.push(str_len>>>29);word_array.push((str_len<<3)&0x0ffffffff);for(blockstart=0;blockstart<word_array.length;blockstart+=16){for(i=0;i<16;i++)W[i]=word_array[blockstart+i];for(i=16;i<=79;i++)W[i]=rotate_left(W[i-3]^W[i-8]^W[i-14]^W[i-16],1);A=H0;B=H1;C=H2;D=H3;E=H4;for(i=0;i<=19;i++){temp=(rotate_left(A,5)+((B&C)|(~B&D))+E+W[i]+0x5A827999)&0x0ffffffff;E=D;D=C;C=rotate_left(B,30);B=A;A=temp;}
for(i=20;i<=39;i++){temp=(rotate_left(A,5)+(B^C^D)+E+W[i]+0x6ED9EBA1)&0x0ffffffff;E=D;D=C;C=rotate_left(B,30);B=A;A=temp;}
for(i=40;i<=59;i++){temp=(rotate_left(A,5)+((B&C)|(B&D)|(C&D))+E+W[i]+0x8F1BBCDC)&0x0ffffffff;E=D;D=C;C=rotate_left(B,30);B=A;A=temp;}
for(i=60;i<=79;i++){temp=(rotate_left(A,5)+(B^C^D)+E+W[i]+0xCA62C1D6)&0x0ffffffff;E=D;D=C;C=rotate_left(B,30);B=A;A=temp;}
H0=(H0+A)&0x0ffffffff;H1=(H1+B)&0x0ffffffff;H2=(H2+C)&0x0ffffffff;H3=(H3+D)&0x0ffffffff;H4=(H4+E)&0x0ffffffff;}
var temp=cvt_hex(H0)+cvt_hex(H1)+cvt_hex(H2)+cvt_hex(H3)+cvt_hex(H4);return temp.toLowerCase();}

$(document).ready(function() {
	$('#navUser_username, #navUser_password').keydown(function(event) {
		if (event.keyCode==13) {
			return login();
		}
	});
});

function login() {
	if (jQueryCheckForm('navUser_username', 'navUser_password', 'navUser_sha1', 'navUser_random')) {
		$("#login_form_system").submit();
	} else {
		return false;
	}
}

function jQueryCheckForm(username, password, shas, random) {
    username = '#' + username;
    password = '#' + password;
    shas = '#' + shas;
    random = '#' + random;

    try {
        var bMissing = false;
        if ($(username).val().length == 0) bMissing = true;
        if ($(password).val().length == 0) bMissing = true;

        if (bMissing) {
            alert("Username and Password are required!\n" +
            "Please enter the required details and submit again.");
            return false;
        } else {
            $(shas).val(sha($(random).val().concat(sha($(password).val()))));
            $(random).val('');
            $(password).val('');
        }
    } catch(e) {
        alert(e + '\nPlease reload the page by pressing Ctrl+F5 on your keyboard and try again.');
        return false;
    }
    
    return true;
}