User Login Form with Javascript Md5
31
May14
May14
Web servers uses Plain-Text form based authentication. If an attacker with access to the network traffic to and from the target host may be able to obtain login credentials for other users by sniffing the network traffic. Solutions is data sent via HTML login forms is encrypted before being sent from the client to the host. We solve this problem using encoding form with md5. But there is no standart md5() function in javascript, we find javascript md5 function with a little search (Md5 mit Javascript). We create a hidden form to our secure login. When we submit the forum our code change our “user” and “password” to md5 and send with hidden form encoded values.
Our Login Code (login.html)
<html>
<head>
<title>Login Form</title>
<script language="javascript" src="md5.js"></script>
<script language="javascript">
<!--
function passResponse() {
document.hform.user.value = MD5(document.login.user_temp.value);
document.hform.pass.value = MD5(document.login.pass_temp.value);
document.login.pass_temp.value = "";
document.hform.submit();
}
// -->
</script>
</head>
<body>
<form name="login">
Username:
<input type="text" name="user_temp" size=32 maxlength=32><br>
Password:
<input type="password" name="pass_temp" size=32 maxlength=32><br>
<input onClick="passResponse(); return false;" type="submit" name="submitbtn" value="Login now">
</form>
<form action="login.php" METHOD="POST" name="hform">
<input type="hidden" name="user">
<input type="hidden" name="pass">
</form>
</body>
</html>
login.php
<?
$user = $_POST["user"];
$pass = $_POST["pass"];
mysql_query("SELECT * FROM users WHERE MD5(username) = '$user' AND password = '$pass'");
//... Code is continue ...
?>
md5.js file
/*
* md5.js 1.0b 27/06/96
*
* Javascript implementation of the RSA Data Security, Inc. MD5
* Message-Digest Algorithm.
*
* Copyright (c) 1996 Henri Torgemane. All Rights Reserved.
*
* Permission to use, copy, modify, and distribute this software
* and its documentation for any purposes and without
* fee is hereby granted provided that this copyright notice
* appears in all copies.
*
* Of course, this soft is provided "as is" without express or implied
* warranty of any kind.
*
*
* Modified with german comments and some information about collisions.
* (Ralf Mieke, ralf@miekenet.de, http://mieke.home.pages.de)
*/
function array(n) {
for(i=0;i<n;i++) this[i]=0;
this.length=n;
}
/* Einige grundlegenden Funktionen müssen wegen
* Javascript Fehlern umgeschrieben werden.
* Man versuche z.B. 0xffffffff >> 4 zu berechnen..
* Die nun verwendeten Funktionen sind zwar langsamer als die Originale,
* aber sie funktionieren.
*/
function integer(n) { return n%(0xffffffff+1); }
function shr(a,b) {
a=integer(a);
b=integer(b);
if (a-0x80000000>=0) {
a=a%0x80000000;
a>>=b;
a+=0x40000000>>(b-1);
} else
a>>=b;
return a;
}
function shl1(a) {
a=a%0x80000000;
if (a&0x40000000==0x40000000)
{
a-=0x40000000;
a*=2;
a+=0x80000000;
} else
a*=2;
return a;
}
function shl(a,b) {
a=integer(a);
b=integer(b);
for (var i=0;i<b;i++) a=shl1(a);
return a;
}
function and(a,b) {
a=integer(a);
b=integer(b);
var t1=(a-0x80000000);
var t2=(b-0x80000000);
if (t1>=0)
if (t2>=0)
return ((t1&t2)+0x80000000);
else
return (t1&b);
else
if (t2>=0)
return (a&t2);
else
return (a&b);
}
function or(a,b) {
a=integer(a);
b=integer(b);
var t1=(a-0x80000000);
var t2=(b-0x80000000);
if (t1>=0)
if (t2>=0)
return ((t1|t2)+0x80000000);
else
return ((t1|b)+0x80000000);
else
if (t2>=0)
return ((a|t2)+0x80000000);
else
return (a|b);
}
function xor(a,b) {
a=integer(a);
b=integer(b);
var t1=(a-0x80000000);
var t2=(b-0x80000000);
if (t1>=0)
if (t2>=0)
return (t1^t2);
else
return ((t1^b)+0x80000000);
else
if (t2>=0)
return ((a^t2)+0x80000000);
else
return (a^b);
}
function not(a) {
a=integer(a);
return (0xffffffff-a);
}
/* Beginn des Algorithmus */
var state = new array(4);
var count = new array(2);
count[0] = 0;
count[1] = 0;
var buffer = new array(64);
var transformBuffer = new array(16);
var digestBits = new array(16);
var S11 = 7;
var S12 = 12;
var S13 = 17;
var S14 = 22;
var S21 = 5;
var S22 = 9;
var S23 = 14;
var S24 = 20;
var S31 = 4;
var S32 = 11;
var S33 = 16;
var S34 = 23;
var S41 = 6;
var S42 = 10;
var S43 = 15;
var S44 = 21;
function F(x,y,z) {
return or(and(x,y),and(not(x),z));
}
function G(x,y,z) {
return or(and(x,z),and(y,not(z)));
}
function H(x,y,z) {
return xor(xor(x,y),z);
}
function I(x,y,z) {
return xor(y ,or(x , not(z)));
}
function rotateLeft(a,n) {
return or(shl(a, n),(shr(a,(32 - n))));
}
function FF(a,b,c,d,x,s,ac) {
a = a+F(b, c, d) + x + ac;
a = rotateLeft(a, s);
a = a+b;
return a;
}
function GG(a,b,c,d,x,s,ac) {
a = a+G(b, c, d) +x + ac;
a = rotateLeft(a, s);
a = a+b;
return a;
}
function HH(a,b,c,d,x,s,ac) {
a = a+H(b, c, d) + x + ac;
a = rotateLeft(a, s);
a = a+b;
return a;
}
function II(a,b,c,d,x,s,ac) {
a = a+I(b, c, d) + x + ac;
a = rotateLeft(a, s);
a = a+b;
return a;
}
function transform(buf,offset) {
var a=0, b=0, c=0, d=0;
var x = transformBuffer;
a = state[0];
b = state[1];
c = state[2];
d = state[3];
for (i = 0; i < 16; i++) {
x[i] = and(buf[i*4+offset],0xff);
for (j = 1; j < 4; j++) {
x[i]+=shl(and(buf[i*4+j+offset] ,0xff), j * 8);
}
}
/* Runde 1 */
a = FF ( a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
d = FF ( d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
c = FF ( c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
b = FF ( b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
a = FF ( a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
d = FF ( d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
c = FF ( c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
b = FF ( b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
a = FF ( a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
d = FF ( d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
c = FF ( c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
b = FF ( b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
a = FF ( a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
d = FF ( d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
c = FF ( c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
b = FF ( b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
/* Runde 2 */
a = GG ( a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
d = GG ( d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
c = GG ( c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
b = GG ( b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
a = GG ( a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
d = GG ( d, a, b, c, x[10], S22, 0x2441453); /* 22 */
c = GG ( c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
b = GG ( b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
a = GG ( a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
d = GG ( d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
c = GG ( c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
b = GG ( b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
a = GG ( a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
d = GG ( d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
c = GG ( c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
b = GG ( b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
/* Runde 3 */
a = HH ( a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
d = HH ( d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
c = HH ( c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
b = HH ( b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
a = HH ( a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
d = HH ( d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
c = HH ( c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
b = HH ( b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
a = HH ( a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
d = HH ( d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
c = HH ( c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
b = HH ( b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
a = HH ( a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
d = HH ( d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
c = HH ( c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
b = HH ( b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
/* Runde 4 */
a = II ( a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
d = II ( d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
c = II ( c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
b = II ( b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
a = II ( a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
d = II ( d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
c = II ( c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
b = II ( b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
a = II ( a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
d = II ( d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
c = II ( c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
b = II ( b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
a = II ( a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
d = II ( d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
c = II ( c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
b = II ( b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
state[0] +=a;
state[1] +=b;
state[2] +=c;
state[3] +=d;
}
/* Mit der Initialisierung von Dobbertin:
state[0] = 0x12ac2375;
state[1] = 0x3b341042;
state[2] = 0x5f62b97c;
state[3] = 0x4ba763ed;
gibt es eine Kollision:
begin 644 Message1
M7MH=JO6_>MG!X?!51$)W,CXV!A"=(!AR71,<X`Y-IIT9^Z&8L$2N'Y*Y:R.;
39GIK9>TF$W()/MEHR%C4:G1R:Q"=
`
end
begin 644 Message2
M7MH=JO6_>MG!X?!51$)W,CXV!A"=(!AR71,<X`Y-IIT9^Z&8L$2N'Y*Y:R.;
39GIK9>TF$W()/MEHREC4:G1R:Q"=
`
end
*/
function init() {
count[0]=count[1] = 0;
state[0] = 0x67452301;
state[1] = 0xefcdab89;
state[2] = 0x98badcfe;
state[3] = 0x10325476;
for (i = 0; i < digestBits.length; i++)
digestBits[i] = 0;
}
function update(b) {
var index,i;
index = and(shr(count[0],3) , 0x3f);
if (count[0]<0xffffffff-7)
count[0] += 8;
else {
count[1]++;
count[0]-=0xffffffff+1;
count[0]+=8;
}
buffer[index] = and(b,0xff);
if (index >= 63) {
transform(buffer, 0);
}
}
function finish() {
var bits = new array(8);
var padding;
var i=0, index=0, padLen=0;
for (i = 0; i < 4; i++) {
bits[i] = and(shr(count[0],(i * 8)), 0xff);
}
for (i = 0; i < 4; i++) {
bits[i+4]=and(shr(count[1],(i * 8)), 0xff);
}
index = and(shr(count[0], 3) ,0x3f);
padLen = (index < 56) ? (56 - index) : (120 - index);
padding = new array(64);
padding[0] = 0x80;
for (i=0;i<padLen;i++)
update(padding[i]);
for (i=0;i<8;i++)
update(bits[i]);
for (i = 0; i < 4; i++) {
for (j = 0; j < 4; j++) {
digestBits[i*4+j] = and(shr(state[i], (j * 8)) , 0xff);
}
}
}
/* Ende des MD5 Algorithmus */
function hexa(n) {
var hexa_h = "0123456789abcdef";
var hexa_c="";
var hexa_m=n;
for (hexa_i=0;hexa_i<8;hexa_i++) {
hexa_c=hexa_h.charAt(Math.abs(hexa_m)%16)+hexa_c;
hexa_m=Math.floor(hexa_m/16);
}
return hexa_c;
}
var ascii="01234567890123456789012345678901" +
" !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ"+
"[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~";
function MD5(nachricht)
{
var l,s,k,ka,kb,kc,kd;
init();
for (k=0;k<nachricht.length;k++) {
l=nachricht.charAt(k);
update(ascii.lastIndexOf(l));
}
finish();
ka=kb=kc=kd=0;
for (i=0;i<4;i++) ka+=shl(digestBits[15-i], (i*8));
for (i=4;i<8;i++) kb+=shl(digestBits[15-i], ((i-4)*8));
for (i=8;i<12;i++) kc+=shl(digestBits[15-i], ((i-8)*8));
for (i=12;i<16;i++) kd+=shl(digestBits[15-i], ((i-12)*8));
s=hexa(kd)+hexa(kc)+hexa(kb)+hexa(ka);
return s;
}
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