加密html
2009年4月4日 周六 22:18 <HTML>
<HEAD>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <TITLE>文本加密</TITLE> <SCRIPT LANGUAGE="JavaScript">
function TEAencrypt(plaintext, password)
{
if (plaintext.length == 0) return(''); // nothing to encrypt
// 'escape' plaintext so chars outside ISO-8859-1 work in single-byte packing, but keep
// spaces as spaces (not '%20') so encrypted text doesn't grow too long (quick & dirty)
var asciitext = escape(plaintext).replace(/%20/g,' ');
var v = strToLongs(asciitext); // convert string to array of longs
if (v.length <= 1) v[1] = 0; // algorithm doesn't work for n<2 so fudge by adding a null
var k = strToLongs(password.slice(0,16)); // simply convert first 16 chars of password as key
var n = v.length; var z = v[n-1], y = v[0], delta = 0x9E3779B9;
var mx, e, q = Math.floor(6 + 52/n), sum = 0; while (q-- > 0) { // 6 + 52/n operations gives between 6 & 32 mixes on each word
sum += delta;
e = sum>>>2 & 3;
for (var p = 0; p < n; p++) {
y = v[(p+1)%n];
mx = (z>>>5 ^ y<<2) + (y>>>3 ^ z<<4) ^ (sum^y) + (k[p&3 ^ e] ^ z);
z = v[p] += mx;
}
} var ciphertext = longsToStr(v); return escCtrlCh(ciphertext);
} //
// TEAdecrypt: Use Corrected Block TEA to decrypt ciphertext using password
//
function TEAdecrypt(ciphertext, password)
{
if (ciphertext.length == 0) return('');
var v = strToLongs(unescCtrlCh(ciphertext));
var k = strToLongs(password.slice(0,16));
var n = v.length; var z = v[n-1], y = v[0], delta = 0x9E3779B9;
var mx, e, q = Math.floor(6 + 52/n), sum = q*delta; while (sum != 0) {
e = sum>>>2 & 3;
for (var p = n-1; p >= 0; p--) {
z = v[p>0 ? p-1 : n-1];
mx = (z>>>5 ^ y<<2) + (y>>>3 ^ z<<4) ^ (sum^y) + (k[p&3 ^ e] ^ z);
y = v[p] -= mx;
}
sum -= delta;
} var plaintext = longsToStr(v); // strip trailing null chars resulting from filling 4-char blocks:
plaintext = plaintext.replace(/\0+$/,''); return unescape(plaintext);
} // supporting functions function strToLongs(s) { // convert string to array of longs, each containing 4 chars
// note chars must be within ISO-8859-1 (with Unicode code-point < 256) to fit 4/long
var l = new Array(Math.ceil(s.length/4));
for (var i=0; i<l.length; i++) {
// note little-endian encoding - endianness is irrelevant as long as
// it is the same in longsToStr()
l[i] = s.charCodeAt(i*4) + (s.charCodeAt(i*4+1)<<8) +
(s.charCodeAt(i*4+2)<<16) + (s.charCodeAt(i*4+3)<<24);
}
return l; // note running off the end of the string generates nulls since
} // bitwise operators treat NaN as 0 function longsToStr(l) { // convert array of longs back to string
var a = new Array(l.length);
for (var i=0; i<l.length; i++) {
a[i] = String.fromCharCode(l[i] & 0xFF, l[i]>>>8 & 0xFF,
l[i]>>>16 & 0xFF, l[i]>>>24 & 0xFF);
}
return a.join(''); // use Array.join() rather than repeated string appends for efficiency
} function escCtrlCh(str) { // escape control chars etc which might cause problems with encrypted texts
return str.replace(/[\0\t\n\v\f\r\xa0'"!]/g, function(c) { return '!' + c.charCodeAt(0) + '!'; });
} function unescCtrlCh(str) { // unescape potentially problematic nulls and control characters
return str.replace(/!\d\d?\d?!/g, function(c) { return String.fromCharCode(c.slice(1,-1)); });
} var Base64 = function(){}
Base64.encodeChars =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
Base64.decodeChars = new Array( - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1,
- 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1,
- 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1,
- 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, - 1, 62, - 1, - 1, - 1,
63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, - 1, - 1, - 1, - 1, - 1,
- 1, - 1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
19, 20, 21, 22, 23, 24, 25, - 1, - 1, - 1, - 1, - 1, - 1, 26, 27, 28,
29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
48, 49, 50, 51, - 1, - 1, - 1, - 1, - 1); Base64.encode = function(str)
{
var out, i, len;
var c1, c2, c3; len = str.length;
i = 0;
out = "";
while (i < len)
{
c1 = str.charCodeAt(i++) & 0xff;
if (i == len)
{
out += Base64.encodeChars.charAt(c1 >> 2);
out += Base64.encodeChars.charAt((c1 & 0x3) << 4);
out += "==";
break;
}
c2 = str.charCodeAt(i++);
if (i == len)
{
out += Base64.encodeChars.charAt(c1 >> 2);
out += Base64.encodeChars.charAt(((c1 & 0x3) << 4) | ((c2 & 0xF0)
>> 4));
out += Base64.encodeChars.charAt((c2 & 0xF) << 2);
out += "=";
break;
}
c3 = str.charCodeAt(i++);
out += Base64.encodeChars.charAt(c1 >> 2);
out += Base64.encodeChars.charAt(((c1 & 0x3) << 4) | ((c2 & 0xF0) >> 4))
;
out += Base64.encodeChars.charAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >> 6))
;
out += Base64.encodeChars.charAt(c3 & 0x3F);
}
return out;
} Base64.decode = function(str)
{
var c1, c2, c3, c4;
var i, len, out; len = str.length;
i = 0;
out = "";
while (i < len)
{
/* c1 */
do
{
c1 = Base64.decodeChars[str.charCodeAt(i++) & 0xff];
}
while (i < len && c1 == - 1);
if (c1 == - 1)
break; /* c2 */
do
{
c2 = Base64.decodeChars[str.charCodeAt(i++) & 0xff];
}
while (i < len && c2 == - 1);
if (c2 == - 1)
break; out += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4)); /* c3 */
do
{
c3 = str.charCodeAt(i++) & 0xff;
if (c3 == 61)
return out;
c3 = Base64.decodeChars[c3];
}
while (i < len && c3 == - 1);
if (c3 == - 1)
break; out += String.fromCharCode(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2)); /* c4 */
do
{
c4 = str.charCodeAt(i++) & 0xff;
if (c4 == 61)
return out;
c4 = Base64.decodeChars[c4];
}
while (i < len && c4 == - 1);
if (c4 == - 1)
break;
out += String.fromCharCode(((c3 & 0x03) << 6) | c4);
}
return out;
} Base64.utf16to8 = function(str)
{
var out, i, len, c; out = "";
len = str.length;
for (i = 0; i < len; i++)
{
c = str.charCodeAt(i);
if ((c >= 0x0001) && (c <= 0x007F))
{
out += str.charAt(i);
}
else if (c > 0x07FF)
{
out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F));
out += String.fromCharCode(0x80 | ((c >> 6) & 0x3F));
out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
}
else
{
out += String.fromCharCode(0xC0 | ((c >> 6) & 0x1F));
out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
}
}
return out;
} Base64.utf8to16 = function(str)
{
var out, i, len, c;
var char2, char3; out = "";
len = str.length;
i = 0;
while (i < len)
{
c = str.charCodeAt(i++);
switch (c >> 4)
{
case 0:
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
case 7:
// 0xxxxxxx
out += str.charAt(i - 1);
break;
case 12:
case 13:
// 110x xxxx 10xx xxxx
char2 = str.charCodeAt(i++);
out += String.fromCharCode(((c & 0x1F) << 6) | (char2 & 0x3F));
break;
case 14:
// 1110 xxxx 10xx xxxx 10xx xxxx
char2 = str.charCodeAt(i++);
char3 = str.charCodeAt(i++);
out += String.fromCharCode(((c & 0x0F) << 12) | ((char2 & 0x3F)
<< 6) | ((char3 & 0x3F) << 0));
break;
}
} return out;
} function doSecure()
{
var str = TEAencrypt(document.getElementById("txtUnsecure").value, document.getElementById("txtPassw").value);
document.getElementById("txtSecure").value = Base64.encode(Base64.utf16to8(str));
} function doUnsecure()
{
var str = Base64.utf8to16(Base64.decode(document.getElementById("txtSecure").value));
document.getElementById("txtUnsecure").value = TEAdecrypt(str, document.getElementById("txtPassw").value); }
</script> </HEAD>
<BODY > <center>
<table border=1 width="571">
<tr>
<td>
<form name=frmSecurity>
<p><font color=#ff0000>密码:</font>
<input type=password id=txtPassw size=20 value="">
<table border=0>
<tr>
<p><font color=#0000ff>原文</font>
</tr>
<tr>
<textarea rows=20 id=txtUnsecure cols=120 wrap=virtual>我是一个美女！</textarea>
</tr>
<tr align=center>
<input type=button value=" 加密 "
name=btnSecure onclick="doSecure()">
<br>
<input type=button value=" 解密 "
name=btnUnsecure onclick="doUnsecure()">
</tr>
<tr>
<p><font color=#0000ff>加密之后</font>
</tr>
<tr>
<textarea rows=20 id=txtSecure cols=120 wrap=virtual></textarea></td>
</tr>
</table>
</form>
</td>
</tr>
</table>
</center>
</BODY></HTML>
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