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一段有用的javascript加密解密
今天在做一个老项目时,遇到一个需求,在javascript将url中的参数加密解密,从网上找发现了这段有用的代码:
[javascript] view plaincopy
- <SCRIPT LANGUAGE="JavaScript">
- <!-- Begin
- function Encrypt(str, pwd) {
- if(str=="")return "";
- str = escape(str);
- if(!pwd || pwd==""){ var pwd="1234"; }
- pwd = escape(pwd);
- if(pwd == null || pwd.length <= 0) {
- alert("Please enter a password with which to encrypt the message.");
- return null;
- }
- var prand = "";
- for(var I=0; I<pwd.length; I++) {
- prand += pwd.charCodeAt(I).toString();
- }
- var sPos = Math.floor(prand.length / 5);
- var mult = parseInt(prand.charAt(sPos) + prand.charAt(sPos*2) + prand.charAt(sPos*3) + prand.charAt(sPos*4) + prand.charAt(sPos*5));
- var incr = Math.ceil(pwd.length / 2);
- var modu = Math.pow(2, 31) - 1;
- if(mult < 2) {
- alert("Algorithm cannot find a suitable hash. Please choose a different password. /nPossible considerations are to choose a more complex or longer password.");
- return null;
- }
- var salt = Math.round(Math.random() * 1000000000) % 100000000;
- prand += salt;
- while(prand.length > 10) {
- prand = (parseInt(prand.substring(0, 10)) + parseInt(prand.substring(10, prand.length))).toString();
- }
- prand = (mult * prand + incr) % modu;
- var enc_chr = "";
- var enc_str = "";
- for(var I=0; I<str.length; I++) {
- enc_chr = parseInt(str.charCodeAt(I) ^ Math.floor((prand / modu) * 255));
- if(enc_chr < 16) {
- enc_str += "0" + enc_chr.toString(16);
- }else
- enc_str += enc_chr.toString(16);
- prand = (mult * prand + incr) % modu;
- }
- salt = salt.toString(16);
- while(salt.length < 8)salt = "0" + salt;
- enc_str += salt;
- return enc_str;
- }
- function Decrypt(str, pwd) {
- if(str=="")return "";
- if(!pwd || pwd==""){ var pwd="1234"; }
- pwd = escape(pwd);
- if(str == null || str.length < 8) {
- alert("A salt value could not be extracted from the encrypted message because it‘s length is too short. The message cannot be decrypted.");
- return;
- }
- if(pwd == null || pwd.length <= 0) {
- alert("Please enter a password with which to decrypt the message.");
- return;
- }
- var prand = "";
- for(var I=0; I<pwd.length; I++) {
- prand += pwd.charCodeAt(I).toString();
- }
- var sPos = Math.floor(prand.length / 5);
- var mult = parseInt(prand.charAt(sPos) + prand.charAt(sPos*2) + prand.charAt(sPos*3) + prand.charAt(sPos*4) + prand.charAt(sPos*5));
- var incr = Math.round(pwd.length / 2);
- var modu = Math.pow(2, 31) - 1;
- var salt = parseInt(str.substring(str.length - 8, str.length), 16);
- str = str.substring(0, str.length - 8);
- prand += salt;
- while(prand.length > 10) {
- prand = (parseInt(prand.substring(0, 10)) + parseInt(prand.substring(10, prand.length))).toString();
- }
- prand = (mult * prand + incr) % modu;
- var enc_chr = "";
- var enc_str = "";
- for(var I=0; I<str.length; I+=2) {
- enc_chr = parseInt(parseInt(str.substring(I, I+2), 16) ^ Math.floor((prand / modu) * 255));
- enc_str += String.fromCharCode(enc_chr);
- prand = (mult * prand + incr) % modu;
- }
- return unescape(enc_str);
- }
- // End -->
- </script>
以后碰到加密解密问题,直接将上述代码写成一个js文件,就搞定。省事了。。。。
一段有用的javascript加密解密
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