JS实现的base64加密、md5加密及sha1加密详解

2024-05-06 14:59:05

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本文实例讲述了JS实现的base64加密、md5加密及sha1加密。分享给大家供大家参考，具体如下：

1、base64加密

在页面中引入base64.js文件，调用方法为：

<!DOCTYPE HTML><html><head><meta charset="utf-8"><title>base64加密</title><script type="text/javascript" src="base64.js"></script><script type="text/javascript">  var b = new Base64();  var str = b.encode("admin:admin");  alert("base64 encode:" + str);//解密  str = b.decode(str);  alert("base64 decode:" + str);</script></head><body></body></html>

2、md5加密

在页面中引用md5.js文件，调用方法为

<!DOCTYPE HTML><html><head><meta charset="utf-8"><title>md5加密</title><script type="text/ecmascript" src="md5.js"></script><script type="text/javascript"> var hash = hex_md5("123dafd"); alert(hash)</script></head><body></body></html>

3、sha1加密

据说这是最安全的加密

页面中引入sha1.js，调用方法为

<!DOCTYPE HTML><html><head><meta charset="utf-8"><title>sha1加密</title><script type="text/ecmascript" src="sha1.js"></script><script type="text/javascript"> var sha = hex_sha1('mima123465') alert(sha)</script></head><body></body></html>

一下为js们的源代码

base64.js：

/**** Base64 encode / decode** @author haitao.tu* @date 2010-04-26* @email tuhaitao@foxmail.com**/function Base64() { // private property _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="; // public method for encoding this.encode = function (input) {  var output = "";  var chr1, chr2, chr3, enc1, enc2, enc3, enc4;  var i = 0;  input = _utf8_encode(input);  while (i < input.length) {   chr1 = input.charCodeAt(i++);   chr2 = input.charCodeAt(i++);   chr3 = input.charCodeAt(i++);   enc1 = chr1 >> 2;   enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);   enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);   enc4 = chr3 & 63;   if (isNaN(chr2)) {    enc3 = enc4 = 64;   } else if (isNaN(chr3)) {    enc4 = 64;   }   output = output +   _keyStr.charAt(enc1) + _keyStr.charAt(enc2) +   _keyStr.charAt(enc3) + _keyStr.charAt(enc4);  }  return output; } // public method for decoding this.decode = function (input) {  var output = "";  var chr1, chr2, chr3;  var enc1, enc2, enc3, enc4;  var i = 0;  input = input.replace(/[^A-Za-z0-9/+///=]/g, "");  while (i < input.length) {   enc1 = _keyStr.indexOf(input.charAt(i++));   enc2 = _keyStr.indexOf(input.charAt(i++));   enc3 = _keyStr.indexOf(input.charAt(i++));   enc4 = _keyStr.indexOf(input.charAt(i++));   chr1 = (enc1 << 2) | (enc2 >> 4);   chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);   chr3 = ((enc3 & 3) << 6) | enc4;   output = output + String.fromCharCode(chr1);   if (enc3 != 64) {    output = output + String.fromCharCode(chr2);   }   if (enc4 != 64) {    output = output + String.fromCharCode(chr3);   }  }  output = _utf8_decode(output);  return output; } // private method for UTF-8 encoding _utf8_encode = function (string) {  string = string.replace(//r/n/g,"/n");  var utftext = "";  for (var n = 0; n < string.length; n++) {   var c = string.charCodeAt(n);   if (c < 128) {    utftext += String.fromCharCode(c);   } else if((c > 127) && (c < 2048)) {    utftext += String.fromCharCode((c >> 6) | 192);    utftext += String.fromCharCode((c & 63) | 128);   } else {    utftext += String.fromCharCode((c >> 12) | 224);    utftext += String.fromCharCode(((c >> 6) & 63) | 128);    utftext += String.fromCharCode((c & 63) | 128);   }  }  return utftext; } // private method for UTF-8 decoding _utf8_decode = function (utftext) {  var string = "";  var i = 0;  var c = c1 = c2 = 0;  while ( i < utftext.length ) {   c = utftext.charCodeAt(i);   if (c < 128) {    string += String.fromCharCode(c);    i++;   } else if((c > 191) && (c < 224)) {    c2 = utftext.charCodeAt(i+1);    string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));    i += 2;   } else {    c2 = utftext.charCodeAt(i+1);    c3 = utftext.charCodeAt(i+2);    string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));    i += 3;   }  }  return string; }}

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