Base64(本地存储加密解密)
2024-05-10 20:35:07
js文件：
/** $Id: base64.js,v 2.15 2014/04/05 12:58:57 dankogai Exp dankogai $** Licensed under the MIT license.* http://opensource.org/licenses/mit-license** References:* http://en.wikipedia.org/wiki/Base64*/(function(global) {'use strict';// existing version for noConflict()var _Base64 = global.Base64;var version = "2.1.9";// if node.js, we use Buffervar buffer;if (typeof module !== 'undefined' && module.exports) {try {buffer = require('buffer').Buffer;} catch (err) {}}// constantsvar b64chars= 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';var b64tab = function(bin) {var t = {};for (var i = 0, l = bin.length; i < l; i++) t[bin.charAt(i)] = i;return t;}(b64chars);var fromCharCode = String.fromCharCode;// encoder stuffvar cb_utob = function(c) {if (c.length < 2) {var cc = c.charCodeAt(0);return cc < 0x80 ? c: cc < 0x800 ? (fromCharCode(0xc0 | (cc >>> 6))+ fromCharCode(0x80 | (cc & 0x3f))): (fromCharCode(0xe0 | ((cc >>> 12) & 0x0f))+ fromCharCode(0x80 | ((cc >>> 6) & 0x3f))+ fromCharCode(0x80 | ( cc & 0x3f)));} else {var cc = 0x10000+ (c.charCodeAt(0) - 0xD800) * 0x400+ (c.charCodeAt(1) - 0xDC00);return (fromCharCode(0xf0 | ((cc >>> 18) & 0x07))+ fromCharCode(0x80 | ((cc >>> 12) & 0x3f))+ fromCharCode(0x80 | ((cc >>> 6) & 0x3f))+ fromCharCode(0x80 | ( cc & 0x3f)));}};var re_utob = /[\uD800-\uDBFF][\uDC00-\uDFFFF]|[^\x00-\x7F]/g;var utob = function(u) {return u.replace(re_utob, cb_utob);};var cb_encode = function(ccc) {var padlen = [0, 2, 1][ccc.length % 3],ord = ccc.charCodeAt(0) << 16| ((ccc.length > 1 ? ccc.charCodeAt(1) : 0) << 8)| ((ccc.length > 2 ? ccc.charCodeAt(2) : 0)),chars = [b64chars.charAt( ord >>> 18),b64chars.charAt((ord >>> 12) & 63),padlen >= 2 ? '=' : b64chars.charAt((ord >>> 6) & 63),padlen >= 1 ? '=' : b64chars.charAt(ord & 63)];return chars.join('');};var btoa = global.btoa ? function(b) {return global.btoa(b);} : function(b) {return b.replace(/[\s\S]{1,3}/g, cb_encode);};var _encode = buffer ? function (u) {return (u.constructor === buffer.constructor ? u : new buffer(u)).toString('base64')}: function (u) { return btoa(utob(u)) };var encode = function(u, urisafe) {return !urisafe? _encode(String(u)): _encode(String(u)).replace(/[+\/]/g, function(m0) {return m0 == '+' ? '-' : '_';}).replace(/=/g, '');};var encodeURI = function(u) { return encode(u, true) };// decoder stuffvar re_btou = new RegExp(['[\xC0-\xDF][\x80-\xBF]','[\xE0-\xEF][\x80-\xBF]{2}','[\xF0-\xF7][\x80-\xBF]{3}'].join('|'), 'g');var cb_btou = function(cccc) {switch(cccc.length) {case 4:var cp = ((0x07 & cccc.charCodeAt(0)) << 18)| ((0x3f & cccc.charCodeAt(1)) << 12)| ((0x3f & cccc.charCodeAt(2)) << 6)| (0x3f & cccc.charCodeAt(3)),offset = cp - 0x10000;return (fromCharCode((offset >>> 10) + 0xD800)+ fromCharCode((offset & 0x3FF) + 0xDC00));case 3:return fromCharCode(((0x0f & cccc.charCodeAt(0)) << 12)| ((0x3f & cccc.charCodeAt(1)) << 6)| (0x3f & cccc.charCodeAt(2)));default:return fromCharCode(((0x1f & cccc.charCodeAt(0)) << 6)| (0x3f & cccc.charCodeAt(1)));}};var btou = function(b) {return b.replace(re_btou, cb_btou);};var cb_decode = function(cccc) {var len = cccc.length,padlen = len % 4,n = (len > 0 ? b64tab[cccc.charAt(0)] << 18 : 0)| (len > 1 ? b64tab[cccc.charAt(1)] << 12 : 0)| (len > 2 ? b64tab[cccc.charAt(2)] << 6 : 0)| (len > 3 ? b64tab[cccc.charAt(3)] : 0),chars = [fromCharCode( n >>> 16),fromCharCode((n >>> 8) & 0xff),fromCharCode( n & 0xff)];chars.length -= [0, 0, 2, 1][padlen];return chars.join('');};var atob = global.atob ? function(a) {return global.atob(a);} : function(a){return a.replace(/[\s\S]{1,4}/g, cb_decode);};var _decode = buffer ? function(a) {return (a.constructor === buffer.constructor? a : new buffer(a, 'base64')).toString();}: function(a) { return btou(atob(a)) };var decode = function(a){return _decode(String(a).replace(/[-_]/g, function(m0) { return m0 == '-' ? '+' : '/' }).replace(/[^A-Za-z0-9\+\/]/g, ''));};var noConflict = function() {var Base64 = global.Base64;global.Base64 = _Base64;return Base64;};// export Base64global.Base64 = {VERSION: version,atob: atob,btoa: btoa,fromBase64: decode,toBase64: encode,utob: utob,encode: encode,encodeURI: encodeURI,btou: btou,decode: decode,noConflict: noConflict};// if ES5 is available, make Base64.extendString() availableif (typeof Object.defineProperty === 'function') {var noEnum = function(v){return {value:v,enumerable:false,writable:true,configurable:true};};global.Base64.extendString = function () {Object.defineProperty(String.prototype, 'fromBase64', noEnum(function () {return decode(this)}));Object.defineProperty(String.prototype, 'toBase64', noEnum(function (urisafe) {return encode(this, urisafe)}));Object.defineProperty(String.prototype, 'toBase64URI', noEnum(function () {return encode(this, true)}));};}// that's it!if (global['Meteor']) {Base64 = global.Base64; // for normal export in Meteor.js}
})(this);===================================================================
使用demo
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
</body>
<script src="base64.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript">var common = common || {};/*** 加密方法*/
common.encrypt = function(key,value){localStorage.setItem(key,(Base64.encode(value)));}/*** 解密方法*/common.decipher = function(key){var rerunValue = localStorage.getItem(key);if(common.isNull(rerunValue)){rerunValue = null;}else{rerunValue = Base64.decode(rerunValue);}return rerunValue;}common.isNull = function(value){
return typeof value =='undefined' || value==="" ||value==null ||value==undefined;
}common.isNotNull = function (value){
return !common.isNull(value);
}common.encrypt('1',3);console.log(common.decipher('1'))
</script>
</html><!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
</body>
<script type="text/javascript">console.log(base64_encode('12345678'))
console.log(base64_decode('MTIzNDU2Nzg='))/** Javascript base64_encode() base64加密函数用于生成字符串对应的base64加密字符串* 吴先成 www.51-n.com ohcc@163.com QQ:229256237* @param string str 原始字符串* @return string 加密后的base64字符串*/function base64_encode(str){var c1, c2, c3;var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; var i = 0, len= str.length, string = '';while (i < len){c1 = str.charCodeAt(i++) & 0xff;if (i == len){string += base64EncodeChars.charAt(c1 >> 2);string += base64EncodeChars.charAt((c1 & 0x3) << 4);string += "==";break;}c2 = str.charCodeAt(i++);if (i == len){string += base64EncodeChars.charAt(c1 >> 2);string += base64EncodeChars.charAt(((c1 & 0x3) << 4) | ((c2 & 0xF0) >> 4));string += base64EncodeChars.charAt((c2 & 0xF) << 2);string += "=";break;}c3 = str.charCodeAt(i++);string += base64EncodeChars.charAt(c1 >> 2);string += base64EncodeChars.charAt(((c1 & 0x3) << 4) | ((c2 & 0xF0) >> 4));string += base64EncodeChars.charAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >> 6));string += base64EncodeChars.charAt(c3 & 0x3F)}return string}/** Javascript base64_decode() base64解密函数用于解密base64加密的字符串* 吴先成 www.51-n.com ohcc@163.com QQ:229256237* @param string str base64加密字符串* @return string 解密后的字符串*/function base64_decode(str){var c1, c2, c3, c4;var base64DecodeChars = 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);var i=0, len = str.length, string = '';while (i < len){do{c1 = base64DecodeChars[str.charCodeAt(i++) & 0xff]} while (i < len && c1 == -1);if (c1 == -1) break;do{c2 = base64DecodeChars[str.charCodeAt(i++) & 0xff]} while (i < len && c2 == -1);if (c2 == -1) break;string += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4));do{c3 = str.charCodeAt(i++) & 0xff;if (c3 == 61)return string;c3 = base64DecodeChars[c3]} while (i < len && c3 == -1);if (c3 == -1) break;string += String.fromCharCode(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2));do{c4 = str.charCodeAt(i++) & 0xff;if (c4 == 61) return string;c4 = base64DecodeChars[c4]} while (i < len && c4 == -1);if (c4 == -1) break;string += String.fromCharCode(((c3 & 0x03) << 6) | c4)}return string;}
</script>
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