Base64(本地存储加密解密)

来源：互联网发布：北风网大数据项目实战编辑：程序博客网时间：2024/06/05 17:40

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 Buffer    var buffer;    if (typeof module !== 'undefined' && module.exports) {        try {            buffer = require('buffer').Buffer;        } catch (err) {}    }    // constants    var 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 stuff    var 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 stuff    var 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 Base64    global.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() available    if (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></html>

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