前端AES的加密和解密

在工作的过程中,经常要对一些数据做一些加密,当然有复杂的加密和简单的加密,也有对称加密等等。总之加密的方式有很多。今天在这里,我只是简单的分享一个我最近遇到的加密方式-AES。这个也是后端工程师用的,因为涉及到接口获取到的数据有被加密过的,我得解密才能进行。所以就上网找了找前端js有关AES加密解密的代码。在这里把代码贴出来,虽然只有一点点。

1.需要依赖的js文件——aes.min.js

网上找到的aes.min.js的代码,文件很小,代码不多,如下:

aes.min.js

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//# sourceMappingURL=pad-pkcs7.min.js.map
!function(e,r,i){"object"==typeof exports?module.exports=exports=r(require("./core.min"),require("./enc-base64.min"),require("./md5.min"),require("./evpkdf.min"),require("./cipher-core.min")):"function"==typeof define&&define.amd?define(["./core.min","./enc-base64.min","./md5.min","./evpkdf.min","./cipher-core.min"],r):r(e.CryptoJS)}(this,function(e){return function(){var r=e,i=r.lib,n=i.BlockCipher,o=r.algo,t=[],c=[],s=[],f=[],a=[],d=[],u=[],v=[],h=[],y=[];!function(){for(var e=[],r=0;r<256;r++)r<128?e[r]=r<<1:e[r]=r<<1^283;for(var i=0,n=0,r=0;r<256;r++){var o=n^n<<1^n<<2^n<<3^n<<4;o=o>>>8^255&o^99,t[i]=o,c[o]=i;var p=e[i],l=e[p],_=e[l],k=257*e[o]^16843008*o;s[i]=k<<24|k>>>8,f[i]=k<<16|k>>>16,a[i]=k<<8|k>>>24,d[i]=k;var k=16843009*_^65537*l^257*p^16843008*i;u[o]=k<<24|k>>>8,v[o]=k<<16|k>>>16,h[o]=k<<8|k>>>24,y[o]=k,i?(i=p^e[e[e[_^p]]],n^=e[e[n]]):i=n=1}}();var p=[0,1,2,4,8,16,32,64,128,27,54],l=o.AES=n.extend({_doReset:function(){if(!this._nRounds||this._keyPriorReset!==this._key){for(var e=this._keyPriorReset=this._key,r=e.words,i=e.sigBytes/4,n=this._nRounds=i+6,o=4*(n+1),c=this._keySchedule=[],s=0;s<o;s++)if(s<i)c[s]=r[s];else{var f=c[s-1];s%i?i>6&&s%i==4&&(f=t[f>>>24]<<24|t[f>>>16&255]<<16|t[f>>>8&255]<<8|t[255&f]):(f=f<<8|f>>>24,f=t[f>>>24]<<24|t[f>>>16&255]<<16|t[f>>>8&255]<<8|t[255&f],f^=p[s/i|0]<<24),c[s]=c[s-i]^f}for(var a=this._invKeySchedule=[],d=0;d<o;d++){var s=o-d;if(d%4)var f=c[s];else var f=c[s-4];d<4||s<=4?a[d]=f:a[d]=u[t[f>>>24]]^v[t[f>>>16&255]]^h[t[f>>>8&255]]^y[t[255&f]]}}},encryptBlock:function(e,r){this._doCryptBlock(e,r,this._keySchedule,s,f,a,d,t)},decryptBlock:function(e,r){var i=e[r+1];e[r+1]=e[r+3],e[r+3]=i,this._doCryptBlock(e,r,this._invKeySchedule,u,v,h,y,c);var i=e[r+1];e[r+1]=e[r+3],e[r+3]=i},_doCryptBlock:function(e,r,i,n,o,t,c,s){for(var f=this._nRounds,a=e[r]^i[0],d=e[r+1]^i[1],u=e[r+2]^i[2],v=e[r+3]^i[3],h=4,y=1;y<f;y++){var p=n[a>>>24]^o[d>>>16&255]^t[u>>>8&255]^c[255&v]^i[h++],l=n[d>>>24]^o[u>>>16&255]^t[v>>>8&255]^c[255&a]^i[h++],_=n[u>>>24]^o[v>>>16&255]^t[a>>>8&255]^c[255&d]^i[h++],k=n[v>>>24]^o[a>>>16&255]^t[d>>>8&255]^c[255&u]^i[h++];a=p,d=l,u=_,v=k}var p=(s[a>>>24]<<24|s[d>>>16&255]<<16|s[u>>>8&255]<<8|s[255&v])^i[h++],l=(s[d>>>24]<<24|s[u>>>16&255]<<16|s[v>>>8&255]<<8|s[255&a])^i[h++],_=(s[u>>>24]<<24|s[v>>>16&255]<<16|s[a>>>8&255]<<8|s[255&d])^i[h++],k=(s[v>>>24]<<24|s[a>>>16&255]<<16|s[d>>>8&255]<<8|s[255&u])^i[h++];e[r]=p,e[r+1]=l,e[r+2]=_,e[r+3]=k},keySize:8});r.AES=n._createHelper(l)}(),e.AES});
//# sourceMappingURL=aes.min.js.map
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//# sourceMappingURL=enc-utf8.min.js.map

2.在自己的js文件中写两个方法(加密的和解密的)

utils.js

//说明:
//  1.如果加密解密涉及到前端和后端,则这里的key要保持和后端的key一致
//  2.AES的算法模式有好几种(ECB,CBC,CFB,OFB),所以也要和后端保持一致
//  3.AES的补码方式有两种(PKS5,PKS7),所以也要和后端保持一致
//  4.AES的密钥长度有三种(128,192,256,默认是128),所以也要和后端保持一致
//  5.AES的加密结果编码方式有两种(base64和十六进制),具体怎么选择由自己定,但是加密和解密的编码方式要统一
var key = CryptoJS.enc.Utf8.parse("1234567812345678");
/*加密*/
function aesEncode(str) {
    var encryptedData = CryptoJS.AES.encrypt(str, key, {
        mode: CryptoJS.mode.ECB,
        padding: CryptoJS.pad.Pkcs7
    });
    return encryptedData.ciphertext.toString();
}

/*解密*/
function aesDecode(encryptedStr) {
    var encryptedHexStr  = CryptoJS.enc.Hex.parse(encryptedStr);
    var encryptedBase64Str  = CryptoJS.enc.Base64.stringify(encryptedHexStr);
    var decryptedData  = CryptoJS.AES.decrypt(encryptedBase64Str, key, {
        mode: CryptoJS.mode.ECB,
        padding: CryptoJS.pad.Pkcs7
    });
    return decryptedData.toString(CryptoJS.enc.Utf8);
}

3.html页面(要引入aes.min.js和utils.js)

index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Aes-加密解密</title>
    <script src="aes/aes.min.js"></script>
    <script src="utils.js"></script>
    <style>
        div {
            margin-bottom: 20px;
        }
        div input[type='text']{
            width: 400px;
        }
        div label {
            margin-left: 20px;
        }
    </style>
</head>
<body>
<div>
    <input type="text" id="jia_value"><input type="button" value="加密" id="jia_btn">
    <label for="">加密结果:</label><span id="jia_result" class="result"></span>
</div>
<div>
    <input type="text" id="jie_value"><input type="button" value="解密" id="jie_btn">
    <label for="">解密结果:</label><span id="jie_result" class="result"></span>
</div>

<script>
    var jia_value = document.getElementById('jia_value');
    var jia_btn = document.getElementById('jia_btn');
    var jia_result = document.getElementById('jia_result');
    var jie_value = document.getElementById('jie_value');
    var jie_btn = document.getElementById('jie_btn');
    var jie_result = document.getElementById('jie_result');

    jia_btn.onclick = function () {
        var value = jia_value.value;
        var result = aesEncode(value);
        jia_result.textContent = result;
    }
    jie_btn.onclick = function () {
        var value = jie_value.value;
        var result = aesDecode(value);
        jie_result.textContent = result;
    }
</script>
</body>
</html>

4.效果

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