cryptojs.pad的簡單介紹

本文目錄一覽：

• 1、如何使用CryptoJS的AES方法進行加密和解密
• 2、前端JS AES加密 後端PHP AES加解密
• 3、為什麼 CryptoJS DES 加密的結果和 Java DES 不一樣

如何使用CryptoJS的AES方法進行加密和解密

首先準備一份明文和秘鑰：

var plaintText = ‘aaaaaaaaaaaaaaaa’; // 明文

var keyStr = ‘bbbbbbbbbbbbbbbb’; // 一般key為一個字元串

參看官網文檔，AES方法是支持AES-128、AES-192和AES-256的，加密過程中使用哪種加密方式取決於傳入key的類型，否則就會按照AES-256的方式加密。

CryptoJS supports AES-128, AES-192, and AES-256. It will pick the variant by the size of the key you pass in. If you use a passphrase, then it will generate a 256-bit key.

由於Java就是按照128bit給的，但是由於是一個字元串，需要先在前端將其轉為128bit的才行。

最開始以為使用CryptoJS.enc.Hex.parse就可以正確地將其轉為128bit的key。但是不然…

經過多次嘗試，需要使用CryptoJS.enc.Utf8.parse方法才可以將key轉為128bit的。好吧，既然說了是多次嘗試，那麼就不知道原因了，後期再對其進行更深入的研究。

// 字元串類型的key用之前需要用uft8先parse一下才能用

var key = CryptoJS.enc.Utf8.parse(keyStr);

由於後端使用的是PKCS5Padding，但是在使用CryptoJS的時候發現根本沒有這個偏移，查詢後發現PKCS5Padding和PKCS7Padding是一樣的東東，使用時默認就是按照PKCS7Padding進行偏移的。

// 加密

var encryptedData = CryptoJS.AES.encrypt(plaintText, key, {

mode: CryptoJS.mode.ECB,

padding: CryptoJS.pad.Pkcs7

});

由於CryptoJS生成的密文是一個對象，如果直接將其轉為字元串是一個Base64編碼過的，在encryptedData.ciphertext上的屬性轉為字元串才是後端需要的格式。

var encryptedBase64Str = encryptedData.toString();

// 輸出：’RJcecVhTqCHHnlibzTypzuDvG8kjWC+ot8JuxWVdLgY=’

console.log(encryptedBase64Str);

// 需要讀取encryptedData上的ciphertext.toString()才能拿到跟Java一樣的密文

var encryptedStr = encryptedData.ciphertext.toString();

// 輸出：’44971e715853a821c79e589bcd3ca9cee0ef1bc923582fa8b7c26ec5655d2e06′

console.log(encryptedStr);

由於加密後的密文為128位的字元串，那麼解密時，需要將其轉為Base64編碼的格式。

那麼就需要先使用方法CryptoJS.enc.Hex.parse轉為十六進位，再使用CryptoJS.enc.Base64.stringify將其變為Base64編碼的字元串，此時才可以傳入CryptoJS.AES.decrypt方法中對其進行解密。

// 拿到字元串類型的密文需要先將其用Hex方法parse一下

var encryptedHexStr = CryptoJS.enc.Hex.parse(encryptedStr);

// 將密文轉為Base64的字元串

// 只有Base64類型的字元串密文才能對其進行解密

var encryptedBase64Str = CryptoJS.enc.Base64.stringify(encryptedHexStr);

使用轉為Base64編碼後的字元串即可傳入CryptoJS.AES.decrypt方法中進行解密操作。

// 解密

var decryptedData = CryptoJS.AES.decrypt(encryptedBase64Str, key, {

mode: CryptoJS.mode.ECB,

padding: CryptoJS.pad.Pkcs7

});

經過CryptoJS解密後，依然是一個對象，將其變成明文就需要按照Utf8格式轉為字元串。

// 解密後，需要按照Utf8的方式將明文轉位字元串

var decryptedStr = decryptedData.toString(CryptoJS.enc.Utf8);

console.log(decryptedStr); // ‘aaaaaaaaaaaaaaaa’

前端JS AES加密 後端PHP AES加解密

!DOCTYPEhtml

html

head

    titleaes demo/title

/head

body

    script type=”text/javascript” src=”./CryptoJS/aes.js”/script

    script type=”text/javascript” src=”./CryptoJS/pad-zeropadding.js”/script

    script type=”text/javascript”

    text = ‘did=12345dgversion=1’;

    var key = ‘123454536f667445454d537973576562’;

    key = CryptoJS.enc.Utf8.parse(key);

    var iv = “1234577290ABCDEF1264147890ACAE45”;

    iv = CryptoJS.enc.Utf8.parse(iv);

    var encrypted = CryptoJS.AES.encrypt(text, key, {

        iv: iv,

        mode: CryptoJS.mode.CBC,

        padding: CryptoJS.pad.ZeroPadding

    }).toString()

    document.write(encrypted);

    /script

/body

/html

後端

public function encrypt2($input = ”){

        $pk = “123454536f667445454d537973576562”;

        $iv = substr(“1234577290ABCDEF1264147890ACAE45”, 0, 16);

        // $t = ‘T10515’;

        $encrypted = ( mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $pk, $input, MCRYPT_MODE_CBC,$iv) );

        return base64_encode($encrypted);

    } 

    public function decrypt2($encrypted){

        $pk = “123454536f667445454d537973576562”;

        $iv = substr(“1234577290ABCDEF1264147890ACAE45”, 0, 16);

        // $t = ‘T10515’;

        // $encrypted = “b7y/JPJFNTfxNVR8H4NNtw==”;

        return  mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $pk, base64_decode($encrypted), MCRYPT_MODE_CBC, $iv);

    }

可以推斷， js 部分實際只使用了 iv 的 16 位長度

ps：

js加密後默認會base64_encode

使用php解密需要base64_decode後才一致

所以使用js加密和php解密時候需要注意，php端要先base64_decode再解密，例：

js加密的串是$t=b7y/JPJFNTfxNVR8H4NNtw==

php需要

$password= trim(mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $pk,base64_decode( $t), MCRYPT_MODE_CBC, $iv));

則$password才能正確解析出來

需要引入的兩個js文件

ase.js

[javascript] view plain copy

/*

CryptoJS v3.1.2

code.google.com/p/crypto-js

(c) 2009-2013 by Jeff Mott. All rights reserved.

code.google.com/p/crypto-js/wiki/License

*/

var CryptoJS=CryptoJS||function(u,p){var d={},l=d.lib={},s=function(){},t=l.Base={extend:function(a){s.prototype=this;var c=new s;ac.mixIn(a);c.hasOwnProperty(“init”)||(c.init=function(){c.$super.init.apply(this,arguments)});c.init.prototype=c;c.$super=this;return c},create:function(){var a=this.extend();a.init.apply(a,arguments);return a},init:function(){},mixIn:function(a){for(var c in a)a.hasOwnProperty(c)(this[c]=a[c]);a.hasOwnProperty(“toString”)(this.toString=a.toString)},clone:function(){return this.init.prototype.extend(this)}},

r=l.WordArray=t.extend({init:function(a,c){a=this.words=a||[];this.sigBytes=c!=p?c:4*a.length},toString:function(a){return(a||v).stringify(this)},concat:function(a){var c=this.words,e=a.words,j=this.sigBytes;a=a.sigBytes;this.clamp();if(j%4)for(var k=0;ka;k++)c[j+k2]|=(e[k2]24-8*(k%4)255)24-8*((j+k)%4);else if(65535e.length)for(k=0;ka;k+=4)c[j+k2]=e[k2];else c.push.apply(c,e);this.sigBytes+=a;return this},clamp:function(){var a=this.words,c=this.sigBytes;a[c2]=4294967295

32-8*(c%4);a.length=u.ceil(c/4)},clone:function(){var a=t.clone.call(this);a.words=this.words.slice(0);return a},random:function(a){for(var c=[],e=0;ea;e+=4)c.push(4294967296*u.random()|0);return new r.init(c,a)}}),w=d.enc={},v=w.Hex={stringify:function(a){var c=a.words;a=a.sigBytes;for(var e=[],j=0;ja;j++){var k=c[j2]24-8*(j%4)255;e.push((k4).toString(16));e.push((k15).toString(16))}return e.join(“”)},parse:function(a){for(var c=a.length,e=[],j=0;jc;j+=2)e[j3]|=parseInt(a.substr(j,

2),16)24-4*(j%8);return new r.init(e,c/2)}},b=w.Latin1={stringify:function(a){var c=a.words;a=a.sigBytes;for(var e=[],j=0;ja;j++)e.push(String.fromCharCode(c[j2]24-8*(j%4)255));return e.join(“”)},parse:function(a){for(var c=a.length,e=[],j=0;jc;j++)e[j2]|=(a.charCodeAt(j)255)24-8*(j%4);return new r.init(e,c)}},x=w.Utf8={stringify:function(a){try{return decodeURIComponent(escape(b.stringify(a)))}catch(c){throw Error(“Malformed UTF-8 data”);}},parse:function(a){return b.parse(unescape(encodeURIComponent(a)))}},

q=l.BufferedBlockAlgorithm=t.extend({reset:function(){this._data=new r.init;this._nDataBytes=0},_append:function(a){“string”==typeof a(a=x.parse(a));this._data.concat(a);this._nDataBytes+=a.sigBytes},_process:function(a){var c=this._data,e=c.words,j=c.sigBytes,k=this.blockSize,b=j/(4*k),b=a?u.ceil(b):u.max((b|0)-this._minBufferSize,0);a=b*k;j=u.min(4*a,j);if(a){for(var q=0;qa;q+=k)this._doProcessBlock(e,q);q=e.splice(0,a);c.sigBytes-=j}return new r.init(q,j)},clone:function(){var a=t.clone.call(this);

a._data=this._data.clone();return a},_minBufferSize:0});l.Hasher=q.extend({cfg:t.extend(),init:function(a){this.cfg=this.cfg.extend(a);this.reset()},reset:function(){q.reset.call(this);this._doReset()},update:function(a){this._append(a);this._process();return this},finalize:function(a){athis._append(a);return this._doFinalize()},blockSize:16,_createHelper:function(a){return function(b,e){return(new a.init(e)).finalize(b)}},_createHmacHelper:function(a){return function(b,e){return(new n.HMAC.init(a,

e)).finalize(b)}}});var n=d.algo={};return d}(Math);

(function(){var u=CryptoJS,p=u.lib.WordArray;u.enc.Base64={stringify:function(d){var l=d.words,p=d.sigBytes,t=this._map;d.clamp();d=[];for(var r=0;rp;r+=3)for(var w=(l[r2]24-8*(r%4)255)16|(l[r+12]24-8*((r+1)%4)255)8|l[r+22]24-8*((r+2)%4)255,v=0;4vr+0.75*vp;v++)d.push(t.charAt(w6*(3-v)63));if(l=t.charAt(64))for(;d.length%4;)d.push(l);return d.join(“”)},parse:function(d){var l=d.length,s=this._map,t=s.charAt(64);t(t=d.indexOf(t),-1!=t(l=t));for(var t=[],r=0,w=0;w

l;w++)if(w%4){var v=s.indexOf(d.charAt(w-1))2*(w%4),b=s.indexOf(d.charAt(w))6-2*(w%4);t[r2]|=(v|b)24-8*(r%4);r++}return p.create(t,r)},_map:”ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=”}})();

(function(u){function p(b,n,a,c,e,j,k){b=b+(na|~nc)+e+k;return(bj|b32-j)+n}function d(b,n,a,c,e,j,k){b=b+(nc|a~c)+e+k;return(bj|b32-j)+n}function l(b,n,a,c,e,j,k){b=b+(n^a^c)+e+k;return(bj|b32-j)+n}function s(b,n,a,c,e,j,k){b=b+(a^(n|~c))+e+k;return(bj|b32-j)+n}for(var t=CryptoJS,r=t.lib,w=r.WordArray,v=r.Hasher,r=t.algo,b=[],x=0;64x;x++)b[x]=4294967296*u.abs(u.sin(x+1))|0;r=r.MD5=v.extend({_doReset:function(){this._hash=new w.init([1732584193,4023233417,2562383102,271733878])},

_doProcessBlock:function(q,n){for(var a=0;16a;a++){var c=n+a,e=q[c];q[c]=(e8|e24)16711935|(e24|e8)4278255360}var a=this._hash.words,c=q[n+0],e=q[n+1],j=q[n+2],k=q[n+3],z=q[n+4],r=q[n+5],t=q[n+6],w=q[n+7],v=q[n+8],A=q[n+9],B=q[n+10],C=q[n+11],u=q[n+12],D=q[n+13],E=q[n+14],x=q[n+15],f=a[0],m=a[1],g=a[2],h=a[3],f=p(f,m,g,h,c,7,b[0]),h=p(h,f,m,g,e,12,b[1]),g=p(g,h,f,m,j,17,b[2]),m=p(m,g,h,f,k,22,b[3]),f=p(f,m,g,h,z,7,b[4]),h=p(h,f,m,g,r,12,b[5]),g=p(g,h,f,m,t,17,b[6]),m=p(m,g,h,f,w,22,b[7]),

f=p(f,m,g,h,v,7,b[8]),h=p(h,f,m,g,A,12,b[9]),g=p(g,h,f,m,B,17,b[10]),m=p(m,g,h,f,C,22,b[11]),f=p(f,m,g,h,u,7,b[12]),h=p(h,f,m,g,D,12,b[13]),g=p(g,h,f,m,E,17,b[14]),m=p(m,g,h,f,x,22,b[15]),f=d(f,m,g,h,e,5,b[16]),h=d(h,f,m,g,t,9,b[17]),g=d(g,h,f,m,C,14,b[18]),m=d(m,g,h,f,c,20,b[19]),f=d(f,m,g,h,r,5,b[20]),h=d(h,f,m,g,B,9,b[21]),g=d(g,h,f,m,x,14,b[22]),m=d(m,g,h,f,z,20,b[23]),f=d(f,m,g,h,A,5,b[24]),h=d(h,f,m,g,E,9,b[25]),g=d(g,h,f,m,k,14,b[26]),m=d(m,g,h,f,v,20,b[27]),f=d(f,m,g,h,D,5,b[28]),h=d(h,f,

m,g,j,9,b[29]),g=d(g,h,f,m,w,14,b[30]),m=d(m,g,h,f,u,20,b[31]),f=l(f,m,g,h,r,4,b[32]),h=l(h,f,m,g,v,11,b[33]),g=l(g,h,f,m,C,16,b[34]),m=l(m,g,h,f,E,23,b[35]),f=l(f,m,g,h,e,4,b[36]),h=l(h,f,m,g,z,11,b[37]),g=l(g,h,f,m,w,16,b[38]),m=l(m,g,h,f,B,23,b[39]),f=l(f,m,g,h,D,4,b[40]),h=l(h,f,m,g,c,11,b[41]),g=l(g,h,f,m,k,16,b[42]),m=l(m,g,h,f,t,23,b[43]),f=l(f,m,g,h,A,4,b[44]),h=l(h,f,m,g,u,11,b[45]),g=l(g,h,f,m,x,16,b[46]),m=l(m,g,h,f,j,23,b[47]),f=s(f,m,g,h,c,6,b[48]),h=s(h,f,m,g,w,10,b[49]),g=s(g,h,f,m,

E,15,b[50]),m=s(m,g,h,f,r,21,b[51]),f=s(f,m,g,h,u,6,b[52]),h=s(h,f,m,g,k,10,b[53]),g=s(g,h,f,m,B,15,b[54]),m=s(m,g,h,f,e,21,b[55]),f=s(f,m,g,h,v,6,b[56]),h=s(h,f,m,g,x,10,b[57]),g=s(g,h,f,m,t,15,b[58]),m=s(m,g,h,f,D,21,b[59]),f=s(f,m,g,h,z,6,b[60]),h=s(h,f,m,g,C,10,b[61]),g=s(g,h,f,m,j,15,b[62]),m=s(m,g,h,f,A,21,b[63]);a[0]=a[0]+f|0;a[1]=a[1]+m|0;a[2]=a[2]+g|0;a[3]=a[3]+h|0},_doFinalize:function(){var b=this._data,n=b.words,a=8*this._nDataBytes,c=8*b.sigBytes;n[c5]|=12824-c%32;var e=u.floor(a/

4294967296);n[(c+6494)+15]=(e8|e24)16711935|(e24|e8)4278255360;n[(c+6494)+14]=(a8|a24)16711935|(a24|a8)4278255360;b.sigBytes=4*(n.length+1);this._process();b=this._hash;n=b.words;for(a=0;4a;a++)c=n[a],n[a]=(c8|c24)16711935|(c24|c8)4278255360;return b},clone:function(){var b=v.clone.call(this);b._hash=this._hash.clone();return b}});t.MD5=v._createHelper(r);t.HmacMD5=v._createHmacHelper(r)})(Math);

(function(){var u=CryptoJS,p=u.lib,d=p.Base,l=p.WordArray,p=u.algo,s=p.EvpKDF=d.extend({cfg:d.extend({keySize:4,hasher:p.MD5,iterations:1}),init:function(d){this.cfg=this.cfg.extend(d)},compute:function(d,r){for(var p=this.cfg,s=p.hasher.create(),b=l.create(),u=b.words,q=p.keySize,p=p.iterations;u.lengthq;){ns.update(n);var n=s.update(d).finalize(r);s.reset();for(var a=1;ap;a++)n=s.finalize(n),s.reset();b.concat(n)}b.sigBytes=4*q;return b}});u.EvpKDF=function(d,l,p){return s.create(p).compute(d,

l)}})();

CryptoJS.lib.Cipher||function(u){var p=CryptoJS,d=p.lib,l=d.Base,s=d.WordArray,t=d.BufferedBlockAlgorithm,r=p.enc.Base64,w=p.algo.EvpKDF,v=d.Cipher=t.extend({cfg:l.extend(),createEncryptor:function(e,a){return this.create(this._ENC_XFORM_MODE,e,a)},createDecryptor:function(e,a){return this.create(this._DEC_XFORM_MODE,e,a)},init:function(e,a,b){this.cfg=this.cfg.extend(b);this._xformMode=e;this._key=a;this.reset()},reset:function(){t.reset.call(this);this._doReset()},process:function(e){this._append(e);return this._process()},

finalize:function(e){ethis._append(e);return this._doFinalize()},keySize:4,ivSize:4,_ENC_XFORM_MODE:1,_DEC_XFORM_MODE:2,_createHelper:function(e){return{encrypt:function(b,k,d){return(“string”==typeof k?c:a).encrypt(e,b,k,d)},decrypt:function(b,k,d){return(“string”==typeof k?c:a).decrypt(e,b,k,d)}}}});d.StreamCipher=v.extend({_doFinalize:function(){return this._process(!0)},blockSize:1});var b=p.mode={},x=function(e,a,b){var c=this._iv;c?this._iv=u:c=this._prevBlock;for(var d=0;db;d++)e[a+d]^=

c[d]},q=(d.BlockCipherMode=l.extend({createEncryptor:function(e,a){return this.Encryptor.create(e,a)},createDecryptor:function(e,a){return this.Decryptor.create(e,a)},init:function(e,a){this._cipher=e;this._iv=a}})).extend();q.Encryptor=q.extend({processBlock:function(e,a){var b=this._cipher,c=b.blockSize;x.call(this,e,a,c);b.encryptBlock(e,a);this._prevBlock=e.slice(a,a+c)}});q.Decryptor=q.extend({processBlock:function(e,a){var b=this._cipher,c=b.blockSize,d=e.slice(a,a+c);b.decryptBlock(e,a);x.call(this,

e,a,c);this._prevBlock=d}});b=b.CBC=q;q=(p.pad={}).Pkcs7={pad:function(a,b){for(var c=4*b,c=c-a.sigBytes%c,d=c24|c16|c8|c,l=[],n=0;nc;n+=4)l.push(d);c=s.create(l,c);a.concat(c)},unpad:function(a){a.sigBytes-=a.words[a.sigBytes-12]255}};d.BlockCipher=v.extend({cfg:v.cfg.extend({mode:b,padding:q}),reset:function(){v.reset.call(this);var a=this.cfg,b=a.iv,a=a.mode;if(this._xformMode==this._ENC_XFORM_MODE)var c=a.createEncryptor;else c=a.createDecryptor,this._minBufferSize=1;this._mode=c.call(a,

this,bb.words)},_doProcessBlock:function(a,b){this._mode.processBlock(a,b)},_doFinalize:function(){var a=this.cfg.padding;if(this._xformMode==this._ENC_XFORM_MODE){a.pad(this._data,this.blockSize);var b=this._process(!0)}else b=this._process(!0),a.unpad(b);return b},blockSize:4});var n=d.CipherParams=l.extend({init:function(a){this.mixIn(a)},toString:function(a){return(a||this.formatter).stringify(this)}}),b=(p.format={}).OpenSSL={stringify:function(a){var b=a.ciphertext;a=a.salt;return(a?s.create([1398893684,

1701076831]).concat(a).concat(b):b).toString(r)},parse:function(a){a=r.parse(a);var b=a.words;if(1398893684==b[0]1701076831==b[1]){var c=s.create(b.slice(2,4));b.splice(0,4);a.sigBytes-=16}return n.create({ciphertext:a,salt:c})}},a=d.SerializableCipher=l.extend({cfg:l.extend({format:b}),encrypt:function(a,b,c,d){d=this.cfg.extend(d);var l=a.createEncryptor(c,d);b=l.finalize(b);l=l.cfg;return n.create({ciphertext:b,key:c,iv:l.iv,algorithm:a,mode:l.mode,padding:l.padding,blockSize:a.blockSize,formatter:d.format})},

decrypt:function(a,b,c,d){d=this.cfg.extend(d);b=this._parse(b,d.format);return a.createDecryptor(c,d).finalize(b.ciphertext)},_parse:function(a,b){return”string”==typeof a?b.parse(a,this):a}}),p=(p.kdf={}).OpenSSL={execute:function(a,b,c,d){d||(d=s.random(8));a=w.create({keySize:b+c}).compute(a,d);c=s.create(a.words.slice(b),4*c);a.sigBytes=4*b;return n.create({key:a,iv:c,salt:d})}},c=d.PasswordBasedCipher=a.extend({cfg:a.cfg.extend({kdf:p}),encrypt:function(b,c,d,l){l=this.cfg.extend(l);d=l.kdf.execute(d,

b.keySize,b.ivSize);l.iv=d.iv;b=a.encrypt.call(this,b,c,d.key,l);b.mixIn(d);return b},decrypt:function(b,c,d,l){l=this.cfg.extend(l);c=this._parse(c,l.format);d=l.kdf.execute(d,b.keySize,b.ivSize,c.salt);l.iv=d.iv;return a.decrypt.call(this,b,c,d.key,l)}})}();

(function(){for(var u=CryptoJS,p=u.lib.BlockCipher,d=u.algo,l=[],s=[],t=[],r=[],w=[],v=[],b=[],x=[],q=[],n=[],a=[],c=0;256c;c++)a[c]=128c?c1:c1^283;for(var e=0,j=0,c=0;256c;c++){var k=j^j1^j2^j3^j4,k=k8^k255^99;l[e]=k;s[k]=e;var z=a[e],F=a[z],G=a[F],y=257*a[k]^16843008*k;t[e]=y24|y8;r[e]=y16|y16;w[e]=y8|y24;v[e]=y;y=16843009*G^65537*F^257*z^16843008*e;b[k]=y24|y8;x[k]=y16|y16;q[k]=y8|y24;n[k]=y;e?(e=z^a[a[a[G^z]]],j^=a[a[j]]):e=j=1}var H=[0,1,2,4,8,

16,32,64,128,27,54],d=d.AES=p.extend({_doReset:function(){for(var a=this._key,c=a.words,d=a.sigBytes/4,a=4*((this._nRounds=d+6)+1),e=this._keySchedule=[],j=0;ja;j++)if(jd)e[j]=c[j];else{var k=e[j-1];j%d?6d4==j%d(k=l[k24]24|l[k16255]16|l[k8255]8|l[k255]):(k=k8|k24,k=l[k24]24|l[k16255]16|l[k8255]8|l[k255],k^=H[j/d|0]24);e[j]=e[j-d]^k}c=this._invKeySchedule=[];for(d=0;da;d++)j=a-d,k=d%4?e[j]:e[j-4],c[d]=4d||4=j?k:b[l[k24]]^x[l[k16255]]^q[l[k

8255]]^n[l[k255]]},encryptBlock:function(a,b){this._doCryptBlock(a,b,this._keySchedule,t,r,w,v,l)},decryptBlock:function(a,c){var d=a[c+1];a[c+1]=a[c+3];a[c+3]=d;this._doCryptBlock(a,c,this._invKeySchedule,b,x,q,n,s);d=a[c+1];a[c+1]=a[c+3];a[c+3]=d},_doCryptBlock:function(a,b,c,d,e,j,l,f){for(var m=this._nRounds,g=a[b]^c[0],h=a[b+1]^c[1],k=a[b+2]^c[2],n=a[b+3]^c[3],p=4,r=1;rm;r++)var q=d[g24]^e[h16255]^j[k8255]^l[n255]^c[p++],s=d[h24]^e[k16255]^j[n8255]^l[g255]^c[p++],t=

d[k24]^e[n16255]^j[g8255]^l[h255]^c[p++],n=d[n24]^e[g16255]^j[h8255]^l[k255]^c[p++],g=q,h=s,k=t;q=(f[g24]24|f[h16255]16|f[k8255]8|f[n255])^c[p++];s=(f[h24]24|f[k16255]16|f[n8255]8|f[g255])^c[p++];t=(f[k24]24|f[n16255]16|f[g8255]8|f[h255])^c[p++];n=(f[n24]24|f[g16255]16|f[h8255]8|f[k255])^c[p++];a[b]=q;a[b+1]=s;a[b+2]=t;a[b+3]=n},keySize:8});u.AES=p._createHelper(d)})();

pad-zeropadding.js

/*

CryptoJS v3.1.2

code.google.com/p/crypto-js

(c) 2009-2013 by Jeff Mott. All rights reserved.

code.google.com/p/crypto-js/wiki/License

*/

/**

* Zero padding strategy.

*/

CryptoJS.pad.ZeroPadding = {

    pad: function (data, blockSize) {

        // Shortcut

        var blockSizeBytes = blockSize * 4; 

        // Pad

        data.clamp();

        data.sigBytes += blockSizeBytes – ((data.sigBytes % blockSizeBytes) || blockSizeBytes);

    }, 

    unpad: function (data) {

        // Shortcut

        var dataWords = data.words; 

        // Unpad

        var i = data.sigBytes – 1;

        while (!((dataWords[i 2] (24 – (i % 4) * 8)) 0xff)) {

            i–;

        }

        data.sigBytes = i + 1;

    }

}; 

為什麼 CryptoJS DES 加密的結果和 Java DES 不一樣

最近需要對數據進行加密/解密, 因此選用了CryptoJS庫, 對數據做DES演算法的加密/解密

首選查看官方示例, 將密文進行Base64編碼, 掉進一個大坑

script src=”htt p:/ /crypto-js.googlecod e.c om/svn/tags/3.1.2/build/rollups/tripledes.js”/script

script

var encrypted = CryptoJS.DES.encrypt(“Message”, “Secret Passphrase”);

// ciphertext changed every time you run it

// 加密的結果不應該每次都是一樣的嗎?

console.log(encrypted.toString(), encrypted.ciphertext.toString(CryptoJS.enc.Base64));

var decrypted = CryptoJS.DES.decrypt(encrypted, “Secret Passphrase”);

console.log(decrypted.toString(CryptoJS.enc.Utf8));

/script

對這些加密演算法不了解, 只能求助Google

des encrypion: js encrypted value does not match the java encrypted value

In cryptoJS you have to convert the key to hex and useit as word just like above (otherwise it will be considered as passphrase)

For the key, when you pass a string, it’s treated as a passphrase and used to derive an actual key and IV. Or you can pass a WordArray that represents the actual key.

原來是我指定key的方式不對, 直接將字元串做為參數, 想當然的以為這就是key, 其實不然, CryptoJS會根據這個字元串算出真正的key和IV(各種新鮮名詞不解釋, 問我也沒用, 我也不懂 -_-“)

那麼我們只需要將key和iv對應的字元串轉成CryptoJS的WordArray類型, 在DES加密時做為參數傳入即可, 這樣對Message這個字元串加密, 每次得到的密文都是YOa3le0I+dI=

var keyHex = CryptoJS.enc.Utf8.parse(‘abcd1234’);

var ivHex = CryptoJS.enc.Utf8.parse(‘inputvec’);

var encrypted = CryptoJS.DES.encrypt(‘Message’, keyHex, { iv: ivHex });

這樣是不是就萬事OK了? 哪有, 誰知道這坑是一個接一個啊.

我們再試試Java這邊的DES加密是不是和這個結果一樣, 具體實現請參考Simple Java Class to DES Encrypt Strings

果真掉坑裡了, Java通過DES加密Message這個字元串得到的結果是8dKft9vkZ4I=和CryptoJS算出來的不一樣啊…親

繼續求助Google

C# and Java DES Encryption value are not identical

SunJCE provider uses ECB as the default mode, and PKCS5Padding as the default padding scheme for DES.(JCA Doc)

This means that in the case of the SunJCE provider,

Cipher c1 = Cipher.getInstance(“DES/ECB/PKCS5Padding”);

and

Cipher c1 = Cipher.getInstance(“DES”);

are equivalent statements.

原來是CryptoJS進行DES加密時, 默認的模式和padding方式和Java默認的不一樣造成的, 必須使用ECB mode和PKCS5Padding, 但是CryptoJS中只有Pkcs7, 不管了, 試試看…

script src=”htt p:/ /crypto-js.googleco de.c om/svn/tags/3.1.2/build/rollups/tripledes.js”/script

script src=”ht tp:/ /crypto-js.googleco de.c om/svn/tags/3.1.2/build/components/mode-ecb.js”/script

script

var keyHex = CryptoJS.enc.Utf8.parse(‘abcd1234’);

var encrypted = CryptoJS.DES.encrypt(‘Message’, keyHex, {

mode: CryptoJS.mode.ECB,

padding: CryptoJS.pad.Pkcs7

});

console.log(encrypted.toString(), encrypted.ciphertext.toString(CryptoJS.enc.Base64));

/script

咦…使用Pkcs7能得到和Java DES一樣的結果了, 哇塞…好神奇

那我們試試統一Java也改成Cipher.getInstance(“DES/ECB/PKCS7Padding”)試試, 結果得到一個大大的錯誤

Error:java.security.NoSuchAlgorithmException: Cannot find any provider supporting DES/ECB/PKCS7Padding

沒辦法, 繼續Google

java.security.NoSuchAlgorithmException: Cannot find any provider supporting AES/ECB/PKCS7PADDING

I will point out that PKCS#5 and PKCS#7 actually specify exactly the same type of padding (they are the same!), but it’s called #5 when used in this context. :)

這位大俠給出的解釋是: PKCS#5和PKCS#7是一樣的padding方式, 對加密演算法一知半解, 我也只能暫且認可這個解釋了.

忙完了DES的加密, 接下來就是使用CryptoJS來解密了. 我們需要直接解密DES加密後的base64密文字元串. CryptoJS好像沒有提供直接解密DES密文字元串的方法啊, 他的整個加密/解密過程都是內部自己在玩, 解密時需要用到加密的結果對象, 這不是坑我嗎?

只好研究下CryptoJS DES加密後返回的對象, 發現有一個屬性ciphertext, 就是密文的WordArray, 那麼解密的時候, 我們是不是只要提供這個就行了呢?

var keyHex = CryptoJS.enc.Utf8.parse(‘abcd1234’);

// direct decrypt ciphertext

var decrypted = CryptoJS.DES.decrypt({

ciphertext: CryptoJS.enc.Base64.parse(‘8dKft9vkZ4I=’)

}, keyHex, {

mode: CryptoJS.mode.ECB,

padding: CryptoJS.pad.Pkcs7

});

console.log(decrypted.toString(CryptoJS.enc.Utf8));

果不其然, 到此為止, 問題全部解決, 豁然開朗…

完整代碼請參考CryptoJS-DES.html

Use CryptoJS encrypt message by DES and direct decrypt ciphertext, compatible with Java Cipher.getInstance(“DES”)