标签： JavaScript

使用 Crypto-JS 可以非常方便地在 JavaScript 进行 MD5、SHA1、SHA2、SHA3、RIPEMD-160 哈希散列，进行 AES、DES、Rabbit、RC4、Triple DES 加解密。

基于 Crypto-JS 实现的在线加密解密工具 —— 在线哈希、在线散列 和 在线加密、在线解密。

下面讲述如何使用 Crypto-JS。

Crypto-JS 源码托管在 Google Code，当前版本是 3.1。因为一般在国内也无法打开，所以把源代码分享到百度盘：http://pan.baidu.com/s/1bnyIGxT。

Crypto-JS 原网址是 https://code.google.com/p/crypto-js/。文中的英文描述均是原作者所有，Crypto-JS 采用的授权协议跟 MIT 类似，可以在任何场景放心使用。

文章最末附上 Crypto-JS 文件目录结构。

使用 Crypto-JS 进行哈希、散列

• md5

引入 md5.js

<script src="cryptojs/rollups/md5.js"></script>

调用 md5 方法

var str = '123456';
CryptoJS.MD5(str);

• pbkdf2

PBKDF2 is a password-based key derivation function. In many applications of cryptography, user security is ultimately dependent on a password, and because a password usually can’t be used directly as a cryptographic key, some processing is required.

A salt provides a large set of keys for any given password, and an iteration count increases the cost of producing keys from a password, thereby also increasing the difficulty of attack.

引入 pbkdf2.js

<script src="cryptojs/rollups/pbkdf2.js"></script>

调用 pbkdf2 方法

// 官方示例
var str = '123456';
var salt = CryptoJS.lib.WordArray.random(128/8);

var key128Bits = CryptoJS.PBKDF2(str, salt, { keySize: 128/32 });
var key256Bits = CryptoJS.PBKDF2(str, salt, { keySize: 256/32 });
var key512Bits = CryptoJS.PBKDF2(str, salt, { keySize: 512/32 });

var key512Bits1000Iterations = CryptoJS.PBKDF2("Secret Passphrase", salt, {
keySize: 512/32,
iterations: 1000
});

• ripemd160

引入 ripemd160.js

<script src="cryptojs/rollups/ripemd160.js"></script>

调用 ripemd160 方法

var str = '123456';
CryptoJS.RIPEMD160(str);

• sha 系列：sha1、sha2、sha3…

sha 具有一系列散列算法

The SHA hash functions were designed by the National Security Agency (NSA). SHA-1 is the most established of the existing SHA hash functions, and it’s used in a variety of security applications and protocols. Though, SHA-1’s collision resistance has been weakening as new attacks are discovered or improved.

SHA-256 is one of the four variants in the SHA-2 set. It isn’t as widely used as SHA-1, though it appears to provide much better security.

SHA-512 is largely identical to SHA-256 but operates on 64-bit words rather than 32.
CryptoJS also supports SHA-224 and SHA-384, which are largely identical but truncated versions of SHA-256 and SHA-512 respectively.

SHA-3 is the winner of a five-year competition to select a new cryptographic hash algorithm where 64 competing designs were evaluated.
SHA-3 can be configured to output hash lengths of one of 224, 256, 384, or 512 bits. The default is 512 bits.

引入 sha 相关 js

<script src="cryptojs/rollups/sha1.js"></script>
<script src="cryptojs/rollups/sha3.js"></script>
<script src="cryptojs/rollups/sha224.js"></script>
<script src="cryptojs/rollups/sha256.js"></script>
<script src="cryptojs/rollups/sha384.js"></script>
<script src="cryptojs/rollups/sha512.js"></script>

调用 sha 相关方法

var str = '123456';
CryptoJS.SHA1(str);

var str = '123456';
CryptoJS.SHA3(str);

// 配置输出的哈希长度
CryptoJS.SHA3(str, {outputLength : 224});
CryptoJS.SHA3(str, {outputLength : 256});
CryptoJS.SHA3(str, {outputLength : 384});
CryptoJS.SHA3(str, {outputLength : 512});

var str = '123456';
CryptoJS.SHA224(str);

var str = '123456';
CryptoJS.SHA256(str);

var str = '123456';
CryptoJS.SHA284(str);

var str = '123456';
CryptoJS.SHA512(str);

• hmac 系列：hmac_md5、hmac_ripemd160、hmac_sha1、hmac_sha3…

引入 hmac 相关 js

<script src="cryptojs/rollups/hmac-sha1.js">
</script>
<script src="cryptojs/rollups/hmac-sha3.js">
</script>
<script src="cryptojs/rollups/hmac-sha224.js">
</script>
<script src="cryptojs/rollups/hmac-sha256.js">
</script>
<script src="cryptojs/rollups/hmac-sha384.js">
</script>
<script src="cryptojs/rollups/hmac-sha512.js">
</script>

调用 hmac 相关 方法

var str = '123456';
var password = 'password';

// Hmac 相关调用前都增加了 Hmac
CryptoJS.HmacMD5(str, password);
CryptoJS.HmacRIPEMD160(str, password);
CryptoJS.HmacSHA1(str, password);
CryptoJS.HmacSHA3(str, password);
CryptoJS.HmacSHA224(str, password);
CryptoJS.HmacSHA256(str, password);
CryptoJS.HmacSHA384(str, password);
CryptoJS.HmacSHA512(str, password);

使用 Crypto-JS 进行加密、解密

Crypto-JS 相关 encrypt 函数会并不直接返回字符串，需要调用返回对象的 toString 方法，或者通过 Crypto-JS 转码才能得到真实的结果。

• AES

引入 aes.js

<script src="cryptojs/rollups/aes.js"></script>

调用 CryptoJS.AES

// 官方示例, 每次输出的密文都不一样
CryptoJS.AES.encrypt("Message", "Secret Passphrase");

// 正确用法

var str = '123456';
// 密钥 16 位
var key = '0123456789abcdef';
// 初始向量 initial vector 16 位
var iv = '0123456789abcdef';
// key 和 iv 可以一致

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

var encrypted = CryptoJS.AES.encrypt(str, key, {
	iv: iv,
	mode: CryptoJS.mode.CBC,
	padding: CryptoJS.pad.Pkcs7
});

// 转换为字符串
encrypted = encrypted.toString();

// mode 支持 CBC、CFB、CTR、ECB、OFB, 默认 CBC
// padding 支持 Pkcs7、AnsiX923、Iso10126
// 、NoPadding、ZeroPadding, 默认 Pkcs7, 即 Pkcs5

var decrypted = CryptoJS.AES.decrypt(encrypted, key, {
	iv: iv,
	mode: CryptoJS.mode.CBC,
	padding: CryptoJS.pad.Pkcs7
});

// 转换为 utf8 字符串
decrypted = CryptoJS.enc.Utf8.stringify(decrypted);

// 引入其他加密模式, 填充模式需要引入对应的 js 文件
/*
cryptojs/components/mode-cfb-min.js
cryptojs/components/mode-ctr-min.js
cryptojs/components/mode-ecb-min.js
cryptojs/components/mode-ofb-min.js
cryptojs/components/pad-ansix923-min.js
cryptojs/components/pad-iso10126-min.js
cryptojs/components/pad-iso97971-min.js
cryptojs/components/pad-nopadding-min.js
*/

• DES、Triple DES

DES、Triple DES 的调用形式与 AES 一致。

引入 triple.js, DES 和 Triple DES 都定义在 tripledes.js

<script src="cryptojs/rollups/tripledes.js"></script>

调用 CryptoJS.DES, CryptoJS.TripleDES

var str = '123456';
var key = '0123456789abcdef';
var iv = '0123456789abcdef';

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

// DES 加密
var encrypted = CryptoJS.DES.encrypt(str, key, {
	iv: iv,
	mode: CryptoJS.mode.CBC,
	padding: CryptoJS.pad.Pkcs7
});

// 转换为字符串
encrypted = encrypted.toString();

// DES 解密
var decrypted = CryptoJS.DES.decrypt(encrypted, key, {
	iv: iv,
	mode: CryptoJS.mode.CBC,
	padding: CryptoJS.pad.Pkcs7
});

// 转换为 utf8 字符串
decrypted = CryptoJS.enc.Utf8.stringify(decrypted);

// Triple DES 加密
var encrypted = CryptoJS.TripleDES.encrypt(str, key, {
	iv: iv,
	mode: CryptoJS.mode.CBC,
	padding: CryptoJS.pad.Pkcs7
});

// 转换为字符串
encrypted = encrypted.toString();

// Triple DES 解密
var decrypted = CryptoJS.TripleDES.decrypt(encrypted, key, {
	iv: iv,
	mode: CryptoJS.mode.CBC,
	padding: CryptoJS.pad.Pkcs7
});

// 转换为 utf8 字符串
decrypted = CryptoJS.enc.Utf8.stringify(decrypted);

• Rabbit、RC4

Rabbit、RC4 调用方式一致，不支持 mode、padding。

引入 rabbit.js

<script src="cryptojs/rollups/rabbit.js"></script>

调用 CryptoJS.Rabbit

var str = '123456';
var key = '0123456789abcdef';
var iv = '0123456789abcdef';

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

var encrypted = CryptoJS.Rabbit.encrypt(str, key, {
	iv: iv
});

// 转换为字符串
encrypted = encrypted.toString();

var decrypted = CryptoJS.Rabbit.decrypt(encrypted, key, {
	iv: iv
});

// 转换为 utf8 字符串
decrypted = CryptoJS.enc.Utf8.stringify(decrypted);

引入 rc4.js

<script src="cryptojs/rollups/rc4.js"></script>

调用 CryptoJS.RC4

var str = '123456';
var key = '0123456789abcdef';
var iv = '0123456789abcdef';

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

var encrypted = CryptoJS.RC4.encrypt(str, key, {
	iv: iv
});

// 转换为字符串
encrypted = encrypted.toString();

var decrypted = CryptoJS.RC4.decrypt(encrypted, key, {
	iv: iv
});

// 转换为 utf8 字符串
decrypted = CryptoJS.enc.Utf8.stringify(decrypted);

Crypto-JS 文件目录结构

• cryptojs
  • components
    • aes.js
    • cipher-core.js
    • core.js
    • enc-base64.js
    • enc-utf16.js
    • evpkdf.js
    • format-hex.js
    • hmac.js
    • lib-typedarrays.js
    • md5.js
    • mode-cfb.js
    • mode-ctr.js
    • mode-ctr-gladman.js
    • mode-ecb.js
    • mode-ofb.js
    • pad-ansix923.js
    • pad-iso10126.js
    • pad-iso97971.js
    • pad-nopadding.js
    • pad-zeropadding.js
    • pbkdf2.js
    • rabbit.js
    • rabbit-legacy.js
    • rc4.js
    • ripemd160.js
    • sha1.js
    • sha3.js
    • sha224.js
    • sha256.js
    • sha384.js
    • sha512.js
    • tripledes.js
    • x64-core.js
  • rollups
    • aes.js
    • hmac-md5.js
    • hmac-ripemd160.js
    • hmac-sha1.js
    • hmac-sha3.js
    • hmac-sha224.js
    • hmac-sha256.js
    • hmac-sha384.js
    • hmac-sha512.js
    • md5.js
    • pbkdf2.js
    • rabbit.js
    • rabbit-legacy.js
    • rc4.js
    • ripemd160.js
    • sha1.js
    • sha3.js
    • sha224.js
    • sha256.js
    • sha384.js
    • sha512.js
    • tripledes.js

cryptojs/components 目录下的所有文件都会对应一个压缩文件，比如 cryptojs/components/aes.js 同时会有一个 cryptojs/components/aes-min.js 文件。

cryptojs/rollups 目录下的所有文件都已经压缩完毕，每个文件都可以单独调用。