用 CryptoJS 加密，用 PHP 解密

Question

在客户端（移动设备）我使用 CryptoJS 加密用户密码：

var lib_crypt = require('aes');

$.loginButton.addEventListener('click', function(e){

var key = lib_crypt.CryptoJS.enc.Hex.parse('bcb04b7e103a0cd8b54763051cef08bc55abe029fdebae5e1d417e2ffb2a00a3');
var iv  = lib_crypt.CryptoJS.enc.Hex.parse('101112131415161718191a1b1c1d1e1f');

var encrypted = lib_crypt.CryptoJS.AES.encrypt($.passwordInput.value, key, { iv: iv });

var password_base64 = encrypted.ciphertext.toString(lib_crypt.CryptoJS.enc.Base64); 
return password_base64; 
});

在服务器端我想用 mcrypt_decrypt 解密它：

function decryptPassword($password)
{
    $key = pack('H*', "bcb04b7e103a0cd8b54763051cef08bc55abe029fdebae5e1d417e2ffb2a00a3");
    $ciphertext_dec = base64_decode($password);
    $iv_dec = "101112131415161718191a1b1c1d1e1f";

    $ciphertext_dec = substr($ciphertext_dec, 16);
    $decryptedPassword = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $ciphertext_dec, MCRYPT_MODE_CBC, $iv_dec);

    return trim($decryptedPassword);
}

我使用相同的密钥和IV，我做错了什么？

Answer 1

双方做的事情不一样。

IV

您确实在 CryptoJS 中解析了 IV，但忘记在 PHP 中解析：

$iv_dec = pack('H*', "101112131415161718191a1b1c1d1e1f");

要解决您的 IV 错误，您可能注意到前 16 个字节是乱码。当 IV 错误时，就会发生这种情况。请注意，CryptoJS 默认使用 CBC 模式，因此 IV 在解密过程中仅对第一个块有影响。 删除这个：

$ciphertext_dec = substr($ciphertext_dec, 16);

填充

您可能注意到大多数纯文本的输出都不正确。它们以一些奇怪的重复字符结尾。这是 CryptoJS 中默认应用的 PKCS#7 填充。您必须自己在 PHP 中删除填充。好消息是 Maarten Bodewes 为这个 here 提供了适当的复制粘贴解决方案。

trim() 可能适用于 ZeroPadding，但不适用于使用 PKCS#7 中定义的适当填充方案时。您可以完全删除 trim() 调用，因为它没有用，并且可能导致意外的纯文本，因为零字节和空白从开头和结尾被修剪。

Answer 2

你好，

为了实现这一点，应该考虑使用 key 和 iv 每个 32 个十六进制数字，我必须通过自己的工作来解决这个问题，这就是它的方式

<!--
This reach.your.crypto.js is just a ficticious placeholder, 
that was used replaced by http://crypto-js.googlecode.com/svn/tags/3.1.2/build/,
which does not exist anymore,
which is the path to your CryptoJS library,
that can be downloaded through 
https://code.google.com/archive/p/crypto-js/downloads?page=1
-->
<script src="reach.your.crypto.js/rollups/aes.js">
</script>

<script type="text/javascript">
//The key and iv should be 32 hex digits each, any hex digits you want, 
//but it needs to be 32 on length each
var key = CryptoJS.enc.Hex.parse("0123456789abcdef0123456789abcdef");
var iv =  CryptoJS.enc.Hex.parse("abcdef9876543210abcdef9876543210");

/*
if you wish to have a more friendly key, you can convert letters to Hex this way:
var a = "D";
var hex_D = a.charCodeAt(0).toString(16);
just to mention,
if it were to binary, it would be:
var binary_D = a.charCodeAt(0).toString(2);
*/

var secret = "Hi, this will be seen uncrypted later on";

//crypted
var encrypted = CryptoJS.AES.encrypt(secret, key, {iv:iv});
//and the ciphertext put to base64
encrypted = encrypted.ciphertext.toString(CryptoJS.enc.Base64);    
//Assuming you have control on the server side, and know the key and iv hexes(we do),
//the encrypted var is all you need to pass through ajax,
//Let's follow with welcomed pure JS style, to reinforce one and other concept if needed
var xh = new XMLHttpRequest();
xh.open("POST", "decrypt_in_php.php", true);
xh.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xh.send("encrypted="+encodeURIComponent(encrypted));
</script>

现在在 PHP 中接收和解密

<?php
//Here we have the key and iv which we know, because we have just chosen them on the JS,
//the pack acts just like the parse Hex from JS

$key = pack("H*", "0123456789abcdef0123456789abcdef");
$iv =  pack("H*", "abcdef9876543210abcdef9876543210");

//Now we receive the encrypted from the post, we should decode it from base64,
$encrypted = base64_decode($_POST["encrypted"]);
$shown = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $encrypted, MCRYPT_MODE_CBC, $iv);

echo $shown;
//Although the decrypted is shown, there may be needed to trim and str_replace some \r \n \x06 \x05, if there is not a better "trim" way to do it though
?>

有了这个，我们将返回“嗨，稍后会看到它是未加密的” :)

Answer 3

这是一个基于this comment 的解决方案，使用PHP 中的openssl_decrypt。

JavaScript 部分（使用 NodeJS 开发浏览器）——首先，安装 CryptoJS 和 npm install crypto-js，然后安装您的 JS 代码：

import aes from 'crypto-js/aes'
import encHex from 'crypto-js/enc-hex'
import padZeroPadding from 'crypto-js/pad-zeropadding'

// message to encrypt
let msg = "Hello world";

// the key and iv should be 32 hex digits each, any hex digits you want, but it needs to be 32 on length each
let key = encHex.parse("0123456789abcdef0123456789abcdef");
let iv =  encHex.parse("abcdef9876543210abcdef9876543210");

// encrypt the message
let encrypted = aes.encrypt(msg, key, {iv:iv, padding:padZeroPadding}).toString();

// and finally, send this "encrypted" string to your server

在 PHP 方面，您的代码将如下所示：

// we use the same key and IV
$key = hex2bin("0123456789abcdef0123456789abcdef");
$iv =  hex2bin("abcdef9876543210abcdef9876543210");

// we receive the encrypted string from the post
$encrypted = $_POST['decrypt'];
$decrypted = openssl_decrypt($encrypted, 'AES-128-CBC', $key, OPENSSL_ZERO_PADDING, $iv);
// finally we trim to get our original string
$decrypted = trim($decrypted);