RSA实现JS前端加密,PHP后端解密

web前端,用户注册与登录,不能直接以明文形式提交用户密码,容易被截获,这时就引入RSA。 

前端加密

    需引入4个JS扩展文件,jsbn.js、prng4.js、rng.js和rsa.js。 

    

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<html>
<head>
    <title>RSA Login Testtitle>
    <meta charset="utf-8">
    <script type="text/javascript" src="./js/jsbn.js">script>
    <script type="text/javascript" src="./js/prng4.js">script>
    <script type="text/javascript" src="./js/rng.js">script>
    <script type="text/javascript" src="./js/rsa.js">script>
    <script src="//cdn.bootcss.com/jquery/3.0.0/jquery.min.js">script>

    <script type="text/javascript">
        function cmdEncrypt() {
            var passwd = $('#passwd').val();
            var rsa = new RSAKey();

       //openssl生成的modulus,十六进制数据
var modulus = "DB1EA572B55F5D9C8ADF092F5DCC3559CFEA8CE8BB54E3A71DA9B1AFBD7D17CF80ADB224FE4EA5379BC782F41C137748D8F1B5A36AD62A127EF5E87EFB25C209A66BCEE9925CE09631BF2271E81123E93438646625080FF04F4F2CF532B077E3E390486DF40E7586F0AE522C873F33170222F46BDB6084F55DE6B7031E55DBE7";
//openssl生成秘钥时的e的值(0x10001)
       
var exponent = "10001"; rsa.setPublic(modulus, exponent);
var res = rsa.encrypt(passwd); $('#passwd').val(res); } script> head> <body> <form action="./login.php" method="post" > <label for="username">用户名:label><input type="text" name="username" id="username"> <label for="passwd">密 码:label><input type="password" name="password" id="passwd"> <input type="submit" value="登录" onclick="cmdEncrypt();"> form> body> html>
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  前端代码十分简单,只有短短的几行,下面分别解释具体的含义:
    1.new一个RSAKey对象,
    2.定义modulus(模数),我们可以根据私钥计算出该值(十六进制),具体指令: rsa -in rsa_private_key.pem -noout -modulus  
    3.定义exponent,此值在openssl生成秘钥时,输出,一般情况下e的取值是一个定值10001(十六进制)
    4.设置公钥
    5.加密数据

    至此,我们就完成了前端的公钥加密。

  

后端解密

     

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//私钥
$private_key = "-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----";

$hex_encrypt_data = trim($_POST['password']);  //十六进制数据
$encrypt_data = pack("H*", $hex_encrypt_data); //对十六进制数据进行转换
openssl_private_decrypt($encrypt_data, $decrypt_data, $private_key); //解密数据

echo '解密后的数据:' . $decrypt_data;
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 openssl操作截图:

RSA实现JS前端加密,PHP后端解密_第1张图片

需要注意的是:前端加密的时候如果是中文,则解密后是乱码。

openssl工具和完整demo,详见:https://github.com/cqingt/RSA_JS_PHP

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