如何在php中以加密的形式将表单数据发送到服务器？

<script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.9-1/crypto-js.min.js"></script>
<script>
    // 加密函数
    function encryptData(data, publicKey) {
        var encrypted = CryptoJS.AES.encrypt(data, publicKey);
        return encrypted.toString();
    }

    // 生成RSA密钥对，并将公钥嵌入到表单中的隐藏字段
    function generateKeyPair() {
        var keyPair = CryptoJS.lib.WordArray.random(16).toString();
        var publicKey = /* 使用RSA加密算法生成公钥 */;
        document.getElementById("publicKey").value = publicKey;
    }

    // 表单提交时，将数据加密并发送到服务器
    function submitForm() {
        var data = document.getElementById("data").value;
        var publicKey = document.getElementById("publicKey").value;
        var encryptedData = encryptData(data, publicKey);
        document.getElementById("encryptedData").value = encryptedData;
        document.getElementById("form").submit();
    }
</script>

<form id="form" action="submit.php" method="post">
    <input type="hidden" id="publicKey" name="publicKey">
    <input type="hidden" id="encryptedData" name="encryptedData">
    <input type="text" id="data" name="data">
    <button type="button" onclick="generateKeyPair()">生成密钥对</button>
    <button type="button" onclick="submitForm()">提交</button>
</form>

<?php
    // 加载私钥
    $privateKey = openssl_pkey_get_private(/* 私钥内容 */);

    // 解密数据
    $encryptedData = $_POST['encryptedData'];
    openssl_private_decrypt(base64_decode($encryptedData), $decryptedData, $privateKey);

    // 处理解密后的数据
    // ...

    // 关闭私钥
    openssl_free_key($privateKey);
?>