PHP フォームでデータの暗号化と復号化を処理する方法

<?php
// 引入加密函数库
require_once('encryption_functions.php');
// 设定加密算法和加密密钥
$encryptionAlgorithm = 'AES-256-CBC';
$encryptionKey = 's1mp13k3y';
?>

<?php
function encryptData($data, $encryptionKey, $encryptionAlgorithm) {
    // 生成加密初始向量
    $encryptionIV = openssl_random_pseudo_bytes(openssl_cipher_iv_length($encryptionAlgorithm));
    // 对数据进行加密
    $encryptedData = openssl_encrypt($data, $encryptionAlgorithm, $encryptionKey, 0, $encryptionIV);
    // 拼接加密数据和初始向量
    $encryptedDataWithIV = base64_encode($encryptedData . '::' . $encryptionIV);
    return $encryptedDataWithIV;
}
?>

<?php
// 获取表单提交的数据
$username = $_POST['username'];
$password = $_POST['password'];
// 对密码进行加密
$encryptedPassword = encryptData($password, $encryptionKey, $encryptionAlgorithm);
?>

<?php
function decryptData($encryptedData, $encryptionKey, $encryptionAlgorithm) {
    // 拆分加密数据和初始向量
    $encryptedDataWithIV = base64_decode($encryptedData);
    list($encryptedData, $encryptionIV) = explode('::', $encryptedDataWithIV, 2);
    // 对数据进行解密
    $decryptedData = openssl_decrypt($encryptedData, $encryptionAlgorithm, $encryptionKey, 0, $encryptionIV);
    return $decryptedData;
}
?>

<?php
// 解密密码
$decryptedPassword = decryptData($encryptedPassword, $encryptionKey, $encryptionAlgorithm);
?>