PHP加密与数据保护的实际应用案例分享

<?php
// 加密数据
function encrypt($data, $key) {
  $encrypted = openssl_encrypt($data, 'AES-256-CBC', $key, OPENSSL_RAW_DATA, $iv);
  return base64_encode($encrypted);
}

// 解密数据
function decrypt($encryptedData, $key) {
  $encryptedData = base64_decode($encryptedData);
  return openssl_decrypt($encryptedData, 'AES-256-CBC', $key, OPENSSL_RAW_DATA, $iv);
}

$key = 'mySecretKey';
$data = 'Hello, World!';

$encryptedData = encrypt($data, $key);
echo "加密后的数据：".$encryptedData."
";

$decryptedData = decrypt($encryptedData, $key);
echo "解密后的数据：".$decryptedData."
";
?>

<?php
// 密码加密
function encryptPassword($password) {
  $hashedPassword = password_hash($password, PASSWORD_BCRYPT);
  return $hashedPassword;
}

// 密码验证
function verifyPassword($password, $hashedPassword) {
  return password_verify($password, $hashedPassword);
}

$password = 'myPassword';
$hashedPassword = encryptPassword($password);
echo "加密后的密码：".$hashedPassword."
";

if (verifyPassword($password, $hashedPassword)) {
  echo "密码验证通过！
";
} else {
  echo "密码验证失败！
";
}
?>

<?php
$db = new PDO("mysql:host=localhost;dbname=mydatabase", "username", "password");

// 使用预处理语句插入数据
$stmt = $db->prepare("INSERT INTO users (username, password) VALUES (:username, :password)");
$username = $_POST['username'];
$password = $_POST['password'];
$stmt->bindParam(':username', $username);
$stmt->bindParam(':password', $password);
$stmt->execute();

// 使用预处理语句查询数据
$stmt = $db->prepare("SELECT * FROM users WHERE username = :username");
$username = $_POST['username'];
$stmt->bindParam(':username', $username);
$stmt->execute();
$user = $stmt->fetch();

echo "欢迎回来，".$user['username']."！";
?>