PHP开发中如何处理数据加密和解密

<?php
    // 加密函数
    function encrypt($data, $key) {
        $iv = random_bytes(16);
        $encrypted = openssl_encrypt($data, 'AES-256-CBC', $key, OPENSSL_RAW_DATA, $iv);
        $result = base64_encode($iv . $encrypted);
        return $result;
    }
    
    // 解密函数
    function decrypt($data, $key) {
        $data = base64_decode($data);
        $iv = substr($data, 0, 16);
        $cipherText = substr($data, 16);
        $result = openssl_decrypt($cipherText, 'AES-256-CBC', $key, OPENSSL_RAW_DATA, $iv);
        return $result;
    }
    
    // 测试示例
    $text = "Hello, World!";
    $key = "MySecreTKEy";
    
    $encryptedText = encrypt($text, $key);
    echo "加密后的数据：" . $encryptedText . "
";
    
    $decryptedText = decrypt($encryptedText, $key);
    echo "解密后的数据：" . $decryptedText . "
";
?>

<?php
    // 创建密钥对
    $config = array(
        "digest_alg" => "sha512",
        "private_key_bits" => 4096,
        "private_key_type" => OPENSSL_KEYTYPE_RSA,
    );
    
    $res = openssl_pkey_new($config);
    openssl_pkey_export($res, $privateKey);
    
    $publicKey = openssl_pkey_get_details($res);
    $publicKey = $publicKey["key"];
    
    // 加密函数
    function encrypt($data, $publicKey) {
        openssl_public_encrypt($data, $encrypted, $publicKey);
        $result = base64_encode($encrypted);
        return $result;
    }
    
    // 解密函数
    function decrypt($data, $privateKey) {
        $data = base64_decode($data);
        openssl_private_decrypt($data, $decrypted, $privateKey);
        return $decrypted;
    }
    
    // 测试示例
    $text = "Hello, World!";
    
    $encryptedText = encrypt($text, $publicKey);
    echo "加密后的数据：" . $encryptedText . "
";
    
    $decryptedText = decrypt($encryptedText, $privateKey);
    echo "解密后的数据：" . $decryptedText . "
";
?>

<?php
    // 加密函数
    function encrypt($data) {
        $result = md5($data);
        return $result;
    }
    
    // 测试示例
    $text = "Hello, World!";
    $encryptedText = encrypt($text);
    echo "加密后的数据：" . $encryptedText . "
";
?>