PHP開発スキル：データ暗号化機能の実装方法

function encryptData($data, $key){
    $iv = openssl_random_pseudo_bytes(openssl_cipher_iv_length('AES-256-CBC'));
    $encryptedData = openssl_encrypt($data, 'AES-256-CBC', $key, 0, $iv);
    $encryptedData = base64_encode($encryptedData . '::' . $iv);
    return $encryptedData;
}

function decryptData($encryptedData, $key){
    $parts = explode('::', base64_decode($encryptedData));
    $decryptedData = openssl_decrypt($parts[0], 'AES-256-CBC', $key, 0, $parts[1]);
    return $decryptedData;
}

// 示例用法
$data = 'Hello World!';
$key = 'my_secret_key';
$encryptedData = encryptData($data, $key);
$decryptedData = decryptData($encryptedData, $key);

echo '加密前的数据：' . $data . '<br>';
echo '加密后的数据：' . $encryptedData . '<br>';
echo '解密后的数据：' . $decryptedData . '<br>';

function encryptData($data, $publicKeyPath){
    $publicKey = openssl_pkey_get_public(file_get_contents($publicKeyPath));
    openssl_public_encrypt($data, $encryptedData, $publicKey, OPENSSL_PKCS1_PADDING);
    $encryptedData = base64_encode($encryptedData);
    return $encryptedData;
}

function decryptData($encryptedData, $privateKeyPath, $passphrase){
    $privateKey = openssl_pkey_get_private(file_get_contents($privateKeyPath), $passphrase);
    openssl_private_decrypt(base64_decode($encryptedData), $decryptedData, $privateKey, OPENSSL_PKCS1_PADDING);
    return $decryptedData;
}

// 示例用法
$data = 'Hello World!';
$publicKeyPath = 'public_key.pem';
$privateKeyPath = 'private_key.pem';
$passphrase = 'my_passphrase';
$encryptedData = encryptData($data, $publicKeyPath);
$decryptedData = decryptData($encryptedData, $privateKeyPath, $passphrase);

echo '加密前的数据：' . $data . '<br>';
echo '加密后的数据：' . $encryptedData . '<br>';
echo '解密后的数据：' . $decryptedData . '<br>';