function encryptData($data, $key) {
    $method = 'AES-256-CBC';
    $iv = openssl_random_pseudo_bytes(openssl_cipher_iv_length($method));
    $encrypted = openssl_encrypt($data, $method, $key, 0, $iv);
    return base64_encode($iv . $encrypted);
}
function decryptData($encryptedData, $key) {
$data = base64_decode($encryptedData);
$method = 'AES-256-CBC';
$ivLength = openssl_cipher_iv_length($method);
$iv = substr($data, 0, $ivLength);
$encrypted = substr($data, $ivLength);
return openssl_decrypt($encrypted, $method, $key, 0, $iv);
}
// 使用示例
$key = 'your-32-byte-secret-key-here!!!'; // 必须与算法匹配
$original = "敏感信息";
$encrypted = encryptData($original, $key);
$decrypted = decryptData($encrypted, $key);
echo $decrypted; // 输出：敏感信息

# 生成私钥
openssl genrsa -out private.key 2048
提取公钥
openssl rsa -in private.key -pubout -out public.key

function encryptWithPublicKey($data, $publicKeyPath) {
    $publicKey = file_get_contents($publicKeyPath);
    openssl_public_encrypt($data, $encrypted, $publicKey);
    return base64_encode($encrypted);
}
function decryptWithPrivateKey($data, $privateKeyPath, $password = null) {
$privateKey = file_get_contents($privateKeyPath);
$res = openssl_get_privatekey($privateKey, $password);
openssl_private_decrypt(base64_decode($data), $decrypted, $res);
return $decrypted;
}

$hash = password_hash('user_password', PASSWORD_DEFAULT);
if (password_verify('user_input', $hash)) {
    echo "密码正确";
}