如何在PHP语言中使用p8表单私钥对数据进行数字签名和公钥验证

// 生成密钥对
$config = array(
    "private_key_bits" => 2048,
    "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"];

// 加载私钥
$privateKeyResource = openssl_pkey_get_private($privateKey);

// 待签名的数据
$data = "Hello, World!";

// 创建签名
openssl_sign($data, $signature, $privateKeyResource, OPENSSL_ALGO_SHA256);

// 验证签名
$publicKeyResource = openssl_pkey_get_public($publicKey);
$isValid = openssl_verify($data, $signature, $publicKeyResource, OPENSSL_ALGO_SHA256);

if ($isValid == 1) {
    echo "签名有效";
} elseif ($isValid == 0) {
    echo "签名无效";
} else {
    echo "验证过程发生错误";
}

// 释放资源
openssl_free_key($privateKeyResource);
openssl_free_key($publicKeyResource);