如何从PHP OpenSSL库中现有的RSA公钥中获取模数和指数 - How to acquire Modulus and Exponent from existing RSA Public Key in PHP OpenSSL Library

How to acquire Modulus and Exponent from existing RSA Public Key in PHP OpenSSL Library

本文关键字：公钥 RSA 获取指数 PHP OpenSSL | 更新日期: 2024-01-30

有私钥、公钥、x509 Pem文件。我想从这些文件中获取有关RSA公钥的信息。

我可以通过如下shell脚本来确认它。$openssl x509-在cert.pem中-文本

    Subject Public Key Info:
        Public Key Algorithm: rsaEncryption
        RSA Public Key: (2048 bit)
            Modulus (2048 bit):
                00:e1:92:dc:05:84:c7:e1:2d:db:f3:48:84:90:32:
                ...
                da:7d:2f:95:d2:ab:28:6e:6c:be:0a:af:e0:cb:24:
                18:db
            Exponent: 65537 (0x10001)

我可以用同样的方式在PHP OpenSSL库中获取模量和指数的值吗？

您可以尝试以下操作：

$key = file_get_contents("root/to/private_key.pem");
$data = openssl_pkey_get_private($key);
$data = openssl_pkey_get_details($data);
$key = $data['key'];
$modulus = $data['rsa']['n'];
$exponent = $data['rsa']['e'];
echo "Modulus: $modulus <br>Exponent: $exponent";

如果回显$exponent在屏幕上什么都不显示，您可以尝试var_dump($exponent)或var_dump($data)，您会看到一些奇怪的字符。

使用phpseclib，一个纯PHP X.509实现：

$x509 = new File_X509();
$cert = $x509->loadX509('-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----');
$pubkey = $x509->getPublicKey();
$parts = $pubkey->getPublicKey(CRYPT_RSA_PUBLIC_FORMAT_RAW);
echo $parts['e'] . "'r'n'r'n" . $parts['n'];

您可能想要openssl_pkey_get_details($key)。

这将获取从openssl_pkey_get_private()或openssl_pkey_get_public()（？）生成的密钥资源，并将返回一个数组，其中包含密钥bits、key、type，以及第四个密钥，即rsa、dsa或dh中的一个，具体取决于密钥。第四个键映射到另一个具有更多细节的数组；对于RSA密钥，此子数组包含模数n和指数e。

有关更多用法说明，请参阅本页和PHP文档中的相关页面。

（这些都没有经过测试；让我知道这是否适用于您！）