X509 Check Private Key
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X509_check_private_key, X509_REQ_check_private_key - check the consistency of a private key with the public key in an X509 certificate or certificate request
X509_check_private_key() function checks the consistency of private key k with the public key in x.
X509_REQ_check_private_key() is equivalent to X509_check_private_key() except that x represents a certificate request of structure X509_REQ.
X509_check_private_key() and X509_REQ_check_private_key() return 1 if the keys match each other, and 0 if not.
If the key is invalid or an error occurred, the reason code can be obtained using ERR_get_error(3).
The check_private_key functions don't check if k itself is indeed a private key or not. It merely compares the public materials (e.g. exponent and modulus of an RSA key) and/or key parameters (e.g. EC params of an EC key) of a key pair. So if you pass a public key to these functions in k, it will return success.
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(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)
openssl_x509_check_private_key — Проверить, относится ли секретный ключ к сертификату
openssl_x509_check_private_key(OpenSSLCertificate|string $certificate, OpenSSLAsymmetricKey|OpenSSLCertificate|array|string $private_key): bool
Проверяет, что заданный private_key является секретным ключом, соответствующим сертификату certificate.
Функция не проверяет, является ли private_key секретным ключом или нет. Он просто сравнивает открытые данные (например, экспоненту и модуль ключа RSA) и/или параметры ключа (например, параметры EC для EC-ключа) пары ключей.
То есть, если поместить в private_key соответствующий открытый ключ, то функция может вернуть true.
Возвращает true, если private_key является ключом соответствующим сертификату certificate, или false в противном случае.
certificate теперь принимает экземпляр OpenSSLCertificate; ранее принимался ресурс (resource) типа OpenSSL X.509.
private_key теперь принимает экземпляр OpenSSLAsymmetricKey или OpenSSLCertificate; ранее принимался ресурс (resource) типа OpenSSL key или OpenSSL X.509.
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User Contributed Notes 2 notes
This function DOES return TRUE if the key has a passphrase, you just need to set up the data in such a way that the function can understand it. It is not documented here.
This error message led me to the solution:
PHP Warning: openssl_x509_check_private_key(): key array must be of the form array(0 => key, 1 => phrase)
So this works:
$certFile = file_get_contents('cert.crt');
$keyFile = file_get_contents('cert.key');
$keyPassphrase = "password1234";
$keyCheckData = array(0=>$keyFile,1=>$keyPassphrase);
$result = openssl_x509_check_private_key($certFile,$keyCheckData);
This function will return FALSE if the private key requires a pass phrase.
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X509 Check Private Key
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