(PHP 7 >= 7.4.0, PHP 8)
openssl_x509_verify — Verifies digital signature of x509 certificate against a public key
$certificate, OpenSSLAsymmetricKey|OpenSSLCertificate|array|string $public_key): int
openssl_x509_verify() verifies that the
certificate certificate was signed by the private
key corresponding to public key public_key.
x509See Key/Certificate parameters for a list of valid values.
public_keyOpenSSLAsymmetricKey - a key, returned by openssl_get_publickey()
string - a PEM formatted key (e.g. -----BEGIN PUBLIC KEY-----
MIIBCgK...)
Returns 1 if the signature is correct, 0 if it is incorrect, and -1 on error.
| Version | Description |
|---|---|
| 8.0.0 |
certificate accepts an OpenSSLCertificate instance now;
previously, a resource of type OpenSSL X.509 was accepted.
|
| 8.0.0 |
public_key accepts an OpenSSLAsymmetricKey
or OpenSSLCertificate instance now;
previously, a resource of type OpenSSL key or OpenSSL X.509
was accepted.
|
Example #1 openssl_x509_verify() example
<?php
$hostname = "news.php.net";
$ssloptions = array(
"capture_peer_cert" => true,
"capture_peer_cert_chain" => true,
"allow_self_signed"=> false,
"CN_match" => $hostname,
"verify_peer" => true,
"SNI_enabled" => true,
"SNI_server_name" => $hostname,
);
$ctx = stream_context_create( array("ssl" => $ssloptions) );
$result = stream_socket_client("ssl://$hostname:443", $errno, $errstr, 30, STREAM_CLIENT_CONNECT, $ctx);
$cont = stream_context_get_params($result);
$x509 = $cont["options"]["ssl"]["peer_certificate"];
$certparsed = openssl_x509_parse($x509);
foreach($cont["options"]["ssl"]["peer_certificate_chain"] as $chaincert)
{
$chainparsed = openssl_x509_parse($chaincert);
$chain_public_key = openssl_get_publickey($chaincert);
$r = openssl_x509_verify($x509, $chain_public_key);
if ($r==1)
{
echo $certparsed['subject']['CN'];
echo " was digitally signed by ";
echo $chainparsed['subject']['CN']."\n";
}
}
?>