openssl_x509_verify
(PHP 7 >= 7.4.0)
openssl_x509_verify — Verifies digital signature of x509 certificate against a public key
Description
openssl_x509_verify ( mixed $x509 , mixed $pub_key_id ) : int
openssl_x509_verify() verifies that the x509 certificate was signed by the private key corresponding to public key pub_key_id.
Parameters
-
x509 -
See Key/Certificate parameters for a list of valid values.
-
pub_key_id -
resource - a key, returned by openssl_get_publickey()
string - a PEM formatted key, example, "-----BEGIN PUBLIC KEY----- MIIBCgK..."
Return Values
Returns 1 if the signature is correct, 0 if it is incorrect, and -1 on error.
Examples
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";
}
}
?> See Also
- openssl_verify() - Verify signature
- openssl_get_publickey() - Alias of openssl_pkey_get_public
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Licensed under the Creative Commons Attribution License v3.0 or later.
https://www.php.net/manual/en/function.openssl-x509-verify.php