Verifies digital signature of x509 certificate against a public key

- « openssl_x509_read

- OpenSSLCertificate »

- PHP Manual
- OpenSSL Functions
- Verifies digital signature of x509 certificate against a public key

# openssl_x509_verify

(PHP 7 >= 7.4.0, PHP 8)

openssl_x509_verify — Verifies digital signature of x509 certificate against a public key

### Description

openssl_x509_verify(OpenSSLCertificate|string `$certificate`, OpenSSLAsymmetricKey|OpenSSLCertificate|array|string `$public_key`): int

openssl_x509_verify() verifies that the `certificate` certificate was signed by the private key corresponding to public key `public_key`.

### Parameters

`x509`

  See Key/Certificate parameters for a list of valid values.

`public_key`

  OpenSSLAsymmetricKey - a key, returned by openssl_get_publickey()

  string - a PEM formatted key (e.g. `-----BEGIN PUBLIC KEY----- MIIBCgK...`)

### Return Values

Returns 1 if the signature is correct, 0 if it is incorrect, and -1 on error.

### Changelog

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.

### 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