# openssl_x509_verify

(PHP 7 >= 7.4.0, PHP 8)

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

### Descripción

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`.

### Parámetros

`x509`

  Ver parámetros Key/Certificate para un listado de valores válidos.

`public_key`

  OpenSSLAsymmetricKey - a key, returned by openssl_get_publickey()

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

### Valores devueltos

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

### Historial de cambios

Versión | Descripción
--- | ---
8.0.0 | `certificate` accepts an OpenSSLCertificate instance now; previously, a recurso of type `OpenSSL X.509` was accepted.
8.0.0 | `public_key` accepts an OpenSSLAsymmetricKey or OpenSSLCertificate instance now; previously, a recurso of type `OpenSSL key` or `OpenSSL X.509` was accepted.

### Ejemplos

Ejemplo #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";
}
}
?>`

### Ver también

- openssl_verify() - Verificar una firma
- openssl_get_publickey() - Alias de openssl_pkey_get_public