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openssl_verify

Verify signature (PHP 4 >= 4.0.4, PHP 5)
int openssl_verify ( string data, string signature, mixed pub_key_id [, int signature_alg] )

openssl_verify() verifies that the signature is correct for the specified data using the public key associated with pub_key_id. This must be the public key corresponding to the private key used for signing.

Parameters

data
signature
pub_key_id
signature_alg

Defaults to OPENSSL_ALGO_SHA1. For more information see the list of Signature Algorithms.

Return Values

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

ChangeLog

VersionDescription
5.0.0 The signature_alg parameter was added.

Examples

Example 1678. openssl_verify() example

<?php
// $data and $signature are assumed to contain the data and the signature

// fetch public key from certificate and ready it
$fp = fopen("/src/openssl-0.9.6/demos/sign/cert.pem", "r");
$cert = fread($fp, 8192);
fclose($fp);
$pubkeyid = openssl_get_publickey($cert);

// state whether signature is okay or not
$ok = openssl_verify($data, $signature, $pubkeyid);
if (
$ok == 1) {
   echo
"good";
} elseif (
$ok == 0) {
   echo
"bad";
} else {
   echo
"ugly, error checking signature";
}
// free the key from memory
openssl_free_key($pubkeyid);
?>