openssl_verify

(PHP 4 >= 4.0.4, PHP 5)

openssl_verify — Verify signature

Description

int openssl_verify ( string $data , string $signature , mixed $pub_key_id [, int $signature_alg = OPENSSL_ALGO_SHA1 ] )

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

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

Version Description
5.2.0 The signature_alg parameter was added.

Examples

Example #1 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);
?>

See Also