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 )
Returns 1 if the signature is correct, 0 if it is incorrect, and
-1 on error.
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.
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); ?>
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See also openssl_sign().