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# 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] )

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.

> Nota: Optional 4th parameter `signature_alg` was added in version 5.2.0. Its default value is `OPENSSL_ALGO_SHA1`. For more information see the list of Signature Algorithms.

Exemplo 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 openssl_sign().

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