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openssl_verify -- Verify signature


int openssl_verify (string data, string signature, int 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

// $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().