openssl_open

(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)

openssl_open — Open sealed data

Description

openssl_open(
    string $data,
    string &$output,
    string $encrypted_key,
    OpenSSLAsymmetricKey|OpenSSLCertificate|array|string $private_key,
    string $cipher_algo,
    ?string $iv = null
): bool

openssl_open() opens (decrypts) data using the private key associated with the key identifier private_key and the envelope key encrypted_key, and fills output with the decrypted data. The envelope key is generated when the data are sealed and can only be used by one specific private key. See openssl_seal() for more information.

Parameters

data

output

If the call is successful the opened data is returned in this parameter.

encrypted_key

private_key

cipher_algo

The cipher method.

Caution

The default value ('RC4') is considered insecure. It is strongly recommended to explicitly specify a secure cipher method.

iv

The initialization vector.

Return Values

Returns true on success or false on failure.

Changelog

Version Description
8.0.0 private_key accepts an OpenSSLAsymmetricKey or OpenSSLCertificate instance now; previously, a resource of type OpenSSL key or OpenSSL X.509 CSR was accepted.
8.0.0 cipher_algo is no longer an optional parameter.

Examples

Example #1 openssl_open() example

<?php
// $sealed and $env_key are assumed to contain the sealed data
// and our envelope key, both given to us by the sealer.

// fetch private key from file and ready it
$fp = fopen("/src/openssl-0.9.6/demos/sign/key.pem", "r");
$priv_key = fread($fp, 8192);
fclose($fp);
$pkeyid = openssl_get_privatekey($priv_key);

// decrypt the data and store it in $open
if (openssl_open($sealed, $open, $env_key, $pkeyid)) {
    echo "here is the opened data: ", $open;
} else {
    echo "failed to open data";
}

// free the private key from memory
openssl_free_key($pkeyid);
?>

See Also