openssl_seal
(PHP 4 >= 4.0.4, PHP 5, PHP 7)
openssl_seal — Seal (encrypt) data
Description
openssl_seal ( string $data , string &$sealed_data , array &$env_keys , array $pub_key_ids [, string $method = "RC4" [, string &$iv ]] ) : int
openssl_seal() seals (encrypts) data by using the given method with a randomly generated secret key. The key is encrypted with each of the public keys associated with the identifiers in pub_key_ids and each encrypted key is returned in env_keys. This means that one can send sealed data to multiple recipients (provided one has obtained their public keys). Each recipient must receive both the sealed data and the envelope key that was encrypted with the recipient's public key.
Parameters
-
data -
The data to seal.
-
sealed_data -
The sealed data.
-
env_keys -
Array of encrypted keys.
-
pub_key_ids -
Array of public key resource identifiers.
-
method -
The cipher method.
CautionThe default value (
'RC4') is considered insecure. It is strongly recommended to explicitly specify a secure cipher method. -
iv -
The initialization vector.
Return Values
Returns the length of the sealed data on success, or false on error. If successful the sealed data is returned in sealed_data, and the envelope keys in env_keys.
Examples
Example #1 openssl_seal() example
<?php
// $data is assumed to contain the data to be sealed
// fetch public keys for our recipients, and ready them
$fp = fopen("/src/openssl-0.9.6/demos/maurice/cert.pem", "r");
$cert = fread($fp, 8192);
fclose($fp);
$pk1 = openssl_get_publickey($cert);
// Repeat for second recipient
$fp = fopen("/src/openssl-0.9.6/demos/sign/cert.pem", "r");
$cert = fread($fp, 8192);
fclose($fp);
$pk2 = openssl_get_publickey($cert);
// seal message, only owners of $pk1 and $pk2 can decrypt $sealed with keys
// $ekeys[0] and $ekeys[1] respectively.
openssl_seal($data, $sealed, $ekeys, array($pk1, $pk2));
// free the keys from memory
openssl_free_key($pk1);
openssl_free_key($pk2);
?> See Also
- openssl_open() - Open sealed data
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Licensed under the Creative Commons Attribution License v3.0 or later.
https://www.php.net/manual/en/function.openssl-seal.php