PHP. Руководство по PHP. 2005

openssl_seal

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openssl_seal

(PHP 4 >= 4.0.4, PHP 5)openssl_seal -- Seal (encrypt) data

Description

int openssl_seal (string data, string &sealed_data, array &env_keys, array pub_key_ids)

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.

openssl_seal() seals (encrypts)

data by using RC4 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.

Пример 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);
?>

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