   #PHP Manual OpenSSL functions openssl_public_encrypt openssl_sign

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                                 openssl_seal

   (PHP 4 >= 4.0.4)
   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.

   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().
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