   #PHP Manual OpenSSL functions openssl_get_publickey
   openssl_pkcs7_decrypt

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                                 openssl_open

   (PHP 4 >= 4.0.4)
   openssl_open -- Open sealed data

Description

   bool openssl_open ( string sealed_data, string open_data, string
   env_key, mixed priv_key_id)

   Returns TRUE on success or FALSE on failure. If successful the opened
   data is returned in open_data.

   openssl_open() opens (decrypts) sealed_data using the private key
   associated with the key identifier priv_key_id and the envelope key
   env_key, and fills open_data 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.

   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 openssl_seal().
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