OPENSSL_SEAL(3) 1 OPENSSL_SEAL(3)
openssl_seal - Seal (encrypt) data
SYNOPSIS
int openssl_seal (string $data, string &$sealed_data, array &$env_keys, array $pub_key_ids, [string $method])
DESCRIPTION
openssl_seal(3) 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.
PARAMETERS
o $data
-
o $sealed_data
-
o $env_keys
-
o $pub_key_ids
-
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(3) 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(3).
PHP Documentation Group OPENSSL_SEAL(3)
