openssl_open

(PHP 4 >= 4.0.4, PHP 5, PHP 7)

openssl_open — Open sealed data

Descrierea

openssl_open ( string $sealed_data , string &$open_data , string $env_key , mixed $priv_key_id , string $method = "RC4" , string $iv = ? ) : bool

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.

Parametri

sealed_data

open_data

If the call is successful the opened data is returned in this parameter.

env_key

priv_key_id

method

The cipher method.

Precauţie

The default value ('RC4') is considered insecure. It is strongly recommended to explicitly specify a secure cipher method.

iv

The initialization vector.

Valorile întoarse

Întoarce valoarea true în cazul succesului sau false în cazul eșecului.

Exemple

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);
?>

A se vedea și

openssl_seal() - Seal (encrypt) data

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User Contributed Notes 2 notes

down

sdc ¶

13 years ago


PHP compiled without OpenSSL support? Here's how you can call the openssl command-line utility to achieve the same goal:

<?php
// $sealed and $env_key are assumed to contain the sealed data
// and our envelope key, both given to us by the sealer.

// specify private key file and passphrase
$pkey_file='key.pem';
$pkey_pp='netsvc';

// call openssl to decrypt envelope key
$ph=proc_open('openssl rsautl -decrypt -inkey '.
 escapeshellarg($pkey_file).' -passin fd:3',array(
  0 => array('pipe','r'), // stdin < envelope key
  1 => array('pipe','w'), // stdout > decoded envelope key
  2 => STDERR,
  3 => array('pipe','r'), // < passphrase
 ),$pipes);
// write envelope key
fwrite($pipes[0],$env_key);
fclose($pipes[0]);
// write private key passphrase
fwrite($pipes[3],$pkey_pp);
fclose($pipes[3]);
// read decoded key, convert to hexadecimal
$env_key='';
while(!feof($pipes[1])){
  $env_key.=sprintf("%02x",ord(fgetc($pipes[1])));
}
fclose($pipes[1]);
if($xc=proc_close($ph)){
  echo "Exit code: $xc\n";
}

// call openssl to decryp
$ph=proc_open('openssl rc4 -d -iv 0 -K '.$env_key,array(
  0 => array('pipe','r'), // stdin < sealed data
  1 => array('pipe','w'), // stdout > opened data
  2 => STDERR,
 ),$pipes);
// write sealed data
fwrite($pipes[0],$sealed);
fclose($pipes[0]);
// read opened data
//$open=stream_get_contents($pipes[1]);
$open='';
while(!feof($pipes[1])){
  $open.=fgets($pipes[1]);
}
fclose($pipes[1]);
if($xc=proc_close($ph)){
  echo "Exit code: $xc\n";
}

// display the decrypted data
echo $open;

?>

down

-1

Gareth Owen ¶

15 years ago


Example code, assume mycert.pem is a certificate containing both private and public key.

$cert = file_get_contents("mycert.pem");

$public = openssl_get_publickey($cert);
$private = openssl_get_privatekey($cert);

$data = "I'm a lumberjack and I'm okay.";

echo "Data before: {$data}\n";
openssl_seal($data, $cipher, $e, array($public));

echo "Ciphertext: {$cipher}\n";

openssl_open($cipher, $open, $e[0], $private);
echo "Decrypted: {$open}\n";

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