Here's a quick example on how to use sodium_crypto_box_seal(); where you have 2 people exchanging a $message - person 1 encrypts it so that only person 2 can decrypt it. It does not allow person 2 to know who sent it, as only their public key way used (see sodium_crypto_box to do that).
<?php
$keypair = sodium_crypto_box_keypair();
$keypair_public = sodium_crypto_box_publickey($keypair);
$keypair_secret = sodium_crypto_box_secretkey($keypair);
// $key_public = sodium_crypto_box_publickey_from_secretkey($keypair_secret);
// $keypair = sodium_crypto_box_keypair_from_secretkey_and_publickey($keypair_secret, $key_public);
//--------------------------------------------------
// Person 1, encrypting
$message = 'hello';
$encrypted = sodium_crypto_box_seal($message, $keypair_public);
echo base64_encode($encrypted) . "\n";
//--------------------------------------------------
// Person 2, decrypting
$decrypted = sodium_crypto_box_seal_open($encrypted, $keypair);
echo $decrypted . "\n";
?>
sodium_crypto_box_seal
(PHP 7 >= 7.2.0)
sodium_crypto_box_seal — Encrypt a message
Description
sodium_crypto_box_seal
( string
$msg
, string $key
) : string
Warning
This function is currently not documented; only its argument list is available.
Parameters
-
msg -
-
key -
Return Values
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User Contributed Notes 1 note
craig at craigfrancis dot co dot uk ¶
1 year ago
