array ( 0 => 'index.php', 1 => 'PHP Manual', ), 'head' => array ( 0 => 'UTF-8', 1 => 'fr', ), 'this' => array ( 0 => 'function.sodium-crypto-secretbox-open.php', 1 => 'sodium_crypto_secretbox_open', ), 'up' => array ( 0 => 'ref.sodium.php', 1 => 'Sodium Fonctions', ), 'prev' => array ( 0 => 'function.sodium-crypto-secretbox-keygen.php', 1 => 'sodium_crypto_secretbox_keygen', ), 'next' => array ( 0 => 'function.sodium-crypto-secretbox.php', 1 => 'sodium_crypto_secretbox', ), 'alternatives' => array ( ), 'source' => array ( 'lang' => 'en', 'path' => 'reference/sodium/functions/sodium-crypto-secretbox-open.xml', ), ); $setup["toc"] = $TOC; $setup["toc_deprecated"] = $TOC_DEPRECATED; $setup["parents"] = $PARENTS; manual_setup($setup); ?>
(PHP 7 >= 7.2.0, PHP 8)
sodium_crypto_secretbox_open — Authenticated shared-key decryption
Decrypt an encrypted message with a symmetric (shared) key.
ciphertext
Must be in the format provided by sodium_crypto_secretbox() (ciphertext and tag, concatenated).
nonce
A number that must be only used once, per message. 24 bytes long. This is a large enough bound to generate randomly (i.e. random_bytes()).
key
Encryption key (256-bit).
The decrypted string on success ou false
si une erreur survient.
nonce
has a length of bytes different than
SODIUM_CRYPTO_SECRETBOX_NONCEBYTES
(24 bytes), a SodiumException will be thrown.
key
has a length of bytes different than
SODIUM_CRYPTO_SECRETBOX_KEYBYTES
(32 bytes), a SodiumException will be thrown.
Exemple #1 sodium_crypto_secretbox_open() example
<?php
// The $key must be kept confidential
$key = random_bytes(SODIUM_CRYPTO_SECRETBOX_KEYBYTES);
// Do not reuse $nonce with the same key
$nonce = random_bytes(SODIUM_CRYPTO_SECRETBOX_NONCEBYTES);
$ciphertext = sodium_crypto_secretbox('message to be encrypted', $nonce, $key);
// The same nonce and key are required to decrypt the $ciphertext
$plaintext = sodium_crypto_secretbox_open($ciphertext, $nonce, $key);
if ($plaintext !== false) {
echo $plaintext . PHP_EOL;
}
?>
L'exemple ci-dessus va afficher :
message to be encrypted