sodium_crypto_secretbox

(PHP 7 >= 7.2.0, PHP 8)

sodium_crypto_secretboxAuthenticated shared-key encryption

Descripción

sodium_crypto_secretbox(string $message, string $nonce, string $key): string

Encrypt a message with a symmetric (shared) key.

Parámetros

message

The plaintext message to encrypt.

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).

Valores devueltos

Returns the encrypted string.

Errores/Excepciones

Ejemplos

Ejemplo #1 sodium_crypto_secretbox() example

<?php
// The $key must be kept confidential
$key sodium_crypto_secretbox_keygen();
// Do not reuse $nonce with the same key
$nonce random_bytes(SODIUM_CRYPTO_SECRETBOX_NONCEBYTES);
$plaintext "message to be encrypted";
$ciphertext sodium_crypto_secretbox($plaintext$nonce$key);

var_dump(bin2hex($ciphertext));
// The same nouce and key are required to decrypt the $ciphertext
var_dump(sodium_crypto_secretbox_open($ciphertext$nonce$key));
?>

El resultado del ejemplo sería algo similar a:

string(78) "3a1fa3e9f7b72ef8be51d40abf8e296c6899c185d07b18b4c93e7f26aa776d24c50852cd6b1076"
string(23) "message to be encrypted"

Ver también

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User Contributed Notes 1 note

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1
celso fontes
1 year ago
An example to how encrypt or decrypt using sodium:

<?php

$key
= random_bytes(SODIUM_CRYPTO_SECRETBOX_KEYBYTES);

$nonce = random_bytes(SODIUM_CRYPTO_SECRETBOX_NONCEBYTES);
$ciphertext = sodium_crypto_secretbox("Hello World !", $nonce, $key);

$plaintext = sodium_crypto_secretbox_open($ciphertext, $nonce, $key);
if (
$plaintext === false) {
    throw new
Exception("Bad ciphertext");
}

echo
$plaintext;
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