sodium_crypto_secretbox_open

    (PHP 7 >= 7.2.0, PHP 8)

    sodium_crypto_secretbox_open — Authenticated shared-key decryption

    Descripción

    sodium_crypto_secretbox_open(string$ciphertext, string$nonce, string$key): string|false

    Decrypt an encrypted message with a symmetric (shared) key.

    Parámetros

    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).

    Valores devueltos

    The decrypted string on success o false en caso de error.

    Errores/Excepciones

    Ejemplos

    Ejemplo #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;
    }
    ?>

    El resultado del ejemplo sería:

    message to be encrypted

    Ver también

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