sodium_crypto_box_seal

    (PHP 7 >= 7.2.0, PHP 8)

    sodium_crypto_box_seal — Anonymous public-key encryption

    Опис

    sodium_crypto_box_seal(#[\SensitiveParameter] string $message, string $public_key): string

    Encrypt a message such that only the recipient can decrypt it.

    Unlike with sodium_crypto_box(), you only need to know the recipient's public key to use sodium_crypto_box_seal(). One consequence of this convenience, however, is that the ciphertext isn't bound to a static public key, and is therefore not authenticated. Hence, anonymous public-key encryption.

    sodium_crypto_box_seal() still provides ciphertext integrity. Just not sender identity authentication.

    If you also need sender authentication, the sodium_crypto_sign() functions are likely the best place to start.

    Параметри

    message

    The message to encrypt.

    public_key

    The public key that corresponds to the only key that can decrypt the message.

    Значення, що повертаються

    A ciphertext string in the format of (one-time public key, encrypted message, authentication tag).

    Приклади

    Приклад #1 sodium_crypto_box_seal() example

    <?php
    $keypair     = sodium_crypto_box_keypair();
    $public_key = sodium_crypto_box_publickey($keypair);

    // Obfuscated plaintext to make the example more fun
    $plaintext_b64 = "V3JpdGluZyBzb2Z0d2FyZSBpbiBQSFAgY2FuIGJlIGEgZGVsaWdodCE=";
    $decoded_plaintext = sodium_base642bin($plaintext_b64, SODIUM_BASE64_VARIANT_ORIGINAL);

    $sealed = sodium_crypto_box_seal($decoded_plaintext, $public_key);
    var_dump(base64_encode($sealed));

    $opened = sodium_crypto_box_seal_open($sealed, $keypair);
    var_dump($opened);
    ?>

    Поданий вище приклад виведе щось схоже на:

    string(120) "oRBXXAV4iQBrxlV4A21Bord8Yo/D8ZlrIIGNyaRCcGBfpz0map52I3xq6l+CST+1NSgQkbV+HiYyFjXWiWiaCGupGf+zl4bgWj/A9Adtem7Jt3h3emrMsLw="
string(41) "Writing software in PHP can be a delight!"

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    User Contributed Notes 1 note

    up
    9
    craig at craigfrancis dot co dot uk
    6 years ago
    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";

    ?>
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