* Controleer of het een verplicht attribuut `price` heeft en dat dat een`float` is.
    * Controleer of het een optioneel attribuut `is_offer` heeft, dat een `bool` is wanneer het aanwezig is.
    * Dit alles werkt ook voor diep geneste JSON objecten.
* Converteer automatisch van en naar JSON.
* Documenteer alles met OpenAPI, dat gebruikt kan worden door:

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        String sessionId = "test-session-1";
        byte[] salt = preauthService.generatePreauthSalt();

        PreauthIntegrityContext context = preauthService.initializeSession(sessionId, salt, PreauthIntegrityService.HASH_ALGO_SHA512);

        assertNotNull(context);
        assertEquals(PreauthIntegrityService.HASH_ALGO_SHA512, context.getHashAlgorithm());
        assertArrayEquals(salt, context.getSalt());
        assertTrue(context.isValid());

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    }

    /**
     * Generates a new preauth salt for SMB 3.1.1 negotiation.
     *
     * @return a cryptographically secure random salt
     */
    public byte[] generatePreauthSalt() {
        byte[] salt = new byte[SALT_SIZE];
        secureRandom.nextBytes(salt);
        log.debug("Generated new preauth salt of {} bytes", salt.length);
        return salt;
    }

    /**

            final byte[] salt = new byte[32];
            config.getRandom().nextBytes(salt);
            negoContexts.add(
                    new PreauthIntegrityNegotiateContext(config, new int[] { PreauthIntegrityNegotiateContext.HASH_ALGO_SHA512 }, salt));
            this.preauthSalt = salt;

            if (config.isEncryptionEnabled()) {

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