====== WvdS.System.Security.Cryptography.KeyExchange prostor imena ======

Sadrži klase za post-kvantnu razmjenu ključeva s ML-KEM.

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===== Klase =====

^  Klasa  ^  Opis  ^
| [[.:keyexchangeservice|KeyExchangeService]] | High-level servis za Client/Server razmjenu ključeva |
| [[.:ephemeralkeypar|EphemeralKeyPair]] | Kontejner za kratkotrajne ML-KEM/ML-DSA parove ključeva |
| [[.:securesession|SecureSession]] | Predstavlja uspostavljenu sigurnu sesiju |

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===== Klase zahtjeva/odgovora =====

^  Klasa  ^  Opis  ^
| [[.:keyexchangeinitrequest|KeyExchangeInitRequest]] | Poruka inicijacije klijenta |
| [[.:keyexchangeinitresponse|KeyExchangeInitResponse]] | Poruka odgovora poslužitelja |
| [[.:keyexchangeconfirmrequest|KeyExchangeConfirmRequest]] | Poruka potvrde klijenta |
| [[.:keyexchangeconfirmresponse|KeyExchangeConfirmResponse]] | Odgovor potvrde poslužitelja |

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===== Tijek protokola =====

<code>
Klijent                             Poslužitelj
  |                                    |
  +- GenerateClientKeysAsync()         |
  |                                    |
  +- CreateInitRequest() --------------+
  |   (ML-KEM PubKey + ML-DSA Sig)     |
  |                                    +- ProcessClientRequest()
  |                                    |   (Verify, Encapsulate)
  |<------------------ InitResponse ---+
  |   (Ciphertext + ML-DSA Sig)        |
  |                                    |
  +- ProcessServerResponse()           |
  |   (Verify, Decapsulate)            |
  |                                    |
  +- CreateConfirmRequest() -----------+
  |   (HMAC Confirmation)              |
  |                                    +- VerifyConfirmation()
  |<---------------- ConfirmResponse --+
  |                                    |
  v                                    v
  SecureSession                   SecureSession
  (Shared Secret)                 (Shared Secret)
</code>

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===== Primjer =====

<code csharp>
using WvdS.System.Security.Cryptography.KeyExchange;

var kex = new KeyExchangeService();

// === Klijent ===
var clientKeys = await kex.GenerateClientKeysAsync();
var initRequest = await kex.CreateInitRequestAsync(clientKeys);

// Pošalji initRequest poslužitelju...

// === Poslužitelj ===
var serverKeys = await kex.GenerateServerKeysAsync();
var (response, serverSession) = await kex.ProcessClientRequestAsync(
    initRequest, serverKeys);

// Pošalji response klijentu...

// === Klijent ===
var clientSession = await kex.ProcessServerResponseAsync(
    response, clientKeys);

// Oba sada imaju identičan dijeljeni tajni ključ!
</code>

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===== Vidi također =====

  * [[..:encryption:start|Encryption prostor imena]]
  * [[..:keyderivation:start|KeyDerivation prostor imena]]
  * [[..:..:..:api:start|API-pregled]]

{{tag>namespace keyexchange ml-kem}}

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//Wolfgang van der Stille @ EMSR DATA d.o.o. - Post-Quantum Cryptography Professional//