e2ee

type DefaultSessionManager struct {
	// contains filtered or unexported fields
}

type DoubleRatchetSession struct {
	// contains filtered or unexported fields
}

type EncryptedMessage struct {
	SenderID   string `json:"sender_id"`
	ReceiverID string `json:"receiver_id"`
	Ciphertext []byte `json:"ciphertext"`
	Header     []byte `json:"header"` // Double Ratchet header (DH public key, message counter, etc.)
	Timestamp  int64  `json:"timestamp"`
}

type KeyStore interface {
	// Identity Keys (public only, for server-side storage)
	SaveIdentityPublicKey(ctx context.Context, userID string, pubKey []byte) error
	LoadIdentityPublicKey(ctx context.Context, userID string) ([]byte, error)

	// PreKey Bundles (public bundle for X3DH)
	SavePreKeyBundle(ctx context.Context, userID string, bundle *PublicPreKeyBundle) error
	LoadPreKeyBundle(ctx context.Context, userID string) (*PublicPreKeyBundle, error)
	ConsumeOneTimePreKey(ctx context.Context, userID string) error

	// Session State (ratchet state, stored client-side)
	SaveSession(ctx context.Context, sessionID string, state []byte) error
	LoadSession(ctx context.Context, sessionID string) ([]byte, error)
}

type PublicPreKeyBundle struct {
	DeviceID       string                     `json:"device_id"`      // Unique ID for the device publishing this bundle
	IdentityKey    ed25519.PublicKey          `json:"identity_key"`   // Ed25519 identity public key
	SignedPreKey   *ecdh.PublicKey            `json:"-"`              // X25519 signed prekey (public)
	SPKSignature   []byte                     `json:"spk_signature"`  // Ed25519 signature of the SPK
	SPKCreatedAt   int64                      `json:"spk_created_at"` // Timestamp when the SPK was generated
	OneTimePreKeys map[uint32]*ecdh.PublicKey `json:"-"`              // X25519 one-time prekeys (indexed)

	// Serialized forms for JSON transport
	SignedPreKeyBytes   []byte            `json:"signed_prekey"`
	OneTimePreKeysBytes map[uint32][]byte `json:"one_time_prekeys,omitempty"`
}

type SQLKeyStore struct {
	// contains filtered or unexported fields
}

type Session struct {
	ID        string    `json:"id"`
	UserA     string    `json:"user_a"`
	UserB     string    `json:"user_b"`
	State     []byte    `json:"state"` // Serialized Double Ratchet state
	CreatedAt time.Time `json:"created_at"`
	UpdatedAt time.Time `json:"updated_at"`
}

type X3DHKeyMaterial struct {
	IdentityKey    ed25519.PrivateKey // Ed25519 identity key (long-lived)
	SignedPreKey   *ecdh.PrivateKey   // X25519 signed prekey (medium-lived)
	SPKSignature   []byte             // Ed25519 signature of the SPK public key
	OneTimePreKeys []*ecdh.PrivateKey // X25519 one-time prekeys (single-use)
}