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package kms
import (
"context"
"errors"
"fmt"
"io"
"net"
"sync"
"time"
pbIC "code.fbi.h-da.de/danet/proto-kms/api/gen/proto/go/kmsintercom"
"code.fbi.h-da.de/danet/proto-kms/quantumlayer"
"github.com/google/uuid"
"github.com/sirupsen/logrus"
log "github.com/sirupsen/logrus"
)
// QuantumModule ...
type QuantumModule interface {
ID() uuid.UUID
Initialize() error
// NOTE: Sync will be removed as soon as the emulated quantum module has been
// changed to push a constant byte stream.
Sync() error
KeyStore() *kmsKeyStore
Peer() *kmsPeer
SetPeer(*kmsPeer)
Address() net.Addr
}
type EmulatedQuantumModule struct {
QlID uuid.UUID
QuantumElementLink *quantumlayer.QuantumlayerEmuPRNG // contains information about the quantum links
//key stores of unchopped bulk keys go here
rawBulkKeysMutex sync.Mutex
rawBulkKeys map[int64]*quantumlayer.QuantumLayerBulkKey
keyStore *kmsKeyStore // the keys used between two peers.
peer *kmsPeer
}
func NewEmulatedQuantumModule(kmsUDPAddr string, generateKeys bool, logOutput io.Writer, logLevel log.Level, logInJson bool) *EmulatedQuantumModule {
// create an emulated quantum layer
ql := quantumlayer.NewQuantumlayerEmuPRNG(logOutput, logLevel, logInJson)
ql.Configure(kmsUDPAddr)
ql.PowerOn(generateKeys)
return &EmulatedQuantumModule{
QlID: uuid.New(),
QuantumElementLink: ql,
rawBulkKeys: make(map[int64]*quantumlayer.QuantumLayerBulkKey),
keyStore: NewKmsKeyStore(256),
peer: nil,
}
}
func (eqe *EmulatedQuantumModule) ID() uuid.UUID {
return eqe.QlID
}
func (eqe *EmulatedQuantumModule) Initialize() error {
// TODO: error handling
go eqe.keyHandler()
return nil
}
func (eqe *EmulatedQuantumModule) Address() net.Addr {
return eqe.QuantumElementLink.GetLocalQLPort()
}
func (eqe *EmulatedQuantumModule) KeyStore() *kmsKeyStore {
return eqe.keyStore
}
func (eqe *EmulatedQuantumModule) Sync() error {
rawBulkKeyIds := keysOfMap[int64](eqe.rawBulkKeys)
logrus.Info("Found the following bulk key ids for usage: ", rawBulkKeyIds)
ctx, cancel := context.WithTimeout(context.Background(), time.Second)
defer cancel()
initialPeerSetupResponse, err := eqe.peer.peerClient.SyncQkdBulk(ctx, &pbIC.SyncQkdBulkRequest{
Timestamp: time.Now().Unix(),
InterComAddr: eqe.peer.interComAddr,
BulkId: rawBulkKeyIds,
})
if err != nil {
return err
}
bulkKey, ok := eqe.rawBulkKeys[initialPeerSetupResponse.BulkId]
if !ok {
// TODO: add proper error message
return fmt.Errorf("Could not find raw bulk key with id: %d", initialPeerSetupResponse.BulkId)
}
// TODO: Initially the peer partners should discuss about the key length,
// for now it is hardcoded.
eqe.keyStore = NewKmsKeyStore(256)
if err := eqe.KeyChopper(bulkKey); err != nil {
return err
}
eqe.rawBulkKeysMutex.Lock()
delete(eqe.rawBulkKeys, initialPeerSetupResponse.BulkId)
eqe.rawBulkKeysMutex.Unlock()
// update the peer status to up
eqe.peer.peerStatus = KmsPeerUp
// Send notification about change
if eqe.peer.externalNotifierKMSPeer != nil {
eqe.peer.externalNotifierKMSPeer <- eqe.peer.tcpSocketStr
}
return nil
}
func (eqe *EmulatedQuantumModule) Peer() *kmsPeer {
return eqe.peer
}
func (eqe *EmulatedQuantumModule) SetPeer(peer *kmsPeer) {
eqe.peer = peer
}
func (eqe *EmulatedQuantumModule) keyHandler() {
// periodically walk through quantum element and retrieve the key bulk buffer
for {
log.Debugf("%s: KeyHandler reading...\n", eqe.ID())
bulkKeys, err := eqe.QuantumElementLink.GetKeyBulkPeer()
if err != nil {
log.Errorf("%s: failed to retrieve bulkkeys with error %s", eqe.ID(), err)
} else {
// Add to the slice, but not process yet.
log.Debugf("%s: produced %d bytes of key", eqe.ID(), bulkKeys.BulkKeyLength)
eqe.rawBulkKeysMutex.Lock()
eqe.rawBulkKeys[bulkKeys.BulkKeyId] = &bulkKeys
eqe.rawBulkKeysMutex.Unlock()
}
// TODO: hardcoded
time.Sleep(5 * time.Second)
}
}
// Takes a bulk of keys and chops them in chopFactor keys each
// Any remainder is discarded
func (eqe *EmulatedQuantumModule) KeyChopper(bulkKey *quantumlayer.QuantumLayerBulkKey) error {
if eqe.keyStore.keySingleSize == 0 {
return errors.New("KeyChopper: no keySingleSize set")
}
// TODO check if multiple of 8 (1 Byte)
if bulkKey.BulkKeyLength != len(*bulkKey.BulkKey) {
return errors.New("bulkKey length mismatch")
}
// reset indexCounter
eqe.keyStore.indexCounter = 0
var keyId uint64
keyId = 0
// Let's chop!
chopFactor := eqe.keyStore.keySingleSize >> 3
key := *bulkKey.BulkKey
for len(key) > int(chopFactor) {
tmpkey := key[:chopFactor]
eqe.keyStore.addKey(keyId, tmpkey)
keyId++
// shorten the key storage
key = key[chopFactor:]
}
return nil
}
type ETSI014HTTPQuantumModule struct {
id uuid.UUID
keyStore *kmsKeyStore
peer *kmsPeer
}