add mnemonic generation

.gitignore

@@ -1,3 +1,4 @@
+.vscode
 /keycard
 /build
 /status-keycard-go

examples/example-go/main.go

@@ -48,6 +48,9 @@ func signalHandler(j []byte) {
 		case skg.EnterNewPair:
 			fmt.Printf("Creating pairing: %+v\n", correctPairing)
 			flow.Resume(skg.FlowParams{skg.NewPairing: correctPairing})
+		case skg.EnterMnemonic:
+			fmt.Printf("Loading mnemonic\n")
+			flow.Resume(skg.FlowParams{skg.Mnemonic: "receive fan copper bracket end train again sustain wet siren throw cigar"})
 		case skg.FlowResult:
 			fmt.Printf("Flow result: %+v\n", sig.Event)
 			close(finished)
@@ -98,7 +101,7 @@ func main() {
 	signal.SetKeycardSignalHandler(signalHandler)
 
 	testFlow(skg.GetAppInfo, skg.FlowParams{skg.FactoryReset: true})
-	testFlow(skg.LoadAccount, skg.FlowParams{skg.Mnemonic: "receive fan copper bracket end train again sustain wet siren throw cigar"})
+	testFlow(skg.LoadAccount, skg.FlowParams{skg.MnemonicLen: 12})
 	testFlow(skg.UnpairThis, skg.FlowParams{skg.PIN: correctPIN})
 	testFlow(skg.RecoverAccount, skg.FlowParams{skg.PairingPass: "WrongPass", skg.PIN: "234567"})
 	testFlow(skg.Login, skg.FlowParams{skg.KeyUID: "60a78c98d5dd659f714eb7072bfb2c0d8a65f74a8f6aff7bb27cf56ae1feec17"})

flow.go

@@ -105,9 +105,7 @@ func (f *KeycardFlow) runFlow() {
 	f.state = Idle
 }
 
-func (f *KeycardFlow) pause(action string, errMsg string) {
-	status := FlowParams{}
-
+func (f *KeycardFlow) pause(action string, errMsg string, status FlowParams) {
 	status[ErrorKey] = errMsg
 
 	if f.cardInfo.freeSlots != -1 {
@@ -125,12 +123,12 @@ func (f *KeycardFlow) pause(action string, errMsg string) {
 	f.state = Paused
 }
 
-func (f *KeycardFlow) pauseAndWait(action string, errMsg string) error {
+func (f *KeycardFlow) pauseAndWaitWithStatus(action string, errMsg string, status FlowParams) error {
 	if f.state == Cancelling {
 		return giveupErr()
 	}
 
-	f.pause(action, errMsg)
+	f.pause(action, errMsg, status)
 	<-f.wakeUp
 
 	if f.state == Resuming {
@@ -141,6 +139,10 @@ func (f *KeycardFlow) pauseAndWait(action string, errMsg string) error {
 	}
 }
 
+func (f *KeycardFlow) pauseAndWait(action string, errMsg string) error {
+	return f.pauseAndWaitWithStatus(action, errMsg, FlowParams{})
+}
+
 func (f *KeycardFlow) pauseAndRestart(action string, errMsg string) error {
 	err := f.pauseAndWait(action, errMsg)
 
@@ -184,7 +186,7 @@ func (f *KeycardFlow) connect() *keycardContext {
 		return nil
 	}
 
-	f.pause(InsertCard, ErrorConnection)
+	f.pause(InsertCard, ErrorConnection, FlowParams{})
 	select {
 	case <-f.wakeUp:
 		if f.state != Cancelling {

flow_commands.go

@@ -311,7 +311,20 @@ func (f *KeycardFlow) loadKeys(kc *keycardContext) error {
 		return nil
 	}
 
-	err := f.pauseAndWait(EnterMnemonic, ErrorLoading)
+	mnemonicLength, ok := f.params[MnemonicLen]
+	if !ok {
+		mnemonicLength = defMnemoLen
+	}
+
+	indexes, err := kc.generateMnemonic(mnemonicLength.(int) / 3)
+
+	if isSCardError(err) {
+		return restartErr()
+	} else if err != nil {
+		return err
+	}
+
+	err = f.pauseAndWaitWithStatus(EnterMnemonic, ErrorLoading, FlowParams{MnemonicIdxs: indexes})
 
 	if err != nil {
 		return err

flow_types.go

@@ -105,6 +105,8 @@ const (
 	EncKey       = "encryption-key"
 	ExportedKey  = "exported-key"
 	Mnemonic     = "mnemonic"
+	MnemonicLen  = "mnemonic-length"
+	MnemonicIdxs = "mnemonic-indexes"
 	TXHash       = "tx-hash"
 	BIP44Path    = "bip44-path"
 	TXSignature  = "tx-signature"
@@ -115,6 +117,7 @@ const (
 	maxPINRetries = 3
 	maxPUKRetries = 5
 	maxFreeSlots  = 5
+	defMnemoLen   = 12
 )
 
 const (

keycard_context.go

@@ -237,6 +237,7 @@ func (kc *keycardContext) unblockPIN(puk string, newPIN string) error {
 	return nil
 }
 
+//lint:ignore U1000 will be used
 func (kc *keycardContext) generateKey() ([]byte, error) {
 	<-kc.connected
 	if kc.runErr != nil {
@@ -293,6 +294,7 @@ func (kc *keycardContext) removeKey() error {
 	return nil
 }
 
+//lint:ignore U1000 will be used
 func (kc *keycardContext) deriveKey(path string) error {
 	<-kc.connected
 	if kc.runErr != nil {