accounts/scwallet: fix staticcheck warnings (#20370)

accounts/scwallet/securechannel.go

@@ -71,7 +71,7 @@ func NewSecureChannelSession(card *pcsc.Card, keyData []byte) (*SecureChannelSes
 
 	cardPublic, ok := gen.Unmarshal(keyData)
 	if !ok {
-		return nil, fmt.Errorf("Could not unmarshal public key from card")
+		return nil, fmt.Errorf("could not unmarshal public key from card")
 	}
 
 	secret, err := gen.GenerateSharedSecret(private, cardPublic)
@@ -109,7 +109,7 @@ func (s *SecureChannelSession) Pair(pairingPassword []byte) error {
 	cardChallenge := response.Data[32:64]
 
 	if !bytes.Equal(expectedCryptogram, cardCryptogram) {
-		return fmt.Errorf("Invalid card cryptogram %v != %v", expectedCryptogram, cardCryptogram)
+		return fmt.Errorf("invalid card cryptogram %v != %v", expectedCryptogram, cardCryptogram)
 	}
 
 	md.Reset()
@@ -132,7 +132,7 @@ func (s *SecureChannelSession) Pair(pairingPassword []byte) error {
 // Unpair disestablishes an existing pairing.
 func (s *SecureChannelSession) Unpair() error {
 	if s.PairingKey == nil {
-		return fmt.Errorf("Cannot unpair: not paired")
+		return fmt.Errorf("cannot unpair: not paired")
 	}
 
 	_, err := s.transmitEncrypted(claSCWallet, insUnpair, s.PairingIndex, 0, []byte{})
@@ -148,7 +148,7 @@ func (s *SecureChannelSession) Unpair() error {
 // Open initializes the secure channel.
 func (s *SecureChannelSession) Open() error {
 	if s.iv != nil {
-		return fmt.Errorf("Session already opened")
+		return fmt.Errorf("session already opened")
 	}
 
 	response, err := s.open()
@@ -185,11 +185,11 @@ func (s *SecureChannelSession) mutuallyAuthenticate() error {
 		return err
 	}
 	if response.Sw1 != 0x90 || response.Sw2 != 0x00 {
-		return fmt.Errorf("Got unexpected response from MUTUALLY_AUTHENTICATE: 0x%x%x", response.Sw1, response.Sw2)
+		return fmt.Errorf("got unexpected response from MUTUALLY_AUTHENTICATE: 0x%x%x", response.Sw1, response.Sw2)
 	}
 
 	if len(response.Data) != scSecretLength {
-		return fmt.Errorf("Response from MUTUALLY_AUTHENTICATE was %d bytes, expected %d", len(response.Data), scSecretLength)
+		return fmt.Errorf("response from MUTUALLY_AUTHENTICATE was %d bytes, expected %d", len(response.Data), scSecretLength)
 	}
 
 	return nil
@@ -222,7 +222,7 @@ func (s *SecureChannelSession) pair(p1 uint8, data []byte) (*responseAPDU, error
 // transmitEncrypted sends an encrypted message, and decrypts and returns the response.
 func (s *SecureChannelSession) transmitEncrypted(cla, ins, p1, p2 byte, data []byte) (*responseAPDU, error) {
 	if s.iv == nil {
-		return nil, fmt.Errorf("Channel not open")
+		return nil, fmt.Errorf("channel not open")
 	}
 
 	data, err := s.encryptAPDU(data)
@@ -261,14 +261,14 @@ func (s *SecureChannelSession) transmitEncrypted(cla, ins, p1, p2 byte, data []b
 		return nil, err
 	}
 	if !bytes.Equal(s.iv, rmac) {
-		return nil, fmt.Errorf("Invalid MAC in response")
+		return nil, fmt.Errorf("invalid MAC in response")
 	}
 
 	rapdu := &responseAPDU{}
 	rapdu.deserialize(plainData)
 
 	if rapdu.Sw1 != sw1Ok {
-		return nil, fmt.Errorf("Unexpected response status Cla=0x%x, Ins=0x%x, Sw=0x%x%x", cla, ins, rapdu.Sw1, rapdu.Sw2)
+		return nil, fmt.Errorf("unexpected response status Cla=0x%x, Ins=0x%x, Sw=0x%x%x", cla, ins, rapdu.Sw1, rapdu.Sw2)
 	}
 
 	return rapdu, nil
@@ -277,7 +277,7 @@ func (s *SecureChannelSession) transmitEncrypted(cla, ins, p1, p2 byte, data []b
 // encryptAPDU is an internal method that serializes and encrypts an APDU.
 func (s *SecureChannelSession) encryptAPDU(data []byte) ([]byte, error) {
 	if len(data) > maxPayloadSize {
-		return nil, fmt.Errorf("Payload of %d bytes exceeds maximum of %d", len(data), maxPayloadSize)
+		return nil, fmt.Errorf("payload of %d bytes exceeds maximum of %d", len(data), maxPayloadSize)
 	}
 	data = pad(data, 0x80)
 
@@ -323,10 +323,10 @@ func unpad(data []byte, terminator byte) ([]byte, error) {
 		case terminator:
 			return data[:len(data)-i], nil
 		default:
-			return nil, fmt.Errorf("Expected end of padding, got %d", data[len(data)-i])
+			return nil, fmt.Errorf("expected end of padding, got %d", data[len(data)-i])
 		}
 	}
-	return nil, fmt.Errorf("Expected end of padding, got 0")
+	return nil, fmt.Errorf("expected end of padding, got 0")
 }
 
 // updateIV is an internal method that updates the initialization vector after

accounts/scwallet/wallet.go

@@ -167,7 +167,7 @@ func transmit(card *pcsc.Card, command *commandAPDU) (*responseAPDU, error) {
 	}
 
 	if response.Sw1 != sw1Ok {
-		return nil, fmt.Errorf("Unexpected insecure response status Cla=0x%x, Ins=0x%x, Sw=0x%x%x", command.Cla, command.Ins, response.Sw1, response.Sw2)
+		return nil, fmt.Errorf("unexpected insecure response status Cla=0x%x, Ins=0x%x, Sw=0x%x%x", command.Cla, command.Ins, response.Sw1, response.Sw2)
 	}
 
 	return response, nil
@@ -252,7 +252,7 @@ func (w *Wallet) release() error {
 // with the wallet.
 func (w *Wallet) pair(puk []byte) error {
 	if w.session.paired() {
-		return fmt.Errorf("Wallet already paired")
+		return fmt.Errorf("wallet already paired")
 	}
 	pairing, err := w.session.pair(puk)
 	if err != nil {
@@ -773,12 +773,12 @@ func (w *Wallet) findAccountPath(account accounts.Account) (accounts.DerivationP
 
 	// Look for the path in the URL
 	if account.URL.Scheme != w.Hub.scheme {
-		return nil, fmt.Errorf("Scheme %s does not match wallet scheme %s", account.URL.Scheme, w.Hub.scheme)
+		return nil, fmt.Errorf("scheme %s does not match wallet scheme %s", account.URL.Scheme, w.Hub.scheme)
 	}
 
 	parts := strings.SplitN(account.URL.Path, "/", 2)
 	if len(parts) != 2 {
-		return nil, fmt.Errorf("Invalid URL format: %s", account.URL)
+		return nil, fmt.Errorf("invalid URL format: %s", account.URL)
 	}
 
 	if parts[0] != fmt.Sprintf("%x", w.PublicKey[1:3]) {
@@ -813,7 +813,7 @@ func (s *Session) pair(secret []byte) (smartcardPairing, error) {
 // unpair deletes an existing pairing.
 func (s *Session) unpair() error {
 	if !s.verified {
-		return fmt.Errorf("Unpair requires that the PIN be verified")
+		return fmt.Errorf("unpair requires that the PIN be verified")
 	}
 	return s.Channel.Unpair()
 }
@@ -850,7 +850,7 @@ func (s *Session) paired() bool {
 // authenticate uses an existing pairing to establish a secure channel.
 func (s *Session) authenticate(pairing smartcardPairing) error {
 	if !bytes.Equal(s.Wallet.PublicKey, pairing.PublicKey) {
-		return fmt.Errorf("Cannot pair using another wallet's pairing; %x != %x", s.Wallet.PublicKey, pairing.PublicKey)
+		return fmt.Errorf("cannot pair using another wallet's pairing; %x != %x", s.Wallet.PublicKey, pairing.PublicKey)
 	}
 	s.Channel.PairingKey = pairing.PairingKey
 	s.Channel.PairingIndex = pairing.PairingIndex
@@ -879,6 +879,7 @@ func (s *Session) walletStatus() (*walletStatus, error) {
 }
 
 // derivationPath fetches the wallet's current derivation path from the card.
+//lint:ignore U1000 needs to be added to the console interface
 func (s *Session) derivationPath() (accounts.DerivationPath, error) {
 	response, err := s.Channel.transmitEncrypted(claSCWallet, insStatus, statusP1Path, 0, nil)
 	if err != nil {
@@ -993,12 +994,14 @@ func (s *Session) derive(path accounts.DerivationPath) (accounts.Account, error)
 }
 
 // keyExport contains information on an exported keypair.
+//lint:ignore U1000 needs to be added to the console interface
 type keyExport struct {
 	PublicKey  []byte `asn1:"tag:0"`
 	PrivateKey []byte `asn1:"tag:1,optional"`
 }
 
 // publicKey returns the public key for the current derivation path.
+//lint:ignore U1000 needs to be added to the console interface
 func (s *Session) publicKey() ([]byte, error) {
 	response, err := s.Channel.transmitEncrypted(claSCWallet, insExportKey, exportP1Any, exportP2Pubkey, nil)
 	if err != nil {