Add ed25519, tests will fail until ed25519 verification fix

ledger_secp256k1.go

@@ -0,0 +1,158 @@
+package crypto
+
+import (
+	"fmt"
+	"github.com/pkg/errors"
+
+	secp256k1 "github.com/btcsuite/btcd/btcec"
+	ledger "github.com/zondax/ledger-goclient"
+)
+
+func pubkeyLedgerSecp256k1(device *ledger.Ledger, path DerivationPath) (pub PubKey, err error) {
+	key, err := device.GetPublicKeySECP256K1(path)
+	if err != nil {
+		return pub, fmt.Errorf("Error fetching public key: %v", err)
+	}
+	var p PubKeySecp256k1
+	// Reserialize in the 33-byte compressed format
+	cmp, err := secp256k1.ParsePubKey(key[:], secp256k1.S256())
+	copy(p[:], cmp.SerializeCompressed())
+	return p, err
+}
+
+func signLedgerSecp256k1(device *ledger.Ledger, path DerivationPath, msg []byte) (sig Signature, err error) {
+	bsig, err := device.SignSECP256K1(path, msg)
+	if err != nil {
+		return sig, err
+	}
+	sig = SignatureSecp256k1FromBytes(bsig)
+	return sig, nil
+}
+
+// PrivKeyLedgerSecp256k1 implements PrivKey, calling the ledger nano
+// we cache the PubKey from the first call to use it later
+type PrivKeyLedgerSecp256k1 struct {
+	// PubKey should be private, but we want to encode it via go-amino
+	// so we can view the address later, even without having the ledger
+	// attached
+	CachedPubKey PubKey
+	Path         DerivationPath
+}
+
+// NewPrivKeyLedgerSecp256k1 will generate a new key and store the
+// public key for later use.
+func NewPrivKeyLedgerSecp256k1(path DerivationPath) (PrivKey, error) {
+	var pk PrivKeyLedgerSecp256k1
+	pk.Path = path
+	// getPubKey will cache the pubkey for later use,
+	// this allows us to return an error early if the ledger
+	// is not plugged in
+	_, err := pk.getPubKey()
+	return &pk, err
+}
+
+// ValidateKey allows us to verify the sanity of a key
+// after loading it from disk
+func (pk PrivKeyLedgerSecp256k1) ValidateKey() error {
+	// getPubKey will return an error if the ledger is not
+	// properly set up...
+	pub, err := pk.forceGetPubKey()
+	if err != nil {
+		return err
+	}
+	// verify this matches cached address
+	if !pub.Equals(pk.CachedPubKey) {
+		return errors.New("Cached key does not match retrieved key")
+	}
+	return nil
+}
+
+// AssertIsPrivKeyInner fulfils PrivKey Interface
+func (pk *PrivKeyLedgerSecp256k1) AssertIsPrivKeyInner() {}
+
+// Bytes fulfils PrivKey Interface - but it stores the cached pubkey so we can verify
+// the same key when we reconnect to a ledger
+func (pk PrivKeyLedgerSecp256k1) Bytes() []byte {
+	bin, err := cdc.MarshalBinaryBare(pk)
+	if err != nil {
+		panic(err)
+	}
+	return bin
+}
+
+// Sign calls the ledger and stores the PubKey for future use
+//
+// XXX/TODO: panics if there is an error communicating with the ledger.
+//
+// Communication is checked on NewPrivKeyLedger and PrivKeyFromBytes,
+// returning an error, so this should only trigger if the privkey is held
+// in memory for a while before use.
+func (pk PrivKeyLedgerSecp256k1) Sign(msg []byte) Signature {
+	// oh, I wish there was better error handling
+	dev, err := getLedger()
+	if err != nil {
+		panic(err)
+	}
+
+	sig, err := signLedgerSecp256k1(dev, pk.Path, msg)
+	if err != nil {
+		panic(err)
+	}
+
+	pub, err := pubkeyLedgerSecp256k1(dev, pk.Path)
+	if err != nil {
+		panic(err)
+	}
+
+	// if we have no pubkey yet, store it for future queries
+	if pk.CachedPubKey == nil {
+		pk.CachedPubKey = pub
+	} else if !pk.CachedPubKey.Equals(pub) {
+		panic("Stored key does not match signing key")
+	}
+	return sig
+}
+
+// PubKey returns the stored PubKey
+// TODO: query the ledger if not there, once it is not volatile
+func (pk PrivKeyLedgerSecp256k1) PubKey() PubKey {
+	key, err := pk.getPubKey()
+	if err != nil {
+		panic(err)
+	}
+	return key
+}
+
+// getPubKey reads the pubkey from cache or from the ledger itself
+// since this involves IO, it may return an error, which is not exposed
+// in the PubKey interface, so this function allows better error handling
+func (pk PrivKeyLedgerSecp256k1) getPubKey() (key PubKey, err error) {
+	// if we have no pubkey, set it
+	if pk.CachedPubKey == nil {
+		pk.CachedPubKey, err = pk.forceGetPubKey()
+	}
+	return pk.CachedPubKey, err
+}
+
+// forceGetPubKey is like getPubKey but ignores any cached key
+// and ensures we get it from the ledger itself.
+func (pk PrivKeyLedgerSecp256k1) forceGetPubKey() (key PubKey, err error) {
+	dev, err := getLedger()
+	if err != nil {
+		return key, errors.New(fmt.Sprintf("Cannot connect to Ledger device - error: %v", err))
+	}
+	key, err = pubkeyLedgerSecp256k1(dev, pk.Path)
+	if err != nil {
+		return key, errors.New(fmt.Sprintf("Please open Cosmos app on the Ledger device - error: %v", err))
+	}
+	return key, err
+}
+
+// Equals fulfils PrivKey Interface - makes sure both keys refer to the
+// same
+func (pk PrivKeyLedgerSecp256k1) Equals(other PrivKey) bool {
+	if ledger, ok := other.(*PrivKeyLedgerSecp256k1); ok {
+		return pk.CachedPubKey.Equals(ledger.CachedPubKey)
+	}
+	return false
+}