Monorepo scaffolding (#16)

* Change scaffolding

* Fix gh action

noah/init.go

@@ -0,0 +1,90 @@
+package main
+
+import (
+	"encoding/hex"
+	"fmt"
+
+	"github.com/btcsuite/btcd/btcec/v2"
+	"github.com/decred/dcrd/dcrec/secp256k1/v4"
+	"github.com/urfave/cli/v2"
+)
+
+var (
+	passwordFlag = cli.StringFlag{
+		Name:     "password",
+		Usage:    "password to encrypt private key",
+		Value:    "",
+		Required: true,
+	}
+
+	privateKeyFlag = cli.StringFlag{
+		Name:     "prvkey",
+		Usage:    "optional, private key to encrypt",
+		Value:    "",
+		Required: false,
+	}
+)
+
+var initCommand = cli.Command{
+	Name:   "init",
+	Usage:  "Initialize Noah wallet private key, encrypted with password",
+	Action: initAction,
+	Flags: []cli.Flag{
+		&passwordFlag,
+		&privateKeyFlag,
+	},
+}
+
+func initAction(ctx *cli.Context) error {
+	privateKeyString := ctx.String("prvkey")
+	password := ctx.String("password")
+
+	if len(password) <= 0 {
+		return fmt.Errorf("missing password flag (--password)")
+	}
+
+	var privateKey *secp256k1.PrivateKey
+
+	if len(privateKeyString) <= 0 {
+		privKey, err := generateRandomPrivateKey()
+		if err != nil {
+			return err
+		}
+		privateKey = privKey
+	} else {
+		privKeyBytes, err := hex.DecodeString(privateKeyString)
+		if err != nil {
+			return err
+		}
+
+		privateKey = secp256k1.PrivKeyFromBytes(privKeyBytes)
+	}
+
+	cypher := NewAES128Cypher()
+
+	encryptedPrivateKey, err := cypher.Encrypt(privateKey.Serialize(), []byte(password))
+	if err != nil {
+		return err
+	}
+
+	passwordHash := hashPassword([]byte(password))
+
+	state := map[string]string{
+		"encrypted_private_key": hex.EncodeToString(encryptedPrivateKey),
+		"password_hash":         hex.EncodeToString(passwordHash),
+	}
+
+	if err := setState(state); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func generateRandomPrivateKey() (*secp256k1.PrivateKey, error) {
+	privKey, err := btcec.NewPrivateKey()
+	if err != nil {
+		return nil, err
+	}
+	return privKey, nil
+}