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package main
import (
"crypto/ecdsa"
"crypto/rand"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"github.com/ethereum/go-ethereum/accounts/keystore"
"github.com/ethereum/go-ethereum/cmd/utils"
"github.com/ethereum/go-ethereum/crypto"
"github.com/pborman/uuid"
"gopkg.in/urfave/cli.v1"
)
type outputGenerate struct {
Address string
AddressEIP55 string
}
var commandGenerate = cli.Command{
Name: "generate",
Usage: "generate new keyfile",
ArgsUsage: "[ <keyfile> ]",
Description: `
Generate a new keyfile.
If you want to use an existing private key to use in the keyfile, it can be
specified by setting --privatekey with the location of the file containing the
private key.`,
Flags: []cli.Flag{
passphraseFlag,
jsonFlag,
cli.StringFlag{
Name: "privatekey",
Usage: "the file from where to read the private key to " +
"generate a keyfile for",
},
},
Action: func(ctx *cli.Context) error {
// Check if keyfile path given and make sure it doesn't already exist.
keyfilepath := ctx.Args().First()
if keyfilepath == "" {
keyfilepath = defaultKeyfileName
}
if _, err := os.Stat(keyfilepath); err == nil {
utils.Fatalf("Keyfile already exists at %s.", keyfilepath)
} else if !os.IsNotExist(err) {
utils.Fatalf("Error checking if keyfile exists: %v", err)
}
var privateKey *ecdsa.PrivateKey
// First check if a private key file is provided.
privateKeyFile := ctx.String("privatekey")
if privateKeyFile != "" {
privateKeyBytes, err := ioutil.ReadFile(privateKeyFile)
if err != nil {
utils.Fatalf("Failed to read the private key file '%s': %v",
privateKeyFile, err)
}
pk, err := crypto.HexToECDSA(string(privateKeyBytes))
if err != nil {
utils.Fatalf(
"Could not construct ECDSA private key from file content: %v",
err)
}
privateKey = pk
}
// If not loaded, generate random.
if privateKey == nil {
pk, err := ecdsa.GenerateKey(crypto.S256(), rand.Reader)
if err != nil {
utils.Fatalf("Failed to generate random private key: %v", err)
}
privateKey = pk
}
// Create the keyfile object with a random UUID.
id := uuid.NewRandom()
key := &keystore.Key{
Id: id,
Address: crypto.PubkeyToAddress(privateKey.PublicKey),
PrivateKey: privateKey,
}
// Encrypt key with passphrase.
passphrase := getPassPhrase(ctx, true)
keyjson, err := keystore.EncryptKey(key, passphrase,
keystore.StandardScryptN, keystore.StandardScryptP)
if err != nil {
utils.Fatalf("Error encrypting key: %v", err)
}
// Store the file to disk.
if err := os.MkdirAll(filepath.Dir(keyfilepath), 0700); err != nil {
utils.Fatalf("Could not create directory %s", filepath.Dir(keyfilepath))
}
if err := ioutil.WriteFile(keyfilepath, keyjson, 0600); err != nil {
utils.Fatalf("Failed to write keyfile to %s: %v", keyfilepath, err)
}
// Output some information.
out := outputGenerate{
Address: key.Address.Hex(),
}
if ctx.Bool(jsonFlag.Name) {
mustPrintJSON(out)
} else {
fmt.Println("Address: ", out.Address)
}
return nil
},
}
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