github.com/sberex/go-sberex@v1.8.2-0.20181113200658-ed96ac38f7d7/cmd/ethkey/generate.go (about)

     1  // This file is part of the go-sberex library. The go-sberex library is 
     2  // free software: you can redistribute it and/or modify it under the terms 
     3  // of the GNU Lesser General Public License as published by the Free 
     4  // Software Foundation, either version 3 of the License, or (at your option)
     5  // any later version.
     6  //
     7  // The go-sberex library is distributed in the hope that it will be useful, 
     8  // but WITHOUT ANY WARRANTY; without even the implied warranty of
     9  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser 
    10  // General Public License <http://www.gnu.org/licenses/> for more details.
    11  
    12  package main
    13  
    14  import (
    15  	"crypto/ecdsa"
    16  	"fmt"
    17  	"io/ioutil"
    18  	"os"
    19  	"path/filepath"
    20  
    21  	"github.com/Sberex/go-sberex/accounts/keystore"
    22  	"github.com/Sberex/go-sberex/cmd/utils"
    23  	"github.com/Sberex/go-sberex/crypto"
    24  	"github.com/pborman/uuid"
    25  	"gopkg.in/urfave/cli.v1"
    26  )
    27  
    28  type outputGenerate struct {
    29  	Address      string
    30  	AddressEIP55 string
    31  }
    32  
    33  var commandGenerate = cli.Command{
    34  	Name:      "generate",
    35  	Usage:     "generate new keyfile",
    36  	ArgsUsage: "[ <keyfile> ]",
    37  	Description: `
    38  Generate a new keyfile.
    39  
    40  If you want to encrypt an existing private key, it can be specified by setting
    41  --privatekey with the location of the file containing the private key.
    42  `,
    43  	Flags: []cli.Flag{
    44  		passphraseFlag,
    45  		jsonFlag,
    46  		cli.StringFlag{
    47  			Name:  "privatekey",
    48  			Usage: "file containing a raw private key to encrypt",
    49  		},
    50  	},
    51  	Action: func(ctx *cli.Context) error {
    52  		// Check if keyfile path given and make sure it doesn't already exist.
    53  		keyfilepath := ctx.Args().First()
    54  		if keyfilepath == "" {
    55  			keyfilepath = defaultKeyfileName
    56  		}
    57  		if _, err := os.Stat(keyfilepath); err == nil {
    58  			utils.Fatalf("Keyfile already exists at %s.", keyfilepath)
    59  		} else if !os.IsNotExist(err) {
    60  			utils.Fatalf("Error checking if keyfile exists: %v", err)
    61  		}
    62  
    63  		var privateKey *ecdsa.PrivateKey
    64  		var err error
    65  		if file := ctx.String("privatekey"); file != "" {
    66  			// Load private key from file.
    67  			privateKey, err = crypto.LoadECDSA(file)
    68  			if err != nil {
    69  				utils.Fatalf("Can't load private key: %v", err)
    70  			}
    71  		} else {
    72  			// If not loaded, generate random.
    73  			privateKey, err = crypto.GenerateKey()
    74  			if err != nil {
    75  				utils.Fatalf("Failed to generate random private key: %v", err)
    76  			}
    77  		}
    78  
    79  		// Create the keyfile object with a random UUID.
    80  		id := uuid.NewRandom()
    81  		key := &keystore.Key{
    82  			Id:         id,
    83  			Address:    crypto.PubkeyToAddress(privateKey.PublicKey),
    84  			PrivateKey: privateKey,
    85  		}
    86  
    87  		// Encrypt key with passphrase.
    88  		passphrase := getPassPhrase(ctx, true)
    89  		keyjson, err := keystore.EncryptKey(key, passphrase, keystore.StandardScryptN, keystore.StandardScryptP)
    90  		if err != nil {
    91  			utils.Fatalf("Error encrypting key: %v", err)
    92  		}
    93  
    94  		// Store the file to disk.
    95  		if err := os.MkdirAll(filepath.Dir(keyfilepath), 0700); err != nil {
    96  			utils.Fatalf("Could not create directory %s", filepath.Dir(keyfilepath))
    97  		}
    98  		if err := ioutil.WriteFile(keyfilepath, keyjson, 0600); err != nil {
    99  			utils.Fatalf("Failed to write keyfile to %s: %v", keyfilepath, err)
   100  		}
   101  
   102  		// Output some information.
   103  		out := outputGenerate{
   104  			Address: key.Address.Hex(),
   105  		}
   106  		if ctx.Bool(jsonFlag.Name) {
   107  			mustPrintJSON(out)
   108  		} else {
   109  			fmt.Println("Address:", out.Address)
   110  		}
   111  		return nil
   112  	},
   113  }