github.com/ethw3/go-ethereuma@v0.0.0-20221013053120-c14602a4c23c/cmd/ethkey/message.go (about)

     1  // Copyright 2017 The go-ethereum Authors
     2  // This file is part of go-ethereum.
     3  //
     4  // go-ethereum is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // go-ethereum is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU General Public License
    15  // along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package main
    18  
    19  import (
    20  	"encoding/hex"
    21  	"fmt"
    22  	"os"
    23  
    24  	"github.com/ethw3/go-ethereuma/accounts"
    25  	"github.com/ethw3/go-ethereuma/accounts/keystore"
    26  	"github.com/ethw3/go-ethereuma/cmd/utils"
    27  	"github.com/ethw3/go-ethereuma/common"
    28  	"github.com/ethw3/go-ethereuma/crypto"
    29  	"github.com/urfave/cli/v2"
    30  )
    31  
    32  type outputSign struct {
    33  	Signature string
    34  }
    35  
    36  var msgfileFlag = &cli.StringFlag{
    37  	Name:  "msgfile",
    38  	Usage: "file containing the message to sign/verify",
    39  }
    40  
    41  var commandSignMessage = &cli.Command{
    42  	Name:      "signmessage",
    43  	Usage:     "sign a message",
    44  	ArgsUsage: "<keyfile> <message>",
    45  	Description: `
    46  Sign the message with a keyfile.
    47  
    48  To sign a message contained in a file, use the --msgfile flag.
    49  `,
    50  	Flags: []cli.Flag{
    51  		passphraseFlag,
    52  		jsonFlag,
    53  		msgfileFlag,
    54  	},
    55  	Action: func(ctx *cli.Context) error {
    56  		message := getMessage(ctx, 1)
    57  
    58  		// Load the keyfile.
    59  		keyfilepath := ctx.Args().First()
    60  		keyjson, err := os.ReadFile(keyfilepath)
    61  		if err != nil {
    62  			utils.Fatalf("Failed to read the keyfile at '%s': %v", keyfilepath, err)
    63  		}
    64  
    65  		// Decrypt key with passphrase.
    66  		passphrase := getPassphrase(ctx, false)
    67  		key, err := keystore.DecryptKey(keyjson, passphrase)
    68  		if err != nil {
    69  			utils.Fatalf("Error decrypting key: %v", err)
    70  		}
    71  
    72  		signature, err := crypto.Sign(accounts.TextHash(message), key.PrivateKey)
    73  		if err != nil {
    74  			utils.Fatalf("Failed to sign message: %v", err)
    75  		}
    76  		out := outputSign{Signature: hex.EncodeToString(signature)}
    77  		if ctx.Bool(jsonFlag.Name) {
    78  			mustPrintJSON(out)
    79  		} else {
    80  			fmt.Println("Signature:", out.Signature)
    81  		}
    82  		return nil
    83  	},
    84  }
    85  
    86  type outputVerify struct {
    87  	Success            bool
    88  	RecoveredAddress   string
    89  	RecoveredPublicKey string
    90  }
    91  
    92  var commandVerifyMessage = &cli.Command{
    93  	Name:      "verifymessage",
    94  	Usage:     "verify the signature of a signed message",
    95  	ArgsUsage: "<address> <signature> <message>",
    96  	Description: `
    97  Verify the signature of the message.
    98  It is possible to refer to a file containing the message.`,
    99  	Flags: []cli.Flag{
   100  		jsonFlag,
   101  		msgfileFlag,
   102  	},
   103  	Action: func(ctx *cli.Context) error {
   104  		addressStr := ctx.Args().First()
   105  		signatureHex := ctx.Args().Get(1)
   106  		message := getMessage(ctx, 2)
   107  
   108  		if !common.IsHexAddress(addressStr) {
   109  			utils.Fatalf("Invalid address: %s", addressStr)
   110  		}
   111  		address := common.HexToAddress(addressStr)
   112  		signature, err := hex.DecodeString(signatureHex)
   113  		if err != nil {
   114  			utils.Fatalf("Signature encoding is not hexadecimal: %v", err)
   115  		}
   116  
   117  		recoveredPubkey, err := crypto.SigToPub(accounts.TextHash(message), signature)
   118  		if err != nil || recoveredPubkey == nil {
   119  			utils.Fatalf("Signature verification failed: %v", err)
   120  		}
   121  		recoveredPubkeyBytes := crypto.FromECDSAPub(recoveredPubkey)
   122  		recoveredAddress := crypto.PubkeyToAddress(*recoveredPubkey)
   123  		success := address == recoveredAddress
   124  
   125  		out := outputVerify{
   126  			Success:            success,
   127  			RecoveredPublicKey: hex.EncodeToString(recoveredPubkeyBytes),
   128  			RecoveredAddress:   recoveredAddress.Hex(),
   129  		}
   130  		if ctx.Bool(jsonFlag.Name) {
   131  			mustPrintJSON(out)
   132  		} else {
   133  			if out.Success {
   134  				fmt.Println("Signature verification successful!")
   135  			} else {
   136  				fmt.Println("Signature verification failed!")
   137  			}
   138  			fmt.Println("Recovered public key:", out.RecoveredPublicKey)
   139  			fmt.Println("Recovered address:", out.RecoveredAddress)
   140  		}
   141  		return nil
   142  	},
   143  }
   144  
   145  func getMessage(ctx *cli.Context, msgarg int) []byte {
   146  	if file := ctx.String(msgfileFlag.Name); file != "" {
   147  		if ctx.NArg() > msgarg {
   148  			utils.Fatalf("Can't use --msgfile and message argument at the same time.")
   149  		}
   150  		msg, err := os.ReadFile(file)
   151  		if err != nil {
   152  			utils.Fatalf("Can't read message file: %v", err)
   153  		}
   154  		return msg
   155  	} else if ctx.NArg() == msgarg+1 {
   156  		return []byte(ctx.Args().Get(msgarg))
   157  	}
   158  	utils.Fatalf("Invalid number of arguments: want %d, got %d", msgarg+1, ctx.NArg())
   159  	return nil
   160  }