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// Copyright 2017 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
package main
import (
"encoding/hex"
"fmt"
"io/ioutil"
"github.com/tangerine-network/go-tangerine/accounts/keystore"
"github.com/tangerine-network/go-tangerine/cmd/utils"
"github.com/tangerine-network/go-tangerine/common"
"github.com/tangerine-network/go-tangerine/crypto"
"gopkg.in/urfave/cli.v1"
)
type outputSign struct {
Signature string
}
var msgfileFlag = cli.StringFlag{
Name: "msgfile",
Usage: "file containing the message to sign/verify",
}
var commandSignMessage = cli.Command{
Name: "signmessage",
Usage: "sign a message",
ArgsUsage: "<keyfile> <message>",
Description: `
Sign the message with a keyfile.
To sign a message contained in a file, use the --msgfile flag.
`,
Flags: []cli.Flag{
passphraseFlag,
jsonFlag,
msgfileFlag,
},
Action: func(ctx *cli.Context) error {
message := getMessage(ctx, 1)
// Load the keyfile.
keyfilepath := ctx.Args().First()
keyjson, err := ioutil.ReadFile(keyfilepath)
if err != nil {
utils.Fatalf("Failed to read the keyfile at '%s': %v", keyfilepath, err)
}
// Decrypt key with passphrase.
passphrase := getPassphrase(ctx)
key, err := keystore.DecryptKey(keyjson, passphrase)
if err != nil {
utils.Fatalf("Error decrypting key: %v", err)
}
signature, err := crypto.Sign(signHash(message), key.PrivateKey)
if err != nil {
utils.Fatalf("Failed to sign message: %v", err)
}
out := outputSign{Signature: hex.EncodeToString(signature)}
if ctx.Bool(jsonFlag.Name) {
mustPrintJSON(out)
} else {
fmt.Println("Signature:", out.Signature)
}
return nil
},
}
type outputVerify struct {
Success bool
RecoveredAddress string
RecoveredPublicKey string
}
var commandVerifyMessage = cli.Command{
Name: "verifymessage",
Usage: "verify the signature of a signed message",
ArgsUsage: "<address> <signature> <message>",
Description: `
Verify the signature of the message.
It is possible to refer to a file containing the message.`,
Flags: []cli.Flag{
jsonFlag,
msgfileFlag,
},
Action: func(ctx *cli.Context) error {
addressStr := ctx.Args().First()
signatureHex := ctx.Args().Get(1)
message := getMessage(ctx, 2)
if !common.IsHexAddress(addressStr) {
utils.Fatalf("Invalid address: %s", addressStr)
}
address := common.HexToAddress(addressStr)
signature, err := hex.DecodeString(signatureHex)
if err != nil {
utils.Fatalf("Signature encoding is not hexadecimal: %v", err)
}
recoveredPubkey, err := crypto.SigToPub(signHash(message), signature)
if err != nil || recoveredPubkey == nil {
utils.Fatalf("Signature verification failed: %v", err)
}
recoveredPubkeyBytes := crypto.FromECDSAPub(recoveredPubkey)
recoveredAddress := crypto.PubkeyToAddress(*recoveredPubkey)
success := address == recoveredAddress
out := outputVerify{
Success: success,
RecoveredPublicKey: hex.EncodeToString(recoveredPubkeyBytes),
RecoveredAddress: recoveredAddress.Hex(),
}
if ctx.Bool(jsonFlag.Name) {
mustPrintJSON(out)
} else {
if out.Success {
fmt.Println("Signature verification successful!")
} else {
fmt.Println("Signature verification failed!")
}
fmt.Println("Recovered public key:", out.RecoveredPublicKey)
fmt.Println("Recovered address:", out.RecoveredAddress)
}
return nil
},
}
func getMessage(ctx *cli.Context, msgarg int) []byte {
if file := ctx.String("msgfile"); file != "" {
if len(ctx.Args()) > msgarg {
utils.Fatalf("Can't use --msgfile and message argument at the same time.")
}
msg, err := ioutil.ReadFile(file)
if err != nil {
utils.Fatalf("Can't read message file: %v", err)
}
return msg
} else if len(ctx.Args()) == msgarg+1 {
return []byte(ctx.Args().Get(msgarg))
}
utils.Fatalf("Invalid number of arguments: want %d, got %d", msgarg+1, len(ctx.Args()))
return nil
}
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