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-rw-r--r--cmd/ethkey/utils.go83
1 files changed, 83 insertions, 0 deletions
diff --git a/cmd/ethkey/utils.go b/cmd/ethkey/utils.go
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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/json"
+ "fmt"
+ "io/ioutil"
+ "strings"
+
+ "github.com/ethereum/go-ethereum/cmd/utils"
+ "github.com/ethereum/go-ethereum/console"
+ "github.com/ethereum/go-ethereum/crypto"
+ "gopkg.in/urfave/cli.v1"
+)
+
+// getPassPhrase obtains a passphrase given by the user. It first checks the
+// --passphrase command line flag and ultimately prompts the user for a
+// passphrase.
+func getPassPhrase(ctx *cli.Context, confirmation bool) string {
+ // Look for the --passphrase flag.
+ passphraseFile := ctx.String(passphraseFlag.Name)
+ if passphraseFile != "" {
+ content, err := ioutil.ReadFile(passphraseFile)
+ if err != nil {
+ utils.Fatalf("Failed to read passphrase file '%s': %v",
+ passphraseFile, err)
+ }
+ return strings.TrimRight(string(content), "\r\n")
+ }
+
+ // Otherwise prompt the user for the passphrase.
+ passphrase, err := console.Stdin.PromptPassword("Passphrase: ")
+ if err != nil {
+ utils.Fatalf("Failed to read passphrase: %v", err)
+ }
+ if confirmation {
+ confirm, err := console.Stdin.PromptPassword("Repeat passphrase: ")
+ if err != nil {
+ utils.Fatalf("Failed to read passphrase confirmation: %v", err)
+ }
+ if passphrase != confirm {
+ utils.Fatalf("Passphrases do not match")
+ }
+ }
+ return passphrase
+}
+
+// signHash is a helper function that calculates a hash for the given message
+// that can be safely used to calculate a signature from.
+//
+// The hash is calulcated as
+// keccak256("\x19Ethereum Signed Message:\n"${message length}${message}).
+//
+// This gives context to the signed message and prevents signing of transactions.
+func signHash(data []byte) []byte {
+ msg := fmt.Sprintf("\x19Ethereum Signed Message:\n%d%s", len(data), data)
+ return crypto.Keccak256([]byte(msg))
+}
+
+// mustPrintJSON prints the JSON encoding of the given object and
+// exits the program with an error message when the marshaling fails.
+func mustPrintJSON(jsonObject interface{}) {
+ str, err := json.MarshalIndent(jsonObject, "", " ")
+ if err != nil {
+ utils.Fatalf("Failed to marshal JSON object: %v", err)
+ }
+ fmt.Println(string(str))
+}