mirror of https://github.com/ethereum/go-ethereum
cmd/ethkey: add command to change key passphrase (#16516)
This change introduces ethkey changepassphrase <keyfile> to change the passphrase of a key file.pull/16912/merge
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ea06da0892
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package main |
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import ( |
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"fmt" |
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"io/ioutil" |
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"strings" |
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"github.com/ethereum/go-ethereum/accounts/keystore" |
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"github.com/ethereum/go-ethereum/cmd/utils" |
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"gopkg.in/urfave/cli.v1" |
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) |
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var newPassphraseFlag = cli.StringFlag{ |
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Name: "newpasswordfile", |
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Usage: "the file that contains the new passphrase for the keyfile", |
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} |
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var commandChangePassphrase = cli.Command{ |
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Name: "changepassphrase", |
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Usage: "change the passphrase on a keyfile", |
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ArgsUsage: "<keyfile>", |
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Description: ` |
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Change the passphrase of a keyfile.`, |
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Flags: []cli.Flag{ |
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passphraseFlag, |
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newPassphraseFlag, |
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}, |
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Action: func(ctx *cli.Context) error { |
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keyfilepath := ctx.Args().First() |
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// Read key from file.
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keyjson, err := ioutil.ReadFile(keyfilepath) |
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if err != nil { |
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utils.Fatalf("Failed to read the keyfile at '%s': %v", keyfilepath, err) |
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} |
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// Decrypt key with passphrase.
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passphrase := getPassphrase(ctx) |
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key, err := keystore.DecryptKey(keyjson, passphrase) |
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if err != nil { |
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utils.Fatalf("Error decrypting key: %v", err) |
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} |
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// Get a new passphrase.
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fmt.Println("Please provide a new passphrase") |
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var newPhrase string |
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if passFile := ctx.String(newPassphraseFlag.Name); passFile != "" { |
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content, err := ioutil.ReadFile(passFile) |
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if err != nil { |
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utils.Fatalf("Failed to read new passphrase file '%s': %v", passFile, err) |
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} |
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newPhrase = strings.TrimRight(string(content), "\r\n") |
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} else { |
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newPhrase = promptPassphrase(true) |
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} |
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// Encrypt the key with the new passphrase.
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newJson, err := keystore.EncryptKey(key, newPhrase, keystore.StandardScryptN, keystore.StandardScryptP) |
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if err != nil { |
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utils.Fatalf("Error encrypting with new passphrase: %v", err) |
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} |
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// Then write the new keyfile in place of the old one.
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if err := ioutil.WriteFile(keyfilepath, newJson, 600); err != nil { |
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utils.Fatalf("Error writing new keyfile to disk: %v", err) |
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} |
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// Don't print anything. Just return successfully,
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// producing a positive exit code.
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return nil |
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}, |
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} |
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