open-consul/command/keygen.go

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package command
import (
"crypto/rand"
"encoding/base64"
"fmt"
"strings"
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"github.com/hashicorp/consul/command/base"
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)
// KeygenCommand is a Command implementation that generates an encryption
// key for use in `consul agent`.
type KeygenCommand struct {
base.Command
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}
func (c *KeygenCommand) Run(args []string) int {
c.Command.NewFlagSet(c)
if err := c.Command.Parse(args); err != nil {
return 1
}
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key := make([]byte, 16)
n, err := rand.Reader.Read(key)
if err != nil {
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c.UI.Error(fmt.Sprintf("Error reading random data: %s", err))
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return 1
}
if n != 16 {
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c.UI.Error(fmt.Sprintf("Couldn't read enough entropy. Generate more entropy!"))
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return 1
}
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c.UI.Output(base64.StdEncoding.EncodeToString(key))
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return 0
}
func (c *KeygenCommand) Synopsis() string {
return "Generates a new encryption key"
}
func (c *KeygenCommand) Help() string {
helpText := `
Usage: consul keygen
Generates a new encryption key that can be used to configure the
agent to encrypt traffic. The output of this command is already
in the proper format that the agent expects.
` + c.Command.Help()
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return strings.TrimSpace(helpText)
}