dump validator privkey for kms

dump_privval_key.go

package main

import (
	"fmt"
	"io/ioutil"

	"github.com/tendermint/tendermint/crypto/ed25519"
	"github.com/tendermint/tendermint/privval"
)

func main() {
	keyFile := "/Users/ismail/.tendermint/config/priv_validator_key.json"
	stateFile := "/Users/ismail/.tendermint/data/priv_validator_state.json"
	fpv := privval.LoadFilePV(keyFile, stateFile)
	pkb := [64]byte(fpv.Key.PrivKey.(ed25519.PrivKeyEd25519))
	err := ioutil.WriteFile("/tmp/signing2.key", pkb[:32], 0644)
	if err != nil {
		fmt.Println("Duh!!", err)
	}
}