package main

import (
	"crypto/ed25519"
	"fmt"

	"git.sigsum.org/sigsum-go/pkg/hex"
	"git.sigsum.org/sigsum-go/pkg/types"
)

func CmdHashKey() error {
	b, err := decodeHexFromStdin()
	if err != nil {
		return err
	}
	if len(b) != ed25519.PublicKeySize {
		return fmt.Errorf("invalid private key: size")
	}
	pub := ed25519.PublicKey(b)
	keyHash := types.HashFn(pub)

	fmt.Printf("%s\n", hex.Serialize(keyHash[:]))
	return nil
}