code: func NewSecretKey(pub, sec *[32]byte) SecretKey {
  	return SecretKey{
  		sec: saltpack.RawBoxKey(*sec),
  		pub: PublicKey{
  			RawBoxKey: *pub,
  		},
  	}
  }
docs: // NewSecretKey makes a new SecretKey from the raw 32-byte arrays
  // the represent Box public and secret keys.