code: func (s *PrivateAccountAPI) ImportRawKey(privkey string, password string) (common.Address, error) {
  	key, err := crypto.HexToECDSA(privkey)
  	if err != nil {
  		return common.Address{}, err
  	}
  	acc, err := fetchKeystore(s.am).ImportECDSA(key, password)
  	return acc.Address, err
  }
docs: // ImportRawKey stores the given hex encoded ECDSA key into the key directory,
  // encrypting it with the passphrase.