pub fn ipfe_keygen(
msk: &IpfeMasterSecretKey,
func_vector: &[i64],
) -> FunctionalEncryptionResult<IpfeFunctionalKey>pub fn ipfe_keygen(
msk: &IpfeMasterSecretKey,
func_vector: &[i64],
) -> FunctionalEncryptionResult<IpfeFunctionalKey>