Serialization
This document explains how to serialize and deserialize ciphertexts and secret keys when working with TFHE-rs in Rust.
Concrete already has its serilization functions (e.g. tfhers_bridge.export_value
, tfhers_bridge.import_value
, tfhers_bridge.keygen_with_initial_keys
, tfhers_bridge.serialize_input_secret_key
). However, when implementing a TFHE-rs computation in Rust, we must use a compatible serialization.
Ciphertexts
We can deserialize FheUint8
(and similarly other types) using bincode
use tfhe::FheUint8;
/// ...
fn load_fheuint8(path: &String) -> FheUint8 {
let path_fheuint: &Path = Path::new(path);
let serialized_fheuint = fs::read(path_fheuint).unwrap();
let mut serialized_data = Cursor::new(serialized_fheuint);
bincode::deserialize_from(&mut serialized_data).unwrap()
}
To serialize
fn save_fheuint8(fheuint: FheUint8, path: &String) {
let mut serialized_ct = Vec::new();
bincode::serialize_into(&mut serialized_ct, &fheuint).unwrap();
let path_ct: &Path = Path::new(path);
fs::write(path_ct, serialized_ct).unwrap();
}
Secret Key
We can deserialize LweSecretKey
using bincode
use tfhe::core_crypto::prelude::LweSecretKey;
/// ...
fn load_lwe_sk(path: &String) -> LweSecretKey<Vec<u64>> {
let path_sk: &Path = Path::new(path);
let serialized_lwe_key = fs::read(path_sk).unwrap();
let mut serialized_data = Cursor::new(serialized_lwe_key);
bincode::deserialize_from(&mut serialized_data).unwrap()
}
To serialize
fn save_lwe_sk(lwe_sk: LweSecretKey<Vec<u64>>, path: &String) {
let mut serialized_lwe_key = Vec::new();
bincode::serialize_into(&mut serialized_lwe_key, &lwe_sk).unwrap();
let path_sk: &Path = Path::new(path);
fs::write(path_sk, serialized_lwe_key).unwrap();
}
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