add example

examples/fheuint8.rs

@@ -0,0 +1,71 @@
+use bin_rs::*;
+use itertools::Itertools;
+use rand::{thread_rng, RngCore};
+
+fn plain_circuit(a: u8, b: u8, c: u8) -> u8 {
+    (a + b) * c
+}
+
+fn fhe_circuit(fhe_a: &FheUint8, fhe_b: &FheUint8, fhe_c: &FheUint8) -> FheUint8 {
+    &(fhe_a + fhe_b) * fhe_c
+}
+
+fn main() {
+    set_parameter_set(ParameterSelector::MultiPartyLessThan16);
+    let no_of_parties = 2;
+    let client_keys = (0..no_of_parties)
+        .into_iter()
+        .map(|_| gen_client_key())
+        .collect_vec();
+
+    // set Multi-Party seed
+    let mut seed = [0u8; 32];
+    thread_rng().fill_bytes(&mut seed);
+    set_mp_seed(seed);
+
+    // multi-party key gen round 1
+    let pk_shares = client_keys
+        .iter()
+        .map(|k| gen_mp_keys_phase1(k))
+        .collect_vec();
+
+    // create public key
+    let public_key = aggregate_public_key_shares(&pk_shares);
+
+    // multi-party key gen round 2
+    let server_key_shares = client_keys
+        .iter()
+        .map(|k| gen_mp_keys_phase2(k, &public_key))
+        .collect_vec();
+
+    // server aggregates server key shares and sets it
+    let server_key = aggregate_server_key_shares(&server_key_shares);
+    server_key.set_server_key();
+
+    // private inputs
+    let a = 4u8;
+    let b = 6u8;
+    let c = 128u8;
+    let fhe_a = public_key.encrypt(&a);
+    let fhe_b = public_key.encrypt(&b);
+    let fhe_c = public_key.encrypt(&c);
+
+    // fhe evaluation
+    let now = std::time::Instant::now();
+    let fhe_out = fhe_circuit(&fhe_a, &fhe_b, &fhe_c);
+    println!("Circuit time: {:?}", now.elapsed());
+
+    // plain evaluation
+    let out = plain_circuit(a, b, c);
+
+    // generate decryption shares to decrypt ciphertext fhe_out
+    let decryption_shares = client_keys
+        .iter()
+        .map(|k| k.gen_decryption_share(&fhe_out))
+        .collect_vec();
+
+    // decrypt fhe_out using decryption shares
+    let got_out = client_keys[0].aggregate_decryption_shares(&fhe_out, &decryption_shares);
+
+    assert_eq!(got_out, out);
+}

src/bool/mod.rs

@@ -26,8 +26,16 @@ static BOOL_SERVER_KEY: OnceLock>>>
 
 static MULTI_PARTY_CRS: OnceLock<MultiPartyCrs<[u8; 32]>> = OnceLock::new();
 
-pub fn set_parameter_set(parameter: &BoolParameters<u64>) {
-    BOOL_EVALUATOR.with_borrow_mut(|v| *v = Some(BoolEvaluator::new(parameter.clone())));
+pub enum ParameterSelector {
+    MultiPartyLessThan16,
+}
+
+pub fn set_parameter_set(select: ParameterSelector) {
+    match select {
+        ParameterSelector::MultiPartyLessThan16 => {
+            BOOL_EVALUATOR.with_borrow_mut(|v| *v = Some(BoolEvaluator::new(SMALL_MP_BOOL_PARAMS)));
+        }
+    }
 }
 
 pub fn set_mp_seed(seed: [u8; 32]) {

src/bool/parameters.rs

@@ -3,7 +3,7 @@ use num_traits::{ConstZero, FromPrimitive, PrimInt};
 use crate::{backend::Modulus, decomposer::Decomposer};
 
 #[derive(Clone, PartialEq)]
-pub(crate) struct BoolParameters<El> {
+pub struct BoolParameters<El> {
     rlwe_q: CiphertextModulus<El>,
     lwe_q: CiphertextModulus<El>,
     br_q: usize,
@@ -181,7 +181,7 @@ pub(crate) struct PolynomialSize(pub(crate) usize);
 
 /// T equals modulus when modulus is non-native. Otherwise T equals 0. bool is
 /// true when modulus is native, false otherwise.
-pub(crate) struct CiphertextModulus<T>(T, bool);
+pub struct CiphertextModulus<T>(T, bool);
 
 impl<T: ConstZero> CiphertextModulus<T> {
     const fn new_native() -> Self {

src/lib.rs

@@ -23,8 +23,13 @@ mod utils;
 pub use backend::{
     ArithmeticLazyOps, ArithmeticOps, ModInit, ModularOpsU64, ShoupMatrixFMA, VectorOps,
 };
+pub use bool::{
+    aggregate_public_key_shares, aggregate_server_key_shares, gen_client_key, gen_mp_keys_phase1,
+    gen_mp_keys_phase2, set_mp_seed, set_parameter_set, ParameterSelector,
+};
 pub use decomposer::{Decomposer, DecomposerIter, DefaultDecomposer};
 pub use ntt::{Ntt, NttBackendU64, NttInit};
+pub use shortint::FheUint8;
 
 pub trait Matrix: AsRef<[Self::R]> {
     type MatElement;
@@ -165,15 +170,15 @@ impl RowEntity for Vec {
     }
 }
 
-trait Encryptor<M: ?Sized, C> {
+pub trait Encryptor<M: ?Sized, C> {
     fn encrypt(&self, m: &M) -> C;
 }
 
-trait Decryptor<M, C> {
+pub trait Decryptor<M, C> {
     fn decrypt(&self, c: &C) -> M;
 }
 
-trait MultiPartyDecryptor<M, C> {
+pub trait MultiPartyDecryptor<M, C> {
     type DecryptionShare;
 
     fn gen_decryption_share(&self, c: &C) -> Self::DecryptionShare;

src/random.rs

@@ -12,7 +12,7 @@ thread_local! {
     pub(crate) static DEFAULT_RNG: RefCell<DefaultSecureRng> = RefCell::new(DefaultSecureRng::new_seeded([0u8;32]));
 }
 
-pub(crate) trait NewWithSeed {
+pub trait NewWithSeed {
     type Seed;
     fn new_with_seed(seed: Self::Seed) -> Self;
 }
@@ -59,7 +59,7 @@ where
     fn random_fill(&mut self, modulus: &P, container: &mut M);
 }
 
-pub(crate) struct DefaultSecureRng {
+pub struct DefaultSecureRng {
     rng: ChaCha8Rng,
 }
 

src/shortint/mod.rs

@@ -8,7 +8,7 @@ use crate::{
 mod ops;
 mod types;
 
-type FheUint8 = types::FheUint8<Vec<u64>>;
+pub type FheUint8 = types::FheUint8<Vec<u64>>;
 
 impl Encryptor<u8, FheUint8> for ClientKey {
     fn encrypt(&self, m: &u8) -> FheUint8 {
@@ -308,9 +308,7 @@ mod tests {
     use crate::{
         bool::{
             aggregate_public_key_shares, aggregate_server_key_shares, gen_client_key, gen_keys,
-            gen_mp_keys_phase1, gen_mp_keys_phase2,
-            parameters::{MP_BOOL_PARAMS, SMALL_MP_BOOL_PARAMS, SP_BOOL_PARAMS},
-            set_mp_seed, set_parameter_set,
+            gen_mp_keys_phase1, gen_mp_keys_phase2, set_mp_seed, set_parameter_set,
         },
         shortint::types::FheUint8,
         Decryptor, Encryptor, MultiPartyDecryptor,
@@ -318,7 +316,7 @@ mod tests {
 
     #[test]
     fn all_uint8_apis() {
-        set_parameter_set(&SP_BOOL_PARAMS);
+        set_parameter_set(crate::ParameterSelector::MultiPartyLessThan16);
 
         let (ck, sk) = gen_keys();
         sk.set_server_key();
@@ -466,7 +464,7 @@ mod tests {
 
     #[test]
     fn fheuint8_test_multi_party() {
-        set_parameter_set(&SMALL_MP_BOOL_PARAMS);
+        set_parameter_set(crate::ParameterSelector::MultiPartyLessThan16);
         set_mp_seed([0; 32]);
 
         let parties = 8;

src/shortint/types.rs

@@ -1,5 +1,5 @@
 #[derive(Clone)]
-pub(super) struct FheUint8<C> {
+pub struct FheUint8<C> {
     pub(super) data: Vec<C>,
 }