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);
+}