From e3d37099daa4ff9e97f104bef02fcb74ea776a41 Mon Sep 17 00:00:00 2001
From: themighty1 <you@example.com>
Date: Sat, 16 Apr 2022 07:39:29 +0300
Subject: [PATCH] fix endianess

---
 mpc-core/src/utils.rs | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/mpc-core/src/utils.rs b/mpc-core/src/utils.rs
index 53d200c6e..9562391d3 100644
--- a/mpc-core/src/utils.rs
+++ b/mpc-core/src/utils.rs
@@ -5,7 +5,7 @@ pub fn boolvec_to_u8vec(bv: &[bool]) -> Vec<u8> {
     let offset = if bv.len() % 8 == 0 { 0 } else { 1 };
     let mut v = vec![0u8; bv.len() / 8 + offset];
     for (i, b) in bv.iter().enumerate() {
-        v[i / 8] |= (*b as u8) << (i % 8);
+        v[i / 8] |= (*b as u8) << (7 - (i % 8));
     }
     v
 }
@@ -15,7 +15,7 @@ pub fn u8vec_to_boolvec(v: &[u8]) -> Vec<bool> {
     let mut bv = Vec::with_capacity(v.len() * 8);
     for byte in v.iter() {
         for i in 0..8 {
-            bv.push((1 << i) & byte != 0);
+            bv.push(((byte >> (7 - i)) & 1) != 0);
         }
     }
     bv
@@ -84,6 +84,10 @@ mod tests {
 
     #[test]
     fn test_boolvec_to_u8vec() {
+        let mut u = vec![false; 16];
+        u[7] = true;
+        assert_eq!(boolvec_to_u8vec(&u), &256u16.to_be_bytes());
+
         let v = (0..128)
             .map(|_| rand::random::<bool>())
             .collect::<Vec<bool>>();
@@ -94,6 +98,10 @@ mod tests {
 
     #[test]
     fn test_u8vec_to_boolvec() {
+        let mut u = vec![false; 16];
+        u[7] = true;
+        assert_eq!(u8vec_to_boolvec(&256u16.to_be_bytes()), u);
+
         let v = (0..128).map(|_| rand::random::<u8>()).collect::<Vec<u8>>();
         let v_ = u8vec_to_boolvec(&v);
         let v__ = boolvec_to_u8vec(&v_);