LowGear with higher statistical security.

guoqx2 · Apr 16, 2021 · 6c89808 · 6c89808
1 parent 8c9a743
commit 6c89808
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/Math/fixint.h b/Math/fixint.h
@@ -11,6 +11,8 @@
 template<int L>
 class fixint : public SignedZ2<64 * (L + 1)>
 {
+    static const int OVERFLOW = 60;
+
 public:
     typedef SignedZ2<64 * (L + 1)> super;
 
@@ -22,7 +24,7 @@ class fixint : public SignedZ2<64 * (L + 1)>
     fixint(const T& other) :
             super(other)
     {
-        char check = this->a[this->N_WORDS - 1] >> 56;
+        auto check = mp_limb_signed_t(this->a[this->N_WORDS - 1]) >> OVERFLOW;
         assert(check == 0 or check == -1);
     }
 
@@ -68,7 +70,7 @@ class fixint : public SignedZ2<64 * (L + 1)>
     void allocate_slots(const T& limit)
     {
         int n_bits = this->size_in_bits();
-        if (numBits(limit) - 56 > n_bits)
+        if (numBits(limit) - OVERFLOW > n_bits)
         {
         cerr << "cannot hold " << numBits(limit) << " bits, " << n_bits
                 << " available" << endl;