add MCL_VINT_FIXED_BUFFER

include/mcl/vint.hpp

@@ -1794,8 +1794,11 @@ public:
 };
 
 //typedef VintT<vint::VariableBuffer<mcl::vint::Unit> > Vint;
-//typedef VintT<vint::FixedBuffer<mcl::vint::Unit, 10> > Vint;
+#ifdef MCL_VINT_FIXED_BUFFER
+typedef VintT<vint::FixedBuffer<mcl::vint::Unit, MCL_MAX_BIT_SIZE * 2> > Vint;
+#else
 typedef VintT<vint::Buffer<mcl::vint::Unit> > Vint;
+#endif
 
 } // mcl
 

src/fp.cpp

@@ -390,7 +390,7 @@ static void initForMont(Op& op, const Unit *p, Mode mode)
 		R = (t << (N * UnitBitSize)) % op.mp;
 		t = (R * R) % op.mp;
 		gmp::getArray(op.R2, N, t);
-		t = (R * R * R) % op.mp;
+		t = (t * R) % op.mp;
 		gmp::getArray(op.R3, N, t);
 	}
 	op.rp = getMontgomeryCoeff(p[0]);