diff --git a/crypto/src/math/raw/Nat512.cs b/crypto/src/math/raw/Nat512.cs
new file mode 100644
index 000000000..a9ef2b3b6
--- /dev/null
+++ b/crypto/src/math/raw/Nat512.cs
@@ -0,0 +1,46 @@
+using System;
+using System.Diagnostics;
+
+namespace Org.BouncyCastle.Math.Raw
+{
+ internal abstract class Nat512
+ {
+ public static void Mul(uint[] x, uint[] y, uint[] zz)
+ {
+ Nat256.Mul(x, y, zz);
+ Nat256.Mul(x, 8, y, 8, zz, 16);
+
+ uint c24 = Nat256.AddToEachOther(zz, 8, zz, 16);
+ uint c16 = c24 + Nat256.AddTo(zz, 0, zz, 8, 0);
+ c24 += Nat256.AddTo(zz, 24, zz, 16, c16);
+
+ uint[] dx = Nat256.Create(), dy = Nat256.Create();
+ bool neg = Nat256.Diff(x, 8, x, 0, dx, 0) != Nat256.Diff(y, 8, y, 0, dy, 0);
+
+ uint[] tt = Nat256.CreateExt();
+ Nat256.Mul(dx, dy, tt);
+
+ c24 += neg ? Nat.AddTo(16, tt, 0, zz, 8) : (uint)Nat.SubFrom(16, tt, 0, zz, 8);
+ Nat.AddWordAt(32, c24, zz, 24);
+ }
+
+ public static void Square(uint[] x, uint[] zz)
+ {
+ Nat256.Square(x, zz);
+ Nat256.Square(x, 8, zz, 16);
+
+ uint c24 = Nat256.AddToEachOther(zz, 8, zz, 16);
+ uint c16 = c24 + Nat256.AddTo(zz, 0, zz, 8, 0);
+ c24 += Nat256.AddTo(zz, 24, zz, 16, c16);
+
+ uint[] dx = Nat256.Create();
+ Nat256.Diff(x, 8, x, 0, dx, 0);
+
+ uint[] m = Nat256.CreateExt();
+ Nat256.Square(dx, m);
+
+ c24 += (uint)Nat.SubFrom(16, m, 0, zz, 8);
+ Nat.AddWordAt(32, c24, zz, 24);
+ }
+ }
+}
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