1 files changed, 12 insertions, 0 deletions
diff --git a/crypto/src/math/ec/custom/sec/SecP224R1Field.cs b/crypto/src/math/ec/custom/sec/SecP224R1Field.cs
index 51d9020b6..559593c66 100644
--- a/crypto/src/math/ec/custom/sec/SecP224R1Field.cs
+++ b/crypto/src/math/ec/custom/sec/SecP224R1Field.cs
@@ -74,6 +74,18 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec
             Reduce(tt, z);
         }
 
+        public static void MultiplyAddToExt(uint[] x, uint[] y, uint[] zz)
+        {
+            uint c = Nat224.MulAddTo(x, y, zz);
+            if (c != 0 || (zz[13] == PExt13 && Nat.Gte(14, zz, PExt)))
+            {
+                if (Nat.AddTo(PExtInv.Length, PExtInv, zz) != 0)
+                {
+                    Nat.IncAt(14, zz, PExtInv.Length);
+                }
+            }
+        }
+
         public static void Negate(uint[] x, uint[] z)
         {
             if (Nat224.IsZero(x))