1 files changed, 18 insertions, 0 deletions
diff --git a/crypto/src/math/ec/multiplier/AbstractECMultiplier.cs b/crypto/src/math/ec/multiplier/AbstractECMultiplier.cs
new file mode 100644
index 000000000..fe683726f
--- /dev/null
+++ b/crypto/src/math/ec/multiplier/AbstractECMultiplier.cs
@@ -0,0 +1,18 @@
+namespace Org.BouncyCastle.Math.EC.Multiplier
+{
+    public abstract class AbstractECMultiplier
+        : ECMultiplier
+    {
+        public virtual ECPoint Multiply(ECPoint p, BigInteger k)
+        {
+            int sign = k.SignValue;
+            if (sign == 0 || p.IsInfinity)
+                return p.Curve.Infinity;
+
+            ECPoint positive = MultiplyPositive(p, k.Abs());
+            return sign > 0 ? positive : positive.Negate();
+        }
+
+        protected abstract ECPoint MultiplyPositive(ECPoint p, BigInteger k);
+    }
+}