diff --git a/crypto/src/math/ec/custom/sec/SecP256K1Field.cs b/crypto/src/math/ec/custom/sec/SecP256K1Field.cs
index ec2c36e9f..527360cf6 100644
--- a/crypto/src/math/ec/custom/sec/SecP256K1Field.cs
+++ b/crypto/src/math/ec/custom/sec/SecP256K1Field.cs
@@ -112,6 +112,21 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec
Reduce(tt, z);
}
+ public static void SquareN(uint[] x, int n, uint[] z)
+ {
+ Debug.Assert(n > 0);
+
+ uint[] tt = Nat256.CreateExt();
+ Nat256.Square(x, tt);
+ Reduce(tt, z);
+
+ while (--n > 0)
+ {
+ Nat256.Square(z, tt);
+ Reduce(tt, z);
+ }
+ }
+
public static void Subtract(uint[] x, uint[] y, uint[] z)
{
int c = Nat256.Sub(x, y, z);
diff --git a/crypto/src/math/ec/custom/sec/SecP256R1Field.cs b/crypto/src/math/ec/custom/sec/SecP256R1Field.cs
index baea02dd0..cb9874bfd 100644
--- a/crypto/src/math/ec/custom/sec/SecP256R1Field.cs
+++ b/crypto/src/math/ec/custom/sec/SecP256R1Field.cs
@@ -145,6 +145,21 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec
Reduce(tt, z);
}
+ public static void SquareN(uint[] x, int n, uint[] z)
+ {
+ Debug.Assert(n > 0);
+
+ uint[] tt = Nat256.CreateExt();
+ Nat256.Square(x, tt);
+ Reduce(tt, z);
+
+ while (--n > 0)
+ {
+ Nat256.Square(z, tt);
+ Reduce(tt, z);
+ }
+ }
+
public static void Subtract(uint[] x, uint[] y, uint[] z)
{
int c = Nat256.Sub(x, y, z);
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