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path: root/crypto/src/math/ec/custom/sec/SecT409FieldElement.cs
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Diffstat (limited to 'crypto/src/math/ec/custom/sec/SecT409FieldElement.cs')
-rw-r--r--crypto/src/math/ec/custom/sec/SecT409FieldElement.cs2
1 files changed, 1 insertions, 1 deletions
diff --git a/crypto/src/math/ec/custom/sec/SecT409FieldElement.cs b/crypto/src/math/ec/custom/sec/SecT409FieldElement.cs
index 6dabf6a7a..b60ceafee 100644
--- a/crypto/src/math/ec/custom/sec/SecT409FieldElement.cs
+++ b/crypto/src/math/ec/custom/sec/SecT409FieldElement.cs
@@ -12,7 +12,7 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec
 
         public SecT409FieldElement(BigInteger x)
         {
-            if (x == null || x.SignValue < 0)
+            if (x == null || x.SignValue < 0 || x.BitLength > 409)
                 throw new ArgumentException("value invalid for SecT409FieldElement", "x");
 
             this.x = SecT409Field.FromBigInteger(x);