1 files changed, 11 insertions, 0 deletions
diff --git a/crypto/src/math/ec/ECCurve.cs b/crypto/src/math/ec/ECCurve.cs
index fa2c72570..6ccd97e7b 100644
--- a/crypto/src/math/ec/ECCurve.cs
+++ b/crypto/src/math/ec/ECCurve.cs
@@ -96,6 +96,7 @@ namespace Org.BouncyCastle.Math.EC
public abstract int FieldSize { get; }
public abstract ECFieldElement FromBigInteger(BigInteger x);
+ public abstract bool IsValidFieldElement(BigInteger x);
public virtual Config Configure()
{
@@ -477,6 +478,11 @@ namespace Org.BouncyCastle.Math.EC
{
}
+ public override bool IsValidFieldElement(BigInteger x)
+ {
+ return x != null && x.SignValue >= 0 && x.CompareTo(Field.Characteristic) < 0;
+ }
+
protected override ECPoint DecompressPoint(int yTilde, BigInteger X1)
{
ECFieldElement x = FromBigInteger(X1);
@@ -670,6 +676,11 @@ namespace Org.BouncyCastle.Math.EC
{
}
+ public override bool IsValidFieldElement(BigInteger x)
+ {
+ return x != null && x.SignValue >= 0 && x.BitLength <= FieldSize;
+ }
+
[Obsolete("Per-point compression property will be removed")]
public override ECPoint CreatePoint(BigInteger x, BigInteger y, bool withCompression)
{
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