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Ensure that R and S are not gte curve order #7

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Ensure that R and S are not gte curve order #7

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4 changes: 4 additions & 0 deletions LaksaCsharp/Crypto/Schnorr.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -135,6 +135,10 @@ public static bool Verify(byte[] msg, Signature sig, ECPoint publicKey)
throw new Exception("Invalid R or S value: cannot be negative.");
}

if (sig.R.CompareTo(secp256k1.Curve.Order) >= 0 || sig.S.CompareTo(secp256k1.Curve.Order) >= 0) {
throw new Exception("Invalid R or S value: must be smaller than curve order");
}

if (publicKey.Curve != (secp256k1.Curve))
{
throw new Exception("The public key must be a point on secp256k1.");
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