/// <summary>
/// Check whether a signature is normalized (lower-S).
/// </summary>
/// <param name="vchSig"></param>
/// <returns></returns>
public static bool CheckLowS(ReadOnlySequence<byte> vchSig)
{
var sig = new byte[64];
var input = vchSig.ToSpan();
using (var secp256k1 = new Secp256k1()) {
if (!secp256k1.SignatureParseDerLax(sig, input)) return false;
return !secp256k1.SignatureNormalize(Span<byte>.Empty, input);
}
}
/// <summary>
/// Check whether a signature is normalized (lower-S).
/// </summary>
/// <param name="vchSig"></param>
/// <returns></returns>
public static bool CheckLowS(ReadOnlyByteSequence vchSig)
{
var sig = new byte[64];
var input = (ReadOnlyByteSpan)vchSig;
using var library = new Secp256k1();
if (!library.SignatureParseDerLax(sig, input))
{
return(false);
}
return(!library.SignatureNormalize(Span <byte> .Empty, input));
}