System.Security.Cryptography.X509Certificates.X509KeyUsageExtension.CopyFrom C# (CSharp) Method

        public override void CopyFrom(System.Security.Cryptography.AsnEncodedData asnEncodedData)
        {
        }

 public bool CheckSignature(X509Certificate2 certificate, bool verifySignatureOnly)
 {
     if (!this.CheckSignature(certificate.PublicKey.Key))
     {
         return false;
     }
     if (verifySignatureOnly)
     {
         SignedXmlDebugLog.LogVerificationResult(this, certificate, true);
         return true;
     }
     X509ExtensionEnumerator enumerator = certificate.Extensions.GetEnumerator();
     while (enumerator.MoveNext())
     {
         X509Extension current = enumerator.Current;
         if (string.Compare(current.Oid.Value, "2.5.29.15", StringComparison.OrdinalIgnoreCase) == 0)
         {
             X509KeyUsageExtension keyUsages = new X509KeyUsageExtension();
             keyUsages.CopyFrom(current);
             SignedXmlDebugLog.LogVerifyKeyUsage(this, certificate, keyUsages);
             if (((keyUsages.KeyUsages & X509KeyUsageFlags.DigitalSignature) != X509KeyUsageFlags.None) || ((keyUsages.KeyUsages & X509KeyUsageFlags.NonRepudiation) != X509KeyUsageFlags.None))
             {
                 break;
             }
             SignedXmlDebugLog.LogVerificationFailure(this, SecurityResources.GetResourceString("Log_VerificationFailed_X509KeyUsage"));
             return false;
         }
     }
     X509Chain chain = new X509Chain();
     chain.ChainPolicy.ExtraStore.AddRange(this.BuildBagOfCerts());
     bool flag2 = chain.Build(certificate);
     SignedXmlDebugLog.LogVerifyX509Chain(this, chain, certificate);
     if (!flag2)
     {
         SignedXmlDebugLog.LogVerificationFailure(this, SecurityResources.GetResourceString("Log_VerificationFailed_X509Chain"));
         return false;
     }
     SignedXmlDebugLog.LogVerificationResult(this, certificate, true);
     return true;
 }