Mono.Security.X509.X509ExtensionCollection.GetBytes C# (CSharp) Method

		public byte[] GetBytes () 
		{
			if (InnerList.Count < 1)
				return null;
			ASN1 sequence = new ASN1 (0x30);
			for (int i=0; i < InnerList.Count; i++) {
				X509Extension x = (X509Extension) InnerList [i];
				sequence.Add (x.ASN1);
			}
			return sequence.GetBytes ();
		}
	}

        protected override ASN1 ToBeSigned(string oid)
        {
            // TBSCertificate
            ASN1 tbsCert = new ASN1(0x30);

            if (version > 1)
            {
                // TBSCertificate / [0] Version DEFAULT v1,
                byte[] ver = { (byte)(version - 1) };
                ASN1   v   = tbsCert.Add(new ASN1(0xA0));
                v.Add(new ASN1(0x02, ver));
            }

            // TBSCertificate / CertificateSerialNumber,
            tbsCert.Add(new ASN1(0x02, sn));

            // TBSCertificate / AlgorithmIdentifier,
            tbsCert.Add(PKCS7.AlgorithmIdentifier(oid));

            // TBSCertificate / Name
            tbsCert.Add(X501.FromString(issuer));

            // TBSCertificate / Validity
            ASN1 validity = tbsCert.Add(new ASN1(0x30));

            // TBSCertificate / Validity / Time
            validity.Add(ASN1Convert.FromDateTime(notBefore));
            // TBSCertificate / Validity / Time
            validity.Add(ASN1Convert.FromDateTime(notAfter));

            // TBSCertificate / Name
            tbsCert.Add(X501.FromString(subject));

            // TBSCertificate / SubjectPublicKeyInfo
            tbsCert.Add(SubjectPublicKeyInfo());

            if (version > 1)
            {
                // TBSCertificate / [1]  IMPLICIT UniqueIdentifier OPTIONAL
                if (issuerUniqueID != null)
                {
                    tbsCert.Add(new ASN1(0xA1, UniqueIdentifier(issuerUniqueID)));
                }

                // TBSCertificate / [2]  IMPLICIT UniqueIdentifier OPTIONAL
                if (subjectUniqueID != null)
                {
                    tbsCert.Add(new ASN1(0xA1, UniqueIdentifier(subjectUniqueID)));
                }

                // TBSCertificate / [3]  Extensions OPTIONAL
                if ((version > 2) && (extensions.Count > 0))
                {
                    tbsCert.Add(new ASN1(0xA3, extensions.GetBytes()));
                }
            }

            return(tbsCert);
        }