Org.BouncyCastle.Asn1.DerApplicationSpecific.GetLengthOfHeader C# (CSharp) Méthode

		private int GetLengthOfHeader(
			byte[] data)
		{
            int length = data[1]; // TODO: assumes 1 byte tag

            if (length == 0x80)
            {
                return 2;      // indefinite-length encoding
            }

            if (length > 127)
            {
                int size = length & 0x7f;

                // Note: The invalid long form "0xff" (see X.690 8.1.3.5c) will be caught here
                if (size > 4)
                {
                    throw new InvalidOperationException("DER length more than 4 bytes: " + size);
                }

                return size + 2;
            }

            return 2;
        }