using Org.BouncyCastle.Utilities; using System; using System.IO; namespace Org.BouncyCastle.Tls { public sealed class UrlAndHash { private readonly string m_url; private readonly byte[] m_sha1Hash; public string Url => m_url; public byte[] Sha1Hash => m_sha1Hash; public UrlAndHash(string url, byte[] sha1Hash) { if (TlsUtilities.IsNullOrEmpty(url) || url.Length >= 65536) throw new ArgumentException("must have length from 1 to (2^16 - 1)", "url"); if (sha1Hash != null && sha1Hash.Length != 20) throw new ArgumentException("must have length == 20, if present", "sha1Hash"); m_url = url; m_sha1Hash = sha1Hash; } public void Encode(Stream output) { TlsUtilities.WriteOpaque16(Strings.ToByteArray(m_url), output); if (m_sha1Hash == null) TlsUtilities.WriteUint8(0, output); else { TlsUtilities.WriteUint8(1, output); output.Write(m_sha1Hash, 0, m_sha1Hash.Length); } } public static UrlAndHash Parse(TlsContext context, Stream input) { string url = Strings.FromByteArray(TlsUtilities.ReadOpaque16(input, 1)); byte[] sha1Hash = null; switch (TlsUtilities.ReadUint8(input)) { case 0: if (TlsUtilities.IsTlsV12(context)) throw new TlsFatalAlert(47); break; case 1: sha1Hash = TlsUtilities.ReadFully(20, input); break; default: throw new TlsFatalAlert(47); } return new UrlAndHash(url, sha1Hash); } } }