1 files changed, 116 insertions, 0 deletions
diff --git a/crypto/src/tls/CertificateUrl.cs b/crypto/src/tls/CertificateUrl.cs
new file mode 100644
index 000000000..d2445772a
--- /dev/null
+++ b/crypto/src/tls/CertificateUrl.cs
@@ -0,0 +1,116 @@
+using System;
+using System.Collections;
+using System.IO;
+
+using Org.BouncyCastle.Utilities;
+using Org.BouncyCastle.Utilities.IO;
+
+namespace Org.BouncyCastle.Tls
+{
+    /// <summary>RFC 3546 3.3</summary>
+    public sealed class CertificateUrl
+    {
+        private readonly short m_type;
+        private readonly IList m_urlAndHashList;
+
+        /// <param name="type">see <see cref="CertChainType"/> for valid constants.</param>
+        /// <param name="urlAndHashList">an <see cref="IList"/> of <see cref="UrlAndHash"/>.</param>
+        public CertificateUrl(short type, IList urlAndHashList)
+        {
+            if (!CertChainType.IsValid(type))
+                throw new ArgumentException("not a valid CertChainType value", "type");
+            if (urlAndHashList == null || urlAndHashList.Count < 1)
+                throw new ArgumentException("must have length > 0", "urlAndHashList");
+            if (type == CertChainType.pkipath && urlAndHashList.Count != 1)
+                throw new ArgumentException("must contain exactly one entry when type is "
+                    + CertChainType.GetText(type), "urlAndHashList");
+
+            this.m_type = type;
+            this.m_urlAndHashList = urlAndHashList;
+        }
+
+        /// <returns><see cref="CertChainType"/></returns>
+        public short Type
+        {
+            get { return m_type; }
+        }
+
+        /// <returns>an <see cref="IList"/> of <see cref="UrlAndHash"/>.</returns>
+        public IList UrlAndHashList
+        {
+            get { return m_urlAndHashList; }
+        }
+
+        /// <summary>Encode this <see cref="CertificateUrl"/> to a <see cref="Stream"/>.</summary>
+        /// <param name="output">the <see cref="Stream"/> to encode to.</param>
+        /// <exception cref="IOException"/>
+        public void Encode(Stream output)
+        {
+            TlsUtilities.WriteUint8(m_type, output);
+
+            ListBuffer16 buf = new ListBuffer16();
+            foreach (UrlAndHash urlAndHash in m_urlAndHashList)
+            {
+                urlAndHash.Encode(buf);
+            }
+            buf.EncodeTo(output);
+        }
+
+        /// <summary>Parse a <see cref="CertificateUrl"/> from a <see cref="Stream"/>.</summary>
+        /// <param name="context">the <see cref="TlsContext"/> of the current connection.</param>
+        /// <param name="input">the <see cref="Stream"/> to parse from.</param>
+        /// <returns>a <see cref="CertificateUrl"/> object.</returns>
+        /// <exception cref="IOException"/>
+        public static CertificateUrl Parse(TlsContext context, Stream input)
+        {
+            short type = TlsUtilities.ReadUint8(input);
+            if (!CertChainType.IsValid(type))
+                throw new TlsFatalAlert(AlertDescription.decode_error);
+
+            int totalLength = TlsUtilities.ReadUint16(input);
+            if (totalLength < 1)
+                throw new TlsFatalAlert(AlertDescription.decode_error);
+
+            byte[] urlAndHashListData = TlsUtilities.ReadFully(totalLength, input);
+
+            MemoryStream buf = new MemoryStream(urlAndHashListData, false);
+
+            IList url_and_hash_list = Platform.CreateArrayList();
+            while (buf.Position < buf.Length)
+            {
+                UrlAndHash url_and_hash = UrlAndHash.Parse(context, buf);
+                url_and_hash_list.Add(url_and_hash);
+            }
+
+            if (type == CertChainType.pkipath && url_and_hash_list.Count != 1)
+                throw new TlsFatalAlert(AlertDescription.decode_error);
+
+            return new CertificateUrl(type, url_and_hash_list);
+        }
+
+        // TODO Could be more generally useful
+        internal class ListBuffer16
+             : MemoryStream
+        {
+            internal ListBuffer16()
+            {
+                // Reserve space for length
+                TlsUtilities.WriteUint16(0, this);
+            }
+
+            internal void EncodeTo(Stream output)
+            {
+                // Patch actual length back in
+                int length = (int)Length - 2;
+                TlsUtilities.CheckUint16(length);
+
+                Seek(0L, SeekOrigin.Begin);
+                TlsUtilities.WriteUint16(length, this);
+
+                Streams.WriteBufTo(this, output);
+
+                Platform.Dispose(this);
+            }
+        }
+    }
+}