1 files changed, 83 insertions, 0 deletions
diff --git a/crypto/src/tls/UrlAndHash.cs b/crypto/src/tls/UrlAndHash.cs
new file mode 100644
index 000000000..47347c185
--- /dev/null
+++ b/crypto/src/tls/UrlAndHash.cs
@@ -0,0 +1,83 @@
+using System;
+using System.IO;
+
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Tls
+{
+    /// <summary>RFC 6066 5.</summary>
+    public sealed class UrlAndHash
+    {
+        private readonly string m_url;
+        private readonly byte[] m_sha1Hash;
+
+        public UrlAndHash(string url, byte[] sha1Hash)
+        {
+            if (TlsUtilities.IsNullOrEmpty(url) || url.Length >= (1 << 16))
+                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");
+
+            this.m_url = url;
+            this.m_sha1Hash = sha1Hash;
+        }
+
+        public string Url
+        {
+            get { return m_url; }
+        }
+
+        public byte[] Sha1Hash
+        {
+            get { return m_sha1Hash; }
+        }
+
+        /// <summary>Encode this <see cref="UrlAndHash"/> 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)
+        {
+            byte[] urlEncoding = Strings.ToByteArray(m_url);
+            TlsUtilities.WriteOpaque16(urlEncoding, output);
+
+            if (m_sha1Hash == null)
+            {
+                TlsUtilities.WriteUint8(0, output);
+            }
+            else
+            {
+                TlsUtilities.WriteUint8(1, output);
+                output.Write(m_sha1Hash, 0, m_sha1Hash.Length);
+            }
+        }
+
+        /// <summary>Parse a <see cref="UrlAndHash"/> 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="UrlAndHash"/> object.</returns>
+        /// <exception cref="IOException"/>
+        public static UrlAndHash Parse(TlsContext context, Stream input)
+        {
+            byte[] urlEncoding = TlsUtilities.ReadOpaque16(input, 1);
+            string url = Strings.FromByteArray(urlEncoding);
+
+            byte[] sha1Hash = null;
+            short padding = TlsUtilities.ReadUint8(input);
+            switch (padding)
+            {
+            case 0:
+                if (TlsUtilities.IsTlsV12(context))
+                    throw new TlsFatalAlert(AlertDescription.illegal_parameter);
+
+                break;
+            case 1:
+                sha1Hash = TlsUtilities.ReadFully(20, input);
+                break;
+            default:
+                throw new TlsFatalAlert(AlertDescription.illegal_parameter);
+            }
+
+            return new UrlAndHash(url, sha1Hash);
+        }
+    }
+}