diff --git a/ArcFormats/ArcFormats.csproj b/ArcFormats/ArcFormats.csproj
index cfeb8b27..38c6f856 100644
--- a/ArcFormats/ArcFormats.csproj
+++ b/ArcFormats/ArcFormats.csproj
@@ -97,6 +97,7 @@
+
diff --git a/ArcFormats/Crowd/ImageCRZ.cs b/ArcFormats/Crowd/ImageCRZ.cs
new file mode 100644
index 00000000..cd682a66
--- /dev/null
+++ b/ArcFormats/Crowd/ImageCRZ.cs
@@ -0,0 +1,170 @@
+//! \file ImageCRZ.cs
+//! \date Tue Mar 28 09:49:56 2017
+//! \brief Crowd encrypted image format.
+//
+// Copyright (C) 2017 by morkt
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+//
+
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.Composition;
+using System.IO;
+using System.Linq;
+using System.Windows.Media;
+using GameRes.Compression;
+
+namespace GameRes.Formats.Crowd
+{
+ internal class CrzMetaData : ImageMetaData
+ {
+ public int HeaderSize;
+ }
+
+ [Serializable]
+ public class CrzScheme : ResourceScheme
+ {
+ public IDictionary KnownKeys;
+ }
+
+ [Export(typeof(ImageFormat))]
+ public class CrzFormat : ImageFormat
+ {
+ public override string Tag { get { return "CRZ"; } }
+ public override string Description { get { return "Crowd encrypted image format"; } }
+ public override uint Signature { get { return 0x44445A53; } } // 'SZDD'
+
+ public override ImageMetaData ReadMetaData (IBinaryStream file)
+ {
+ file.Position = 0xE;
+ using (var lz = new LzssStream (file.AsStream, LzssMode.Decompress, true))
+ {
+ lz.Config.FrameSize = 0x1000;
+ lz.Config.FrameFill = 0x20;
+ lz.Config.FrameInitPos = 0x1000 - 0x10;
+ var header = new byte[0x24];
+ if (0x11 != lz.Read (header, 0, 0x11))
+ return null;
+ var key = KnownKeys.Where (x => header.AsciiEqual (x.Key)).Select (x => x.Value).FirstOrDefault();
+ if (null == key)
+ return null;
+ var seed = new byte[0x10];
+ lz.Read (seed, 0, 0x10);
+ lz.Read (header, 0, 0x24);
+
+ for (int i = 0; i < 0x24; ++i)
+ header[i] ^= key[i];
+ for (int i = 0; i < 0x24; ++i)
+ header[i] ^= seed[i & 0xF];
+
+ return new CrzMetaData {
+ Width = header.ToUInt32 (4),
+ Height = header.ToUInt32 (0x10),
+ BPP = 16,
+ HeaderSize = header.ToInt32 (0x18) + 0x45
+ };
+ }
+ }
+
+ public override ImageData Read (IBinaryStream file, ImageMetaData info)
+ {
+ file.Position = 0xE;
+ using (var lz = new LzssStream (file.AsStream, LzssMode.Decompress, true))
+ {
+ lz.Config.FrameSize = 0x1000;
+ lz.Config.FrameFill = 0x20;
+ lz.Config.FrameInitPos = 0x1000 - 0x10;
+ var meta = (CrzMetaData)info;
+ var header = new byte[meta.HeaderSize];
+ lz.Read (header, 0, header.Length);
+ int stride = (int)info.Width * 2;
+ var pixels = new byte[stride * (int)info.Height];
+ if (pixels.Length != lz.Read (pixels, 0, pixels.Length))
+ throw new InvalidFormatException();
+ return ImageData.Create (info, PixelFormats.Bgr555, null, pixels, stride);
+ }
+ }
+
+ public override void Write (Stream file, ImageData image)
+ {
+ throw new System.NotImplementedException ("CrzFormat.Write not implemented");
+ }
+
+ public static byte[] GenerateKey (string secret)
+ {
+ var key = new byte[0x24];
+ for (int i = 0; i < key.Length; ++i)
+ {
+ key[i] = (byte)(i * i);
+ }
+ int k = 0;
+ for (int i = 0; i < secret.Length; ++i)
+ {
+ int t = secret[i];
+ int n;
+ switch (t & 7)
+ {
+ case 0:
+ key[k] = (byte)~t;
+ break;
+ case 1:
+ key[k] <<= 1;
+ break;
+ case 2:
+ key[k] *= key[k];
+ break;
+ case 3:
+ key[k] = (byte)~(key[k] << 1);
+ break;
+ case 4:
+ key[k] = (byte)((key[k] + 0x32) << 1);
+ break;
+ case 5:
+ n = ~key[k];
+ key[k] = (byte)n;
+ k += n & 3;
+ break;
+ case 6:
+ n = key[k] >> 1;
+ key[k] = (byte)n;
+ k -= n & 3;
+ break;
+ case 7:
+ n = key[k] << 1;;
+ key[k] = (byte)n;
+ k += n & 7;
+ break;
+ }
+ ++k;
+ if (k >= key.Length)
+ k = 0;
+ }
+ return key;
+ }
+
+ IDictionary KnownKeys = new Dictionary();
+
+ public override ResourceScheme Scheme
+ {
+ get { return new CrzScheme { KnownKeys = KnownKeys }; }
+ set { KnownKeys = ((CrzScheme)value).KnownKeys; }
+ }
+ }
+}