(KiriKiri): another encryption scheme.

ArcFormats/KiriKiri/CryptAlgorithms.cs

@@ -24,6 +24,8 @@
 //
 
 using System;
+using System.Collections.Generic;
+using System.Linq;
 using GameRes.Utility;
 
 namespace GameRes.Formats.KiriKiri
@@ -696,4 +698,48 @@ namespace GameRes.Formats.KiriKiri
             Decrypt (entry, offset, buffer, pos, count);
         }
     }
+
+    [Serializable]
+    public class AkabeiCrypt : ICrypt
+    {
+        private readonly uint m_seed;
+
+        public AkabeiCrypt (uint seed)
+        {
+            m_seed = seed;
+        }
+
+        public override byte Decrypt (Xp3Entry entry, long offset, byte value)
+        {
+            int key_pos = (int)offset & 0x1F;
+            var key = GetKey (entry.Hash).ElementAt (key_pos);
+            return (byte)(value ^ key);
+        }
+
+        public override void Decrypt (Xp3Entry entry, long offset, byte[] buffer, int pos, int count)
+        {
+            var key = GetKey (entry.Hash).ToArray();
+            int key_pos = (int)offset;
+            for (int i = 0; i < count; ++i)
+            {
+                buffer[pos+i] ^= key[key_pos++ & 0x1F];
+            }
+        }
+
+        public override void Encrypt (Xp3Entry entry, long offset, byte[] buffer, int pos, int count)
+        {
+            Decrypt (entry, offset, buffer, pos, count);
+        }
+
+        IEnumerable<byte> GetKey (uint hash)
+        {
+            hash = (hash ^ m_seed) & 0x7FFFFFFF;
+            hash = hash << 31 | hash;
+            for (int i = 0; i < 0x20; ++i)
+            {
+                yield return (byte)hash;
+                hash = (hash & 0xFFFFFFFE) << 23 | hash >> 8;
+            }
+        }
+    }
 }

supported.html

@@ -258,6 +258,7 @@ Se-kirara<br/>
 Sharin no Kuni, Himawari no Shoujo<br/>
 Shokusai no Miyako<br/>
 Swan Song<br/>
+Teakamamire no Tenshi<br/>
 Zecchou Spiral!!<br/>
 </td></tr>
 <tr><td>*.tlg</td><td><tt>TLG0.0</tt><br/><tt>TLG5.0</tt><br/><tt>TLG6.0</tt></td><td>No</td></tr>
@@ -632,6 +633,7 @@ Answer Dead<br/>
 Houou Senki Maimu<br/>
 Kango Sentai Nurse Ranger<br/>
 Megami Taisen<br/>
+Shouryuu Senki Tenmu<br/>
 </td></tr>
 <tr class="odd"><td>*.abm</td><td><tt>BM</tt></td><td>No</td></tr>
 <tr><td>*.arc<br/>*.xarc<br/>*.bin</td><td><tt>MIKO</tt><br/><tt>KOTORI</tt><br/><tt>XARC</tt></td><td>No</td><td rowspan="2">Xuse<br/>ETERNAL</td><td rowspan="2">