From 83fa48b71dde357ff79d521678f6727e638e76f1 Mon Sep 17 00:00:00 2001
From: morkt <morkt@users.noreply.github.com>
Date: Tue, 10 Apr 2018 22:18:11 +0400
Subject: [PATCH] (NephriteCrypt): another KiriKiri encryption scheme.

---
 ArcFormats/KiriKiri/CryptAlgorithms.cs | 28 ++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/ArcFormats/KiriKiri/CryptAlgorithms.cs b/ArcFormats/KiriKiri/CryptAlgorithms.cs
index 158333a6..5379392d 100644
--- a/ArcFormats/KiriKiri/CryptAlgorithms.cs
+++ b/ArcFormats/KiriKiri/CryptAlgorithms.cs
@@ -578,6 +578,34 @@ namespace GameRes.Formats.KiriKiri
         }
     }
 
+    [Serializable]
+    public class NephriteCrypt : ICrypt
+    {
+        public override byte Decrypt (Xp3Entry entry, long offset, byte value)
+        {
+            if (0 != (offset & 1))
+                return (byte)(value ^ offset);
+            else
+                return (byte)(value ^ entry.Hash);
+        }
+
+        public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
+        {
+            for (int i = 0; i < count; ++i, ++offset)
+            {
+                if (0 != (offset & 1))
+                    values[pos+i] ^= (byte)offset;
+                else
+                    values[pos+i] ^= (byte)entry.Hash;
+            }
+        }
+
+        public override void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
+        {
+            Decrypt (entry, offset, values, pos, count);
+        }
+    }
+
     [Serializable]
     public class GakuenButouCrypt : ICrypt
     {