From b02e033873d447fb18c23f3bea87cc182723803b Mon Sep 17 00:00:00 2001
From: lifegpc <root@lifegpc.com>
Date: Fri, 10 Apr 2026 14:04:42 +0800
Subject: [PATCH] Add ExaCrypt (untested)

---
 msg_tool_xp3data/crypt.json                   |  4 ++++
 src/scripts/kirikiri/archive/xp3/crypt/mod.rs | 17 +++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/msg_tool_xp3data/crypt.json b/msg_tool_xp3data/crypt.json
index 0bda33f..1af4cd1 100644
--- a/msg_tool_xp3data/crypt.json
+++ b/msg_tool_xp3data/crypt.json
@@ -1425,6 +1425,10 @@
         "$type": "HashCrypt",
         "Title": "女体化パニック！ ～オンナのコのカラダってキモチイイ～"
     },
+    "Oazuke Fetish!": {
+        "$type": "ExaCrypt",
+        "Title": "おあずけフェティッシュ！"
+    },
     "Ochiteiku Wakazuma Maiko": {
         "$type": "NephriteCrypt",
         "Title": "堕ちていく若妻麻衣子"
diff --git a/src/scripts/kirikiri/archive/xp3/crypt/mod.rs b/src/scripts/kirikiri/archive/xp3/crypt/mod.rs
index c59d0fe..797e27e 100644
--- a/src/scripts/kirikiri/archive/xp3/crypt/mod.rs
+++ b/src/scripts/kirikiri/archive/xp3/crypt/mod.rs
@@ -180,6 +180,7 @@ enum CryptType {
     StripeCrypt {
         key: u8,
     },
+    ExaCrypt,
 }
 
 #[derive(Clone, Debug, Deserialize)]
@@ -281,6 +282,7 @@ impl Schema {
             CryptType::AkabeiCrypt { seed } => Box::new(AkabeiCrypt::new(self.base.clone(), *seed)),
             CryptType::HaikuoCrypt => Box::new(HaikuoCrypt::new(self.base.clone())),
             CryptType::StripeCrypt { key } => Box::new(StripeCrypt::new(self.base.clone(), *key)),
+            CryptType::ExaCrypt => Box::new(ExaCrypt::new(self.base.clone())),
         })
     }
 }
@@ -1192,6 +1194,21 @@ impl<R: Read> Read for StripeCryptReader<R> {
     }
 }
 
+seek_crypt_filehash_key_impl!(ExaCrypt, ExaCryptReader<T>);
+
+impl<R: Read> Read for ExaCryptReader<R> {
+    fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> {
+        let readed = self.inner.read(buf)?;
+        let mut shift = ((self.seg_start + self.pos) % 5) as u32;
+        for t in (&mut buf[..readed]).iter_mut() {
+            *t ^= (self.key >> shift) as u8;
+            shift = (shift + 1) % 5;
+        }
+        self.pos += readed as u64;
+        Ok(readed)
+    }
+}
+
 #[test]
 fn test_deserialize_crypt() {
     for (key, schema) in CRYPT_SCHEMA.iter() {