From 42fa26fdd43aee28f3a2ac31134a36e426f6f9cd Mon Sep 17 00:00:00 2001
From: lifegpc <root@lifegpc.com>
Date: Fri, 1 May 2026 23:23:52 +0800
Subject: [PATCH] Add FestivalCrypt (untested)

---
 msg_tool_xp3data/crypt.json                   |  4 ++++
 src/scripts/kirikiri/archive/xp3/crypt/mod.rs | 16 ++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/msg_tool_xp3data/crypt.json b/msg_tool_xp3data/crypt.json
index c4a6c8b..c6be55b 100644
--- a/msg_tool_xp3data/crypt.json
+++ b/msg_tool_xp3data/crypt.json
@@ -1171,6 +1171,10 @@
         "Key": 247,
         "Title": "ココロのカタチとイロとオト | 心之形心之色心之声"
     },
+    "Kon Kon": {
+        "$type": "FestivalCrypt",
+        "Title": "魂々"
+    },
     "Kore tte, Riajuu?": {
         "$type": "HashCrypt",
         "Title": "これって、リア充？ ～黒ギャルが、ドーテーを教育するそうですよ～"
diff --git a/src/scripts/kirikiri/archive/xp3/crypt/mod.rs b/src/scripts/kirikiri/archive/xp3/crypt/mod.rs
index 005609e..6df397a 100644
--- a/src/scripts/kirikiri/archive/xp3/crypt/mod.rs
+++ b/src/scripts/kirikiri/archive/xp3/crypt/mod.rs
@@ -243,6 +243,7 @@ enum CryptType {
         mask: u32,
         key_seq: Base64Bytes,
     },
+    FestivalCrypt,
 }
 
 #[derive(Clone, Debug, Deserialize)]
@@ -379,6 +380,7 @@ impl Schema {
             CryptType::SmxCrypt { mask, key_seq } => {
                 Box::new(SmxCrypt::new(self.base.clone(), *mask, &key_seq.bytes)?)
             }
+            CryptType::FestivalCrypt => Box::new(FestivalCrypt::new(self.base.clone())),
         })
     }
 }
@@ -1864,6 +1866,20 @@ impl<R: Read> Read for SmxCryptReader<R> {
     }
 }
 
+seek_crypt_filehash_key_impl!(FestivalCrypt, FestivalCryptReader<T>);
+
+impl<R: Read> Read for FestivalCryptReader<R> {
+    fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> {
+        let readed = self.inner.read(buf)?;
+        let key = (!(self.key >> 7)) as u8;
+        for t in (&mut buf[..readed]).iter_mut() {
+            *t ^= key;
+        }
+        self.pos += readed as u64;
+        Ok(readed)
+    }
+}
+
 #[test]
 fn test_deserialize_crypt() {
     for (key, schema) in CRYPT_SCHEMA.iter() {