Add support to extract keys from protected exe

Cargo.lock

@@ -1510,6 +1510,18 @@ dependencies = [
  "rle-decode-fast",
 ]
 
+[[package]]
+name = "libsteamless"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "73e463ef0797adef557f8747a89ea24fcc402b787f4c75465c8b3392ccc73fc3"
+dependencies = [
+ "aes",
+ "anyhow",
+ "cbc",
+ "pelite",
+]
+
 [[package]]
 name = "libtlg-rs"
 version = "0.2.4"
@@ -1681,6 +1693,7 @@ dependencies = [
  "json",
  "lazy_static",
  "libflac-sys",
+ "libsteamless",
  "libtlg-rs",
  "lz4",
  "markup5ever",

Cargo.toml

@@ -39,6 +39,7 @@ json = { version = "0.12", optional = true }
 jpegxl-sys = { package = "msg-tool-jpegxl-sys", version = "0.11", optional = true, features = ["vendored"] }
 lazy_static = "1.5.0"
 libflac-sys = { version = "0.3", optional = true }
+libsteamless = { version = "0.1", optional = true }
 libtlg-rs = { version = "0.2", optional = true, features = ["encode"] }
 lz4 = { version = "1.28", optional = true }
 markup5ever = { version = "0.38", optional = true }
@@ -109,7 +110,7 @@ hexen-haus = ["dep:memchr", "utils-str"]
 hexen-haus-arc = ["hexen-haus"]
 hexen-haus-img = ["hexen-haus", "image"]
 kirikiri = ["emote-psb", "fancy-regex", "flate2", "json", "dep:lz4", "utils-escape"]
-kirikiri-arc = ["kirikiri", "dep:adler", "dep:aes", "dep:argon2", "dep:base64", "dep:blake2", "dep:bytes", "dep:cbc", "dep:chacha20", "chacha20/legacy", "chacha20/xchacha", "dep:fastcdc", "flate2", "dep:hex", "dep:int-enum", "dep:md5", "dep:memchr", "msg_tool_macro/kirikiri-arc", "dep:msg_tool_xp3data", "dep:parse-size", "dep:pelite", "serde/rc", "dep:sha2", "dep:sha3", "dep:shake", "dep:siphasher", "dep:tjs2dec", "utils-case-insensitive-string", "utils-lzss", "utils-serde-base64bytes", "utils-simple-pack", "zopfli", "zstd"]
+kirikiri-arc = ["kirikiri", "dep:adler", "dep:aes", "dep:argon2", "dep:base64", "dep:blake2", "dep:bytes", "dep:cbc", "dep:chacha20", "chacha20/legacy", "chacha20/xchacha", "dep:fastcdc", "flate2", "dep:hex", "dep:int-enum", "dep:libsteamless", "dep:md5", "dep:memchr", "msg_tool_macro/kirikiri-arc", "dep:msg_tool_xp3data", "dep:parse-size", "dep:pelite", "serde/rc", "dep:sha2", "dep:sha3", "dep:shake", "dep:siphasher", "dep:tjs2dec", "utils-case-insensitive-string", "utils-lzss", "utils-serde-base64bytes", "utils-simple-pack", "zopfli", "zstd"]
 kirikiri-img = ["kirikiri", "image", "dep:libtlg-rs"]
 musica = []
 musica-arc = ["musica", "dep:crc32fast", "flate2", "dep:include-flate", "utils-blowfish", "utils-rc4", "utils-serde-base64bytes", "utils-xored-stream"]

src/scripts/kirikiri/archive/xp3/crypt/cx.rs

@@ -3655,7 +3655,36 @@ fn load_key_packages_from_exe<S: AsRef<std::path::Path> + ?Sized>(path: &S) -> V
 
 fn load_key_package_from_path<S: AsRef<std::path::Path> + ?Sized>(path: &S) -> Result<KeyPackage> {
     let view = pelite::FileMap::open(path)?;
-    load_key_package(&view, path)
+    let mut last_error = match load_key_package(&view, path) {
+        Ok(key) => return Ok(key),
+        Err(e) => e,
+    };
+    if libsteamless::is_steamstub(&view) {
+        let options = libsteamless::SteamlessOptions::default();
+        match libsteamless::process_data(view.as_ref().to_vec(), &options, &|_level, _message| {}) {
+            Ok(unpacked) => match load_key_package(&unpacked, path) {
+                Ok(key) => return Ok(key),
+                Err(e) => {
+                    last_error = e;
+                }
+            },
+            Err(err) => {
+                last_error = err;
+            }
+        }
+    }
+    let v = view.as_ref();
+    // DMM DRM may put game exe at the end of protected exe
+    if let Some(pos) = memchr::memmem::find(&v[4..], &v[..4]) {
+        let nv = &v[4 + pos..];
+        match load_key_package(&nv, path) {
+            Ok(key) => return Ok(key),
+            Err(e) => {
+                last_error = e;
+            }
+        }
+    }
+    Err(last_error)
 }
 
 fn find_resource<