Initial commit

Signed-off-by: Benjamin Mordaunt <crawford.benjamin15@gmail.com>

.gitignore

@@ -0,0 +1 @@
+/target

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "byteorder"
+version = "1.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
+
+[[package]]
+name = "leak_test"
+version = "0.1.0"
+dependencies = [
+ "byteorder",
+ "once_cell",
+]
+
+[[package]]
+name = "once_cell"
+version = "1.16.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "86f0b0d4bf799edbc74508c1e8bf170ff5f41238e5f8225603ca7caaae2b7860"

Cargo.toml

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+[package]
+name = "leak_test"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+once_cell = "1.16.0"
+byteorder = "1.4.3"

src/main.rs

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+use std::io::{Read, Seek, SeekFrom};
+use std::fs::File;
+use std::default::Default;
+
+#[derive(Default)]
+pub struct NDSCartridgeHeader {
+    gametitle: [u8; 12],
+    gamecode:  [u8;  4],
+}
+
+impl NDSCartridgeHeader {
+    
+    pub fn parse_nds<R: Read + Seek>(mut cart: R) -> Self {
+        let mut hdr = Self::default();
+
+        cart.seek(SeekFrom::Start(0)).unwrap();
+        cart.read_exact(&mut hdr.gametitle).expect("Could not read gametitle");
+        cart.read_exact(&mut hdr.gamecode).expect("Could not read gamecode");
+
+        hdr
+    }
+}
+
+pub fn blowfish_nds(v: &mut u64, kbuf: &[u32], enc: bool) {
+    let mut x: u32 = *v as u32;
+    let mut y: u32 = (*v >> 32) as u32;
+    let mut z: u32;
+    let koff: usize = if enc { 0x10 } else { 0x00 };
+
+    let iter: Box<dyn Iterator<Item = usize>> =
+        if enc {
+            Box::new(0..16)
+        } else {
+            Box::new((2..18).rev())
+    };
+
+    for i in iter {
+        z = kbuf[i] ^ x; // P-array XOR
+        x = kbuf[(0x12  + ((z >> 24) & 0xFF)) as usize];     // S-box[0]
+        x = kbuf[(0x112 + ((z >> 16) & 0xFF)) as usize] + x; // S-box[1]
+        x = kbuf[(0x212 + ((z >> 8)  & 0xFF)) as usize] ^ x; // S-box[2]
+        x = kbuf[(0x312 + ((z >> 0)  & 0xFF)) as usize] + x; // S-box[3]
+        x = y ^ x;
+        y = z;
+    }
+
+    // Swap + P-array[16,17] XOR
+    *v = ((x ^ kbuf[koff]) as u64) | (((y ^ kbuf[1 + koff]) as u64) << 32); 
+}
+
+fn main() {
+    let mut ndsfile = File::open("pokemon.nds").unwrap();
+    let encr_data = File::open("encr_data.bin").unwrap();
+
+    let titlecode = NDSCartridgeHeader::parse_nds(&mut ndsfile).gamecode;
+    let titlecode4: u32 = u32::from_le_bytes(titlecode);
+
+    let keycode: [u32; 3] = [
+        titlecode4,
+        titlecode4 >> 1,
+        titlecode4 << 1,
+    ];
+}