Added fakesigning and fakesigning detection, command is in CLI

Cargo.lock

@@ -13,6 +13,15 @@ dependencies = [
  "cpufeatures",
 ]
 
+[[package]]
+name = "aho-corasick"
+version = "1.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e60d3430d3a69478ad0993f19238d2df97c507009a52b3c10addcd7f6bcb916"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "anstream"
 version = "0.6.18"
@@ -237,6 +246,12 @@ version = "0.2.171"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c19937216e9d3aa9956d9bb8dfc0b0c8beb6058fc4f7a4dc4d850edf86a237d6"
 
+[[package]]
+name = "memchr"
+version = "2.7.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "78ca9ab1a0babb1e7d5695e3530886289c18cf2f87ec19a575a0abdce112e3a3"
+
 [[package]]
 name = "once_cell"
 version = "1.21.1"
@@ -261,6 +276,35 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "regex"
+version = "1.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b544ef1b4eac5dc2db33ea63606ae9ffcfac26c1416a2806ae0bf5f56b201191"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-automata",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.4.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "809e8dc61f6de73b46c85f4c96486310fe304c434cfa43669d7b40f711150908"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2b15c43186be67a4fd63bee50d0303afffcef381492ebe2c5d87f324e1b8815c"
+
 [[package]]
 name = "rustii"
 version = "0.1.0"
@@ -271,6 +315,7 @@ dependencies = [
  "clap",
  "glob",
  "hex",
+ "regex",
  "sha1",
 ]
 

Cargo.toml

@@ -30,4 +30,5 @@ aes = "0"
 hex = "0"
 sha1 = "0"
 glob = "0"
+regex = "1"
 clap = { version = "4", features = ["derive"] }

src/bin/playground/main.rs

@@ -1,41 +1,43 @@
 // Sample file for testing rustii library stuff.
 
 use std::fs;
-use rustii::title::{tmd, ticket, content, crypto, wad};
+use rustii::title::{content, crypto, wad};
 use rustii::title;
 
 fn main() {
     let data = fs::read("sm.wad").unwrap();
-    let title = title::Title::from_bytes(&data).unwrap();
+    let mut title = title::Title::from_bytes(&data).unwrap();
     println!("Title ID from WAD via Title object: {}", hex::encode(title.tmd.title_id));
     
     let wad = wad::WAD::from_bytes(&data).unwrap();
     println!("size of tmd: {:?}", wad.tmd().len());
-    let tmd = tmd::TMD::from_bytes(&wad.tmd()).unwrap();
+    println!("num content records: {:?}", title.tmd.content_records.len());
-    println!("num content records: {:?}", tmd.content_records.len());
+    println!("first record data: {:?}", title.tmd.content_records.first().unwrap());
-    println!("first record data: {:?}", tmd.content_records.first().unwrap());
+    if !title.tmd.is_fakesigned() {
-    assert_eq!(wad.tmd(), tmd.to_bytes().unwrap());
+        title.tmd.fakesign().unwrap();
+    }
+    println!("TMD is fakesigned: {:?}",title.tmd.is_fakesigned());
 
-    let tik = ticket::Ticket::from_bytes(&wad.ticket()).unwrap();
+    println!("title version from ticket is: {:?}", title.ticket.title_version);
-    println!("title version from ticket is: {:?}", tik.title_version);
+    println!("title key (enc): {:?}", title.ticket.title_key);
-    println!("title key (enc): {:?}", tik.title_key);
+    println!("title key (dec): {:?}", title.ticket.dec_title_key());
-    println!("title key (dec): {:?}", tik.dec_title_key());
+    if !title.ticket.is_fakesigned() {
-    assert_eq!(wad.ticket(), tik.to_bytes().unwrap());
+        title.ticket.fakesign().unwrap();
+    }
+    println!("ticket is fakesigned: {:?}", title.ticket.is_fakesigned());
     
-    let content_region = content::ContentRegion::from_bytes(&wad.content(), tmd.content_records).unwrap();
+    println!("title is fakesigned: {:?}", title.is_fakesigned());
+
+    let content_region = content::ContentRegion::from_bytes(&wad.content(), title.tmd.content_records).unwrap();
     assert_eq!(wad.content(), content_region.to_bytes().unwrap());
     println!("content OK");
 
-    let content_dec = content_region.get_content_by_index(0, tik.dec_title_key()).unwrap();
+    let content_dec = content_region.get_content_by_index(0, title.ticket.dec_title_key()).unwrap();
     println!("content dec from index: {:?}", content_dec);
 
     let content = content_region.get_enc_content_by_index(0).unwrap();
-    assert_eq!(content, crypto::encrypt_content(&content_dec, tik.dec_title_key(), 0, content_region.content_records[0].content_size));
+    assert_eq!(content, crypto::encrypt_content(&content_dec, title.ticket.dec_title_key(), 0, content_region.content_records[0].content_size));
     println!("content re-encrypted OK");
 
     println!("wad header: {:?}", wad.header);
-
-    let repacked = wad.to_bytes().unwrap();
-    assert_eq!(repacked, data);
-    println!("wad packed OK");
 }

src/bin/rustii/filetypes.rs

@@ -0,0 +1,87 @@
+// filetypes.rs from rustii (c) 2025 NinjaCheetah & Contributors
+// https://github.com/NinjaCheetah/rustii
+//
+// Common code for identifying Wii file types.
+
+use std::{str, fs::File};
+use std::io::Read;
+use std::path::Path;
+use regex::RegexBuilder;
+
+#[derive(Debug)]
+#[derive(PartialEq)]
+pub enum WiiFileType {
+    Wad,
+    Tmd,
+    Ticket
+}
+
+pub fn identify_file_type(input: &str) -> Option<WiiFileType> {
+    let input = Path::new(input);
+    let re = RegexBuilder::new(r"tmd\.?[0-9]*").case_insensitive(true).build().unwrap();
+    // == TMD ==
+    if re.is_match(input.to_str()?) || 
+        input.file_name().is_some_and(|f| f.eq_ignore_ascii_case("tmd.bin")) ||
+        input.extension().is_some_and(|f| f.eq_ignore_ascii_case("tmd")) {
+        return Some(WiiFileType::Tmd);
+    }
+    // == Ticket ==
+    if input.extension().is_some_and(|f| f.eq_ignore_ascii_case("tik")) || 
+        input.file_name().is_some_and(|f| f.eq_ignore_ascii_case("ticket.bin")) ||
+        input.file_name().is_some_and(|f| f.eq_ignore_ascii_case("cetk")) {
+        return Some(WiiFileType::Ticket);
+    }
+    // == WAD ==
+    if input.extension().is_some_and(|f| f.eq_ignore_ascii_case("wad")) {
+        return Some(WiiFileType::Wad);
+    }
+    // Advanced WAD detection, where we read and compare the first 8 bytes (only if the path exists.)
+    if input.exists() {
+        let mut f = File::open(input).unwrap();
+        let mut magic_number = vec![0u8; 8];
+        f.read_exact(&mut magic_number).unwrap();
+        if magic_number == b"\x00\x00\x00\x20\x49\x73\x00\x00" || magic_number == b"\x00\x00\x00\x20\x69\x62\x00\x00" {
+            return Some(WiiFileType::Wad);
+        }
+    }
+    
+    // == No match found! ==
+    None
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn test_parse_tmd() {
+        assert_eq!(identify_file_type("tmd"), Some(WiiFileType::Tmd));
+        assert_eq!(identify_file_type("TMD"), Some(WiiFileType::Tmd));
+        assert_eq!(identify_file_type("tmd.bin"), Some(WiiFileType::Tmd));
+        assert_eq!(identify_file_type("TMD.BIN"), Some(WiiFileType::Tmd));
+        assert_eq!(identify_file_type("tmd.513"), Some(WiiFileType::Tmd));
+        assert_eq!(identify_file_type("0000000100000002.tmd"), Some(WiiFileType::Tmd));
+        assert_eq!(identify_file_type("0000000100000002.TMD"), Some(WiiFileType::Tmd));
+    }
+
+    #[test]
+    fn test_parse_tik() {
+        assert_eq!(identify_file_type("ticket.bin"), Some(WiiFileType::Ticket));
+        assert_eq!(identify_file_type("TICKET.BIN"), Some(WiiFileType::Ticket));
+        assert_eq!(identify_file_type("cetk"), Some(WiiFileType::Ticket));
+        assert_eq!(identify_file_type("CETK"), Some(WiiFileType::Ticket));
+        assert_eq!(identify_file_type("0000000100000002.tik"), Some(WiiFileType::Ticket));
+        assert_eq!(identify_file_type("0000000100000002.TIK"), Some(WiiFileType::Ticket));
+    }
+    
+    #[test]
+    fn test_parse_wad() {
+        assert_eq!(identify_file_type("0000000100000002.wad"), Some(WiiFileType::Wad));
+        assert_eq!(identify_file_type("0000000100000002.WAD"), Some(WiiFileType::Wad));
+    }
+    
+    #[test]
+    fn test_parse_no_match() {
+        assert_eq!(identify_file_type("somefile.txt"), None);
+    }
+}

src/bin/rustii/main.rs

@@ -4,9 +4,10 @@
 // Base for the rustii CLI that handles argument parsing and directs execution to the proper module.
 
 mod title;
-use clap::{Subcommand, Parser};
+mod filetypes;
-use title::wad;
 
+use clap::{Subcommand, Parser};
+use title::{wad, fakesign};
 
 #[derive(Parser)]
 #[command(version, about, long_about = None)]
@@ -23,6 +24,13 @@ enum Commands {
         #[command(subcommand)]
         command: Option<wad::Commands>,
     },
+    /// Fakesign a TMD, Ticket, or WAD (trucha bug)
+    Fakesign {
+        /// Fakesign a TMD, Ticket, or WAD (trucha bug)
+        input: String,
+        #[arg(short, long)]
+        output: Option<String>,
+    }
 }
 
 fn main() {
@@ -39,6 +47,9 @@ fn main() {
                 },
                 &None => { /* This is handled by clap */}
             }
+        },
+        Some(Commands::Fakesign { input, output }) => {
+            fakesign::fakesign(input, output)
         }
         None => {}
     }

src/bin/rustii/title/fakesign.rs

@@ -0,0 +1,60 @@
+// title/fakesign.rs from rustii (c) 2025 NinjaCheetah & Contributors
+// https://github.com/NinjaCheetah/rustii
+//
+// Code for dedicated fakesigning-related commands in the rustii CLI.
+
+use std::{str, fs};
+use std::path::{Path, PathBuf};
+use crate::filetypes::{WiiFileType, identify_file_type};
+use rustii::{title, title::tmd, title::ticket};
+
+pub fn fakesign(input: &str, output: &Option<String>) {
+    let in_path = Path::new(input);
+    if !in_path.exists() {
+        panic!("Error: Input file does not exist.");
+    }
+    match identify_file_type(input) {
+        Some(WiiFileType::Wad) => {
+            let out_path = if output.is_some() {
+                PathBuf::from(output.clone().unwrap().as_str()).with_extension("wad")
+            } else {
+                PathBuf::from(input)
+            };
+            // Load WAD into a Title instance, then fakesign it.
+            let mut title = title::Title::from_bytes(fs::read(in_path).unwrap().as_slice()).expect("could not read WAD file");
+            title.fakesign().expect("could not fakesign WAD");
+            // Write output file.
+            fs::write(out_path, title.to_wad().unwrap().to_bytes().expect("could not create output WAD")).expect("could not write output WAD file");
+            println!("WAD fakesigned!");
+        },
+        Some(WiiFileType::Tmd) => {
+            let out_path = if output.is_some() {
+                PathBuf::from(output.clone().unwrap().as_str()).with_extension("tmd")
+            } else {
+                PathBuf::from(input)
+            };
+            // Load TMD into a TMD instance, then fakesign it.
+            let mut tmd = tmd::TMD::from_bytes(fs::read(in_path).unwrap().as_slice()).expect("could not read TMD file");
+            tmd.fakesign().expect("could not fakesign TMD");
+            // Write output file.
+            fs::write(out_path, tmd.to_bytes().expect("could not create output TMD")).expect("could not write output TMD file");
+            println!("TMD fakesigned!");
+        },
+        Some(WiiFileType::Ticket) => {
+            let out_path = if output.is_some() {
+                PathBuf::from(output.clone().unwrap().as_str()).with_extension("tik")
+            } else {
+                PathBuf::from(input)
+            };
+            // Load Ticket into a Ticket instance, then fakesign it.
+            let mut ticket = ticket::Ticket::from_bytes(fs::read(in_path).unwrap().as_slice()).expect("could not read Ticket file");
+            ticket.fakesign().expect("could not fakesign Ticket");
+            // Write output file.
+            fs::write(out_path, ticket.to_bytes().expect("could not create output Ticket")).expect("could not write output Ticket file");
+            println!("Ticket fakesigned!");
+        },
+        None => {
+            panic!("Error: You can only fakesign TMDs, Tickets, and WADs!");
+        }
+    }
+}

src/bin/rustii/title/mod.rs

@@ -1,4 +1,5 @@
 // title/mod.rs from rustii (c) 2025 NinjaCheetah & Contributors
 // https://github.com/NinjaCheetah/rustii
 
+pub mod fakesign;
 pub mod wad;

src/title/mod.rs

@@ -20,6 +20,8 @@ pub enum TitleError {
     BadTMD,
     BadContent,
     InvalidWAD,
+    TMDError(tmd::TMDError),
+    TicketError(ticket::TicketError),
     WADError(wad::WADError),
     IOError(std::io::Error),
 }
@@ -31,6 +33,8 @@ impl fmt::Display for TitleError {
             TitleError::BadTMD => "The provided TMD data was invalid.",
             TitleError::BadContent => "The provided content data was invalid.",
             TitleError::InvalidWAD => "The provided WAD data was invalid.",
+            TitleError::TMDError(_) => "An error occurred while processing TMD data.",
+            TitleError::TicketError(_) => "An error occurred while processing ticket data.",
             TitleError::WADError(_) => "A WAD could not be built from the provided data.",
             TitleError::IOError(_) => "The provided Title data was invalid.",
         };
@@ -85,6 +89,17 @@ impl Title {
         Ok(title)
     }
     
+    pub fn is_fakesigned(&self) -> bool {
+        self.tmd.is_fakesigned() && self.ticket.is_fakesigned()
+    }
+    
+    pub fn fakesign(&mut self) -> Result<(), TitleError> {
+        // Run the fakesign methods on the TMD and Ticket.
+        self.tmd.fakesign().map_err(TitleError::TMDError)?;
+        self.ticket.fakesign().map_err(TitleError::TicketError)?;
+        Ok(())
+    }
+    
     pub fn get_content_by_index(&self, index: usize) -> Result<Vec<u8>, content::ContentError> {
         let content = self.content.get_content_by_index(index, self.ticket.dec_title_key())?;
         Ok(content)

src/title/ticket.rs

@@ -7,11 +7,13 @@ use std::error::Error;
 use std::fmt;
 use std::io::{Cursor, Read, Write};
 use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};
+use sha1::{Sha1, Digest};
 use crate::title::crypto::decrypt_title_key;
 
 #[derive(Debug)]
 pub enum TicketError {
     UnsupportedVersion,
+    CannotFakesign,
     IOError(std::io::Error),
 }
 
@@ -19,6 +21,7 @@ impl fmt::Display for TicketError {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         let description = match *self {
             TicketError::UnsupportedVersion => "The provided Ticket is not a supported version (only v0 is supported).",
+            TicketError::CannotFakesign => "The Ticket data could not be fakesigned.",
             TicketError::IOError(_) => "The provided Ticket data was invalid.",
         };
         f.write_str(description)
@@ -184,4 +187,37 @@ impl Ticket {
         let issuer_str = String::from_utf8(Vec::from(&self.signature_issuer)).unwrap_or_default();
         issuer_str.contains("Root-CA00000002-XS00000004") || issuer_str.contains("Root-CA00000002-XS00000006")
     }
+    
+    pub fn is_fakesigned(&self) -> bool {
+        // Can't be fakesigned without a null signature.
+        if self.signature != [0; 256] {
+            return false;
+        }
+        // Test the hash of the Ticket body to make sure it starts with 00.
+        let mut hasher = Sha1::new();
+        let ticket_body = self.to_bytes().unwrap();
+        hasher.update(&ticket_body[320..]);
+        let result = hasher.finalize();
+        if result[0] != 0 {
+            return false;
+        }
+        true
+    }
+    
+    pub fn fakesign(&mut self) -> Result<(), TicketError> {
+        // Erase the signature.
+        self.signature = [0; 256];
+        let mut current_int: u16 = 0;
+        let mut test_hash: [u8; 20] = [255; 20];
+        while test_hash[0] != 0 {
+            if current_int == 255 { return Err(TicketError::CannotFakesign); }
+            current_int += 1;
+            self.unknown2 = current_int.to_be_bytes();
+            let mut hasher = Sha1::new();
+            let ticket_body = self.to_bytes().unwrap();
+            hasher.update(&ticket_body[320..]);
+            test_hash = <[u8; 20]>::from(hasher.finalize());
+        }
+        Ok(())
+    }
 }

src/title/tmd.rs

@@ -3,8 +3,29 @@
 //
 // Implements the structures and methods required for TMD parsing and editing.
 
+use std::error::Error;
+use std::fmt;
 use std::io::{Cursor, Read, Write};
 use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};
+use sha1::{Sha1, Digest};
+
+#[derive(Debug)]
+pub enum TMDError {
+    CannotFakesign,
+    IOError(std::io::Error),
+}
+
+impl fmt::Display for TMDError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        let description = match *self {
+            TMDError::CannotFakesign => "The TMD data could not be fakesigned.",
+            TMDError::IOError(_) => "The provided TMD data was invalid.",
+        };
+        f.write_str(description)
+    }
+}
+
+impl Error for TMDError {}
 
 #[derive(Debug)]
 #[derive(Clone)]
@@ -46,55 +67,55 @@ pub struct TMD {
 
 impl TMD {
     /// Creates a new TMD instance from the binary data of a TMD file.
-    pub fn from_bytes(data: &[u8]) -> Result<Self, std::io::Error> {
+    pub fn from_bytes(data: &[u8]) -> Result<Self, TMDError> {
         let mut buf = Cursor::new(data);
-        let signature_type = buf.read_u32::<BigEndian>()?;
+        let signature_type = buf.read_u32::<BigEndian>().map_err(TMDError::IOError)?;
         let mut signature = [0u8; 256];
-        buf.read_exact(&mut signature)?;
+        buf.read_exact(&mut signature).map_err(TMDError::IOError)?;
         // Maybe this can be read differently?
         let mut padding1 = [0u8; 60];
-        buf.read_exact(&mut padding1)?;
+        buf.read_exact(&mut padding1).map_err(TMDError::IOError)?;
         let mut signature_issuer = [0u8; 64];
-        buf.read_exact(&mut signature_issuer)?;
+        buf.read_exact(&mut signature_issuer).map_err(TMDError::IOError)?;
-        let tmd_version = buf.read_u8()?;
+        let tmd_version = buf.read_u8().map_err(TMDError::IOError)?;
-        let ca_crl_version = buf.read_u8()?;
+        let ca_crl_version = buf.read_u8().map_err(TMDError::IOError)?;
-        let signer_crl_version = buf.read_u8()?;
+        let signer_crl_version = buf.read_u8().map_err(TMDError::IOError)?;
-        let is_vwii = buf.read_u8()?;
+        let is_vwii = buf.read_u8().map_err(TMDError::IOError)?;
         let mut ios_tid = [0u8; 8];
-        buf.read_exact(&mut ios_tid)?;
+        buf.read_exact(&mut ios_tid).map_err(TMDError::IOError)?;
         let mut title_id = [0u8; 8];
-        buf.read_exact(&mut title_id)?;
+        buf.read_exact(&mut title_id).map_err(TMDError::IOError)?;
         let mut title_type = [0u8; 4];
-        buf.read_exact(&mut title_type)?;
+        buf.read_exact(&mut title_type).map_err(TMDError::IOError)?;
-        let group_id = buf.read_u16::<BigEndian>()?;
+        let group_id = buf.read_u16::<BigEndian>().map_err(TMDError::IOError)?;
         // Same here...
         let mut padding2 = [0u8; 2];
-        buf.read_exact(&mut padding2)?;
+        buf.read_exact(&mut padding2).map_err(TMDError::IOError)?;
-        let region = buf.read_u16::<BigEndian>()?;
+        let region = buf.read_u16::<BigEndian>().map_err(TMDError::IOError)?;
         let mut ratings = [0u8; 16];
-        buf.read_exact(&mut ratings)?;
+        buf.read_exact(&mut ratings).map_err(TMDError::IOError)?;
         // ...and here...
         let mut reserved1 = [0u8; 12];
-        buf.read_exact(&mut reserved1)?;
+        buf.read_exact(&mut reserved1).map_err(TMDError::IOError)?;
         let mut ipc_mask = [0u8; 12];
-        buf.read_exact(&mut ipc_mask)?;
+        buf.read_exact(&mut ipc_mask).map_err(TMDError::IOError)?;
         // ...and here.
         let mut reserved2 = [0u8; 18];
-        buf.read_exact(&mut reserved2)?;
+        buf.read_exact(&mut reserved2).map_err(TMDError::IOError)?;
-        let access_rights = buf.read_u32::<BigEndian>()?;
+        let access_rights = buf.read_u32::<BigEndian>().map_err(TMDError::IOError)?;
-        let title_version = buf.read_u16::<BigEndian>()?;
+        let title_version = buf.read_u16::<BigEndian>().map_err(TMDError::IOError)?;
-        let num_contents = buf.read_u16::<BigEndian>()?;
+        let num_contents = buf.read_u16::<BigEndian>().map_err(TMDError::IOError)?;
-        let boot_index = buf.read_u16::<BigEndian>()?;
+        let boot_index = buf.read_u16::<BigEndian>().map_err(TMDError::IOError)?;
-        let minor_version = buf.read_u16::<BigEndian>()?;
+        let minor_version = buf.read_u16::<BigEndian>().map_err(TMDError::IOError)?;
         // Build content records by iterating over the rest of the data num_contents times.
         let mut content_records = Vec::with_capacity(num_contents as usize);
         for _ in 0..num_contents {
-            let content_id = buf.read_u32::<BigEndian>()?;
+            let content_id = buf.read_u32::<BigEndian>().map_err(TMDError::IOError)?;
-            let index = buf.read_u16::<BigEndian>()?;
+            let index = buf.read_u16::<BigEndian>().map_err(TMDError::IOError)?;
-            let content_type = buf.read_u16::<BigEndian>()?;
+            let content_type = buf.read_u16::<BigEndian>().map_err(TMDError::IOError)?;
-            let content_size = buf.read_u64::<BigEndian>()?;
+            let content_size = buf.read_u64::<BigEndian>().map_err(TMDError::IOError)?;
             let mut content_hash = [0u8; 20];
-            buf.read_exact(&mut content_hash)?;
+            buf.read_exact(&mut content_hash).map_err(TMDError::IOError)?;
             content_records.push(ContentRecord {
                 content_id,
                 index,
@@ -167,4 +188,37 @@ impl TMD {
         }
         Ok(buf)
     }
+
+    pub fn is_fakesigned(&self) -> bool {
+        // Can't be fakesigned without a null signature.
+        if self.signature != [0; 256] {
+            return false;
+        }
+        // Test the hash of the TMD body to make sure it starts with 00.
+        let mut hasher = Sha1::new();
+        let tmd_body = self.to_bytes().unwrap();
+        hasher.update(&tmd_body[320..]);
+        let result = hasher.finalize();
+        if result[0] != 0 {
+            return false;
+        }
+        true
+    }
+
+    pub fn fakesign(&mut self) -> Result<(), TMDError> {
+        // Erase the signature.
+        self.signature = [0; 256];
+        let mut current_int: u16 = 0;
+        let mut test_hash: [u8; 20] = [255; 20];
+        while test_hash[0] != 0 {
+            if current_int == 255 { return Err(TMDError::CannotFakesign); }
+            current_int += 1;
+            self.minor_version = current_int;
+            let mut hasher = Sha1::new();
+            let ticket_body = self.to_bytes().unwrap();
+            hasher.update(&ticket_body[320..]);
+            test_hash = <[u8; 20]>::from(hasher.finalize());
+        }
+        Ok(())
+    }
 }

src/title/wad.rs

@@ -9,10 +9,14 @@ use std::str;
 use std::io::{Cursor, Read, Seek, SeekFrom, Write};
 use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};
 use crate::title::{tmd, ticket, content};
+use crate::title::ticket::TicketError;
+use crate::title::tmd::TMDError;
 
 #[derive(Debug)]
 pub enum WADError {
     BadType,
+    TMDError(TMDError),
+    TicketError(TicketError),
     IOError(std::io::Error),
 }
 
@@ -20,6 +24,8 @@ impl fmt::Display for WADError {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         let description = match *self {
             WADError::BadType => "An invalid WAD type was specified.",
+            WADError::TMDError(_) => "An error occurred while loading TMD data.",
+            WADError::TicketError(_) => "An error occurred while loading Ticket data.",
             WADError::IOError(_) => "The provided WAD data was invalid.",
         };
         f.write_str(description)
@@ -68,7 +74,7 @@ impl WADHeader {
     pub fn from_body(body: &WADBody) -> Result<WADHeader, WADError> {
         // Generates a new WADHeader from a populated WADBody object.
         // Parse the TMD and use that to determine if this is a standard WAD or a boot2 WAD.
-        let tmd = tmd::TMD::from_bytes(&body.tmd).map_err(WADError::IOError)?;
+        let tmd = tmd::TMD::from_bytes(&body.tmd).map_err(WADError::TMDError)?;
         let wad_type = match hex::encode(tmd.title_id).as_str() {
             "0000000100000001" => WADType::ImportBoot,
             _ => WADType::Installable,