general rust-fixme-3

Author: codedsprit

src/PICOCTF/GENERAL/rust-fixme-3/fixme3.tar.gz

@@ -0,0 +1,7 @@
+[package]
+name = "rust_proj"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+xor_cryptor = "1.2.3"

src/PICOCTF/GENERAL/rust-fixme-3/fixme3/Cargo.lock

@@ -0,0 +1,41 @@
+use xor_cryptor::XORCryptor;
+
+fn decrypt(encrypted_buffer: Vec<u8>, borrowed_string: &mut String) {
+    // Key for decryption
+    let key = String::from("CSUCKS");
+
+    // Editing our borrowed value
+    borrowed_string.push_str("PARTY FOUL! Here is your flag: ");
+
+    // Create decryption object
+    let res = XORCryptor::new(&key);
+    if res.is_err() {
+        return;
+    }
+    let xrc = res.unwrap();
+
+    // Decrypt the flag
+    let decrypted_buffer = xrc.decrypt_vec(encrypted_buffer);
+
+    // Append the decrypted result to the borrowed string
+    borrowed_string.push_str(&String::from_utf8_lossy(&decrypted_buffer));
+
+    println!("{}", borrowed_string);
+}
+
+fn main() {
+    // Encrypted flag values
+    let hex_values = [
+        "41", "30", "20", "63", "4a", "45", "54", "76", "12", "90", "7e", "53", "63", "e1", "01", "35",
+        "7e", "59", "60", "f6", "03", "86", "7f", "56", "41", "29", "30", "6f", "08", "c3", "61", "f9", "35",
+    ];
+
+    // Convert the hexadecimal strings to bytes and collect them into a vector
+    let encrypted_buffer: Vec<u8> = hex_values.iter()
+        .map(|&hex| u8::from_str_radix(hex, 16).unwrap())
+        .collect();
+
+    let mut party_foul = String::from("Using memory unsafe languages is a: ");
+    decrypt(encrypted_buffer, &mut party_foul);
+}
+

src/PICOCTF/GENERAL/rust-fixme-3/fixme3/Cargo.toml

@@ -0,0 +1,49 @@
+use xor_cryptor::XORCryptor;
+
+fn decrypt(encrypted_buffer: Vec<u8>, borrowed_string: &mut String) {
+    // Key for decryption
+    let key = String::from("CSUCKS");
+
+    // Editing our borrowed value
+    borrowed_string.push_str("PARTY FOUL! Here is your flag: ");
+
+    // Create decryption object
+    let res = XORCryptor::new(&key);
+    if res.is_err() {
+        return;
+    }
+    let xrc = res.unwrap();
+
+    // Did you know you have to do "unsafe operations in Rust?
+    // https://doc.rust-lang.org/book/ch19-01-unsafe-rust.html
+    // Even though we have these memory safe languages, sometimes we need to do things outside of the rules
+    // This is where unsafe rust comes in, something that is important to know about in order to keep things in perspective
+    
+    // unsafe {
+        // Decrypt the flag operations 
+        let decrypted_buffer = xrc.decrypt_vec(encrypted_buffer);
+
+        // Creating a pointer 
+        let decrypted_ptr = decrypted_buffer.as_ptr();
+        let decrypted_len = decrypted_buffer.len();
+        
+        // Unsafe operation: calling an unsafe function that dereferences a raw pointer
+        let decrypted_slice = std::slice::from_raw_parts(decrypted_ptr, decrypted_len);
+
+        borrowed_string.push_str(&String::from_utf8_lossy(decrypted_slice));
+    // }
+    println!("{}", borrowed_string);
+}
+
+fn main() {
+    // Encrypted flag values
+    let hex_values = ["41", "30", "20", "63", "4a", "45", "54", "76", "12", "90", "7e", "53", "63", "e1", "01", "35", "7e", "59", "60", "f6", "03", "86", "7f", "56", "41", "29", "30", "6f", "08", "c3", "61", "f9", "35"];
+
+    // Convert the hexadecimal strings to bytes and collect them into a vector
+    let encrypted_buffer: Vec<u8> = hex_values.iter()
+        .map(|&hex| u8::from_str_radix(hex, 16).unwrap())
+        .collect();
+
+    let mut party_foul = String::from("Using memory unsafe languages is a: ");
+    decrypt(encrypted_buffer, &mut party_foul);
+}

src/PICOCTF/GENERAL/rust-fixme-3/fixme3/src/main-flag.rs

@@ -0,0 +1 @@
+{"rustc_fingerprint":16153101823103919521,"outputs":{"13331785392996375709":{"success":true,"status":"","code":0,"stdout":"___\nlib___.rlib\nlib___.so\nlib___.so\nlib___.a\nlib___.so\n/usr\noff\npacked\nunpacked\n___\ndebug_assertions\npanic=\"unwind\"\nproc_macro\ntarget_abi=\"\"\ntarget_arch=\"x86_64\"\ntarget_endian=\"little\"\ntarget_env=\"gnu\"\ntarget_family=\"unix\"\ntarget_feature=\"fxsr\"\ntarget_feature=\"sse\"\ntarget_feature=\"sse2\"\ntarget_has_atomic=\"16\"\ntarget_has_atomic=\"32\"\ntarget_has_atomic=\"64\"\ntarget_has_atomic=\"8\"\ntarget_has_atomic=\"ptr\"\ntarget_os=\"linux\"\ntarget_pointer_width=\"64\"\ntarget_vendor=\"unknown\"\nunix\n","stderr":""},"17747080675513052775":{"success":true,"status":"","code":0,"stdout":"rustc 1.85.1 (4eb161250 2025-03-15) (Arch Linux rust 1:1.85.1-1)\nbinary: rustc\ncommit-hash: 4eb161250e340c8f48f66e2b929ef4a5bed7c181\ncommit-date: 2025-03-15\nhost: x86_64-unknown-linux-gnu\nrelease: 1.85.1\nLLVM version: 19.1.7\n","stderr":""}},"successes":{}}

src/PICOCTF/GENERAL/rust-fixme-3/fixme3/src/main.rs

@@ -0,0 +1,3 @@
+Signature: 8a477f597d28d172789f06886806bc55
+# This file is a cache directory tag created by cargo.
+# For information about cache directory tags see https://bford.info/cachedir/

src/PICOCTF/GENERAL/rust-fixme-3/fixme3/target/.rustc_info.json

@@ -0,0 +1 @@
+This file has an mtime of when this was started.