misc/rust_fixme_3

2026-07-02 00:35:33 +09:00
parent 997036d28a
commit b2a684df66
3 changed files with 126 additions and 0 deletions
@@ -0,0 +1,70 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "crossbeam-deque"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "613f8cc01fe9cf1a3eb3d7f488fd2fa8388403e97039e2f73692932e291a770d"
+dependencies = [
+ "crossbeam-epoch",
+ "crossbeam-utils",
+]
+
+[[package]]
+name = "crossbeam-epoch"
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+dependencies = [
+ "crossbeam-utils",
+]
+
+[[package]]
+name = "crossbeam-utils"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+
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+
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+name = "rayon"
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+dependencies = [
+ "either",
+ "rayon-core",
+]
+
+[[package]]
+name = "rayon-core"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "crossbeam-deque",
+ "crossbeam-utils",
+]
+
+[[package]]
+name = "rust_proj"
+version = "0.1.0"
+dependencies = [
+ "xor_cryptor",
+]
+
+[[package]]
+name = "xor_cryptor"
+version = "1.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72e5adf4efbff008434783ea27dab065d79d4c4eb61d2f6eb1299bec75139209"
+dependencies = [
+ "rayon",
+]
@@ -0,0 +1,7 @@
+[package]
+name = "rust_proj"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+xor_cryptor = "1.2.3"
@@ -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);
+}