commit 0a2c93748d26708e9ca097e5e39a2eac344ab6c5
Author: Olivia Brooks <109807080+Cutieguwu@users.noreply.github.com>
Date:   Sun Nov 23 10:18:59 2025 -0500

    Initial commit.

diff --git a/.gitignore b/.gitignore
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index 0000000..ea8c4bf
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diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..e132881
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..a4c7028
--- /dev/null
+++ b/Cargo.toml
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+[package]
+name = "md_undo"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+hex = "0.4.3"
+hex-literal = "1.1.0"
+md2 = "0.10.2"
+rand = "0.9.2"
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..22ad394
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,65 @@
+use std::thread;
+
+use hex_literal;
+use md2::{Digest, Md2};
+
+const CHAR_SET: &[u8] =
+    "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ&.<(+|-!$*);/,%_>?:#'0=\"@~".as_bytes();
+const MAX_LEN: usize = CHAR_SET.len();
+const TARGET: [u8; 16] = hex_literal::hex!("e809236d4b94e54174e666cf3b1f53ce");
+const KNOWN: &str = "CYBERSCI(PUNCH?C4RD?1S?7H3?FL4SH?ST0RAGE?OF?";
+
+fn main() {
+    let mut hasher = Md2::new();
+    hasher.update(KNOWN);
+
+    let mut handles = vec![];
+
+    for idx in 0..MAX_LEN {
+        handles.push(thread::spawn(move || {
+            brute(CHAR_SET[idx.clone()]);
+        }));
+    }
+
+    for h in handles {
+        h.join().unwrap();
+    }
+}
+
+fn brute(start_val: u8) {
+    let mut hasher = Md2::new();
+    hasher.update(KNOWN);
+    let mut result = hasher.finalize_reset();
+
+    let mut a: usize = 0;
+    let mut b: usize = 0;
+    let mut c: usize = 0;
+
+    let mut guess = String::new();
+    while result[..] != TARGET {
+        if a == (MAX_LEN - 1) {
+            a = 0;
+            b += 1;
+        } else {
+            a += 1;
+        }
+
+        if b == MAX_LEN {
+            b = 0;
+            c += 1;
+        }
+
+        if c == MAX_LEN {
+            return ();
+        }
+
+        guess = format!(
+            "{}{}{}{}{})",
+            KNOWN, &start_val, CHAR_SET[c], CHAR_SET[b], CHAR_SET[a],
+        );
+        hasher.update(&guess);
+        result = hasher.finalize_reset();
+    }
+
+    println!("{}", guess);
+}