fix README.md

Cargo.lock

@@ -254,6 +254,12 @@ version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9330f8b2ff13f34540b44e946ef35111825727b38d33286ef986142615121801"
 
+[[package]]
+name = "cfg_aliases"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "613afe47fcd5fac7ccf1db93babcb082c5994d996f20b8b159f2ad1658eb5724"
+
 [[package]]
 name = "chrono"
 version = "0.4.42"
@@ -364,6 +370,17 @@ dependencies = [
  "typenum",
 ]
 
+[[package]]
+name = "ctrlc"
+version = "3.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "881c5d0a13b2f1498e2306e82cbada78390e152d4b1378fb28a84f4dcd0dc4f3"
+dependencies = [
+ "dispatch",
+ "nix",
+ "windows-sys 0.61.2",
+]
+
 [[package]]
 name = "digest"
 version = "0.10.7"
@@ -396,6 +413,12 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "dispatch"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bd0c93bb4b0c6d9b77f4435b0ae98c24d17f1c45b2ff844c6151a07256ca923b"
+
 [[package]]
 name = "displaydoc"
 version = "0.2.5"
@@ -473,6 +496,7 @@ version = "0.1.0"
 dependencies = [
  "anyhow",
  "clap",
+ "ctrlc",
  "fancy-regex",
  "num-integer",
  "num_cpus",
@@ -884,6 +908,18 @@ version = "1.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "650eef8c711430f1a879fdd01d4745a7deea475becfb90269c06775983bbf086"
 
+[[package]]
+name = "nix"
+version = "0.30.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "74523f3a35e05aba87a1d978330aef40f67b0304ac79c1c00b294c9830543db6"
+dependencies = [
+ "bitflags",
+ "cfg-if",
+ "cfg_aliases",
+ "libc",
+]
+
 [[package]]
 name = "nom"
 version = "7.1.3"

Cargo.toml

@@ -12,6 +12,7 @@ categories = ["command-line-utilities"]
 [dependencies]
 anyhow = "1.0.100"
 clap = { version = "4.5.50", features = ["derive"] }
+ctrlc = "3.5.0"
 fancy-regex = "0.16.2"
 num-integer = "0.1.46"
 num_cpus = "1.17.0"

README.md

@@ -51,7 +51,7 @@ Also see <https://en.wikipedia.org/wiki/Hexspeak> for some further examples of "
 ### How long does it take?
 
 On my machine with an AMD Ryzen 7 5800X processor, Fingerprunk is able to generate and check about
-41000 keys per second. This means that for finding a fingerprint with a string of *n* specific
+43500 keys per second. This means that for finding a fingerprint with a string of *n* specific
 hexadecimal digits at a specific place, I could expect the following runtimes until finding the
 first key:
 
@@ -60,15 +60,15 @@ first key:
 |   1 |              16 =  16¹ |    < 0.1 secs |
 |   2 |             256 =  16² |    < 0.1 secs |
 |   3 |            4096 =  16³ |      0.1 secs |
-|   4 |           65536 =  16⁴ |      1.6 secs |
-|   5 |         1048576 =  16⁵ |       26 secs |
-|   6 |        16777216 =  16⁶ |        7 mins |
+|   4 |           65536 =  16⁴ |      1.5 secs |
+|   5 |         1048576 =  16⁵ |       24 secs |
+|   6 |        16777216 =  16⁶ |        6 mins |
 |   7 |       268435456 =  16⁷ |       2 hours |
 |   8 |      4294967296 =  16⁸ |        1 days |
-|   9 |     68719476736 =  16⁹ |       19 days |
-|  10 |   1099511627776 = 16¹⁰ |      310 days |
-|  11 |  17592186044416 = 16¹¹ |      14 years |
-|  12 | 281474976710656 = 16¹² |     218 years |
+|   9 |     68719476736 =  16⁹ |       18 days |
+|  10 |   1099511627776 = 16¹⁰ |      293 days |
+|  11 |  17592186044416 = 16¹¹ |      13 years |
+|  12 | 281474976710656 = 16¹² |     205 years |
 
 As you can see, anything above 10 fixed digits is pretty much unfeasible, at least with a normal
 personal computer.

src/lib.rs

@@ -28,6 +28,12 @@ use sequoia_openpgp::{
 
 type SecretKey = Key<SecretParts, PrimaryRole>;
 
+#[allow(clippy::large_enum_variant)]
+enum Message {
+    Key(SecretKey),
+    Stop,
+}
+
 #[derive(Clone, Debug)]
 pub struct Config {
     pub regex: Regex,
@@ -63,54 +69,71 @@ impl Fingerprunk {
         }
     }
 
-    pub fn run(mut self) {
+    pub fn run(mut self) -> anyhow::Result<()> {
         self.started_instant = Instant::now();
 
-        let (tx, rx) = mpsc::channel();
+        let (sender, receiver) = mpsc::channel();
+
+        {
+            let sender = sender.clone();
+            ctrlc::set_handler(move || {
+                let _ = sender.send(Message::Stop);
+            })?;
+        }
 
         thread::scope(|scope| {
-            const THREAD_SPAWN_EXPECT_MSG: &str = "should be able to spawn thread";
-
             let ref_self = &self;
 
             let status_displayer = if self.config.status_enabled {
                 Some(
                     thread::Builder::new()
                         .name("status_displayer".to_string())
-                        .spawn_scoped(scope, move || ref_self.status_displayer_thread())
-                        .expect(THREAD_SPAWN_EXPECT_MSG),
+                        .spawn_scoped(scope, move || ref_self.status_displayer_thread())?,
                 )
             } else {
                 None
             };
 
             for num in 0..num_cpus::get() {
-                let tx = tx.clone();
+                let sender = sender.clone();
 
                 thread::Builder::new()
                     .name(format!("worker-{num:03}"))
-                    .spawn_scoped(scope, move || ref_self.worker_thread(tx))
-                    .expect(THREAD_SPAWN_EXPECT_MSG);
+                    .spawn_scoped(scope, move || ref_self.worker_thread(sender))?;
+            }
+
+            let mut stdout = io::stdout().lock();
+
+            // Receive and process messages from the workers and the ctrl-c handler
+            for message in receiver {
+                match message {
+                    Message::Key(key) => {
+                        let cert = self.key_to_cert(&key)?;
+                        self.serialize_cert(cert, &mut stdout)?;
+
+                        // Increase "found" counter and stop if enough matches have been found
+                        let prev = self.counter_found.fetch_add(1, Ordering::Relaxed);
+                        if self.config.stop_after.is_some_and(|s| prev + 1 == s.get()) {
+                            break;
+                        }
+                    }
+                    Message::Stop => break,
+                }
             }
 
-            let on_stop = || {
             // Ask all other threads to stop
             self.stop.store(true, Ordering::Relaxed);
 
-                // Unpark the status displayer thread
+            // Unpark the status displayer thread, if existant
             if let Some(status_displayer) = status_displayer {
                 status_displayer.thread().unpark();
             }
-            };
 
-            thread::Builder::new()
-                .name("finalizer".to_string())
-                .spawn_scoped(scope, move || ref_self.finalizer_thread(rx, on_stop))
-                .expect(THREAD_SPAWN_EXPECT_MSG);
-        });
+            Ok(())
+        })
     }
 
-    fn worker_thread(&self, matches_tx: mpsc::Sender<SecretKey>) {
+    fn worker_thread(&self, sender: mpsc::Sender<Message>) {
         let mut fingerprint_hex = String::with_capacity(20 * 2);
 
         while !self.stop.load(Ordering::Relaxed) {
@@ -120,8 +143,8 @@ impl Fingerprunk {
             write!(fingerprint_hex, "{:X}", key.fingerprint())
                 .expect("should write into string without error");
             if self.check_fingerprint(&fingerprint_hex) {
-                matches_tx
-                    .send(Key::V4(key))
+                sender
+                    .send(Message::Key(Key::V4(key)))
                     .expect("should be able to send key");
             }
             self.counter_tried.fetch_add(1, Ordering::Relaxed);
@@ -136,27 +159,6 @@ impl Fingerprunk {
             .expect("should check regex without error")
     }
 
-    fn finalizer_thread(&self, matches_rx: mpsc::Receiver<SecretKey>, on_stop: impl FnOnce()) {
-        let mut stdout = io::stdout().lock();
-
-        for key in matches_rx {
-            let cert = self
-                .key_to_cert(&key)
-                .expect("should be able to create certificate");
-
-            self.serialize_cert(cert, &mut stdout)
-                .expect("should be able to serialize certificate");
-
-            let prev = self.counter_found.fetch_add(1, Ordering::Relaxed);
-
-            if self.config.stop_after.is_some_and(|s| prev + 1 == s.get()) {
-                break;
-            }
-        }
-
-        on_stop();
-    }
-
     fn key_to_cert(&self, key: &SecretKey) -> anyhow::Result<Cert> {
         let sig = SignatureBuilder::new(SignatureType::DirectKey)
             .set_hash_algo(HashAlgorithm::SHA512)

src/main.rs

@@ -89,7 +89,7 @@ fn main() -> anyhow::Result<()> {
         password,
     };
 
-    Fingerprunk::new_from_config(config).run();
+    Fingerprunk::new_from_config(config).run()?;
 
     Ok(())
 }