release version 0.2.1

use a bounded channel and fix panic in race condition
release version 0.2.0
2026-08-15 00:16:47 +02:00 · 2025-11-01 09:42:39 +01:00 · 2025-11-01 09:40:42 +01:00 · 2025-10-25 19:32:59 +02:00 · 2025-10-25 19:28:58 +02:00 · 2025-10-25 18:54:40 +02:00
5 changed files with 243 additions and 180 deletions
@@ -10,9 +10,9 @@ checksum = "320119579fcad9c21884f5c4861d16174d0e06250625266f50fe6898340abefa"

 [[package]]
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@@ -231,9 +240,9 @@ dependencies = [

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+[[package]]
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+ "nix",
+ "windows-sys 0.61.2",
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+[[package]]
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+ "libc",
+ "objc2",
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 [[package]]
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 dependencies = [
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+ "ctrlc",
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+ "cfg_aliases",
+ "libc",
+]
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+[[package]]
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 dependencies = [
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+ "generic-array 1.3.5",
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 [[package]]
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 "wasm-bindgen-shared",
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 dependencies = [
 "yoke",
 "zerofrom",
@@ -1842,9 +1859,9 @@ dependencies = [

 [[package]]
 name = "zerovec-derive"
-version = "0.11.1"
+version = "0.11.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5b96237efa0c878c64bd89c436f661be4e46b2f3eff1ebb976f7ef2321d2f58f"
+checksum = "eadce39539ca5cb3985590102671f2567e659fca9666581ad3411d59207951f3"
 dependencies = [
 "proc-macro2",
 "quote",
@@ -1,6 +1,6 @@
 [package]
 name = "fingerprunk"
-version = "0.1.0"
+version = "0.2.1"
 authors = ["Niklas Elsbrock <mail@nelsbrock.de>"]
 edition = "2024"
 description = "CLI tool for brute-forcing OpenPGP keys with cool fingerprints"
@@ -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"
@@ -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.
@@ -2,10 +2,11 @@

 use std::{
    fmt::{self, Write},
-    io::{self},
+    io,
+    num::NonZeroU64,
    sync::{
-        atomic::{AtomicU64, Ordering},
-        mpsc::{self, Receiver},
+        atomic::{AtomicBool, AtomicU64, Ordering},
+        mpsc,
    },
    thread,
    time::{Duration, Instant},
@@ -27,16 +28,25 @@ 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,
    pub status_enabled: bool,
+    pub stop_after: Option<NonZeroU64>,
    pub password: Option<Password>,
 }

 #[derive(Debug)]
 pub struct Fingerprunk {
    config: Config,
+    started_instant: Instant,
+    stop: AtomicBool,
    counter_tried: AtomicU64,
    counter_found: AtomicU64,
 }
@@ -52,55 +62,90 @@ impl Fingerprunk {
    pub fn new_from_config(config: Config) -> Self {
        Self {
            config,
+            started_instant: Instant::now(),
+            stop: AtomicBool::new(false),
            counter_tried: AtomicU64::new(0),
            counter_found: AtomicU64::new(0),
        }
    }

-    pub fn run(self) {
-        let (tx, rx) = mpsc::channel();
+    pub fn run(mut self) -> anyhow::Result<()> {
+        self.started_instant = Instant::now();
+
+        let (sender, receiver) = mpsc::sync_channel(16);
+
+        {
+            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;

-            if self.config.status_enabled {
-                thread::Builder::new()
-                    .name("status_displayer".to_string())
-                    .spawn_scoped(scope, move || ref_self.status_displayer_thread())
-                    .expect(THREAD_SPAWN_EXPECT_MSG);
-            }
+            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())?,
+                )
+            } 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))?;
            }

-            thread::Builder::new()
-                .name("finalizer".to_string())
-                .spawn_scoped(scope, move || ref_self.finalizer_thread(rx))
-                .expect(THREAD_SPAWN_EXPECT_MSG);
-        });
+            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,
+                }
+            }
+
+            // Ask all other threads to stop
+            self.stop.store(true, Ordering::Relaxed);
+
+            // Unpark the status displayer thread, if existant
+            if let Some(status_displayer) = status_displayer {
+                status_displayer.thread().unpark();
+            }
+
+            Ok(())
+        })
    }

-    fn worker_thread(&self, matches_tx: mpsc::Sender<SecretKey>) {
+    fn worker_thread(&self, sender: mpsc::SyncSender<Message>) {
        let mut fingerprint_hex = String::with_capacity(20 * 2);

-        loop {
+        while !self.stop.load(Ordering::Relaxed) {
            let key =
                Key4::generate_ecc(true, Curve::Ed25519).expect("should be able to generate key");
            fingerprint_hex.clear();
            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))
-                    .expect("should be able to send key");
+                // The channel might already be closed here if we're stopping.
+                // That is fine, so we just ignore the error.
+                let _ = sender.send(Message::Key(Key::V4(key)));
            }
            self.counter_tried.fetch_add(1, Ordering::Relaxed);
        }
@@ -114,21 +159,6 @@ impl Fingerprunk {
            .expect("should check regex without error")
    }

-    fn finalizer_thread(&self, matches_rx: Receiver<SecretKey>) {
-        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");
-
-            self.counter_found.fetch_add(1, Ordering::Relaxed);
-        }
-    }
-
    fn key_to_cert(&self, key: &SecretKey) -> anyhow::Result<Cert> {
        let sig = SignatureBuilder::new(SignatureType::DirectKey)
            .set_hash_algo(HashAlgorithm::SHA512)
@@ -181,6 +211,21 @@ impl Fingerprunk {
    }

    fn status_displayer_thread(&self) {
+        const UPDATE_INTERVAL: Duration = Duration::from_millis(250);
+
+        eprint!("\n\n\n\n\n");
+
+        while !self.stop.load(Ordering::Relaxed) {
+            self.print_status();
+            // We are parking the thread instead of sleeping so we can unpark it when we want to
+            // stop the program.
+            thread::park_timeout(UPDATE_INTERVAL);
+        }
+
+        self.print_status();
+    }
+
+    fn print_status(&self) {
        struct DurationDhms(Duration);

        impl fmt::Display for DurationDhms {
@@ -194,28 +239,20 @@ impl Fingerprunk {
            }
        }

-        const UPDATE_INTERVAL: Duration = Duration::from_millis(250);
        const FORMAT_WIDTH: usize = 12;

-        let start = Instant::now();
-
-        eprint!("\n\n\n\n\n");
-
-        loop {
-            let duration = DurationDhms(start.elapsed());
-            let keys = self.counter_tried.load(Ordering::Relaxed);
-            let keys_per_sec = keys as f64 / duration.0.as_secs_f64();
-            let found = self.counter_found.load(Ordering::Relaxed);
-            eprint!(
-                "\x1b[F\x1b[F\x1b[F\x1b[F\x1b[F\
+        let duration = DurationDhms(self.started_instant.elapsed());
+        let keys = self.counter_tried.load(Ordering::Relaxed);
+        let keys_per_sec = keys as f64 / duration.0.as_secs_f64();
+        let found = self.counter_found.load(Ordering::Relaxed);
+        eprint!(
+            "\x1b[F\x1b[F\x1b[F\x1b[F\x1b[F\
                Time:  {duration}\n\
                Tried: {keys: >w$} keys\n\
                Rate:  {keys_per_sec: >w$.0} keys/s\n\
                ---\n\
                Found: {found: >w$} keys\n",
-                w = FORMAT_WIDTH
-            );
-            thread::sleep(UPDATE_INTERVAL);
-        }
+            w = FORMAT_WIDTH
+        );
    }
 }
@@ -1,4 +1,7 @@
-use std::io::{self, IsTerminal};
+use std::{
+    io::{self, IsTerminal},
+    num::NonZeroU64,
+};

 use anyhow::{Context as AnyhowContext, anyhow};
 use clap::{ArgAction, Parser, ValueEnum};
@@ -26,6 +29,10 @@ struct Args {
    #[arg(long, value_enum, default_value_t)]
    status: StatusEnabled,

+    /// Stop once the specified number of matching keys has been found.
+    #[arg(long)]
+    stop_after: Option<NonZeroU64>,
+
    /// Prompt for a password and use it to encrypt found keys.
    ///
    /// By default, found keys are printed to stdout unencrypted. Use this if you actually plan to
@@ -78,10 +85,11 @@ fn main() -> anyhow::Result<()> {
    let config = fingerprunk::Config {
        regex: args.regex,
        status_enabled: args.status.evaluate(),
+        stop_after: args.stop_after,
        password,
    };

-    Fingerprunk::new_from_config(config).run();
+    Fingerprunk::new_from_config(config).run()?;

    Ok(())
 }
Author	SHA1	Message	Date
nelsbrock	fe984f2e43	release version 0.2.1	2025-11-01 09:42:39 +01:00
nelsbrock	b1450070d1	use a bounded channel and fix panic in race condition	2025-11-01 09:40:42 +01:00
nelsbrock	241fecd8a7	release version 0.2.0	2025-10-25 19:32:59 +02:00
nelsbrock	273c1059a2	fix README.md	2025-10-25 19:28:58 +02:00
nelsbrock	1f659c33a7	stop gracefully on ctrl-c	2025-10-25 18:54:40 +02:00
nelsbrock	561a4d220b	add `--stop-after` option	2025-10-25 13:53:38 +02:00