release version 0.2.0

Cargo.lock

@@ -231,9 +231,9 @@ dependencies = [
 
 [[package]]
 name = "cc"
-version = "1.2.41"
+version = "1.2.43"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ac9fe6cdbb24b6ade63616c0a0688e45bb56732262c158df3c0c4bea4ca47cb7"
+checksum = "739eb0f94557554b3ca9a86d2d37bebd49c5e6d0c1d2bda35ba5bdac830befc2"
 dependencies = [
  "find-msvc-tools",
  "shlex",
@@ -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"
@@ -469,10 +492,11 @@ checksum = "52051878f80a721bb68ebfbc930e07b65ba72f2da88968ea5c06fd6ca3d3a127"
 
 [[package]]
 name = "fingerprunk"
-version = "0.1.0"
+version = "0.2.0"
 dependencies = [
  "anyhow",
  "clap",
+ "ctrlc",
  "fancy-regex",
  "num-integer",
  "num_cpus",
@@ -488,9 +512,9 @@ checksum = "0ce7134b9999ecaf8bcd65542e436736ef32ddca1b3e06094cb6ec5755203b80"
 
 [[package]]
 name = "flate2"
-version = "1.1.4"
+version = "1.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dc5a4e564e38c699f2880d3fda590bedc2e69f3f84cd48b457bd892ce61d0aa9"
+checksum = "bfe33edd8e85a12a67454e37f8c75e730830d83e313556ab9ebf9ee7fbeb3bfb"
 dependencies = [
  "crc32fast",
  "miniz_oxide",
@@ -508,9 +532,9 @@ dependencies = [
 
 [[package]]
 name = "generic-array"
-version = "1.3.4"
+version = "1.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "985a5578ebdb02351d484a77fb27e7cb79272f1ba9bc24692d8243c3cfe40660"
+checksum = "eaf57c49a95fd1fe24b90b3033bee6dc7e8f1288d51494cb44e627c295e38542"
 dependencies = [
  "rustversion",
  "typenum",
@@ -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"
@@ -1010,9 +1046,9 @@ checksum = "925383efa346730478fb4838dbe9137d2a47675ad789c546d150a6e1dd4ab31c"
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.101"
+version = "1.0.103"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "89ae43fd86e4158d6db51ad8e2b80f313af9cc74f5c0e03ccb87de09998732de"
+checksum = "5ee95bc4ef87b8d5ba32e8b7714ccc834865276eab0aed5c9958d00ec45f49e8"
 dependencies = [
  "unicode-ident",
 ]
@@ -1212,7 +1248,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1f606421e4a6012877e893c399822a4ed4b089164c5969424e1b9d1e66e6964b"
 dependencies = [
  "digest",
- "generic-array 1.3.4",
+ "generic-array 1.3.5",
 ]
 
 [[package]]
@@ -1271,9 +1307,9 @@ checksum = "13c2bddecc57b384dee18652358fb23172facb8a2c51ccc10d74c157bdea3292"
 
 [[package]]
 name = "syn"
-version = "2.0.107"
+version = "2.0.108"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2a26dbd934e5451d21ef060c018dae56fc073894c5a7896f882928a76e6d081b"
+checksum = "da58917d35242480a05c2897064da0a80589a2a0476c9a3f2fdc83b53502e917"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1382,9 +1418,9 @@ checksum = "562d481066bde0658276a35467c4af00bdc6ee726305698a55b86e61d7ad82bb"
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.19"
+version = "1.0.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f63a545481291138910575129486daeaf8ac54aee4387fe7906919f7830c7d9d"
+checksum = "462eeb75aeb73aea900253ce739c8e18a67423fadf006037cd3ff27e82748a06"
 
 [[package]]
 name = "unicode-xid"

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "fingerprunk"
-version = "0.1.0"
+version = "0.2.0"
 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"

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

@@ -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,
 }
@@ -52,54 +62,89 @@ 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::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;
 
-            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::Sender<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))
+                sender
+                    .send(Message::Key(Key::V4(key)))
                     .expect("should be able to send 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
+        );
     }
 }

src/main.rs

@@ -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(())
 }