1 files changed, 46 insertions, 0 deletions
diff --git a/2015/rs/src/four.rs b/2015/rs/src/four.rs
new file mode 100644
index 0000000..177ddc5
--- /dev/null
+++ b/2015/rs/src/four.rs
@@ -0,0 +1,46 @@
+use md5::{Digest, Md5};
+use std::fmt::Write;
+use std::io::Write as WriteI;
+
+static INPUT: &'static [u8] = b"yzbqklnj";
+
+fn main() {
+  let mut buf = Vec::with_capacity(INPUT.len() + 10);
+  buf.extend_from_slice(INPUT);
+
+  for i in 0.. {
+    if i % 1000 == 0 { print!("{i}\r"); std::io::stdout().flush(); }
+
+    let mut hasher = Md5::new();
+    write!(&mut buf, "{i}");
+    hasher.update(buf.as_slice());
+    let hash = hasher.finalize();
+    if hash.starts_with(&[0, 0]) && hash[2] < 16 {
+      let mut hexhash = String::with_capacity(32);
+      for digit in hash {
+        write!(&mut hexhash, "{digit:02x}");
+      }
+      println!("Got 5 digit hash: {hexhash}, at {i}");
+      break;
+    }
+    buf.truncate(INPUT.len());
+  }
+
+  for i in 0.. {
+    if i % 1000 == 0 { print!("{i}\r"); std::io::stdout().flush(); }
+
+    let mut hasher = Md5::new();
+    write!(&mut buf, "{i}");
+    hasher.update(buf.as_slice());
+    let hash = hasher.finalize();
+    if hash.starts_with(&[0, 0, 0]) {
+      let mut hexhash = String::with_capacity(32);
+      for digit in hash {
+        write!(&mut hexhash, "{digit:02x}");
+      }
+      println!("Got 6 digit hash: {hexhash}, at {i}");
+      break;
+    }
+    buf.truncate(INPUT.len());
+  }
+}