Add codes for MD5(IP) distribution

codes/md5-dist/src/main.rs

@@ -0,0 +1,28 @@
+use md5::{Digest, Md5};
+use std::{
+    collections::HashMap,
+    fs::File,
+    io::{BufWriter, Write},
+};
+
+fn main() -> std::io::Result<()> {
+    let mut map = HashMap::new();
+    for i in 0u32..=std::u32::MAX {
+        let mut hasher = Md5::new();
+        hasher.update(i.to_le_bytes());
+        let out = hasher.finalize();
+        let key = out[out.len() - 1];
+        *map.entry(key).or_insert(0) += 1;
+        if i % 100_000 == 0 {
+            println!("{i}");
+        }
+    }
+    let mut count_list = map.into_iter().collect::<Vec<_>>();
+    count_list.sort();
+    let file = File::create("./countmap.txt")?;
+    let mut writer = BufWriter::new(file);
+    for (k, v) in count_list {
+        writeln!(writer, "{:02x}: {}", k, v)?;
+    }
+    Ok(())
+}

codes/md5-dist/src/main.rs_all_ips_bak

@@ -0,0 +1,21 @@
+use md5::{Digest, Md5};
+use std::{
+    fs::File,
+    io::{BufWriter, Write},
+};
+
+fn main() -> std::io::Result<()> {
+    let file = File::create("./hashes.txt")?;
+    let mut writer = BufWriter::new(file);
+    for i in 0u32..=std::u32::MAX {
+        let mut hasher = Md5::new();
+        // let mut out = [0; 16];
+        hasher.update(i.to_le_bytes());
+        let out = hasher.finalize();
+        writeln!(writer, "{:02x}", out[out.len() - 1])?;
+        if i % 100_000 == 0 {
+            println!("{i}");
+        }
+    }
+    Ok(())
+}