commit f851cd71be773295a075b9cbeac07488934a3886
Author: Aadi Desai <21363892+supleed2@users.noreply.github.com>
Date:   Sun May 7 17:31:17 2023 +0100

    Initial commit
    
    Basic version of program, 1 namehash at a time

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
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diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..cc1ab85
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,343 @@
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..9e1c725
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "namehash"
+version = "0.1.0"
+edition = "2021"
+description = "CLI program for hashing domain names according to EIP-137"
+homepage = "https://github.com/supleed2/namehash-rs"
+license = "Apache-2.0"
+repository = "https://github.com/supleed2/namehash-rs"
+# documentation = ""
+# keywords = []
+# categories = []
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+clap = { version = "4.2.7", features = ["derive"] }
+hex = "0.4.3"
+tiny-keccak = { version = "2.0.2", features = ["keccak"] }
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..98fcbb8
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,113 @@
+// use std::path::PathBuf;
+
+use clap::{Parser, Subcommand};
+
+#[derive(Parser)]
+struct Cli {
+    #[command(subcommand)]
+    command: Commands,
+}
+
+#[derive(Subcommand)]
+enum Commands {
+    /// Get the namehash of a single domain
+    Domain {
+        /// Domain to get namehash of
+        domain: String,
+    },
+    // /// Get the namehashes of many domains at once, THIS COMMAND IS INCOMPLETE
+    // File {
+    //     /// Path to input file, domains to hash with 1 per line
+    //     input: PathBuf,
+    //     /// File to save hashes to, stdout if not given
+    //     #[arg(short, long, value_name = "FILE")]
+    //     output: Option<PathBuf>,
+    // },
+}
+
+fn main() {
+    match Cli::parse().command {
+        Commands::Domain { domain } => println!("{domain}: 0x{}", hex::encode(namehash(&domain))),
+        // Commands::File { input, output } => match output {
+        //     None => println!(
+        //         "Hashing domains in {}, output to stdout, THIS COMMAND IS INCOMPLETE",
+        //         input.display()
+        //     ),
+        //     Some(output) => println!(
+        //         "Hashing domains in {}, output to {}, THIS COMMAND IS INCOMPLETE",
+        //         input.display(),
+        //         output.display()
+        //     ),
+        // },
+    }
+}
+
+fn keccak256(bytes: &[u8]) -> [u8; 32] {
+    use tiny_keccak::{Hasher, Keccak};
+    let mut hasher = Keccak::v256();
+    hasher.update(bytes);
+    let mut hash = [0u8; 32];
+    hasher.finalize(&mut hash);
+    hash
+}
+
+fn namehash(name: &str) -> Vec<u8> {
+    if name.is_empty() {
+        return vec![0u8; 32];
+    }
+    let mut hash = vec![0u8; 32];
+    for label in name.rsplit(".") {
+        hash.append(&mut keccak256(label.as_bytes()).to_vec());
+        hash = keccak256(hash.as_slice()).to_vec();
+    }
+    hash
+}
+
+#[cfg(test)]
+mod test {
+    use super::namehash;
+
+    #[test]
+    fn test_namehash() {
+        // Test cases, same than used @ EIP137 `https://github.com/ethereum/EIPs/blob/master/EIPS/eip-137.md`
+        let cases = vec![
+            (
+                "",
+                &[
+                    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                    0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                ],
+            ),
+            (
+                "crypto",
+                &[
+                    0x0f, 0x4a, 0x10, 0xa4, 0xf4, 0x6c, 0x28, 0x8c, 0xea, 0x36, 0x5f, 0xcf, 0x45,
+                    0xcc, 0xcf, 0x0e, 0x9d, 0x90, 0x1b, 0x94, 0x5b, 0x98, 0x29, 0xcc, 0xdb, 0x54,
+                    0xc1, 0x0d, 0xc3, 0xcb, 0x7a, 0x6f,
+                ],
+            ),
+            (
+                "eth",
+                &[
+                    0x93, 0xcd, 0xeb, 0x70, 0x8b, 0x75, 0x45, 0xdc, 0x66, 0x8e, 0xb9, 0x28, 0x1,
+                    0x76, 0x16, 0x9d, 0x1c, 0x33, 0xcf, 0xd8, 0xed, 0x6f, 0x4, 0x69, 0xa, 0xb,
+                    0xcc, 0x88, 0xa9, 0x3f, 0xc4, 0xae,
+                ],
+            ),
+            (
+                "foo.eth",
+                &[
+                    0xde, 0x9b, 0x9, 0xfd, 0x7c, 0x5f, 0x90, 0x1e, 0x23, 0xa3, 0xf1, 0x9f, 0xec,
+                    0xc5, 0x48, 0x28, 0xe9, 0xc8, 0x48, 0x53, 0x98, 0x1, 0xe8, 0x65, 0x91, 0xbd,
+                    0x98, 0x1, 0xb0, 0x19, 0xf8, 0x4f,
+                ],
+            ),
+        ];
+
+        for (name, expected_namehash) in cases {
+            let namehash: &[u8] = &namehash(name);
+            assert_eq!(namehash, expected_namehash);
+        }
+    }
+}