feat(solver-wasm): add basic wasm solver impl

.editorconfig

@@ -9,3 +9,6 @@ end_of_line = lf
 charset = utf-8
 trim_trailing_whitespace = true
 insert_final_newline = true
+
+[*.rs]
+indent_style = space

.gitignore

@@ -4,3 +4,5 @@
 /pkgs/*/node_modules/
 /pkgs/*/dist/
 /pkgs/*/.turbo/
+
+/pkgs/solver-wasm/target/

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pkgs/solver-wasm/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "solver-wasm"
+version = "0.0.0"
+edition = "2024"
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+wasm-bindgen = "0.2"
+sha2 = "0.10"

pkgs/solver-wasm/package.json

@@ -0,0 +1,6 @@
+{
+	"private": true,
+	"scripts": {
+		"build": "wasm-pack build --out-dir 'dist' --scope 'pow-captcha'"
+	}
+}

pkgs/solver-wasm/src/lib.rs

@@ -0,0 +1,30 @@
+use sha2::{Digest, Sha256};
+use wasm_bindgen::prelude::*;
+
+#[wasm_bindgen]
+pub fn solve(nonce: &[u8], target: &[u8]) -> Box<[u8]> {
+    let mut buf = vec![0u8; 8 + nonce.len()];
+    buf[8..].copy_from_slice(nonce);
+
+    for i in 0u64.. {
+        let i_bytes = u64::to_le_bytes(i);
+        buf[0..=7].copy_from_slice(&i_bytes);
+        let hash = Sha256::digest(&buf);
+        if &hash[0..target.len()] == target {
+            return i_bytes.into();
+        }
+    }
+
+    unreachable!();
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn solve() {
+        assert_eq!(
+            super::solve(&[1, 2], &[3, 4]).as_ref(),
+            [45, 176, 0, 0, 0, 0, 0, 0]
+        );
+    }
+}