wasm: add experimental argon2i checker

Signed-off-by: Xe Iaso <me@xeiaso.net>

wasm/pow/sha256/src/lib.rs

@@ -1,3 +1,4 @@
+use anubis::update_nonce;
 use sha2::{Digest, Sha256};
 use std::boxed::Box;
 use std::sync::{LazyLock, Mutex};
@@ -13,32 +14,18 @@ use std::sync::{LazyLock, Mutex};
 ///
 /// This is also functionally a write-only buffer, so it doesn't really matter that
 /// the length of this buffer isn't exposed.
-static DATA_BUFFER: LazyLock<Box<[u8; 4096]>> = LazyLock::new(|| Box::new([0; 4096]));
+pub static DATA_BUFFER: LazyLock<Box<[u8; 4096]>> = LazyLock::new(|| Box::new([0; 4096]));
 
-static DATA_LENGTH: LazyLock<Mutex<usize>> = LazyLock::new(|| Mutex::new(0));
+pub static DATA_LENGTH: LazyLock<Mutex<usize>> = LazyLock::new(|| Mutex::new(0));
 
 /// SHA-256 hashes are 32 bytes (256 bits). These are stored in static buffers due to the
 /// fact that you cannot easily pass data from host space to WebAssembly space.
-static RESULT_HASH: LazyLock<Box<Mutex<[u8; 32]>>> =
+pub static RESULT_HASH: LazyLock<Box<Mutex<[u8; 32]>>> =
     LazyLock::new(|| Box::new(Mutex::new([0; 32])));
 
-static VERIFICATION_HASH: LazyLock<Box<Mutex<[u8; 32]>>> =
+pub static VERIFICATION_HASH: LazyLock<Box<Mutex<[u8; 32]>>> =
     LazyLock::new(|| Box::new(Mutex::new([0; 32])));
 
-#[link(wasm_import_module = "anubis")]
-unsafe extern "C" {
-    /// The runtime expects this function to be defined. It is called whenever the Anubis check
-    /// worker processes about 1024 hashes. This can be a no-op if you want.
-    fn anubis_update_nonce(nonce: u32);
-}
-
-/// Safe wrapper to `anubis_update_nonce`.
-fn update_nonce(nonce: u32) {
-    unsafe {
-        anubis_update_nonce(nonce);
-    }
-}
-
 /// Core validation function. Compare each bit in the hash by progressively masking bits until
 /// some are found to not be matching.
 ///