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wasm: move data buffer to library crate (DRY)

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Signed-off-by: Xe Iaso <me@xeiaso.net>
This commit is contained in:
Xe Iaso
2025-04-10 10:31:36 -04:00
parent d084b7f1a1
commit 33d31e03b0
3 changed files with 33 additions and 56 deletions
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wasm/pow/argon2id/src/lib.rs
+1 -28
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@@ -1,23 +1,8 @@
use anubis::update_nonce;
use anubis::{DATA_BUFFER, DATA_LENGTH, update_nonce};
use argon2::Argon2;
use std::boxed::Box;
use std::sync::{LazyLock, Mutex};
/// The data buffer is a bit weird in that it doesn't have an explicit length as it can
/// and will change depending on the challenge input that was sent by the server.
/// However, it can only fit 4096 bytes of data (one amd64 machine page). This is
/// slightly overkill for the purposes of an Anubis check, but it's fine to assume
/// that the browser can afford this much ram usage.
///
/// Callers should fetch the base data pointer, write up to 4096 bytes, and then
/// `set_data_length` the number of bytes they have written
///
/// This is also functionally a write-only buffer, so it doesn't really matter that
/// the length of this buffer isn't exposed.
pub static DATA_BUFFER: LazyLock<Box<[u8; 4096]>> = LazyLock::new(|| Box::new([0; 4096]));
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.
pub static RESULT_HASH: LazyLock<Mutex<[u8; 32]>> = LazyLock::new(|| Mutex::new([0; 32]));
@@ -189,15 +174,3 @@ pub extern "C" fn verification_hash_ptr() -> *const u8 {
pub extern "C" fn verification_hash_size() -> usize {
VERIFICATION_HASH.lock().unwrap().len()
}
#[unsafe(no_mangle)]
pub extern "C" fn data_ptr() -> *const u8 {
let challenge = &DATA_BUFFER;
challenge.as_ptr()
}
#[unsafe(no_mangle)]
pub extern "C" fn set_data_length(len: u32) {
let mut data_length = DATA_LENGTH.lock().unwrap();
*data_length = len as usize;
}