Parallel Argon2id lanes (unlock 180 ms -> 129 ms, Go 122 ms); AEAD throughput probe

Co-Authored-By: Claude <noreply@anthropic.com>

benches/aead_probe.rs

@@ -0,0 +1,25 @@
+use chacha20poly1305::aead::{AeadInOut, KeyInit};
+use chacha20poly1305::{ChaCha20Poly1305, Key, Nonce};
+use std::time::Instant;
+fn main() {
+    let c = ChaCha20Poly1305::new(&Key::from([1u8; 32]));
+    let mut buf = vec![0u8; 64 * 1024];
+    let n = 1024; // 64 MiB
+    let t = Instant::now();
+    for i in 0..n {
+        let mut nb = [0u8; 12];
+        nb[3..11].copy_from_slice(&(i as u64).to_be_bytes());
+        std::hint::black_box(c.encrypt_inout_detached(&Nonce::from(nb), &[], buf.as_mut_slice().into()).unwrap());
+    }
+    let s = t.elapsed().as_secs_f64();
+    println!("raw seal: {:.0} MB/s", (n * 65536) as f64 / s / 1e6);
+    let key = [1u8; 32];
+    let data = vec![0u8; 64 << 20];
+    let t = Instant::now();
+    let mut out = Vec::with_capacity(data.len() + (1 << 20));
+    vault::crypto::stream::seal_all(&key, &data, &mut out);
+    println!("seal_all: {:.0} MB/s", data.len() as f64 / t.elapsed().as_secs_f64() / 1e6);
+    let t = Instant::now();
+    let n = vault::crypto::stream::open_all(&key, &mut out).unwrap();
+    println!("open_all: {:.0} MB/s ({n})", data.len() as f64 / t.elapsed().as_secs_f64() / 1e6);
+}