Unsound usages of unsafe implementation from `[u8]` to `u64`

[llooFlashooll]

Hi, I am scanning the t1ha in the latest version with my own static analyzer tool.

Unsafe conversion found at: /src/t1ha1.rs#L58

    let mut v = data.as_ptr() as *const u64;

    if unlikely(len > 32) {
            ...

This unsound implementation would create a misalignment issues if the type size of [u8] is smaller than the type size of u64.

The problematic value is further manipulated at: /src/t1ha1.rs#L66-69

      let w0 = T::fetch(v.offset(0));
      let w1 = T::fetch(v.offset(1));
      let w2 = T::fetch(v.offset(2));
      let w3 = T::fetch(v.offset(3));

This would potentially cause undefined behaviors in Rust. If we further manipulate the problematic converted types, it would potentially lead to different consequences such as access out-of-bound. I am reporting this issue for your attention.