I need a little code snippet and maybe if someone has time an explanation.
I have a hash function that I use using two different programming languages. The results are then compared in Rust.
What I want to get back is [3246643754, 1918081665, 2401493466, 600956609, 3662614728, 2858571937, 2319608302, 3673956376] so a vector of 8 u64 numbers. This is what the first usage of the hash function returns (I assume it is correct).
The same hash functions returns – used on a different part in the code –
[42, 218, 131, 193, 129, 154, 83, 114, 218, 225, 35, 143, 193, 222, 209, 35, 200, 16, 79, 218, 161, 88, 98, 170, 238, 105, 66, 138, 24, 32, 252, 218]
so an array of 32 numbers u8.
How can I now convert the latter into the former to compare them?
>Solution :
It looks like you’re casting big-endian u8s to u32 and then storing them as u64.
You can convert each slice of 4 u8s to u32 using u32::from_be_bytes, then cast to u64.
let num2: u64 = u64::from_be_bytes([193, 131, 218, 42]);