Function nanorand::entropy::rdseed_entropy

pub fn rdseed_entropy(amt: usize) -> Option<Result<Vec<u8>, Vec<u8>>>

An rdseed-based entropy source.
Only works on x86/x86_64 platforms where the rdseed instructions are available.
Returns None if rdseed is not available.
Returns Ok if it sucesfully managed to pull the requested amount of bytes.
Returns Err if it couldn't pull the requested amount of bytes.
VERY unreliable.