used a different way to split the block into 32 bits

[Ozzy-ZY]

I did this because the bitwise operations maybe not very readable specially for beginners

• I have performed a self-review of my code
• My code follows the style guidelines of this project
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Comments in areas I changed are up to date
• I have added comments to hard-to-understand areas of my code
• I have made corresponding changes to the README.md

[siriak]

I think that in this case the bitwise operations are pretty simple, we are just taking half of the bits. While it's true that absolute beginners might not know about how bitwise operations work, but they might also not know how BitConverter works. The approach with BitConverter seems more complicated to me, so I prefer to leave bit operations in place here. Besides, there are more complicated bitwise operations in this file, so the reader must understand them anyway.