Backport Bitcoin PR#8822: net: Consistent checksum handling #1565
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This is backport of Bitcoin PR bitcoin#8822.
This is the last PR I'm sending before
main.{h,cpp}
split.The original PR description follows.
In principle, the checksums of P2P packets are simply 4-byte blobs which are the first bytes of SHA256(SHA256(payload)).
Currently they are handled as little-endian 32-bit integers half of the time, as blobs the other half, sometimes copying the one to the other, resulting in somewhat confused code.
This PR changes the handling to be consistent both at packet creation and receiving, making it (I think) easier to understand.