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Backport Bitcoin PR#8822: net: Consistent checksum handling (#1565)
* net: Consistent checksum handling In principle, the checksums of P2P packets are simply 4-byte blobs which are the first four 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. * net: Hardcode protocol sizes and use fixed-size types The P2P network uses a fixed protocol, these sizes shouldn't change based on what happens to be the architecture.
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