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[flutter_tools] verify checksum of downloaded artifacts (#67839)
All of the network requests from google cloud storage include an x-goog-hash header which contains an MD5 checksum. If present, use to validate that the downloaded binary is valid. This will rule out corrupt files as the cause of getting started crashers in the flutter_tool. #38980 This does not fully resolve the above issue, because while we can check if the checksum matches what was expected from cloud storage, this A) may not necessarily be present and B) may not match up to what should be uploaded as part of the engine build process. But when life gives you lemons you hash those lemons using an outdated hashing algorithm.
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