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See https://docs.aws.amazon.com/AmazonS3/latest/userguide/checking-object-integrity.html for some background. This covers both "normal" objects and part-uploads for MPUs. Note that because we don't write down any client-provided checksums during initiate-MPU calls, we can't do any verification during complete-MPU calls. crc64nvme checksums are not yet supported; clients attempting to use them will get back 501s. Adds crt as a boto3 extra to test-requirements. The extra lib provides crc32c and crc64nvme checksum support in boto3. Co-Authored-By: Ashwin Nair <ashnair@nvidia.com> Co-Authored-By: Alistair Coles <alistairncoles@gmail.com> Signed-off-by: Tim Burke <tim.burke@gmail.com> Signed-off-by: Alistair Coles <alistairncoles@gmail.com> Change-Id: Id39fd71bc59875a5b88d1d012542136acf880019