S3 multipart uploads seem difficult to verify about fs2-aws HOT 3 CLOSED

Hello. I'm not sure that the digest you calculated in your example would be the same as 'checksum-of-checksums'. i think we should calculate digest inside uploader for each part and make it part of the result and do the validation once all parts are done. i think you suggested it in one of your options

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@semenodm You're right, I was not clear enough. AWS takes those digests, concatenates them, takes their MD5, prints to hex and then appends the number of chunks, e.g. "...-3". The problem is that I need to 'split' the stream to do the two 'folds', e.g. one which 'folds' the chunks down to S3 and one which 'folds' them down to the expected final ETag.

I'll edit my comments above.

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Closing it, since @BusyByte implemented the checksum validation

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