[Cyberduck-trac] [Cyberduck] #9733: Add SHA1 or other verification for BackBlaze B2

[Cyberduck]

#9733: Add SHA1 or other verification for BackBlaze B2
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 Reporter:  cyborgduck        |         Owner:
     Type:  defect            |        Status:  new
 Priority:  normal            |     Milestone:
Component:  core              |       Version:  5.1
 Severity:  normal            |    Resolution:
 Keywords:  sha backblaze b2  |  Architecture:
 Platform:                    |
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Changes (by cyborgduck):

 * version:   => 5.1


Comment:

 I checked the source for b2 meanwhile but I can only see that the code
 retrieves the SHA1 that Backblaze gives, and parses it.[[br]]
 But I see no chunk where it would calculate the local files. The transfer
 also starts way too quickly.[[br]]
 On a Xeon 1245v2, a 4gb file starts to upload within mere seconds. I doubt
 SHA1 can be calculated that fast.[[br]][[br]]

 7-zip's SHA1 calculation takes 22 seconds on the same machine.[[br]]
 So something is fishy.[[br]][[br]]

 I also read the wiki about the Synchronize feature that SHA comparison is
 supported for S3.[[br]]
 But S3 for Reduced Availability says _you will lose files_. Now that's not
 that appealing.[[br]]
 B2 is cheaper, and more redundant.

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Ticket URL: <https://trac.cyberduck.io/ticket/9733#comment:2>
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