On 4/1/21 1:50 PM, rapier wrote: > Howdy all, > > I know development on SCP is discouraged but being that it's still in wide use > I thought I would do some work some of my users have been asking for and allow > SCP to resume from a partial transfer. Would it be possible to instead reimplement SCP in terms of SFTP, and then add this feature to SFTP? My understanding is that such a re-implementation is something many people have wanted for quite a while. Of course, this might very well be out of scope for the project, which would be fine. > When enabled the resume function will compare the source and target files. The > source host will and target host will pass MD5 hashes back and forth in order > to compare the hash of the file fragment on the target and the file up to the > length of the source file. If these hashes match the source will seek to the > appropriate byte position and start sending the rest of the file. This will > then be appended to the target. I suggest using a better hash than MD5, which is considered broken. Blake2b is both faster and much more secure. Sincerely, Demi
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