Re: [ftpext] I-D Action:draft-ietf-ftpext2-hash-00.txt

Richard Koenning <Richard.Koenning@ts.fujitsu.com> Wed, 05 January 2011 15:24 UTC

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Date: Wed, 05 Jan 2011 16:26:53 +0100
From: Richard Koenning <Richard.Koenning@ts.fujitsu.com>
Organization: Fujitsu Technology Solutions GmbH
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Subject: Re: [ftpext] I-D Action:draft-ietf-ftpext2-hash-00.txt
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Lothar Kimmeringer wrote:

> The data being used for calculating the hash MUST be the original
> data before any transformations take place (e.g. when transfering
> in ASCII mode)

The data on the server before the transformation isn't necessarily the 
same as the data on the client after undoing the transformation. E.g. 
regard systems with different EOL conventions (LF on Unix systems, CR on 
Mac OS (afaik), CR LF on Windows systems and even more complicated 
conventions on mainframe systems), the common denominator of the FTP 
partners is the data on the wire, therefore the data being used for 
calculating the hash MUST be the data after the transformations take 
place on the sending side and before the transformations take place on 
the receiving side (with the SIZE command we have already a similar 
situation with the same rule).
Best regards,
Richard
-- 
Dr. Richard W. Könning
Fujitsu Technology Solutions GmbH