The first step of the manipulation was to make changes to the MIME
structure that were canonicalized away by nowsp -- hence rendering
parts of the signed message invisible without breaking the
signature.
A premise to the wsp optimizations is that they do not affect the structure of
the message. So canonicalization of wsp is only for that has no structural
impact. For example, wsp at the beginning of a line in the rfc2822 header has
very big structural impact because it means the line is a continuation of the
previous line's header field.
In other words, the reference "line folding" for canonicalization is really a
rule about structure-related processing, as distinct from "data-related"
processing.
I think think means that the manipulation you cite with regards to MIME
delimiters is to require canonicalization to be aware of MIME structure
constructs and to make sure that they are preserved?
d/
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Dave Crocker
Brandenburg InternetWorking
+1.408.246.8253
dcrocker a t ...
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