On the other hand, doing both the simple and relaxed body hashes in a pass
over the body would handle about 99.999% of the signatures that anyone
cares about. ...
New improved answer: if you've taken my pipelining suggestion and
checked the DKIM signatures as soon as you see the end of the header,
you already know exactly what body hashes you need, so you can do
exactly those in one pass over the body.
R's,
John
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