John Levine wrote: > Assuming you make the generally useful optimization to do
> the body hash only once, it's hard to see a significant > load from an extra signature check. +1. But a body hash is calculated per signature because it might have a different c14n parsing. So the ideal optimization would be to reduce the body hashing to unique c= c14n types. Given a ridiculous multiple signatures case: DKIM-Signature: .... c=relaxed/relaxed; // dupe DKIM-Signature: .... c=relaxed/relaxed; // dupe DKIM-Signature: .... c=relaxed/relaxed; // dupe DKIM-Signature: .... c=simple/relaxed; // other signer DKIM-Signature: .... c=relaxed/relaxed; // other signer A reduction consideration with body hash calculations per signature c14n type has some merit when mail size is a consideration. In this case, a minimum of two calculations are necessary. -- HLS _______________________________________________ NOTE WELL: This list operates according to http://mipassoc.org/dkim/ietf-list-rules.html
