On Mon, Jul 07, 2014, Dave Thompson wrote:

> 
> The only thing that springs to mind that could be invisible is string types
> and 
> some options of the cert Issuer fields vs the CA Subject. RFC 5280 requires
> a 
> fairly complicated Unicode-aware comparison algorithm which I believe
> openssl 
> does (it definitely canonicalizes before comparison, but I haven't gone
> through 
> the canonicalization to make sure it exactly matches the RFC); browsers
> might 
> not do the same (perhaps indirectly) although I'd be surprised if NONE do. 
> 

OpenSSL currently doesn't perform the full canonicalisation of RFC5280.

Steve.
--
Dr Stephen N. Henson. OpenSSL project core developer.
Commercial tech support now available see: http://www.openssl.org
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