On Sun, Jul 29, 2012, Dave Thompson wrote:

> 
> Note that X.509 certs (and ASN.1 generally) don't actually support 
> UTF8. They support several 1-byte codes (some now obsolete), BMPString 
> which is 2-byte UCS-2, and UniversalString which is 4-byte UCS-4.
> I believe OpenSSL selects the smallest of these into which the 
> specified (Unicode) codepoints fit, which in this case is UCS-2.
> 

There is a UTF8String type which has been about for some time. OpenSSL for
certificate requests uses the smallest of a set of types determined by the
string_mask option in openssl.cnf. This is set to "utf8only" in OpenSSL 1.0.0
and later. 

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