asn1parse genstr question

[Dmitry Belyavsky]

Dear Victor,

On Mon, Apr 22, 2019 at 9:23 PM Viktor Dukhovni <openssl-users at dukhovni.org>
wrote:

> On Sun, Apr 21, 2019 at 06:58:53PM +0300, Dmitry Belyavsky wrote:
>
> > When I use a command
> >
> > openssl asn1parse -genstr "UTF8String:ф" -out content
> >
> > I get a 6-byte file. If I understand correctly, it starts with a 2-byte
> > header indicating the content length and then contains an encoded letter
> > 'ф' I want. But the encoding of it is not UTF8, as the utf8 encoding of a
> > cyrillic letter is 2 bytes long.
> >
> > Am I wrong? If the behavior I see is desired one, how can I convert the
> > result of the encoding to UTF8 using openssl internal API?
>
> By default the input string is assumed to contain single-byte octets,
> which are individually encoded as UTF-8.  This is rarely what you
> want if your input is not ASCII.  For actual UTF-8 input, you can
> use:
>
>     $ openssl asn1parse -out content -genstr 'FORMAT:UTF8,UTF8String:Он
> врет! Он не знает, КАК НАДО!' # [1]
>         0:d=0  hl=2 l=  53 prim: UTF8STRING        :Он врет! Он не знает,
> КАК НАДО!
>
> The "genstr" format is described in, for example:
>
>     https://www.openssl.org/docs/man1.0.2/man3/ASN1_generate_nconf.html


Thank you very much for your answer and especially for a brilliant example
:)

I'm trying to implement RFC 8398 and I try to create a valid certificate
with EAI email in otherName.

I expected that a line in the config file

subjectAltName=otherName:1.3.6.1.5.5.7.8.9;FORMAT:UTF8,UTF8:医生@
大学.example.com <http://xn--pss25c.example.com>

will do the trick.
But I get an error
140642093051968:error:0D0B20C2:asn1 encoding
routines:ASN1_generate_v3:unknown tag:../crypto/asn1/asn1_gen.c:94:
140642093051968:error:220A4093:X509 V3 routines:a2i_GENERAL_NAME:othername
error:../crypto/x509v3/v3_alt.c:456:
140642093051968:error:22098080:X509 V3 routines:X509V3_EXT_nconf:error in
extension:../crypto/x509v3/v3_conf.c:47:name=subjectAltName,
value=otherName:1.3.6.1.5.5.7.8.9;FORMAT:UTF8,UTF8:医生@大学.example.com
<http://xn--pss25c.example.com>

If I specify the otherName like
subjectAltName=otherName:1.3.6.1.5.5.7.8.9;UTF8:医生@大学.example.com
<http://xn--pss25c.example.com>

I do not get an error, but the encoding seems to be not UTF8, but ASCII.
Can this behavior be fixed?


>
> --
>         Viktor.
>
> [1]. http://www.mnemosyne.ru/homo/galich-6.html
>


-- 
SY, Dmitry Belyavsky
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