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Черепанов Леонид > Convert-X509-0.3 > Convert::X509



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Module Version: 0.3   Source  


Convert::X509 - interface module to help analizing X509 data


 use Convert::X509;
 use Data::Dumper;

 my $d;
 local $/;

 open (F,'<', 'request.req');
# binmode(F);
# recommended for DER encoding, doesn't for BASE64
 $d = Convert::X509::Request->new(<F>);
 print 'Dumping request object:',Dumper ($d);
 # ! scalar context
 my $subj = $d->subject('cp1251','cp866') ; # localized Cyrillic
 print "\n",'CN: ', $subj->{'CN'}[0];

 open (F,'<', 'certificate.cer');
# binmode(F);
 $d = Convert::X509::Certificate->new(<F>,1); #debug flag
 print "\n\n",'Dumping certificate object:',Dumper ($d);
 # ! list context; UTF -> KOI8-R convertion
 print 'Issuer: ',join(',',$d->issuer('','koi8-r')), "\n",
  'valid from ',[$d->from()]->[0], ' to (exactly) ', scalar($d->to);

 open (F,'<', 'crl.crl');
# binmode(F);
 $d = Convert::X509::CRL->new(<F>);
 print "\n",'Dumping CRL object:',Dumper ($d);
 my ($s) = sort {$d->{'crl'}{$a}{'date'}{'utcTime'} <=> $d->{'crl'}{$b}{'date'}{'utcTime'}}
  keys %{$d->{'crl'}}; # example, take "first" serial
 print 'Revocation reason for the earliest revoked certificate N ',$s,' : ',$d->reason($s),"\n",
  'Get next CRL update ', scalar($d->next), ' from', "\n",
  join("\n or\n", $d->cdp);


Convert::X509 really consists of six parts.

1) Convert::X509 itself just for convinient usage.

2) Convert::X509::Parser for internal usage (contains almost everything - ASN.1 sructure, OIDs "database", base data-processing, most logic and code).

3,4,5) Request, Certificate and CRL to parse respectively requests, certificates and crl-s. Almost any valueble data could be easely extracted directly from returned object (look in Dumper output). For some convinience, there are a few methods with self-explaining names.

6) Take a look on Convert::X509::minipkcs7 - it gets serials/oids from PKCS7 (encrypted/signed) messages.



Constructor, creates a new object. It takes a parameter which contains req/cert/crl itself - both DER and BASE64 encoding supported.

FYI: be careful with binary and ASCII Base64 data been readed from file. For binary form (DER) you must do "binmode", for Base64 - have NOT. Check if returned object is defined.

You can set debug parameter to get a bit more debugging information ...->new(<DATA>,1);


Applicable to Request and Certificate.

Result of method differs for scalar and list context: - a hash-reference like {'C'=>['org'], 'OU'=>['cpan','search']}; values list often contains only one element, but many in general - a list like ('CN=Name Surname','C=RU','L=Moscow')

X509 data may contains unicode strings, so in general we have to decode it to localized one-byte oriented string. It is the _second_ parameter (result codepage) subject method could accept.

But sometimes X509 data contains already "localized" one-byte string. And its codepage (_first_ param accepted by subject) can be different for console.

That's why subject can get up to two codepages subject(cp_from,cp_to) (look And pretty print subject with russian strings may looks like subject('cp1251','cp866') for Windows (R) console and subject('','koi8-r') for FreeBSD console.


Applicable to Certificate and CRL.

See 'subject' for details (i.e. localization, scalar/list context)


Applicable to Certificate and CRL.

Return a date-time (pure ANSI format) object is valid from. Result differs for scalar and list context: - a string like '2008-02-29 09:00:01' - a 2 elements list like ('2008-02-29', '09:00:01');

!Important note! It deals only with utcTime-formatted value (no GeneralizedTime support)


Applicable to Certificate and CRL.

Return a date-time (pure ANSI format) object is valid to. See 'from' for details.


Applicable to CRL only.

Return a date-time (pure ANSI format) next CRL publish. See 'from' for details.


Applicable to Certificate and CRL.

Does object have been expired ? Simply return (TNOW or FROMNOW)

eku (EnhancedKeyUsage)

Applicable to Request and Certificate.

Returns a list with EKU OIDs (their descriptions if they are in OIDs hash i.e. wellknown).


Applicable to Request and Certificate.

Returns a list with descriptions for installed bits.


Applicable to Certificate and CRL.

Returns serial in hexadecimal view.


Applicable to CRL only.

Returns a revocation description for certificate with given serial. If reason totally hasn't been specified - returns 'Unspecified' anyway.


Applicable to Certificate and CRL.

Returns list of CRL distribution point


Applicable to Certificate only.

Returns list of Authority Information Access locations



These modules were created with initial ideas on the Crypt::X509 package. Thanks to its authors Mike Jackson <>, Alexander Jung <>, Duncan Segrest <>;

And also Norbert Klasen (author of x509decode script, which was contributed to Convert::ASN1 in 2002) and Graham Barr <> (author of Convert::ASN1 package).

P.S. ^

Your PKCS#xx structures may contain many unusual things, which I haven't ever seen. Mail me any suggestions. And do not afraid to look inside modules! I hope they are quite simple.


Leonid Cherepanov <grey.leo/>

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