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Posted by harryfmudd [AT] comcast [DOT] on July 21, 2006, 11:54 am
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danielhe99@gmail.com wrote:
> Hi,
>
> I am trying to use win32::OLE to access certificate store via CAPICOM.
> If certificates in the store meet the searching criteria, the
> certificates object
> method "find" works, but if no certificate meets the searching
> criteria, it will raise
> an error message:
> OLE exception from "<Unknown Source>": The Data is invalid.
>
> How to solve the problem or catch the exception in Perl script?
>
> Thanks!
>
> ===== test case =======
> #!c:/Perl/bin/perl.exe -w
> #Test store->certificates->Find
>
> use strict;
> use Win32::OLE;
>
> # CAPICOM constant definitions
> use constant {
> # Store Location
> #
> http://msdn.microsoft.com/library/en-us/security/security/capicom_store_location.asp
> CAPICOM_LOCAL_MACHINE_STORE => 1,
> CAPICOM_CURRENT_USER_STORE => 2,
> # Store Open Mode
> #
> http://msdn.microsoft.com/library/en-us/security/security/capicom_store_open_mode.asp
> CAPICOM_STORE_OPEN_READ_ONLY => 0,
> # key storage flags
> #
> http://msdn.microsoft.com/library/default.asp?url=/library/en-us/seccrypto/security/certificate_load.asp
> CAPICOM_KEY_STORAGE_DEFAULT => 0,
> # The Find method returns a Certificates object that contains all
> certificates that
> # match the specified search criteria. This method was introduced
> in CAPICOM 2.0. see:
> #
> http://msdn.microsoft.com/library/default.asp?url=/library/en-us/seccrypto/security/certificates_find.asp
> CAPICOM_CERTIFICATE_FIND_SHA1_HASH => 0,
> };
>
> # Search the certificate with the thumbprint SHA1 in local certificate
> store.
> my $SHA1 = "0000000049d8650d2515111709ee1b4800000000";
>
> Win32::OLE->Option ('Warn' => 3);
>
> # Create a new Store object, and use it to open the store. See
> #
> <http://msdn.microsoft.com/library/en-us/security/security/store.asp>.
> my $Store = Win32::OLE->new('CAPICOM.Store', sub )
> or die "Oops, cannot start CAPICOM";
> $Store->Open (CAPICOM_LOCAL_MACHINE_STORE, 'ROOT',
> CAPICOM_STORE_OPEN_READ_ONLY);
>
> # TEST the certificates->find function
> # if no certificate is found, this program will hangup after several
> tries!
> # here 10 tries, should print out 10 times "continue searching..." if
> no exception.
> for(1...10)
> {
> $Store->Certificates->Find(CAPICOM_CERTIFICATE_FIND_SHA1_HASH,
> $SHA1);
> print "continue searching...\n";
> }
> print "\nCompleted.\n";
>
>
> # perl version
> #
> # This is perl, v5.8.8 built for MSWin32-x86-multi-thread
> # (with 25 registered patches, see perl -V for more detail)
> #
> # Copyright 1987-2006, Larry Wall
> #
> # Binary build 817 [257965] provided by ActiveState
> http://www.ActiveState.com
> # Built Mar 20 2006 17:54:25
>
I'm not sure what catching thrown exceptions has to do with Perl
modules. Have you read the documentation on the 'eval' built-in?
Nit-pick: do you mean the 'Find' function? There does not appear to be
an invocation of 'find' in your code.
Tom Wyant
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