My situation is fairly simple. I want to encrypt a file using PGP and a public key contained in a specific file. Following the Crypt::OpenPGP synopsis leads me to this code: 
use Crypt::OpenPGP;
my $keyring = Crypt::OpenPGP::KeyRing->new( Filename => "foo.asc" );
my $pgp = Crypt::OpenPGP->new( PubRing => $keyring );
my $data = $pgp->encrypt( Filename => $filename );

[download]
Unfortunately this results in no data being placed in $data, I assume because I didn't specify a 'Recipients' field to the encrypt method. Reading the documentation for encrypt tells me that Recipients should take one of an 8-digit hex key id, a 16 digit hex key id, or a user id. My problem is, I have no idea what to pass here. Is this a value I should be retrieving from the file some how? Is there a way to get it from the file? If not, where should I get it?

In reply to Crypt::OpenPGP, encrypting messages using a public key file by BUU

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.