RESOLUTION
Please, make sure that 'gpg' PHP extension is enabled by the following steps.
1) Extension has to be included into the PHP configuration (php.ini or /etc/php.d/gpgext.ini). It should be a line like:
extension=gpgext.so
2) Extension physically exists at /usr/lib/php4/gpgext.so (may be in other location, see extension_dir in php.ini).
3) Extension is loaded:
# php -i | grep gpg
/etc/php.d/gpgext.ini,
<tr><td class="e">gpgext support </td><td class="v">enabled </td></tr>
<tr><td class="e">gpgext version </td><td class="v">0.7.24 </td></tr>
<tr><td class="e">gpgext author </td><td
class="v">Lizardo Santiago (lsdrg@yahoo.com.ar)</td></tr>
<tr><td class="e">gpgext url </td><td
class="v">http://www.sf.net/projects/gpgext/
</td></tr> 4) Restart Apache if you have made any changes.
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