Crypt::RSA::ErrorhandlUser)Contributed Perl DocumenCrypt::RSA::Errorhandler(3)NAMECrypt::RSA::Errorhandler - Error handling mechanism for Crypt::RSA.
SYNOPSIS
package Foo;
use Crypt::RSA::Errorhandler;
@ISA = qw(Crypt::RSA::Errorhandler);
sub alive {
..
..
return
$self->error ("Awake, awake! Ring the alarum bell. \
Murther and treason!", $dagger)
if $self->murdered($king);
}
package main;
use Foo;
my $foo = new Foo;
$foo->alive($king) or print $foo->errstr();
# prints "Awake, awake! ... "
DESCRIPTIONCrypt::RSA::Errorhandler encapsulates the error handling mechanism used
by the modules in Crypt::RSA bundle. Crypt::RSA::Errorhandler doesn't
have a constructor and is meant to be inherited. The derived modules
use its two methods, error() and errstr(), to communicate error
messages to the caller.
When a method of the derived module fails, it calls $self->error() and
returns undef to the caller. The error message passed to error() is
made available to the caller through the errstr() accessor. error()
also accepts a list of sensitive data that it wipes out (undef'es)
before returning.
The caller should never call errstr() to check for errors. errstr()
should be called only when a method indicates (usually through an undef
return value) that an error has occured. This is because errstr() is
never overwritten and will always contain a value after the occurance
of first error.
METHODSnew()
Barebones constructor.
error($mesage, ($wipeme, $wipemetoo))
The first argument to error() is $message which is placed in $self-
>{errstr} and the remaining arguments are interpretted as variables
containing sensitive data that are wiped out from the memory.
error() always returns undef.
errstr()errstr() is an accessor method for $self->{errstr}.
errstrrst()
This method sets $self->{errstr} to an empty string.
AUTHOR
Vipul Ved Prakash, <mail@vipul.net>
SEE ALSOCrypt::RSA(3)perl v5.14.1 2009-06-07 Crypt::RSA::Errorhandler(3)
