Crypt::RSA::Errorhandler(3pm) - phpMan

Crypt::RSA::Errorhandler(3pm)  User Contributed Perl Documentation  Crypt::RSA::Errorhandler(3pm)



NAME
       Crypt::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! ... "

DESCRIPTION
       Crypt::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.

METHODS
       new()
           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 AT vipul.net>

SEE ALSO
       Crypt::RSA(3)



perl v5.10.0                                2005-10-20              Crypt::RSA::Errorhandler(3pm)

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