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Man Pages


Manual Reference Pages  -  CRYPT::RSA::ERRORHANDLER (3)

.ds Aq ’

NAME

Crypt::RSA::Errorhandler - Error handling mechanism for Crypt::RSA.

CONTENTS

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 <B>neverB> 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

<B>B>new()<B>B> Barebones constructor.
<B>error($mesage, ($wipeme, B>$wipemetoo<B>))B> 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.
<B>B>errstr()<B>B> errstr() is an accessor method for $self->{errstr}.
<B>B>errstrrst()<B>B> This method sets $self->{errstr} to an empty string.

AUTHOR

Vipul Ved Prakash, <mail@vipul.net>

SEE ALSO

Crypt::RSA(3)
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perl v5.20.3 CRYPT::RSA::ERRORHANDLER (3) 2009-06-07

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