# phpman > perldoc > Net::DNS::RR::DS

## NAME
    [Net::DNS::RR::DS](https://www.chedong.com/phpMan.php/perldoc/Net%3A%3ADNS%3A%3ARR%3A%3ADS/markdown) - DNS DS resource record

## SYNOPSIS
        use [Net::DNS](https://www.chedong.com/phpMan.php/perldoc/Net%3A%3ADNS/markdown);
        $rr = [Net::DNS::RR](https://www.chedong.com/phpMan.php/perldoc/Net%3A%3ADNS%3A%3ARR/markdown)->new('name DS keytag algorithm digtype digest');

        use [Net::DNS::SEC](https://www.chedong.com/phpMan.php/perldoc/Net%3A%3ADNS%3A%3ASEC/markdown);
        $ds = [Net::DNS::RR::DS](https://www.chedong.com/phpMan.php/perldoc/Net%3A%3ADNS%3A%3ARR%3A%3ADS/markdown)->create(
            $dnskeyrr,
            digtype => 'SHA256',
            ttl     => 3600
            );

## DESCRIPTION
    Class for DNS Delegation Signer (DS) resource record.

## METHODS
    The available methods are those inherited from the base class augmented by the type-specific
    methods defined in this package.

    Use of undocumented package features or direct access to internal data structures is discouraged
    and could result in program termination or other unpredictable behaviour.

  keytag
        $keytag = $rr->keytag;
        $rr->keytag( $keytag );

    The 16-bit numerical key tag of the key. (RFC2535 4.1.6)

  algorithm
        $algorithm = $rr->algorithm;
        $rr->algorithm( $algorithm );

    Decimal representation of the 8-bit algorithm field.

### algorithm
    numeric code translation.

  digtype
        $digtype = $rr->digtype;
        $rr->digtype( $digtype );

    Decimal representation of the 8-bit digest type field.

### digtype
    numeric code translation.

  digest
        $digest = $rr->digest;
        $rr->digest( $digest );

    Hexadecimal representation of the digest over the label and key.

  digestbin
        $digestbin = $rr->digestbin;
        $rr->digestbin( $digestbin );

    Binary representation of the digest over the label and key.

  babble
        print $rr->babble;

    The babble() method returns the 'BubbleBabble' representation of the digest if the
    [Digest::BubbleBabble](https://www.chedong.com/phpMan.php/perldoc/Digest%3A%3ABubbleBabble/markdown) package is available, otherwise an empty string is returned.

    BubbleBabble represents a message digest as a string of plausible words, to make the digest
    easier to verify. The "words" are not necessarily real words, but they look more like words than
    a string of hex characters.

    The 'BubbleBabble' string is appended as a comment when the string method is called.

  create
        use [Net::DNS::SEC](https://www.chedong.com/phpMan.php/perldoc/Net%3A%3ADNS%3A%3ASEC/markdown);

        $dsrr = [Net::DNS::RR::DS](https://www.chedong.com/phpMan.php/perldoc/Net%3A%3ADNS%3A%3ARR%3A%3ADS/markdown)->create( $keyrr, digtype => 'SHA-256' );
        $keyrr->print;
        $dsrr->print;

    This constructor takes a DNSKEY argument and will return the corresponding DS RR constructed
    using the specified algorithm.

    The digest algorithm defaults to SHA-1.

  verify
        $verify = $dsrr->verify($keyrr);

    The boolean verify method will return true if the hash over the key RR provided as the argument
    conforms to the data in the DS itself i.e. the DS points to the DNSKEY from the argument.

## COPYRIGHT
    Copyright (c)2001-2005 RIPE NCC. Author Olaf M. Kolkman

    Portions Copyright (c)2013,2021 Dick Franks.

    All rights reserved.

    Package template (c)2009,2012 O.M.Kolkman and R.W.Franks.

## LICENSE
    Permission to use, copy, modify, and distribute this software and its documentation for any
    purpose and without fee is hereby granted, provided that the original copyright notices appear
    in all copies and that both copyright notice and this permission notice appear in supporting
    documentation, and that the name of the author not be used in advertising or publicity
    pertaining to distribution of the software without specific prior written permission.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
    BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
    NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
    DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

## SEE ALSO
    perl, [Net::DNS](https://www.chedong.com/phpMan.php/perldoc/Net%3A%3ADNS/markdown), [Net::DNS::RR](https://www.chedong.com/phpMan.php/perldoc/Net%3A%3ADNS%3A%3ARR/markdown), RFC4034

    Digest Types <<http://www.iana.org/assignments/ds-rr-types>>

    Algorithm Numbers <<http://www.iana.org/assignments/dns-sec-alg-numbers>>