typecovered

$typecovered = $rr->typecovered;

The typecovered field identifies the type of the RRset that is covered by this RRSIG record.

algorithm

$algorithm = $rr->algorithm;

The algorithm number field identifies the cryptographic algorithm used to create the signature.

algorithm() may also be invoked as a class method or simple function to perform mnemonic and numeric code translation.

labels

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

The labels field specifies the number of labels in the original RRSIG RR owner name.

orgttl

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

The original TTL field specifies the TTL of the covered RRset as it appears in the authoritative zone.

sigexpiration and siginception times

sigex sigin sigval

$expiration = $rr->sigexpiration;
$expiration = $rr->sigexpiration( $value );
$inception = $rr->siginception;
$inception = $rr->siginception( $value );

The signature expiration and inception fields specify a validity time interval for the signature.

The value may be specified by a string with format 'yyyymmddhhmmss' or a Perl time() value.

Return values are dual-valued, providing either a string value or numerical Perl time() value.

keytag

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

The keytag field contains the key tag value of the DNSKEY RR that validates this signature.

signame

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

The signer name field value identifies the owner name of the DNSKEY RR that a validator is supposed to use to validate this signature.

signature

sig

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

The Signature field contains the cryptographic signature that covers the RRSIG RDATA (excluding the Signature field) and the RRset specified by the RRSIG owner name, RRSIG class, and RRSIG type covered fields.

sigbin

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

Binary representation of the cryptographic signature.

create

Create a signature over a RR set.

use Net::DNS::SEC;
$keypath = '/home/olaf/keys/Kbla.foo.+001+60114.private';
$sigrr = Net::DNS::RR::RRSIG->create( \@rrsetref, $keypath );
$sigrr = Net::DNS::RR::RRSIG->create( \@rrsetref, $keypath,
                                    sigex => 20241230010101
                                    sigin => 20241201010101
                                    );
$sigrr->print;
# Alternatively use Net::DNS::SEC::Private 
$private = Net::DNS::SEC::Private->new($keypath);
$sigrr= Net::DNS::RR::RRSIG->create( \@rrsetref, $private );

create() is an alternative constructor for a RRSIG RR object.

This method returns an RRSIG with the signature over the subject rrset (an array of RRs) made with the private key stored in the key file.

The first argument is a reference to an array that contains the RRset that needs to be signed.

The second argument is a string which specifies the path to a file containing the private key as generated by dnssec-keygen.

The optional remaining arguments consist of ( name => value ) pairs as follows:

sigex  => 20241230010101,       # signature expiration
sigin  => 20241201010101,       # signature inception
sigval => 30,                   # validity window (days)
ttl    => 3600                  # TTL

The sigin and sigex values may be specified as Perl time values or as a string with the format 'yyyymmddhhmmss'. The default for sigin is the time of signing.

The sigval argument specifies the signature validity window in days ( sigex = sigin + sigval ).

By default the signature is valid for 30 days.

By default the TTL matches the RRset that is presented for signing.

verify

$verify = $sigrr->verify( $rrsetref, $keyrr );
$verify = $sigrr->verify( $rrsetref, [$keyrr, $keyrr2, $keyrr3] );

$rrsetref contains a reference to an array of RR objects and the method verifies the RRset against the signature contained in the $sigrr object itself using the public key in $keyrr.

The second argument can either be a Net::DNS::RR::KEYRR object or a reference to an array of such objects. Verification will return successful as soon as one of the keys in the array leads to positive validation.

Returns 0 on error and sets $sig->vrfyerrstr

vrfyerrstr

$verify = $sigrr->verify( $rrsetref, $keyrr );
print $sigrr->vrfyerrstr unless $verify;
$sigrr->verify( $rrsetref, $keyrr ) || die $sigrr->vrfyerrstr;