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.

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 KEY RR that validates this signature.

signame¶

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

The signer name field value identifies the owner name of the KEY 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 SIG RDATA (excluding the Signature field) and the subject data.

sigbin¶

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

Binary representation of the cryptographic signature.

create¶

Create a signature over scalar data.

    use Net::DNS::SEC;
    $keypath = '/home/olaf/keys/Kbla.foo.+001+60114.private';
    $sigrr = Net::DNS::RR::SIG->create( $data, $keypath );
    $sigrr = Net::DNS::RR::SIG->create( $data, $keypath,
                                        sigval => 10
                                        );
    $sigrr->print;
    # Alternatively use Net::DNS::SEC::Private 
    $private = Net::DNS::SEC::Private->new($keypath);
    $sigrr= Net::DNS::RR::SIG->create( $data, $private );

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

This method returns a SIG with the signature over the data made with the private key stored in the key file.

The first argument is a scalar that contains the data to be signed.

The second argument is a string which specifies the path to a file containing the private key as generated using dnssec-keygen, a program that comes with the ISC BIND distribution.

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

        sigin  => 20191201010101,       # signature inception
        sigex  => 20191201011101,       # signature expiration
        sigval => 10,                   # validity window (minutes)

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 minutes ( sigex = sigin + sigval ).

By default the signature is valid for 10 minutes.

•

Do not change the name of the private key file. The create method uses the filename as generated by dnssec-keygen to determine the keyowner, algorithm, and the keyid (keytag).

verify¶

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

The verify() method performs SIG0 verification of the specified data against the signature contained in the $sigrr object itself using the public key in $keyrr.

If a reference to a Net::DNS::Packet is supplied, the method performs a SIG0 verification on the packet data.

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 false on error and sets $sig->vrfyerrstr

vrfyerrstr¶

    $sig0 = $packet->sigrr || die 'not signed';
    print $sig0->vrfyerrstr unless $sig0->verify( $packet, $keyrr );
    $sigrr->verify( $packet, $keyrr ) || die $sigrr->vrfyerrstr;