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package Net::DNS::SEC::RSA; use strict; use warnings; our $VERSION = (qw$Id: RSA.pm 1863 2022-03-14 14:59:21Z willem $)[2]; =head1 NAME Net::DNS::SEC::RSA - DNSSEC RSA digital signature algorithm =head1 SYNOPSIS require Net::DNS::SEC::RSA; $signature = Net::DNS::SEC::RSA->sign( $sigdata, $private ); $validated = Net::DNS::SEC::RSA->verify( $sigdata, $keyrr, $sigbin ); =head1 DESCRIPTION Implementation of RSA digital signature generation and verification procedures. =head2 sign $signature = Net::DNS::SEC::RSA->sign( $sigdata, $private ); Generates the wire-format signature from the sigdata octet string and the appropriate private key object. =head2 verify $validated = Net::DNS::SEC::RSA->verify( $sigdata, $keyrr, $sigbin ); Verifies the signature over the sigdata octet string using the specified public key resource record. =cut use integer; use MIME::Base64; use constant RSA_configured => Net::DNS::SEC::libcrypto->can('EVP_PKEY_new_RSA'); BEGIN { die 'RSA disabled or application has no "use Net::DNS::SEC"' unless RSA_configured } my %parameters = ( 1 => scalar eval { Net::DNS::SEC::libcrypto::EVP_md5() }, 5 => scalar eval { Net::DNS::SEC::libcrypto::EVP_sha1() }, 7 => scalar eval { Net::DNS::SEC::libcrypto::EVP_sha1() }, 8 => scalar eval { Net::DNS::SEC::libcrypto::EVP_sha256() }, 10 => scalar eval { Net::DNS::SEC::libcrypto::EVP_sha512() }, ); sub _index { return keys %parameters } sub sign { my ( $class, $sigdata, $private ) = @_; my $evpmd = $parameters{$private->algorithm}; die 'private key not RSA' unless $evpmd; my ( $n, $e, $d, $p, $q ) = map { decode_base64( $private->$_ ) } qw(Modulus PublicExponent PrivateExponent Prime1 Prime2); my $evpkey = Net::DNS::SEC::libcrypto::EVP_PKEY_new_RSA( $n, $e, $d, $p, $q ); return Net::DNS::SEC::libcrypto::EVP_sign( $sigdata, $evpkey, $evpmd ); } sub verify { my ( $class, $sigdata, $keyrr, $sigbin ) = @_; my $evpmd = $parameters{$keyrr->algorithm}; die 'public key not RSA' unless $evpmd; return unless $sigbin; my $keybin = $keyrr->keybin; # public key my ( $short, $long ) = unpack( 'Cn', $keybin ); # RFC3110, section 2 my $keyfmt = $short ? "x a$short a*" : "x3 a$long a*"; my ( $exponent, $modulus ) = unpack( $keyfmt, $keybin ); my $evpkey = Net::DNS::SEC::libcrypto::EVP_PKEY_new_RSA( $modulus, $exponent, '', '', '' ); return Net::DNS::SEC::libcrypto::EVP_verify( $sigdata, $sigbin, $evpkey, $evpmd ); } 1; __END__ ######################################## =head1 ACKNOWLEDGMENT Thanks are due to Eric Young and the many developers and contributors to the OpenSSL cryptographic library. =head1 COPYRIGHT Copyright (c)2014,2018 Dick Franks. All rights reserved. =head1 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. =head1 SEE ALSO L<Net::DNS>, L<Net::DNS::SEC>, RFC8017, RFC3110, L<OpenSSL|http://www.openssl.org/docs> =cut