| Current Path : /usr/share/perl5/Crypt/RSA/SS/ |
| Current File : //usr/share/perl5/Crypt/RSA/SS/PKCS1v15.pm |
#!/usr/bin/perl -sw
##
## Crypt::RSA::SS:PKCS1v15
##
## Copyright (c) 2001, Vipul Ved Prakash. All rights reserved.
## This code is free software; you can redistribute it and/or modify
## it under the same terms as Perl itself.
##
## $Id: PKCS1v15.pm,v 1.6 2001/06/22 23:27:38 vipul Exp $
package Crypt::RSA::SS::PKCS1v15;
use strict;
use base 'Crypt::RSA::Errorhandler';
use Crypt::RSA::DataFormat qw(octet_len os2ip i2osp h2osp);
use Crypt::RSA::Primitives;
use Crypt::RSA::Debug qw(debug);
use Digest::SHA1 qw(sha1);
use Digest::MD5 qw(md5);
use Digest::MD2 qw(md2);
use Math::Pari qw(floor);
$Crypt::RSA::SS::PKCS1v15::VERSION = '1.99';
sub new {
my ($class, %params) = @_;
my $self = bless {
primitives => new Crypt::RSA::Primitives,
digest => $params{Digest} || 'SHA1',
encoding => {
MD2 => "0x 30 20 30 0C 06 08 2A 86 48
86 F7 0D 02 02 05 00 04 10",
MD5 => "0x 30 20 30 0C 06 08 2A 86 48
86 F7 0D 02 05 05 00 04 10",
SHA1 => "0x 30 21 30 09 06 05 2B 0E 03
02 1A 05 00 04 14",
},
VERSION => $Crypt::RSA::SS::PKCS1v15::VERSION,
}, $class;
if ($params{Version}) {
# do versioning here
}
return $self;
}
sub sign {
my ($self, %params) = @_;
my $key = $params{Key}; my $M = $params{Message} || $params{Plaintext};
return $self->error ("No Message or Plaintext parameter", \$key, \%params) unless $M;
return $self->error ("No Key parameter", \$M, \%params) unless $key;
my $k = octet_len ($key->n);
my $em;
unless ($em = $self->encode ($M, $k-1)) {
return $self->error ($self->errstr, \$key, \%params, \$M)
if $self->errstr eq "Message too long.";
return $self->error ("Modulus too short.", \$key, \%params, \$M)
if $self->errstr eq "Intended encoded message length too short";
}
my $m = os2ip ($em);
my $sig = $self->{primitives}->core_sign (Key => $key, Message => $m);
return i2osp ($sig, $k);
}
sub verify {
my ($self, %params) = @_;
my $key = $params{Key}; my $M = $params{Message} || $params{Plaintext};
my $S = $params{Signature};
return $self->error ("No Message or Plaintext parameter", \$key, \%params) unless $M;
return $self->error ("No Key parameter", \$M, \$S, \%params) unless $key;
return $self->error ("No Signature parameter", \$key, \$M, \%params) unless $S;
my $k = octet_len ($key->n);
return $self->error ("Invalid signature.", \$key, \$M, \%params) if length($S) != $k;
my $s = os2ip ($S);
my $m = $self->{primitives}->core_verify (Key => $key, Signature => $s) ||
$self->error ("Invalid signature.", \$M, $key, \%params);
my $em = i2osp ($m, $k-1) ||
return $self->error ("Invalid signature.", \$M, \$S, $key, \%params);
my $em1;
unless ($em1 = $self->encode ($M, $k-1)) {
return $self->error ($self->errstr, \$key, \%params, \$M)
if $self->errstr eq "Message too long.";
return $self->error ("Modulus too short.", \$key, \%params, \$M)
if $self->errstr eq "Intended encoded message length too short.";
}
debug ("em: $em"); debug ("em1: $em1");
return 1 if $em eq $em1;
return $self->error ("Invalid signature.", \$M, \$key, \%params);
}
sub encode {
my ($self, $M, $emlen) = @_;
my $H;
if ($self->{digest} eq "SHA1") { $H = sha1 ($M) }
elsif ($self->{digest} eq "MD5" ) { $H = md5 ($M) }
elsif ($self->{digest} eq "MD2" ) { $H = md2 ($M) }
my $alg = h2osp($self->{encoding}->{$self->{digest}});
my $T = $alg . $H;
$self->error ("Intended encoded message length too short.", \$M) if $emlen < length($T) + 10;
my $pslen = $emlen - length($T) - 2;
my $PS = chr(0xff) x $pslen;
my $em = chr(1) . $PS . chr(0) . $T;
return $em;
}
sub version {
my $self = shift;
return $self->{VERSION};
}
sub signblock {
return -1;
}
sub verifyblock {
my ($self, %params) = @_;
return octet_len($params{Key}->n);
}
1;
=head1 NAME
Crypt::RSA::SS::PKCS1v15 - PKCS #1 v1.5 signatures.
=head1 SYNOPSIS
my $pkcs = new Crypt::RSA::SS::PKCS1v15 (
Digest => 'MD5'
);
my $signature = $pkcs->sign (
Message => $message,
Key => $private,
) || die $pss->errstr;
my $verify = $pkcs->verify (
Message => $message,
Key => $key,
Signature => $signature,
) || die $pss->errstr;
=head1 DESCRIPTION
This module implements PKCS #1 v1.5 signatures based on RSA. See [13]
for details on the scheme.
=head1 METHODS
=head2 B<new()>
Constructor. Takes a hash as argument with the following key:
=over 4
=item B<Digest>
Name of the Message Digest algorithm. Three Digest algorithms are
supported: MD2, MD5 and SHA1. Digest defaults to SHA1.
=back
=head2 B<version()>
Returns the version number of the module.
=head2 B<sign()>
Computes a PKCS #1 v1.5 signature on a message with the private key of the
signer. sign() takes a hash argument with the following mandatory keys:
=over 4
=item B<Message>
Message to be signed, a string of arbitrary length.
=item B<Key>
Private key of the signer, a Crypt::RSA::Key::Private object.
=back
=head2 B<verify()>
Verifies a signature generated with sign(). Returns a true value on
success and false on failure. $self->errstr is set to "Invalid signature."
or appropriate error on failure. verify() takes a hash argument with the
following mandatory keys:
=over 4
=item B<Key>
Public key of the signer, a Crypt::RSA::Key::Public object.
=item B<Message>
The original signed message, a string of arbitrary length.
=item B<Signature>
Signature computed with sign(), a string.
=back
=head1 ERROR HANDLING
See ERROR HANDLING in Crypt::RSA(3) manpage.
=head1 BIBLIOGRAPHY
See BIBLIOGRAPHY in Crypt::RSA(3) manpage.
=head1 AUTHOR
Vipul Ved Prakash, E<lt>mail@vipul.netE<gt>
=head1 SEE ALSO
Crypt::RSA(3), Crypt::RSA::Primitives(3), Crypt::RSA::Keys(3),
Crypt::RSA::EME::OAEP(3)
=cut
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