forked from townforge/townforge
262 lines
8.8 KiB
Perl
262 lines
8.8 KiB
Perl
# Copyright (c) 2014-2016, The Monero Project
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#
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without modification, are
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# permitted provided that the following conditions are met:
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#
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# 1. Redistributions of source code must retain the above copyright notice, this list of
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# conditions and the following disclaimer.
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#
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# 2. Redistributions in binary form must reproduce the above copyright notice, this list
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# of conditions and the following disclaimer in the documentation and/or other
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# materials provided with the distribution.
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#
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# 3. Neither the name of the copyright holder nor the names of its contributors may be
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# used to endorse or promote products derived from this software without specific
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# prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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# THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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# THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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# Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
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use Math::BigInt only => 'GMP';
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use Digest::Keccak qw(keccak_256);
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my $p = Math::BigInt->new(2)->bpow(255)->bsub(19); #F_p
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my $l = Math::BigInt->new(2)->bpow(252)->badd('27742317777372353535851937790883648493');
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#my $d = Math::BigInt->new(486662); #motgomery: y^2 = x^3 + 486662x^2 + x
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my $d = Math::BigInt->new(-121665)->bmul(minv(121666))->bmod($p); #twisted edwards: -x^2 +y^2 = 1 + d*x^2*y^2
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my $x0 = Math::BigInt->new('15112221349535400772501151409588531511454012693041857206046113283949847762202');
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my $y0 = Math::BigInt->new('46316835694926478169428394003475163141307993866256225615783033603165251855960'); #y0 = 4/5
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my $m = Math::BigInt->new('7237005577332262213973186563042994240829374041602535252466099000494570602493'); #p = 8m+5
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my $ps = $p->copy()->bdec->bdiv(4);
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my $pl = $p->copy()->bdec->bdiv(2);
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my $ii = Math::BigInt->new(2)->bmodpow($ps,$p); #sqrt(-1)
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sub ec_rec {
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my $y = Math::BigInt->new($_[0]);
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my $xx = $y->copy()->bpow(2)->bdec()->bmul(minv($y->copy()->bpow(2)->bmul($d)->binc))->bmod($p);
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return 0 if !($xx->copy()->bmodpow($pl,$p)->binc->bmod($p));
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my $p2 = $p->copy()->badd(3)->bdiv(8);
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my $x = $xx->copy()->bmodpow($p2, $p);
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if ($x->copy()->bpow(2)->bsub($xx)->bmod($p)) {$x->bmul($ii)->bmod($p)}
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if ($x->is_odd) {$x = $p->copy()->bsub($x)};
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return $x;
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}
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sub h2i {
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return Math::BigInt->new('0x'.(unpack 'H*', (reverse pack 'H*', shift)));;
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}
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sub i2h {
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my $t = substr(Math::BigInt->new(shift)->as_hex(),2,64);
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if (length($t)%2 == 1) {$t = '0'.$t}
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return unpack 'H*', (reverse pack 'H*', $t);
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}
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sub random {
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return keccak_256(rand(2**20));
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#return keccak_256(3); #I swear that's random!
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}
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sub ec_pack {
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my $x = Math::BigInt->new($_[0]);
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my $y = Math::BigInt->new($_[1]);
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my $or = Math::BigInt->new(2)->bpow(255);
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$y |= $or if ($x->is_odd());
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return unpack 'H*', (reverse pack 'H*', substr($y->as_hex(),2,64));
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}
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sub ec_unpack {
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my $y = Math::BigInt->new(h2i(shift));
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my $b = $y >> 255;
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my $and = Math::BigInt->new(2)->bpow(255)->bdec();
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$y &= $and;
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my $x = ec_rec($y);
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return (0,0) if $x==0;
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($b==0) || ($x = $p->copy()->bsub($x));
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return ($x,$y);
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}
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sub minv {
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my $x = Math::BigInt->new(shift);
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$x->bmodpow($p-2,$p);
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return $x;
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}
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sub ec_doub {
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my $x = Math::BigInt->new($_[0]);
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my $y = Math::BigInt->new($_[1]);
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#$t = $x->copy()->bpow(2)->bmul(3)->badd($x->copy()->bmul($d)->bmul(2))->binc()->bmul(minv($y->copy()->bmul(2))); #montgomery
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#$x2 = $t->copy()->bpow(2)->bsub($d)->bsub($x)->bsub($x)->bmod($p); #montgomery
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#$y2 = $x->copy()->bmul(2)->badd($x)->badd($d)->bmul($t)->bsub($t->copy()->bpow(3))->bsub($y)->bmod($p); #montgomery
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$t = $x->copy()->bmul($x)->bmul($y)->bmul($y)->bmul($d)->bmod($p);
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$x3 = $x->copy()->bmul($y)->bmul(2)->bmul(minv($t+1))->bmod($p);
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$y3 = $y->copy()->bpow(2)->badd($x->copy()->bpow(2))->bmul(minv(1-$t))->bmod($p);
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return ($x3,$y3);
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}
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sub ec_add {
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my $x1 = Math::BigInt->new($_[0]);
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my $y1 = Math::BigInt->new($_[1]);
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my $x2 = Math::BigInt->new($_[2]);
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my $y2 = Math::BigInt->new($_[3]);
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#$t = $y2->copy()->bsub($y1)->bmul(minv($x2->copy()->bsub($x1)));
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#$x3 = $t->copy()->bpow(2)->bsub($d)->bsub($x1)->bsub($x2)->bmod($p);
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#$y3 = $x1->copy()->bmul(2)->badd($x2)->badd($d)->bmul($t)->bsub($t->copy()->bpow(3))->bsub($y1)->bmod($p);
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$t = $x1->copy->bmul($x2)->bmul($y1)->bmul($y2)->bmul($d)->bmod($p);
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$x3 = $x1->copy()->bmul($y2)->badd($y1->copy()->bmul($x2))->bmul(minv($t+1))->bmod($p);
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$y3 = $y1->copy()->bmul($y2)->badd($x1->copy()->bmul($x2))->bmul(minv(1-$t))->bmod($p);
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return ($x3,$y3);
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}
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sub ec_mul {
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my $n = Math::BigInt->new($_[0]);
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my $x = Math::BigInt->new($_[1]);
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my $y = Math::BigInt->new($_[2]);
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if ($n->is_one()) {
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return ($x,$y);
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last;
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}
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elsif ($n->is_even()) {
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$n->bdiv(2);
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return ec_mul($n,&ec_doub($x,$y));
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}
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else {
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$n->bdec()->bdiv(2);
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return ec_add($x,$y,ec_mul($n,&ec_doub($x,$y)));
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}
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}
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sub pkeygen {
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my $key = Math::BigInt->new(h2i(shift))->bmod($l);
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return ec_pack(ec_mul($key,$x0,$y0));
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}
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sub ec_hash {
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my $h = pack 'H*', shift;
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my $h = Math::BigInt->new('0x'.(unpack 'H*', reverse keccak_256($h)));
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my ($x,$y) = (0,0);
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while ($x == 0) {
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($x,$y) = ec_unpack(i2h($h));
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$h->binc();
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}
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return ec_mul(8,$x,$y);
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}
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sub im_gen {
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my ($x,$y) = ec_hash(shift);
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my $k = Math::BigInt->new(h2i(shift))->bmod($l);
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return ec_pack(ec_mul($k,$x,$y));
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}
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sub sign {
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my ($m,$sec_key) = @_;
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my $sec_key = Math::BigInt->new(h2i($sec_key));
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my ($x,$y) = ec_mul($sec_key,$x0,$y0);
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my $k = Math::BigInt->new('0x'.(unpack 'H*', random()))->bmod($l);
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#my $k = Math::BigInt->new('5267557024171956683337957876581522196748200715787296882078421399301151717969');
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my $e = unpack 'H*', keccak_256($m.(pack 'H*', ec_pack(ec_mul($k,$x0,$y0))));
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my $s = i2h(Math::BigInt->new(h2i($e))->bmul($sec_key)->bneg()->badd($k)->bmod($l));
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$e = i2h(Math::BigInt->new(h2i($e))->bmod($l));
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return ($s,$e);
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}
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sub check_s {
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my ($m,$pt,$s1,$e1) = @_;
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my ($x,$y) = ec_unpack($pt);
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my $s = Math::BigInt->new(h2i($s1))->bmod($l);
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my $e = Math::BigInt->new(h2i($e1))->bmod($l);
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my ($x1,$y1) = ec_add(ec_mul($s,$x0,$y0),ec_mul($e,$x,$y));
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$m = $m.(pack 'H*', ec_pack($x1,$y1));
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my $ev = Math::BigInt->new(h2i(unpack 'H*', keccak_256($m)))->bmod($l);
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return !$ev->bcmp($e);
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}
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sub r_sign {
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my ($m,$image,$sec_key,$index,@pkeys) = @_;
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my ($ix,$iy) = ec_unpack($image);
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my $n = @pkeys;
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my $data = $m;
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my $w = $a = $b = $hx = $hy = $px = $py = 0;
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my @zc = ();
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my $sum = Math::BigInt->new();
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#print "begin signing ($n keys)\n";
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for $i (0..$n-1) {
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($hx, $hy) = ec_hash(@pkeys[$i]);
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($px,$py) = ec_unpack(@pkeys[$i]);
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if ($i == $index) {
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$w = Math::BigInt->new('0x'.(unpack 'H*', random()))->bmod($l);
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$a = pack 'H*', ec_pack(ec_mul($w,$x0,$y0));
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$b = pack 'H*', ec_pack(ec_mul($w,$hx,$hy));
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push @zc,0,0;
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}
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else {
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$z = Math::BigInt->new('0x'.(unpack 'H*', random()))->bmod($l);
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$c = Math::BigInt->new('0x'.(unpack 'H*', random()))->bmod($l);
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$sum->badd($c);
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$a = pack 'H*', ec_pack(ec_add(ec_mul($z,$x0,$y0),ec_mul($c,$px,$py)));
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$b = pack 'H*', ec_pack(ec_add(ec_mul($z,$hx,$hy),ec_mul($c,$ix,$iy)));
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push @zc,i2h($z),i2h($c);
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}
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$data = $data.$a.$b;
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#print "key number $i done\n";
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}
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#print "generating ringsig..\n";
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my $h = unpack 'H*', keccak_256($data);
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my $cy = Math::BigInt->new(h2i($h))->bsub($sum)->bmod($l);
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my $zy = $cy->copy()->bmul(h2i($sec_key))->bneg()->badd($w)->bmod($l);
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@zc[2*$index] = i2h($zy);
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@zc[2*$index+1] = i2h($cy);
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return @zc;
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}
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sub r_check_s {
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my ($m,$image,@zc) = @_;
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my $n = @zc/3;
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for $j (0..$n-1) {
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@pkeys[$j] = shift @zc;
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}
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my $data = $m;
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my ($ix,$iy) = ec_unpack($image);
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my $a = $b = $hx = $hy = $px = $py = $z = $c = 0;
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my $sum = Math::BigInt->new();
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#print "\nBegin checking ($n keys)\n";
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for $i (0..$n-1) {
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$z = Math::BigInt->new(h2i(shift @zc))->bmod($l);
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$c = Math::BigInt->new(h2i(shift @zc))->bmod($l);
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$sum->badd($c)->bmod($l);
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($px,$py) = ec_unpack(@pkeys[$i]);
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$a = pack 'H*', ec_pack(ec_add(ec_mul($z,$x0,$y0),ec_mul($c,$px,$py)));
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($hx, $hy) = ec_hash(@pkeys[$i]);
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$b = pack 'H*', ec_pack(ec_add(ec_mul($z,$hx,$hy),ec_mul($c,$ix,$iy)));
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$data = $data.$a.$b;
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#print "key number $i done\n";
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}
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my $h = Math::BigInt->new(h2i(unpack 'H*', keccak_256($data)))->bmod($l);
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return !$h->bcmp($sum);
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}
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