406 lines
11 KiB
PHP
Executable File
406 lines
11 KiB
PHP
Executable File
<?php
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class Block {
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public function add($height, $public_key, $nonce, $data, $date, $signature, $difficulty, $reward_signature, $argon){
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global $db;
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$acc=new Account;
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$trx=new Transaction;
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//try {
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// } catch (Exception $e){
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// }
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$generator=$acc->get_address($public_key);
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ksort($data);
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$hash=$this->hash($generator, $height, $date, $nonce, $data, $signature, $difficulty, $argon);
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$json=json_encode($data);
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$info="{$generator}-{$height}-{$date}-{$nonce}-{$json}-{$difficulty}-{$argon}";
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if(!$acc->check_signature($info,$signature,$public_key)) return false;
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if(!$this->parse_block($hash,$height,$data, true)) return false;
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$db->exec("LOCK TABLES blocks WRITE, accounts WRITE, transactions WRITE, mempool WRITE");
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$reward=$this->reward($height,$data);
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$msg='';
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$transaction=array("src"=>$generator, "dst"=>$generator, "val"=>$reward, "version"=>0, "date"=>$date, "message"=>$msg, "fee"=>"0.00000000","public_key"=>$public_key);
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$transaction['signature']=$reward_signature;
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$transaction['id']=$trx->hash($transaction);
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$info=$transaction['val']."-".$transaction['fee']."-".$transaction['dst']."-".$transaction['message']."-".$transaction['version']."-".$transaction['public_key']."-".$transaction['date'];
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if(!$acc->check_signature($info,$reward_signature,$public_key)) return false;
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$db->beginTransaction();
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$total=count($data);
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$bind=array(":id"=>$hash,":generator"=>$generator, ":signature"=>$signature, ":height"=>$height, ":date"=>$date, ":nonce"=>$nonce, ":difficulty"=>$difficulty,":argon"=>$argon, ":transactions"=>$total);
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$res=$db->run("INSERT into blocks SET id=:id, generator=:generator, height=:height,`date`=:date,nonce=:nonce, signature=:signature, difficulty=:difficulty, argon=:argon, transactions=:transactions",$bind);
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if($res!=1) {
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$db->rollback();
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$db->exec("UNLOCK TABLES");
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return false;
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}
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$trx->add($hash, $height,$transaction);
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$res=$this->parse_block($hash,$height,$data, false);
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if($res==false) $db->rollback();
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else $db->commit();
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$db->exec("UNLOCK TABLES");
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return true;
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}
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public function current(){
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global $db;
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$current=$db->row("SELECT * FROM blocks ORDER by height DESC LIMIT 1");
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if(!$current){
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$this->genesis();
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return $this->current(true);
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}
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return $current;
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}
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public function prev(){
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global $db;
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$current=$db->row("SELECT * FROM blocks ORDER by height DESC LIMIT 1,1");
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return $current;
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}
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public function difficulty($height=0){
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global $db;
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if($height==0){
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$current=$this->current();
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} else{
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$current=$this->get($height);
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}
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$height=$current['height'];
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$limit=20;
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if($height<20)
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$limit=$height-1;
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if($height<10) return $current['difficulty'];
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$first=$db->row("SELECT `date` FROM blocks ORDER by height DESC LIMIT $limit,1");
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$time=$current['date']-$first['date'];
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$result=ceil($time/$limit);
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if($result>220){
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$dif= bcmul($current['difficulty'], 1.05);
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} elseif($result<260){
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$dif= bcmul($current['difficulty'], 0.95);
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} else {
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$dif=$current['difficulty'];
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}
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if($dif<1000) $dif=1000;
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if($dif>9223372036854775800) $dif=9223372036854775800;
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return $dif;
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}
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public function max_transactions(){
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global $db;
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$current=$this->current();
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$limit=$current['height']-100;
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$avg=$db->single("SELECT AVG(transactions) FROM blocks WHERE height>:limit",array(":limit"=>$limit));
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if($avg<100) return 100;
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return ceil($avg*1.1);
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}
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public function reward($id,$data=array()){
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$reward=1000;
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$factor=floor($id/10800)/100;
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$reward-=$reward*$factor;
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if($reward<0) $reward=0;
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$fees=0;
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if(count($data)>0){
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foreach($data as $x){
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$fees+=$x['fee'];
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}
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}
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return number_format($reward+$fees,8,'.','');
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}
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public function check($data){
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if(strlen($data['argon'])<20) return false;
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$acc=new Account;
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if(!$acc->valid_key($data['public_key'])) return false;
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if($data['difficulty']!=$this->difficulty()) return false;
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if(!$this->mine($data['public_key'],$data['nonce'], $data['argon'])) return false;
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return true;
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}
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public function forge($nonce, $argon, $public_key, $private_key){
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if(!$this->mine($public_key,$nonce, $argon)) return false;
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$current=$this->current();
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$height=$current['height']+=1;
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$date=time();
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if($date<=$current['date']) return 0;
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$txn=new Transaction;
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$data=$txn->mempool($this->max_transactions());
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$difficulty=$this->difficulty();
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$acc=new Account;
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$generator=$acc->get_address($public_key);
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ksort($data);
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$signature=$this->sign($generator, $height, $date, $nonce, $data, $private_key, $difficulty, $argon);
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// reward signature
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$reward=$this->reward($height,$data);
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$msg='';
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$transaction=array("src"=>$generator, "dst"=>$generator, "val"=>$reward, "version"=>0, "date"=>$date, "message"=>$msg, "fee"=>"0.00000000","public_key"=>$public_key);
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ksort($transaction);
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$reward_signature=$txn->sign($transaction, $private_key);
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$res=$this->add($height, $public_key, $nonce, $data, $date, $signature, $difficulty, $reward_signature, $argon);
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if(!$res) return false;
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return true;
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}
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public function mine($public_key, $nonce, $argon, $difficulty=0, $current_id=0){
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if($current_id===0){
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$current=$this->current();
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$current_id=$current['id'];
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}
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if($difficulty===0) $difficulty=$this->difficulty();
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$argon='$argon2i$v=19$m=16384,t=4,p=4'.$argon;
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$base="$public_key-$nonce-".$current_id."-$difficulty";
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if(!password_verify($base,$argon)) { return false; }
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$hash=$base.$argon;
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for($i=0;$i<5;$i++) $hash=hash("sha512",$hash,true);
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$hash=hash("sha512",$hash);
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$m=str_split($hash,2);
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$duration=hexdec($m[10]).hexdec($m[15]).hexdec($m[20]).hexdec($m[23]).hexdec($m[31]).hexdec($m[40]).hexdec($m[45]).hexdec($m[55]);
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$duration=ltrim($duration, '0');
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$result=gmp_div($duration, $difficulty);
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if($result>0&&$result<=240) return true;
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return false;
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}
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public function parse_block($block, $height, $data, $test=true){
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global $db;
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if($data===false) return false;
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$acc=new Account;
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$trx=new Transaction;
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if(count($data)==0) return true;
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$max=$this->max_transactions();
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if(count($data)>$max) return false;
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$balance=array();
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foreach($data as &$x){
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if(empty($x['src'])) $x['src']=$acc->get_address($x['public_key']);
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if(!$trx->check($x)) return false;
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$balance[$x['src']]+=$x['val']+$x['fee'];
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if($db->single("SELECT COUNT(1) FROM transactions WHERE id=:id",array(":id"=>$x['id']))>0) return false; //duplicate transaction
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}
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foreach($balance as $id=>$bal){
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$res=$db->single("SELECT COUNT(1) FROM accounts WHERE id=:id AND balance>=:balance",array(":id"=>$id, ":balance"=>$bal));
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if($res==0) return false; // not enough balance for the transactions
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}
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if($test==false){
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foreach($data as $d){
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$res=$trx->add($block, $height, $d);
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if($res==false) return false;
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}
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}
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return true;
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}
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private function genesis(){
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global $db;
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$signature='AN1rKvtLTWvZorbiiNk5TBYXLgxiLakra2byFef9qoz1bmRzhQheRtiWivfGSwP6r8qHJGrf8uBeKjNZP1GZvsdKUVVN2XQoL';
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$generator='2P67zUANj7NRKTruQ8nJRHNdKMroY6gLw4NjptTVmYk6Hh1QPYzzfEa9z4gv8qJhuhCNM8p9GDAEDqGUU1awaLW6';
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$public_key='PZ8Tyr4Nx8MHsRAGMpZmZ6TWY63dXWSCyjGMdVDanywM3CbqvswVqysqU8XS87FcjpqNijtpRSSQ36WexRDv3rJL5X8qpGvzvznuErSRMfb2G6aNoiaT3aEJ';
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$reward_signature='381yXZ3yq2AXHHdXfEm8TDHS4xJ6nkV4suXtUUvLjtvuyi17jCujtwcwXuYALM1F3Wiae2A4yJ6pXL1kTHJxZbrJNgtsKEsb';
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$argon='$M1ZpVzYzSUxYVFp6cXEwWA$CA6p39MVX7bvdXdIIRMnJuelqequanFfvcxzQjlmiik';
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$difficulty="5555555555";
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$height=1;
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$data=array();
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$date='1515324995';
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$nonce='4QRKTSJ+i9Gf9ubPo487eSi+eWOnIBt9w4Y+5J+qbh8=';
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$res=$this->add($height, $public_key, $nonce, $data, $date, $signature, $difficulty, $reward_signature,$argon);
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if(!$res) api_err("Could not add the genesis block.");
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}
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// delete last X blocks
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public function pop($no=1){
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$current=$this->current();
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$this->delete($current['height']-$no+1);
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}
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public function delete($height){
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if($height<2) $height=2;
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global $db;
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$trx=new Transaction;
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$r=$db->run("SELECT * FROM blocks WHERE height>=:height ORDER by height DESC",array(":height"=>$height));
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if(count($r)==0) return;
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$db->beginTransaction();
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$db->exec("LOCK TABLES blocks WRITE, accounts WRITE, transactions WRITE, mempool WRITE");
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foreach($r as $x){
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$res=$trx->reverse($x['id']);
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if($res===false) {
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$db->rollback();
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$db->exec("UNLOCK TABLES");
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return false;
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}
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$res=$db->run("DELETE FROM blocks WHERE id=:id",array(":id"=>$x['id']));
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if($res!=1){
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$db->rollback();
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$db->exec("UNLOCK TABLES");
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return false;
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}
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}
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$db->commit();
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$db->exec("UNLOCK TABLES");
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return true;
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}
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public function delete_id($id){
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global $db;
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$trx=new Transaction;
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$x=$db->row("SELECT * FROM blocks WHERE id=:id",array(":id"=>$id));
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if($x===false) return false;
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$db->beginTransaction();
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$db->exec("LOCK TABLES blocks WRITE, accounts WRITE, transactions WRITE, mempool WRITE");
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$res=$trx->reverse($x['id']);
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if($res===false) {
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$db->rollback();
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$db->exec("UNLOCK TABLES");
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return false;
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}
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$res=$db->run("DELETE FROM blocks WHERE id=:id",array(":id"=>$x['id']));
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if($res!=1){
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$db->rollback();
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$db->exec("UNLOCK TABLES");
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return false;
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}
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$db->commit();
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$db->exec("UNLOCK TABLES");
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return true;
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}
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public function sign($generator, $height, $date, $nonce, $data, $key, $difficulty, $argon){
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$json=json_encode($data);
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$info="{$generator}-{$height}-{$date}-{$nonce}-{$json}-{$difficulty}-{$argon}";
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$signature=ec_sign($info,$key);
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return $signature;
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}
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public function hash($public_key, $height, $date, $nonce, $data, $signature, $difficulty, $argon){
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$json=json_encode($data);
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$hash= hash("sha512", "{$public_key}-{$height}-{$date}-{$nonce}-{$json}-{$signature}-{$difficulty}-{$argon}");
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return hex2coin($hash);
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}
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public function export($id="",$height=""){
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if(empty($id)&&empty($height)) return false;
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global $db;
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$trx=new Transaction;
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if(!empty($height)) $block=$db->row("SELECT * FROM blocks WHERE height=:height",array(":height"=>$height));
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else $block=$db->row("SELECT * FROM blocks WHERE id=:id",array(":id"=>$id));
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if(!$block) return false;
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$r=$db->run("SELECT * FROM transactions WHERE version>0 AND block=:block",array(":block"=>$block['id']));
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$transactions=array();
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foreach($r as $x){
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$trans=array("id"=>$x['id'],"dst"=>$x['dst'],"val"=>$x['val'],"fee"=>$x['fee'],"signature"=>$x['signature'], "message"=>$x['message'],"version"=>$x['version'],"date"=>$x['date'], "public_key"=>$x['public_key']);
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ksort($trans);
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$transactions[$x['id']]=$trans;
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}
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ksort($transactions);
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$block['data']=$transactions;
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$gen=$db->row("SELECT public_key, signature FROM transactions WHERE version=0 AND block=:block",array(":block"=>$block['id']));
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$block['public_key']=$gen['public_key'];
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$block['reward_signature']=$gen['signature'];
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return $block;
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}
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public function get($height){
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global $db;
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if(empty($height)) return false;
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$block=$db->row("SELECT * FROM blocks WHERE height=:height",array(":height"=>$height));
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return $block;
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}
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}
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?>
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