/**
* @param GeneratorPoint $G
* @param $hash
* @return int|string
*/
public function truncateHash(GeneratorPoint $G, $hash)
{
$hexSize = strlen($this->adapter->decHex($hash));
$hashBits = $this->adapter->baseConvert($hash, 10, 2);
if (strlen($hashBits) < $hexSize * 4) {
$hashBits = str_pad($hashBits, $hexSize * 4, '0', STR_PAD_LEFT);
}
$messageHash = $this->adapter->baseConvert(substr($hashBits, 0, NumberSize::bnNumBits($this->adapter, $G->getOrder())), 2, 10);
return $messageHash;
}
/**
* @dataProvider getDeterministicSign2Data
*/
public function testDeterministicSign2($curve, $size, $algo, $privKey, $message, $eK, $eR, $eS)
{
//echo "Try {$test->curve} / {$test->algorithm} / '{$test->message}'\n";
$G = CurveFactory::getGeneratorByName($curve);
// Initialize private key and message hash (decimal)
$privateKey = $G->getPrivateKeyFrom($this->math->hexDec($privKey));
$hashHex = hash($algo, $message);
$messageHash = $this->math->hexDec($hashHex);
// Derive K
$drbg = RandomGeneratorFactory::getHmacRandomGenerator($privateKey, $messageHash, $algo);
$k = $drbg->generate($G->getOrder());
$this->assertEquals($this->math->hexdec($eK), $k, 'k');
$hexSize = strlen($hashHex);
$hashBits = $this->math->baseConvert($messageHash, 10, 2);
if (strlen($hashBits) < $hexSize * 4) {
$hashBits = str_pad($hashBits, $hexSize * 4, '0', STR_PAD_LEFT);
}
$messageHash = $this->math->baseConvert(substr($hashBits, 0, $size), 2, 10);
$signer = new Signer($this->math);
$sig = $signer->sign($privateKey, $messageHash, $k);
// R and S should be correct
$sR = $this->math->hexDec($eR);
$sS = $this->math->hexDec($eS);
$this->assertTrue($signer->verify($privateKey->getPublicKey(), $sig, $messageHash));
$this->assertSame($sR, $sig->getR(), 'r');
$this->assertSame($sS, $sig->getS(), 's');
}
/**
* @param $a
* @param $b
* @param $cond
*/
public function cswapValue(&$a, &$b, $cond)
{
$size = max(strlen($this->adapter->baseConvert($a, 10, 2)), strlen($this->adapter->baseConvert($b, 10, 2)));
$mask = 1 - intval($cond);
$mask = str_pad('', $size, $mask, STR_PAD_LEFT);
$mask = $this->adapter->baseConvert($mask, 2, 10);
$tA = $this->adapter->bitwiseAnd($a, $mask);
$tB = $this->adapter->bitwiseAnd($b, $mask);
$a = $this->adapter->bitwiseXor($this->adapter->bitwiseXor($a, $b), $tB);
$b = $this->adapter->bitwiseXor($this->adapter->bitwiseXor($a, $b), $tA);
$a = $this->adapter->bitwiseXor($this->adapter->bitwiseXor($a, $b), $tB);
}