/**
* @param NamedCurveFp $c
* @param GeneratorPoint $G
* @return string
*/
public function serialize(NamedCurveFp $c, GeneratorPoint $G)
{
$math = $G->getAdapter();
$fieldID = $this->getFieldIdAsn($math, $c);
$curve = $this->getCurveAsn($math, $c);
$domain = new Sequence(new Integer(1), $fieldID, $curve, new OctetString($this->pointSerializer->serialize($G)), new Integer($G->getOrder()), new Integer(1));
$payload = $domain->getBinary();
$content = self::HEADER . PHP_EOL . trim(chunk_split(base64_encode($payload), 64, PHP_EOL)) . PHP_EOL . self::FOOTER;
return $content;
}
/**
* @dataProvider getHmacTestSet
* @param GeneratorPoint $G
* @param integer $size
* @param string $privKey
* @param string $algo
* @param string $message
* @param string $eK expected K hex
* @param string $eR expected R hex
* @param string $eS expected S hex
*/
public function testHmacSignatures(GeneratorPoint $G, $size, $privKey, $algo, $message, $eK, $eR, $eS)
{
//echo "Try {$test->curve} / {$test->algorithm} / '{$test->message}'\n";
$math = $G->getAdapter();
// Initialize private key and message hash (decimal)
$privateKey = $G->getPrivateKeyFrom($math->hexDec($privKey));
$hashHex = hash($algo, $message);
$messageHash = $math->hexDec($hashHex);
// Derive K
$drbg = RandomGeneratorFactory::getHmacRandomGenerator($privateKey, $messageHash, $algo);
$k = $drbg->generate($G->getOrder());
$this->assertEquals($k, $math->hexdec($eK), 'k');
$hexSize = strlen($hashHex);
$hashBits = $math->baseConvert($messageHash, 10, 2);
if (strlen($hashBits) < $hexSize * 4) {
$hashBits = str_pad($hashBits, $hexSize * 4, '0', STR_PAD_LEFT);
}
$messageHash = $math->baseConvert(substr($hashBits, 0, NumberSize::bnNumBits($math, $G->getOrder())), 2, 10);
$signer = new Signer($math);
$sig = $signer->sign($privateKey, $messageHash, $k);
// Should be consistent
$this->assertTrue($signer->verify($privateKey->getPublicKey(), $sig, $messageHash));
// R and S should be correct
$sR = $math->hexDec($eR);
$sS = $math->hexDec($eS);
$this->assertSame($sR, $sig->getR(), "r {$sR} == " . $sig->getR());
$this->assertSame($sS, $sig->getS(), "s {$sR} == " . $sig->getS());
}