/**
* @param NamedCurveFp $curve
* @return ObjectIdentifier
*/
public static function getCurveOid(NamedCurveFp $curve)
{
if (array_key_exists($curve->getName(), self::$oidMap)) {
$oidString = self::$oidMap[$curve->getName()];
return new ObjectIdentifier($oidString);
}
throw new \RuntimeException('Unsupported curve type.');
}
/**
* @param MathAdapterInterface $math
* @param NamedCurveFp $curve
* @param GeneratorPoint $generatorPoint
* @param Hasher $hasher - must be a known hash algorithm
*/
public function __construct(MathAdapterInterface $math, NamedCurveFp $curve, GeneratorPoint $generatorPoint, Hasher $hasher)
{
if (!$curve->contains($generatorPoint->getX(), $generatorPoint->getY())) {
throw new \RuntimeException('Provided generator point does not exist on curve');
}
$this->hasher = $hasher;
$this->curve = $curve;
$this->generator = $generatorPoint;
$this->math = $math;
}
/**
* @param NamedCurveFp $curve
* @return string
*/
public function getCanonicalCurveName(NamedCurveFp $curve)
{
switch ($curve->getName()) {
case 'nist-p256':
return 'nistp256';
case 'nist-p384':
return 'nistp384';
case 'nist-p521':
return 'nistp521';
default:
throw new \RuntimeException('Key not supported by git');
}
}
/**
* @param MathAdapterInterface $math
* @param NamedCurveFp $c
* @return Sequence
*/
private function getCurveAsn(MathAdapterInterface $math, NamedCurveFp $c)
{
$a = new OctetString($math->decHex($math->mod($c->getA(), $c->getPrime())));
$b = new OctetString($math->decHex($math->mod($c->getB(), $c->getPrime())));
try {
$seed = CurveRandomSeed::getSeed($c);
return new Sequence($a, $b, new BitString($seed));
} catch (\Exception $e) {
return new Sequence($a, $b);
}
}
