/**
* Convert EC public key to PEM.
*
* @return PEM
*/
public function toPEM()
{
$curve_oid = CurveParameter::nameToOID($this->curveParameter()->value());
$x = ECConversion::octetsToNumber($this->XCoordinateParameter()->coordinateOctets());
$y = ECConversion::octetsToNumber($this->YCoordinateParameter()->coordinateOctets());
$ec = ECPublicKey::fromCoordinates($x, $y, $curve_oid);
return $ec->publicKeyInfo()->toPEM();
}
/**
*
* @see \JWX\JWS\Algorithm\OpenSSLSignatureAlgorithm::validateSignature()
* @return bool
*/
public function validateSignature($data, $signature)
{
if (strlen($signature) != $this->_signatureSize) {
throw new \UnexpectedValueException("Invalid signature length.");
}
list($r_octets, $s_octets) = str_split($signature, intval(floor($this->_signatureSize / 2)));
// convert signature to DER sequence for OpenSSL
$r = ECConversion::octetsToNumber($r_octets);
$s = ECConversion::octetsToNumber($s_octets);
$sig = new ECDSASigValue($r, $s);
return parent::validateSignature($data, $sig->toDER());
}
/**
* Convert EC private key to PEM.
*
* @return PEM
*/
public function toPEM()
{
$curve_oid = CurveParameter::nameToOID($this->curveParameter()->value());
$x = ECConversion::octetsToNumber($this->XCoordinateParameter()->coordinateOctets());
$y = ECConversion::octetsToNumber($this->YCoordinateParameter()->coordinateOctets());
$pubkey = ECPublicKey::fromCoordinates($x, $y, $curve_oid);
$priv = $this->ECCPrivateKeyParameter()->privateKeyOctets();
$ec = new ECPrivateKey($priv, $curve_oid, $pubkey->ECPoint());
return $ec->privateKeyInfo()->toPEM();
}
/**
* Get curve point coordinates.
*
* @return string[] Tuple of X and Y coordinates as base-10 numbers
*/
public function curvePoint()
{
return array_map(function ($str) {
return ECConversion::octetsToNumber($str);
}, $this->curvePointOctets());
}
