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<?php |
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namespace MadWizard\WebAuthn\Crypto; |
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use MadWizard\WebAuthn\Format\ByteBuffer; |
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use MadWizard\WebAuthn\Format\CborEncoder; |
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use MadWizard\WebAuthn\Format\CborMap; |
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use MadWizard\WebAuthn\Format\DataValidator; |
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class RsaKey extends CoseKey |
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{ |
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/** |
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* RSA modulus n key type parameter (key type 3, RSA). |
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* |
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* @see https://www.iana.org/assignments/cose/cose.xhtml#key-type-parameters |
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*/ |
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private const KTP_N = -1; |
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/** |
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* RSA exponent e key type parameter (key type 3, RSA). |
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* |
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* @see https://www.iana.org/assignments/cose/cose.xhtml#key-type-parameters |
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*/ |
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private const KTP_E = -2; |
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/** |
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* RSA modulus. Unsigned integer value represented as binary buffer with leading zero bytes removed. |
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* |
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* @var ByteBuffer |
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*/ |
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private $modulus; |
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/** |
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* RSA exponent. Unsigned integer value represented as binary buffer with leading zero bytes removed. |
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* |
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* @var ByteBuffer |
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*/ |
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private $exponent; |
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private const SUPPORTED_ALGORITHMS = [ |
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CoseAlgorithm::RS256, |
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CoseAlgorithm::RS384, |
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CoseAlgorithm::RS512, |
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CoseAlgorithm::RS1, |
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]; |
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public function __construct(ByteBuffer $modulus, ByteBuffer $exponent, int $algorithm) |
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{ |
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parent::__construct($algorithm); |
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$this->modulus = $this->compactIntegerBuffer($modulus); |
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$this->exponent = $this->compactIntegerBuffer($exponent); |
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} |
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public static function fromCborData(CborMap $data): RsaKey |
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{ |
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DataValidator::checkMap( |
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$data, |
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[ |
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self::COSE_KEY_PARAM_KTY => 'integer', |
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self::COSE_KEY_PARAM_ALG => 'integer', |
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self::KTP_N => ByteBuffer::class, |
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self::KTP_E => ByteBuffer::class, |
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] |
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); |
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$algorithm = $data->get(self::COSE_KEY_PARAM_ALG); |
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$modulus = $data->get(self::KTP_N); |
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$exponent = $data->get(self::KTP_E); |
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return new RsaKey($modulus, $exponent, $algorithm); |
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} |
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public function verifySignature(ByteBuffer $data, ByteBuffer $signature): bool |
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{ |
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$verifier = new OpenSslVerifier($this->getAlgorithm()); |
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return $verifier->verify($data->getBinaryString(), $signature->getBinaryString(), $this->asPem()); |
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} |
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/** |
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* Removes all leading zero bytes from a ByteBuffer, but keeps one zero byte if it is the only byte left and the |
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* original buffer did not have zero length. |
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*/ |
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private function compactIntegerBuffer(ByteBuffer $buffer): ByteBuffer |
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{ |
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$length = $buffer->getLength(); |
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$raw = $buffer->getBinaryString(); |
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for ($i = 0; $i < ($length - 1); $i++) { |
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if (ord($raw[$i]) !== 0) { |
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break; |
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} |
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} |
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if ($i !== 0) { |
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return new ByteBuffer(\substr($raw, $i)); |
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} |
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return $buffer; |
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} |
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public function getModulus(): ByteBuffer |
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{ |
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return $this->modulus; |
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} |
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public function getExponent(): ByteBuffer |
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{ |
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return $this->exponent; |
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} |
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public function asDer(): string |
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{ |
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// DER encoded RSA key |
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return |
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Der::sequence( |
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Der::sequence( |
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Der::oid("\x2A\x86\x48\x86\xF7\x0D\x01\x01\x01") . // OID 1.2.840.113549.1.1.1 rsaEncryption |
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Der::nullValue() |
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) . |
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Der::bitString( |
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Der::sequence( |
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Der::unsignedInteger($this->modulus->getBinaryString()) . |
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Der::unsignedInteger($this->exponent->getBinaryString()) |
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) |
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) |
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); |
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} |
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public function getCbor(): ByteBuffer |
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{ |
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$map = [ |
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self::COSE_KEY_PARAM_KTY => self::COSE_KTY_RSA, |
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self::COSE_KEY_PARAM_ALG => $this->getAlgorithm(), |
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self::KTP_N => $this->modulus, |
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self::KTP_E => $this->exponent, |
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]; |
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return new ByteBuffer(CborEncoder::encodeMap(CborMap::fromArray($map))); |
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} |
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protected function algorithmSupported(int $algorithm): bool |
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{ |
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return in_array($algorithm, self::SUPPORTED_ALGORITHMS, true); |
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} |
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} |
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madwizard-org /
webauthn-server
