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<?php |
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/* |
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* This file is part of the DUKPT package. |
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* |
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* Copyright (c) 2016-2017 Tonic Health <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace TonicForHealth\DUKPT\Device; |
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use TonicForHealth\DUKPT\DUKPTFactory; |
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use TonicForHealth\DUKPT\Helper\Encryption\EncryptionHelperInterface; |
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use TonicForHealth\DUKPT\Key\BaseDerivationKeyFactory; |
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use TonicForHealth\DUKPT\Key\DerivedKey; |
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use TonicForHealth\DUKPT\Key\DerivedKeyFactory; |
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use TonicForHealth\DUKPT\Key\InitialPinEncryptionKeyFactory; |
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use TonicForHealth\DUKPT\Key\KeySerialNumberFactory; |
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/** |
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* Class AbstractDevice |
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* |
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* @author Vitalii Ekert <[email protected]> |
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*/ |
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abstract class AbstractDevice implements DeviceInterface |
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{ |
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/** |
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* @var BaseDerivationKeyFactory |
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*/ |
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protected $bdkFactory; |
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/** |
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* @var KeySerialNumberFactory |
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*/ |
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protected $ksnFactory; |
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/** |
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* @var InitialPinEncryptionKeyFactory |
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*/ |
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protected $ipekFactory; |
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/** |
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* @var DerivedKeyFactory |
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*/ |
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protected $derivedKeyFactory; |
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/** |
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* @var EncryptionHelperInterface |
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*/ |
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protected $encryptionHelper; |
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/** |
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* @var string |
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*/ |
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protected $sessionKey; |
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/** |
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* {@inheritdoc} |
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*/ |
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public function __construct(DUKPTFactory $factory) |
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{ |
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$this->bdkFactory = $factory->createBDKFactory(); |
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$this->ksnFactory = $factory->createKSNFactory(); |
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$this->ipekFactory = $factory->createIPEKFactory(); |
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$this->derivedKeyFactory = $factory->createDerivedKeyFactory(); |
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$this->encryptionHelper = $this->createEncryptionHelper(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function load($hexBDK, $hexKSN) |
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{ |
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$bdk = $this->bdkFactory->createFromHexadecimal($hexBDK); |
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$ksn = $this->ksnFactory->createFromHexadecimal($hexKSN); |
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$ipek = $this->ipekFactory->create($bdk, $ksn); |
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$derivedKey = $this->derivedKeyFactory->create($ksn, $ipek); |
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$this->sessionKey = $this->createSessionKey($derivedKey); |
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return $this; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getSessionKey() |
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{ |
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return $this->sessionKey; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function decrypt($cipherText) |
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{ |
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if (!$this->hasEvenLength($cipherText)) { |
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throw new \InvalidArgumentException('Hexadecimal input string must have an even length.'); |
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} |
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return $this->encryptionHelper->decrypt($this->sessionKey, hex2bin($cipherText)); |
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} |
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/** |
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* @return EncryptionHelperInterface |
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*/ |
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abstract protected function createEncryptionHelper(); |
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/** |
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* @param DerivedKey $derivedKey |
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* |
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* @return string |
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*/ |
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abstract protected function createSessionKey(DerivedKey $derivedKey); |
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/** |
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* Returns TRUE if the string has an even length. |
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* |
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* @param string $string |
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* |
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* @return bool |
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*/ |
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private function hasEvenLength($string) |
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{ |
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return 0 === strlen($string) %2; |
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} |
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} |
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tonicforhealth /
dukpt
