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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\Key; |
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use TonicForHealth\DUKPT\Helper\Encryption\TripleDESEncryptionHelper; |
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/** |
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* Class InitialPinEncryptionKeyFactory |
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* |
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* @author Vitalii Ekert <[email protected]> |
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*/ |
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class InitialPinEncryptionKeyFactory implements KeyFactoryInterface |
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{ |
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const ENCRYPTION_INIT_KSN_BYTES = 8; |
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const ENCRYPTION_LOWER_KEY_MASK = 'C0C0C0C000000000C0C0C0C000000000'; |
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/** |
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* @var TripleDESEncryptionHelper |
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*/ |
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protected $encryptionHelper; |
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/** |
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* InitialPinEncryptionKeyFactory constructor. |
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* |
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* @param TripleDESEncryptionHelper $encryptionHelper |
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*/ |
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public function __construct(TripleDESEncryptionHelper $encryptionHelper) |
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{ |
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$this->encryptionHelper = $encryptionHelper; |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* @return InitialPinEncryptionKey |
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*/ |
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public function createFromHexadecimal($hexKey) |
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{ |
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return new InitialPinEncryptionKey(hex2bin($hexKey)); |
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} |
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/** |
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* Returns a key from BDK and KSN |
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* |
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* @param BaseDerivationKey $bdk |
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* @param KeySerialNumber $ksn |
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* |
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* @throws \InvalidArgumentException If the provided key has a wrong size |
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* |
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* @return InitialPinEncryptionKey |
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*/ |
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public function create(BaseDerivationKey $bdk, KeySerialNumber $ksn) |
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{ |
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$binBDK = $bdk->toBinary(); |
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$binInitKSN = $ksn->getInitialKey(); |
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$binInitKSNUpperBytes = substr($binInitKSN, 0, self::ENCRYPTION_INIT_KSN_BYTES); |
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$binUpperKey = $binBDK; |
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$binLowerKey = $binBDK ^ hex2bin(self::ENCRYPTION_LOWER_KEY_MASK); |
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$binUpperBytes = $this->encryptionHelper->encrypt($binUpperKey, $binInitKSNUpperBytes); |
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$binLowerBytes = $this->encryptionHelper->encrypt($binLowerKey, $binInitKSNUpperBytes); |
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$binKey = $binUpperBytes.$binLowerBytes; |
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return new InitialPinEncryptionKey($binKey); |
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} |
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} |
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tonicforhealth /
dukpt
