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<?php |
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namespace ByTIC\Omnipay\Twispay; |
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/** |
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* Class Helper |
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* @package ByTIC\Omnipay\Twispay |
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*/ |
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class Helper |
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{ |
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/** |
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* @param array $data |
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* @param string $key |
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* @return string |
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*/ |
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public static function generateChecksum(array $data, string $key) |
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{ |
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unset($data['checksum']); |
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self::recursiveKeySort($data); |
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$query = http_build_query($data); |
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$encoded = hash_hmac('sha512', $query, $key, true); |
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return base64_encode($encoded); |
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} |
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/** |
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* @param array $data |
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*/ |
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private static function recursiveKeySort(array &$data) |
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{ |
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ksort($data, SORT_STRING); |
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foreach ($data as $key => $value) { |
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if (is_array($value)) { |
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self::recursiveKeySort($data[$key]); |
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} |
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} |
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} |
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/** |
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* @param string $encrypted |
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* @param $key |
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* @return null|string |
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* @throws \Exception |
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*/ |
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public static function decrypt(string $encrypted, $key) |
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{ |
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if (strpos($encrypted, ',') !== false) { |
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$encryptedParts = explode(',', $encrypted, 2); |
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$iv = base64_decode($encryptedParts[0]); |
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if ($iv === false) { |
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throw new \Exception('Invalid encryption iv'); |
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} |
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$encrypted = base64_decode($encryptedParts[1]); |
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if ($encrypted === false) { |
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throw new \Exception('Invalid encrypted data'); |
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} |
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$decrypted = openssl_decrypt($encrypted, 'aes-256-cbc', $key, OPENSSL_RAW_DATA, $iv); |
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if ($decrypted === false) { |
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throw new \Exception('Cannot decrypt data'); |
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} |
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return $decrypted; |
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} |
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return null; |
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} |
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} |
ByTIC /
omnipay-twispay
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