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<?php |
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declare(strict_types=1); |
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/* |
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* The MIT License (MIT) |
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* |
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* Copyright (c) 2014-2019 Spomky-Labs |
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* |
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* This software may be modified and distributed under the terms |
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* of the MIT license. See the LICENSE file for details. |
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*/ |
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namespace Jose\Component\Encryption\Algorithm\ContentEncryption; |
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use Jose\Component\Encryption\Algorithm\ContentEncryptionAlgorithm; |
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use RuntimeException; |
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abstract class AESCCM implements ContentEncryptionAlgorithm |
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{ |
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public function allowedKeyTypes(): array |
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{ |
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return []; //Irrelevant |
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} |
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/** |
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* @throws RuntimeException if the data cannot be encrypted |
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*/ |
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public function encryptContent(string $data, string $cek, string $iv, ?string $aad, string $encoded_protected_header, ?string &$tag = null): string |
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{ |
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$calculated_aad = $encoded_protected_header; |
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if (null !== $aad) { |
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$calculated_aad .= '.'.$aad; |
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} |
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$tag = ''; |
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$result = openssl_encrypt($data, $this->getMode(), $cek, OPENSSL_RAW_DATA, $iv, $tag, $calculated_aad, $this->getTagLength()); |
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if (false === $result) { |
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throw new RuntimeException('Unable to encrypt the content'); |
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} |
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return $result; |
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} |
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/** |
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* @throws RuntimeException if the data cannot be decrypted |
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*/ |
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public function decryptContent(string $data, string $cek, string $iv, ?string $aad, string $encoded_protected_header, string $tag): string |
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{ |
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$calculated_aad = $encoded_protected_header; |
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if (null !== $aad) { |
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$calculated_aad .= '.'.$aad; |
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} |
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$result = openssl_decrypt($data, $this->getMode(), $cek, OPENSSL_RAW_DATA, $iv, $tag, $calculated_aad); |
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if (false === $result) { |
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throw new RuntimeException('Unable to decrypt the content'); |
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} |
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return $result; |
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} |
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abstract protected function getMode(): string; |
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abstract protected function getTagLength(): int; |
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} |
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