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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) 2014-2017 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 Assert\Assertion; |
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use Jose\Component\Encryption\Algorithm\ContentEncryptionAlgorithmInterface; |
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abstract class AESGCM implements ContentEncryptionAlgorithmInterface |
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{ |
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/** |
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* {@inheritdoc} |
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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): 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 .= '.'.$aad; |
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} |
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$keyLength = mb_strlen($cek, '8bit') * 8; |
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$this->checkKeyLength($keyLength); |
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$mode = sprintf('aes-%d-gcm', $keyLength); |
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$C = openssl_encrypt($data, $mode, $cek, OPENSSL_RAW_DATA, $iv, $tag, $calculated_aad); |
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Assertion::true(false !== $C, 'Unable to encrypt the data.'); |
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return $C; |
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} |
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/** |
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* {@inheritdoc} |
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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 .= '.'.$aad; |
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} |
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$keyLength = mb_strlen($cek, '8bit') * 8; |
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$this->checkKeyLength($keyLength); |
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$mode = 'aes-'.($keyLength).'-gcm'; |
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$P = openssl_decrypt($data, $mode, $cek, OPENSSL_RAW_DATA, $iv, $tag, $calculated_aad); |
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Assertion::true(false !== $P, 'Unable to decrypt or to verify the tag.'); |
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return $P; |
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} |
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/** |
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* @return int |
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*/ |
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public function getIVSize(): int |
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{ |
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return 96; |
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} |
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/** |
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* @return int |
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*/ |
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public function getCEKSize(): int |
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{ |
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return $this->getKeySize(); |
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} |
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/** |
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* @param int $keyLength |
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*/ |
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private function checkKeyLength(int $keyLength) |
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{ |
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if (!in_array($keyLength, [16, 24, 32])) { |
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throw new \InvalidArgumentException('Invalid key length. Allowed sizes are 128, 192 and 256 bits.'); |
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} |
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} |
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/** |
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* @return int |
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*/ |
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abstract protected function getKeySize(): int; |
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} |
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Spomky-Labs /
jose
