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<?php declare(strict_types=1); |
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namespace Limoncello\Crypt; |
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/** |
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* Copyright 2015-2019 [email protected] |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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use Generator; |
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use Limoncello\Crypt\Exceptions\CryptException; |
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use function assert; |
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use function file_exists; |
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use function openssl_pkey_free; |
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use function openssl_pkey_get_details; |
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use function strlen; |
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use function substr; |
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/** |
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* @package Limoncello\Crypt |
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*/ |
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abstract class BaseAsymmetricCrypt extends BaseCrypt |
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{ |
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/** |
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* @var resource|null |
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*/ |
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private $key = null; |
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/** |
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* @var int|null |
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*/ |
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private $keyBytes = null; |
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/** |
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* Destructor. |
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*/ |
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public function __destruct() |
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{ |
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$this->closeKey(); |
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} |
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/** |
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* @return self |
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*/ |
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public function closeKey(): self |
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{ |
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if ($this->key !== null) { |
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openssl_pkey_free($this->key); |
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$this->key = null; |
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$this->keyBytes = null; |
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} |
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return $this; |
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} |
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/** |
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* @return resource|null |
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*/ |
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protected function getKey() |
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{ |
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return $this->key; |
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} |
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/** |
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* @param resource $key |
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* |
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* @return self |
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*/ |
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protected function setKey($key): self |
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{ |
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assert(is_resource($key) === true); |
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$this->closeKey(); |
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$this->key = $key; |
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return $this; |
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} |
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/** |
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* @return int|null |
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*/ |
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protected function getKeyBytes(): ?int |
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{ |
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if ($this->keyBytes === null && $this->getKey() !== null) { |
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$this->clearErrors(); |
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$details = openssl_pkey_get_details($this->getKey()); |
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$details !== false ?: $this->throwException(new CryptException($this->getErrorMessage())); |
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$this->keyBytes = $details['bits'] / 8; |
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} |
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return $this->keyBytes; |
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} |
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/** |
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* @return int|null |
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*/ |
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protected function getEncryptChunkSize(): ?int |
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{ |
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$keyBytes = $this->getKeyBytes(); |
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// 11 is a kind of magic number related to padding. |
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$result = $keyBytes === null ? null : $keyBytes - 11; |
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return $result; |
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} |
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/** |
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* @return int|null |
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*/ |
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protected function getDecryptChunkSize(): ?int |
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{ |
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$keyBytes = $this->getKeyBytes(); |
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$result = $keyBytes === null ? null : $keyBytes; |
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return $result; |
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} |
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/** |
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* @param string $value |
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* @param int $maxSize |
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* |
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* @return Generator |
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*/ |
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protected function chunkString(string $value, int $maxSize): Generator |
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{ |
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$isValidInput = $maxSize > 0; |
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assert($isValidInput === true); |
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if ($isValidInput === true) { |
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$start = 0; |
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$length = strlen($value); |
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if ($length === 0) { |
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yield $value; |
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} |
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while ($start < $length) { |
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yield substr($value, $start, $maxSize); |
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$start += $maxSize; |
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} |
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} |
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} |
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/** |
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* @param string $path |
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* |
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* @return bool |
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*/ |
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protected function checkIfPathToFileCheckPrefix(string $path): bool |
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{ |
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if (file_exists($path) === true) { |
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return substr($path, 0, 7) === 'file://'; |
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} |
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return true; |
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} |
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} |
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This check compares the return type specified in the
@returnannotation of a function or method doc comment with the types returned by the function and raises an issue if they mismatch.