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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\Serializer; |
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use Base64Url\Base64Url; |
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use Jose\Component\Encryption\JWE; |
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use Jose\Component\Encryption\Recipient; |
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/** |
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* Class CompactSerializer. |
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*/ |
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final class CompactSerializer extends AbstractSerializer |
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{ |
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public const NAME = 'jwe_compact'; |
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/** |
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* {@inheritdoc} |
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*/ |
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public function name(): string |
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{ |
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return self::NAME; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function serialize(JWE $jwe, ?int $recipientIndex = null): string |
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{ |
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if (null === $recipientIndex) { |
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$recipientIndex = 0; |
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} |
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$recipient = $jwe->getRecipient($recipientIndex); |
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$this->checkHasNoAAD($jwe); |
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$this->checkHasSharedProtectedHeaders($jwe); |
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$this->checkRecipientHasNoHeaders($jwe, $recipientIndex); |
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return sprintf( |
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'%s.%s.%s.%s.%s', |
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$jwe->getEncodedSharedProtectedHeaders(), |
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Base64Url::encode(null === $recipient->getEncryptedKey() ? '' : $recipient->getEncryptedKey()), |
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Base64Url::encode(null === $jwe->getIV() ? '' : $jwe->getIV()), |
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Base64Url::encode($jwe->getCiphertext()), |
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Base64Url::encode(null === $jwe->getTag() ? '' : $jwe->getTag()) |
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); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function unserialize(string $input): JWE |
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{ |
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$parts = explode('.', $input); |
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if (5 !== count($parts)) { |
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throw new \InvalidArgumentException('Unsupported input'); |
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} |
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$encodedSharedProtectedHeader = $parts[0]; |
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$sharedProtectedHeader = json_decode(Base64Url::decode($encodedSharedProtectedHeader)); |
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$encryptedKey = empty($parts[1]) ? null : Base64Url::decode($parts[1]); |
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$iv = Base64Url::decode($parts[2]); |
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$ciphertext = Base64Url::decode($parts[3]); |
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$tag = Base64Url::decode($parts[4]); |
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return JWE::create( |
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$ciphertext, |
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$iv, |
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$tag, |
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null, |
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[], |
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$sharedProtectedHeader, |
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$encodedSharedProtectedHeader, |
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[Recipient::create([], $encryptedKey)]); |
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} |
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/** |
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* @param JWE $jwe |
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*/ |
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private function checkHasNoAAD(JWE $jwe) |
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{ |
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if (!empty($jwe->getAAD())) { |
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throw new \LogicException('This JWE has AAD and cannot be converted into Compact JSON.'); |
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} |
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} |
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/** |
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* @param JWE $jwe |
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* @param int $id |
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*/ |
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private function checkRecipientHasNoHeaders(JWE $jwe, int $id) |
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{ |
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if (!empty($jwe->getSharedHeaders()) || !empty($jwe->getRecipient($id)->getHeaders())) { |
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throw new \LogicException('This JWE has shared headers or recipient headers and cannot be converted into Compact JSON.'); |
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} |
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} |
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/** |
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* @param JWE $jwe |
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*/ |
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private function checkHasSharedProtectedHeaders(JWE $jwe) |
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{ |
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if (empty($jwe->getSharedProtectedHeaders())) { |
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throw new \LogicException('This JWE does not have shared protected headers and cannot be converted into Compact JSON.'); |
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} |
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} |
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} |
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Spomky-Labs /
jose
