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<?php |
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/* |
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* The MIT License (MIT) |
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* |
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* Copyright (c) 2014-2015 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; |
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use Base64Url\Base64Url; |
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use Jose\Algorithm\JWAManagerInterface; |
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use Jose\Algorithm\Signature\SignatureInterface; |
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use Jose\Behaviour\HasJWAManager; |
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use Jose\Behaviour\HasKeyChecker; |
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use Jose\Behaviour\HasPayloadConverter; |
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use Jose\Object\JWKInterface; |
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use Jose\Object\SignatureInstructionInterface; |
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use Jose\Payload\PayloadConverterManagerInterface; |
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use Jose\Util\Converter; |
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/** |
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*/ |
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final class Signer implements SignerInterface |
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{ |
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use HasKeyChecker; |
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use HasJWAManager; |
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use HasPayloadConverter; |
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/** |
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* Signer constructor. |
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* |
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* @param \Jose\Algorithm\JWAManagerInterface $jwa_manager |
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* @param \Jose\Payload\PayloadConverterManagerInterface $payload_converter_manager |
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*/ |
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public function __construct( |
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JWAManagerInterface $jwa_manager, |
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PayloadConverterManagerInterface $payload_converter_manager |
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) { |
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$this->setJWAManager($jwa_manager); |
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$this->setPayloadConverter($payload_converter_manager); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function sign($input, array $instructions, $serialization = JSONSerializationModes::JSON_COMPACT_SERIALIZATION, $detached_signature = false, &$detached_payload = null) |
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{ |
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$additional_header = []; |
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$input = $this->getPayloadConverter()->convertPayloadToString($additional_header, $input); |
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$this->checkInstructions($instructions, $serialization); |
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$jwt_payload = Base64Url::encode($input); |
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$signatures = [ |
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'payload' => $jwt_payload, |
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'signatures' => [], |
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]; |
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foreach ($instructions as $instruction) { |
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$signatures['signatures'][] = $this->computeSignature($instruction, $jwt_payload, $additional_header); |
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} |
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if (true === $detached_signature) { |
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$detached_payload = $signatures['payload']; |
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unset($signatures['payload']); |
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} |
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$prepared = Converter::convert($signatures, $serialization); |
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return is_array($prepared) ? current($prepared) : $prepared; |
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} |
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/** |
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* @param \Jose\Object\SignatureInstructionInterface $instruction |
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* @param string $jwt_payload |
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* @param array $additional_header |
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* |
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* @return array |
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*/ |
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protected function computeSignature(SignatureInstructionInterface $instruction, $jwt_payload, array $additional_header) |
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{ |
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$protected_header = array_merge($instruction->getProtectedHeader(), $additional_header); |
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$unprotected_header = $instruction->getUnprotectedHeader(); |
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$complete_header = array_merge($protected_header, $protected_header); |
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$jwt_protected_header = empty($protected_header) ? null : Base64Url::encode(json_encode($protected_header)); |
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$signature_algorithm = $this->getSignatureAlgorithm($complete_header, $instruction->getKey()); |
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if (!$this->checkKeyUsage($instruction->getKey(), 'signature')) { |
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throw new \InvalidArgumentException('Key cannot be used to sign'); |
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} |
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$signature = $signature_algorithm->sign($instruction->getKey(), $jwt_protected_header.'.'.$jwt_payload); |
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$jwt_signature = Base64Url::encode($signature); |
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$result = [ |
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'signature' => $jwt_signature, |
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]; |
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if (null !== $protected_header) { |
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$result['protected'] = $jwt_protected_header; |
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} |
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if (!empty($unprotected_header)) { |
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$result['header'] = $unprotected_header; |
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} |
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return $result; |
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} |
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/** |
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* @param array $complete_header The complete header |
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* @param \Jose\Object\JWKInterface $key |
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* |
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* @return \Jose\Algorithm\Signature\SignatureInterface |
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*/ |
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protected function getSignatureAlgorithm(array $complete_header, JWKInterface $key) |
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{ |
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if (!array_key_exists('alg', $complete_header)) { |
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throw new \InvalidArgumentException('No "alg" parameter set in the header.'); |
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} |
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if ($key->has('alg') && $key->get('alg') !== $complete_header['alg']) { |
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throw new \InvalidArgumentException(sprintf('The algorithm "%s" is allowed with this key.', $complete_header['alg'])); |
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} |
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$signature_algorithm = $this->getJWAManager()->getAlgorithm($complete_header['alg']); |
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if (!$signature_algorithm instanceof SignatureInterface) { |
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throw new \InvalidArgumentException(sprintf('The algorithm "%s" is not supported.', $complete_header['alg'])); |
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} |
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return $signature_algorithm; |
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} |
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/** |
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* @param \Jose\Object\EncryptionInstructionInterface[] $instructions |
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* @param string $serialization |
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*/ |
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protected function checkInstructions(array $instructions, $serialization) |
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{ |
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if (empty($instructions)) { |
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throw new \InvalidArgumentException('No instruction.'); |
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} |
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if (count($instructions) > 1 && JSONSerializationModes::JSON_SERIALIZATION !== $serialization) { |
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throw new \InvalidArgumentException('Only one instruction authorized when Compact or Flattened Serialization Overview is selected.'); |
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} |
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foreach ($instructions as $instruction) { |
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if (!$instruction instanceof SignatureInstructionInterface) { |
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throw new \InvalidArgumentException('Bad instruction. Must implement SignatureInstructionInterface.'); |
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} |
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} |
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} |
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} |
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Spomky-Labs /
jose
