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<?php |
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/** |
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* Copyright 2020 SURFnet B.V. |
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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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namespace Surfnet\StepupSelfService\SelfServiceBundle\Service\RemoteVetting\Encryption; |
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use RobRichards\XMLSecLibs\XMLSecurityKey; |
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use Surfnet\StepupSelfService\SelfServiceBundle\Exception\InvalidArgumentException; |
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use Surfnet\StepupSelfService\SelfServiceBundle\Service\RemoteVetting\Configuration\RemoteVettingConfiguration; |
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use Surfnet\StepupSelfService\SelfServiceBundle\Service\RemoteVetting\Dto\AttributeListDto; |
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use Surfnet\StepupSelfService\SelfServiceBundle\Service\RemoteVetting\Value\AttributeCollectionInterface; |
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class IdentityEncrypter implements IdentityEncrypterInterface |
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{ |
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/** |
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* @var RemoteVettingConfiguration $configuration |
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*/ |
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private $configuration; |
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/** |
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* @var IdentityWriterInterface |
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*/ |
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private $writer; |
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public function __construct(RemoteVettingConfiguration $configuration, IdentityWriterInterface $writer) |
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{ |
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$this->configuration = $configuration; |
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$this->writer = $writer; |
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} |
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public function encrypt($data) |
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{ |
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$rsaPublicKey = $this->configuration->getPublicKey(); |
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if (!is_string($data) || !is_string($rsaPublicKey)) { |
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// Invalid argument |
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throw new InvalidArgumentException('Invalid input was provided to the encrypt method'); |
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} |
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// Use AES-256 in GCM |
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$symmetricAlgorithm = 'aes-256-gcm'; |
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// Generate initialisation vector for the symmetric encryption algorithm |
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$ivLength = openssl_cipher_iv_length($symmetricAlgorithm); |
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if (false === $ivLength) { |
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// Error generating key |
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throw new InvalidArgumentException( |
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'Unable to generate an initialization vector (iv) based on the selected symmetric encryption algorithm' |
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); |
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} |
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$iv = openssl_random_pseudo_bytes($ivLength); |
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if (false === $iv) { |
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// Error generating key |
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throw new InvalidArgumentException('Unable to generate a correct initialization vector (iv)'); |
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} |
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// Generate a 256 bits AES key |
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$secretKey = openssl_random_pseudo_bytes(256 / 8); |
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if (false === $secretKey) { |
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// Error generating key |
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throw new InvalidArgumentException('Unable to generate the secret key'); |
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} |
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// Encrypt the data |
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$tag = ''; |
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$ciphertext = openssl_encrypt($data, $symmetricAlgorithm, $secretKey, 0, $iv, $tag); |
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if (false === $ciphertext) { |
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// Encryption failed |
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throw new InvalidArgumentException( |
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sprintf('Unable to encrypt the data, ssl error: "%s"', openssl_error_string()) |
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); |
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} |
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// Encrypt symmetric key |
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$rsaPublicKeyHandle = openssl_pkey_get_public($rsaPublicKey); |
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if (false === $rsaPublicKeyHandle) { |
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// Reading RSA public key failed |
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throw new InvalidArgumentException('Reading RSA public key failed'); |
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} |
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$encryptedKey = ''; |
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$res = openssl_public_encrypt($secretKey, $encryptedKey, $rsaPublicKeyHandle, OPENSSL_PKCS1_OAEP_PADDING); |
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if (false === $res) { |
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// Key encryption failed |
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openssl_pkey_free($rsaPublicKeyHandle); |
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throw new InvalidArgumentException('Key encryption failed'); |
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} |
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openssl_pkey_free($rsaPublicKeyHandle); |
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$output = json_encode( |
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[ |
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'algorithm' => $symmetricAlgorithm, |
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'iv' => base64_encode($iv), |
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'tag' => base64_encode($tag), |
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'ciphertext' => base64_encode($ciphertext), |
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'encrypted_key' => base64_encode($encryptedKey), |
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] |
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); |
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$this->writer->write($output); |
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} |
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} |
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OpenConext /
Stepup-SelfService
