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<?php |
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namespace Jsq\Cache; |
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use Psr\Cache\CacheItemInterface; |
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class EnvelopeEncryptingItemDecorator extends EncryptingItemDecorator |
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{ |
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/** @var resource */ |
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private $publicKey; |
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/** @var resource */ |
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private $privateKey; |
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171 |
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public function __construct( |
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CacheItemInterface $decorated, |
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$certificate, |
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$key, |
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$passPhrase, |
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$cipher |
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) { |
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parent::__construct($decorated, $cipher); |
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$this->setPublicKey($certificate); |
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$this->setPrivateKey($key, $passPhrase); |
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} |
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public function __destruct() |
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{ |
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openssl_pkey_free($this->publicKey); |
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openssl_pkey_free($this->privateKey); |
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} |
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protected function isDecryptable() |
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{ |
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$data = $this->getDecorated()->get(); |
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return $data instanceof EnvelopeEncryptedValue |
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&& $this->validateSignature( |
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$this->getKey() . $data->getCipherText(), |
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$data->getSignature() |
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); |
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} |
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protected function encrypt($data) |
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{ |
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$key = $this->generateIv(); |
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$iv = $this->generateIv(); |
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$cipherText = $this->encryptString(serialize($data), $key, $iv); |
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return new EnvelopeEncryptedValue( |
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$cipherText, |
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$this->getCipherMethod(), |
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$iv, |
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$this->encryptEnvelopeKey($key), |
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$this->signString($this->getKey() . $cipherText) |
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); |
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} |
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protected function decrypt(EncryptedValue $data) |
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{ |
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if (!$data instanceof EnvelopeEncryptedValue) return null; |
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return unserialize($this->decryptString( |
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$data->getCipherText(), |
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$data->getMethod(), |
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$this->decryptEnvelopeKey($data->getEnvelopeKey()), |
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$data->getInitializationVector() |
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)); |
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} |
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private function setPublicKey($cert) |
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{ |
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$publicKey = @openssl_pkey_get_public($cert); |
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if (!$this->validateOpenSslKey($publicKey)) { |
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throw new InvalidArgumentException('Unable to create public key' |
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. ' from provided certificate. Certificate must be a valid x509' |
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. ' certificate, a PEM encoded certificate, or a path to a file' |
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. ' containing a PEM encoded certificate.'); |
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} |
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$this->publicKey = $publicKey; |
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} |
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private function setPrivateKey($key, $passPhrase) |
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{ |
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$this->privateKey = @openssl_pkey_get_private($key, $passPhrase); |
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if (!$this->validateOpenSslKey($this->privateKey)) { |
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throw new InvalidArgumentException('Unable to create private key' |
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. ' from provided key. Key must be a PEM encoded private key or' |
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. ' a path to a file containing a PEM encoded private key.'); |
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} |
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} |
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private function validateOpenSslKey($key) |
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{ |
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return is_resource($key) && 'OpenSSL key' === get_resource_type($key); |
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} |
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private function signString($string) |
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{ |
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openssl_sign($string, $signature, $this->privateKey); |
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return $signature; |
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} |
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private function validateSignature($signed, $signature) |
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{ |
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return openssl_verify($signed, $signature, $this->publicKey); |
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} |
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private function encryptEnvelopeKey($key) |
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{ |
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openssl_public_encrypt($key, $sealedKey, $this->publicKey); |
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return $sealedKey; |
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} |
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private function decryptEnvelopeKey($sealedKey) |
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{ |
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openssl_private_decrypt($sealedKey, $key, $this->privateKey); |
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return $key; |
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} |
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} |
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jeskew /
psr6-encrypting-decorator
