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| 1 | <?php |
| 2 | |
| 3 | namespace MediaWiki\CheckUser; |
| 4 | |
| 5 | class EncryptedData { |
| 6 | |
| 7 | /** @var string|null The data symmetrically encrypted with a random key */ |
| 8 | public $encString; |
| 9 | |
| 10 | /** @var string|null Symmetric key, encrypted with the public key */ |
| 11 | public $envKeys; |
| 12 | |
| 13 | /** |
| 14 | * @var string algorithm name, passed into openssl 'method' param. Kept as a variable here in case |
| 15 | * the class definition needs to change, and we have serialized objects stored. |
| 16 | */ |
| 17 | private $algName; |
| 18 | |
| 19 | /** |
| 20 | * @var int Hash of the public key, in case you've used multiple keys, and need to identify the |
| 21 | * correct private key |
| 22 | */ |
| 23 | private $keyHash; |
| 24 | |
| 25 | /** |
| 26 | * Create an EncryptedData object from |
| 27 | * |
| 28 | * @param mixed $data Data/object to be encryted |
| 29 | * @param string $publicKey Public key for encryption |
| 30 | * @param string $algorithmName |
| 31 | */ |
| 32 | public function __construct( $data, $publicKey, $algorithmName = 'rc4' ) { |
| 33 | $this->keyHash = crc32( $publicKey ); |
| 34 | $this->algName = $algorithmName; |
| 35 | $this->encryptData( serialize( $data ), $publicKey ); |
| 36 | } |
| 37 | |
| 38 | /** |
| 39 | * Decrypt the text in this object |
| 40 | * |
| 41 | * @param string $privateKey String with ascii-armored block, |
| 42 | * or the return of openssl_get_privatekey |
| 43 | * @return string|false plaintext |
| 44 | */ |
| 45 | public function getPlaintext( $privateKey ) { |
| 46 | $result = \openssl_open( |
| 47 | $this->encString, |
| 48 | $plaintextData, |
| 49 | $this->envKeys, |
| 50 | $privateKey, |
| 51 | $this->algName |
| 52 | ); |
| 53 | |
| 54 | if ( !$result ) { |
| 55 | return false; |
| 56 | } |
| 57 | |
| 58 | return unserialize( $plaintextData ); |
| 59 | } |
| 60 | |
| 61 | /** |
| 62 | * Encrypt data with a public key |
| 63 | * |
| 64 | * @param string $data |
| 65 | * @param string $publicKey String with ascii-armored block, |
| 66 | * or the return of openssl_get_publickey |
| 67 | */ |
| 68 | private function encryptData( $data, $publicKey ) { |
| 69 | // @phan-suppress-next-line PhanTypeMismatchArgumentInternal |
| 70 | \openssl_seal( $data, $encryptedString, $envelopeKeys, [ $publicKey ], $this->algName ); |
| 71 | $this->encString = $encryptedString; |
| 72 | // @phan-suppress-next-line PhanTypeArraySuspiciousNullable |
| 73 | $this->envKeys = $envelopeKeys[0]; |
| 74 | } |
| 75 | } |