Merge pull request #4352 from owncloud/encryption_clean_up
crypt.php clean up
This commit is contained in:
Björn Schießle
commit
d3e2f31ada
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@ -30,9 +30,6 @@ use OC\Files\Filesystem;
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*/
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class Hooks {
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// TODO: use passphrase for encrypting private key that is separate to
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// the login password
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/**
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* @brief Startup encryption backend upon user login
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* @note This method should never be called for users using client side encryption
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@ -25,7 +25,6 @@
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namespace OCA\Encryption;
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//require_once '../3rdparty/Crypt_Blowfish/Blowfish.php';
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require_once realpath(dirname(__FILE__) . '/../3rdparty/Crypt_Blowfish/Blowfish.php');
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/**
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@ -86,7 +85,7 @@ class Crypt {
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* blocks with encryption alone, hence padding is added to achieve the
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* required length.
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*/
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public static function addPadding($data) {
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private static function addPadding($data) {
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$padded = $data . 'xx';
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@ -99,7 +98,7 @@ class Crypt {
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* @param string $padded padded data to remove padding from
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* @return string unpadded data on success, false on error
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*/
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public static function removePadding($padded) {
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private static function removePadding($padded) {
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if (substr($padded, -2) === 'xx') {
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@ -207,7 +206,7 @@ class Crypt {
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* @param string $passphrase
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* @return string encrypted file content
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*/
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public static function encrypt($plainContent, $iv, $passphrase = '') {
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private static function encrypt($plainContent, $iv, $passphrase = '') {
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if ($encryptedContent = openssl_encrypt($plainContent, 'AES-128-CFB', $passphrase, false, $iv)) {
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return $encryptedContent;
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@ -228,7 +227,7 @@ class Crypt {
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* @throws \Exception
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* @return string decrypted file content
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*/
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public static function decrypt($encryptedContent, $iv, $passphrase) {
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private static function decrypt($encryptedContent, $iv, $passphrase) {
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if ($plainContent = openssl_decrypt($encryptedContent, 'AES-128-CFB', $passphrase, false, $iv)) {
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@ -248,7 +247,7 @@ class Crypt {
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* @param string $iv IV to be concatenated
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* @returns string concatenated content
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*/
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public static function concatIv($content, $iv) {
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private static function concatIv($content, $iv) {
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$combined = $content . '00iv00' . $iv;
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@ -261,7 +260,7 @@ class Crypt {
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* @param string $catFile concatenated data to be split
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* @returns array keys: encrypted, iv
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*/
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public static function splitIv($catFile) {
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private static function splitIv($catFile) {
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// Fetch encryption metadata from end of file
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$meta = substr($catFile, -22);
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@ -378,34 +377,6 @@ class Crypt {
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}
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/**
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* @brief Creates symmetric keyfile content using a generated key
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* @param string $plainContent content to be encrypted
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* @returns array keys: key, encrypted
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* @note symmetricDecryptFileContent() can be used to decrypt files created using this method
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*
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* This function decrypts a file
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*/
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public static function symmetricEncryptFileContentKeyfile($plainContent) {
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$key = self::generateKey();
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if ($encryptedContent = self::symmetricEncryptFileContent($plainContent, $key)) {
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return array(
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'key' => $key,
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'encrypted' => $encryptedContent
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);
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} else {
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return false;
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}
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}
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/**
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* @brief Create asymmetrically encrypted keyfile content using a generated key
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* @param string $plainContent content to be encrypted
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@ -488,43 +459,11 @@ class Crypt {
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}
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/**
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* @brief Asymetrically encrypt a string using a public key
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* @param $plainContent
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* @param $publicKey
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* @return string encrypted file
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*/
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public static function keyEncrypt($plainContent, $publicKey) {
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openssl_public_encrypt($plainContent, $encryptedContent, $publicKey);
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return $encryptedContent;
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}
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/**
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* @brief Asymetrically decrypt a file using a private key
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* @param $encryptedContent
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* @param $privatekey
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* @return string decrypted file
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*/
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public static function keyDecrypt($encryptedContent, $privatekey) {
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$result = @openssl_private_decrypt($encryptedContent, $plainContent, $privatekey);
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if ($result) {
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return $plainContent;
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}
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return $result;
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}
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/**
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* @brief Generates a pseudo random initialisation vector
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* @return String $iv generated IV
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*/
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public static function generateIv() {
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private static function generateIv() {
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if ($random = openssl_random_pseudo_bytes(12, $strong)) {
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@ -550,7 +489,7 @@ class Crypt {
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}
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/**
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* @brief Generate a pseudo random 1024kb ASCII key
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* @brief Generate a pseudo random 1024kb ASCII key, used as file key
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* @returns $key Generated key
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*/
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public static function generateKey() {
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@ -576,13 +515,13 @@ class Crypt {
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}
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/**
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* @brief Get the blowfish encryption handeler for a key
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* @brief Get the blowfish encryption handler for a key
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* @param $key string (optional)
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* @return \Crypt_Blowfish blowfish object
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*
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* if the key is left out, the default handeler will be used
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* if the key is left out, the default handler will be used
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*/
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public static function getBlowfish($key = '') {
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private static function getBlowfish($key = '') {
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if ($key) {
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@ -596,38 +535,6 @@ class Crypt {
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}
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/**
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* @param $passphrase
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* @return mixed
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*/
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public static function legacyCreateKey($passphrase) {
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// Generate a random integer
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$key = mt_rand(10000, 99999) . mt_rand(10000, 99999) . mt_rand(10000, 99999) . mt_rand(10000, 99999);
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// Encrypt the key with the passphrase
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$legacyEncKey = self::legacyEncrypt($key, $passphrase);
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return $legacyEncKey;
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}
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/**
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* @brief encrypts content using legacy blowfish system
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* @param string $content the cleartext message you want to encrypt
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* @param string $passphrase
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* @returns string encrypted content
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*
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* This function encrypts an content
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*/
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public static function legacyEncrypt($content, $passphrase = '') {
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$bf = self::getBlowfish($passphrase);
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return $bf->encrypt($content);
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}
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/**
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* @brief decrypts content using legacy blowfish system
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* @param string $content the cleartext message you want to decrypt
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@ -21,30 +21,6 @@
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*
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*/
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# Bugs
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# ----
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# Sharing a file to a user without encryption set up will not provide them with access but won't notify the sharer
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# Sharing all files to admin for recovery purposes still in progress
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# Possibly public links are broken (not tested since last merge of master)
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# Missing features
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# ----------------
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# Make sure user knows if large files weren't encrypted
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# Test
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# ----
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# Test that writing files works when recovery is enabled, and sharing API is disabled
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# Test trashbin support
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// Old Todo:
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// - Crypt/decrypt button in the userinterface
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// - Setting if crypto should be on by default
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// - Add a setting "Don´t encrypt files larger than xx because of performance
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// reasons"
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namespace OCA\Encryption;
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/**
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@ -57,45 +33,6 @@ namespace OCA\Encryption;
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class Util {
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// Web UI:
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//// DONE: files created via web ui are encrypted
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//// DONE: file created & encrypted via web ui are readable in web ui
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//// DONE: file created & encrypted via web ui are readable via webdav
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// WebDAV:
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//// DONE: new data filled files added via webdav get encrypted
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//// DONE: new data filled files added via webdav are readable via webdav
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//// DONE: reading unencrypted files when encryption is enabled works via
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//// webdav
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//// DONE: files created & encrypted via web ui are readable via webdav
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// Legacy support:
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//// DONE: add method to check if file is encrypted using new system
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//// DONE: add method to check if file is encrypted using old system
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//// DONE: add method to fetch legacy key
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//// DONE: add method to decrypt legacy encrypted data
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// Admin UI:
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//// DONE: changing user password also changes encryption passphrase
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//// TODO: add support for optional recovery in case of lost passphrase / keys
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//// TODO: add admin optional required long passphrase for users
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//// TODO: implement flag system to allow user to specify encryption by folder, subfolder, etc.
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// Integration testing:
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//// TODO: test new encryption with versioning
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//// DONE: test new encryption with sharing
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//// TODO: test new encryption with proxies
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const MIGRATION_COMPLETED = 1; // migration to new encryption completed
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const MIGRATION_IN_PROGRESS = -1; // migration is running
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const MIGRATION_OPEN = 0; // user still needs to be migrated
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@ -878,46 +815,22 @@ class Util {
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}
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/**
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* @brief Decrypt a keyfile without knowing how it was encrypted
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* @brief Decrypt a keyfile
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* @param string $filePath
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* @param string $fileOwner
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* @param string $privateKey
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* @return bool|string
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* @note Checks whether file was encrypted with openssl_seal or
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* openssl_encrypt, and decrypts accrdingly
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* @note This was used when 2 types of encryption for keyfiles was used,
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* but now we've switched to exclusively using openssl_seal()
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*/
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public function decryptUnknownKeyfile($filePath, $fileOwner, $privateKey) {
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private function decryptKeyfile($filePath, $privateKey) {
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// Get the encrypted keyfile
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// NOTE: the keyfile format depends on how it was encrypted! At
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// this stage we don't know how it was encrypted
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$encKeyfile = Keymanager::getFileKey($this->view, $this->userId, $filePath);
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// We need to decrypt the keyfile
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// Has the file been shared yet?
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if (
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$this->userId === $fileOwner
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&& !Keymanager::getShareKey($this->view, $this->userId, $filePath) // NOTE: we can't use isShared() here because it's a post share hook so it always returns true
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) {
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// The file has a shareKey and must use it for decryption
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$shareKey = Keymanager::getShareKey($this->view, $this->userId, $filePath);
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// The file has no shareKey, and its keyfile must be
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// decrypted conventionally
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$plainKeyfile = Crypt::keyDecrypt($encKeyfile, $privateKey);
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} else {
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// The file has a shareKey and must use it for decryption
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$shareKey = Keymanager::getShareKey($this->view, $this->userId, $filePath);
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$plainKeyfile = Crypt::multiKeyDecrypt($encKeyfile, $shareKey, $privateKey);
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}
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$plainKeyfile = Crypt::multiKeyDecrypt($encKeyfile, $shareKey, $privateKey);
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return $plainKeyfile;
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}
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/**
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@ -956,7 +869,7 @@ class Util {
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$fileOwner = \OC\Files\Filesystem::getOwner($filePath);
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// Decrypt keyfile
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$plainKeyfile = $this->decryptUnknownKeyfile($filePath, $fileOwner, $privateKey);
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$plainKeyfile = $this->decryptKeyfile($filePath, $privateKey);
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// Re-enc keyfile to (additional) sharekeys
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$multiEncKey = Crypt::multiKeyEncrypt($plainKeyfile, $userPubKeys);
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@ -115,130 +115,6 @@ class Test_Encryption_Crypt extends \PHPUnit_Framework_TestCase {
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}
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/**
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* @large
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* @return String
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*/
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function testGenerateIv() {
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$iv = Encryption\Crypt::generateIv();
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$this->assertEquals(16, strlen($iv));
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return $iv;
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}
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/**
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* @large
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* @depends testGenerateIv
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*/
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function testConcatIv($iv) {
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$catFile = Encryption\Crypt::concatIv($this->dataLong, $iv);
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// Fetch encryption metadata from end of file
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$meta = substr($catFile, -22);
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$identifier = substr($meta, 0, 6);
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// Fetch IV from end of file
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$foundIv = substr($meta, 6);
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$this->assertEquals('00iv00', $identifier);
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$this->assertEquals($iv, $foundIv);
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// Remove IV and IV identifier text to expose encrypted content
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$data = substr($catFile, 0, -22);
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$this->assertEquals($this->dataLong, $data);
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return array(
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'iv' => $iv
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,
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'catfile' => $catFile
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);
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}
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/**
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* @medium
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* @depends testConcatIv
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*/
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function testSplitIv($testConcatIv) {
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// Split catfile into components
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$splitCatfile = Encryption\Crypt::splitIv($testConcatIv['catfile']);
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// Check that original IV and split IV match
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$this->assertEquals($testConcatIv['iv'], $splitCatfile['iv']);
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// Check that original data and split data match
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$this->assertEquals($this->dataLong, $splitCatfile['encrypted']);
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}
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/**
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* @medium
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* @return string padded
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*/
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function testAddPadding() {
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$padded = Encryption\Crypt::addPadding($this->dataLong);
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$padding = substr($padded, -2);
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$this->assertEquals('xx', $padding);
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return $padded;
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}
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/**
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* @medium
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* @depends testAddPadding
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*/
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function testRemovePadding($padded) {
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$noPadding = Encryption\Crypt::RemovePadding($padded);
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$this->assertEquals($this->dataLong, $noPadding);
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}
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/**
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* @medium
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*/
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function testEncrypt() {
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$random = openssl_random_pseudo_bytes(13);
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$iv = substr(base64_encode($random), 0, -4); // i.e. E5IG033j+mRNKrht
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$crypted = Encryption\Crypt::encrypt($this->dataUrl, $iv, 'hat');
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$this->assertNotEquals($this->dataUrl, $crypted);
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}
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/**
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* @medium
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*/
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function testDecrypt() {
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$random = openssl_random_pseudo_bytes(13);
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$iv = substr(base64_encode($random), 0, -4); // i.e. E5IG033j+mRNKrht
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$crypted = Encryption\Crypt::encrypt($this->dataUrl, $iv, 'hat');
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$decrypt = Encryption\Crypt::decrypt($crypted, $iv, 'hat');
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$this->assertEquals($this->dataUrl, $decrypt);
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}
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function testDecryptPrivateKey() {
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// test successful decrypt
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@ -364,14 +240,12 @@ class Test_Encryption_Crypt extends \PHPUnit_Framework_TestCase {
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//print_r($r);
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// Join IVs and their respective data chunks
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$e = array(
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$r[0] . $r[1],
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$r[2] . $r[3],
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$r[4] . $r[5],
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$r[6] . $r[7],
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$r[8] . $r[9],
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$r[10] . $r[11]
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); //.$r[11], $r[12].$r[13], $r[14] );
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$e = array();
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$i = 0;
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while ($i < count($r)-1) {
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$e[] = $r[$i] . $r[$i+1];
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$i = $i + 2;
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}
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//print_r($e);
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@ -466,24 +340,6 @@ class Test_Encryption_Crypt extends \PHPUnit_Framework_TestCase {
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$this->view->unlink($this->userId . '/files/' . $filename);
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}
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/**
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* @medium
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*/
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function testSymmetricEncryptFileContentKeyfile() {
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# TODO: search in keyfile for actual content as IV will ensure this test always passes
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$crypted = Encryption\Crypt::symmetricEncryptFileContentKeyfile($this->dataUrl);
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$this->assertNotEquals($this->dataUrl, $crypted['encrypted']);
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|
||||
$decrypt = Encryption\Crypt::symmetricDecryptFileContent($crypted['encrypted'], $crypted['key']);
|
||||
|
||||
$this->assertEquals($this->dataUrl, $decrypt);
|
||||
|
||||
}
|
||||
|
||||
/**
|
||||
* @medium
|
||||
*/
|
||||
|
|
@ -526,49 +382,13 @@ class Test_Encryption_Crypt extends \PHPUnit_Framework_TestCase {
|
|||
|
||||
}
|
||||
|
||||
/**
|
||||
* @medium
|
||||
*/
|
||||
function testKeyEncrypt() {
|
||||
|
||||
// Generate keypair
|
||||
$pair1 = Encryption\Crypt::createKeypair();
|
||||
|
||||
// Encrypt data
|
||||
$crypted = Encryption\Crypt::keyEncrypt($this->dataUrl, $pair1['publicKey']);
|
||||
|
||||
$this->assertNotEquals($this->dataUrl, $crypted);
|
||||
|
||||
// Decrypt data
|
||||
$decrypt = Encryption\Crypt::keyDecrypt($crypted, $pair1['privateKey']);
|
||||
|
||||
$this->assertEquals($this->dataUrl, $decrypt);
|
||||
|
||||
}
|
||||
|
||||
/**
|
||||
* @medium
|
||||
* @brief test encryption using legacy blowfish method
|
||||
*/
|
||||
function testLegacyEncryptShort() {
|
||||
|
||||
$crypted = Encryption\Crypt::legacyEncrypt($this->dataShort, $this->pass);
|
||||
|
||||
$this->assertNotEquals($this->dataShort, $crypted);
|
||||
|
||||
# TODO: search inencrypted text for actual content to ensure it
|
||||
# genuine transformation
|
||||
|
||||
return $crypted;
|
||||
|
||||
}
|
||||
|
||||
/**
|
||||
* @medium
|
||||
* @brief test decryption using legacy blowfish method
|
||||
* @depends testLegacyEncryptShort
|
||||
*/
|
||||
function testLegacyDecryptShort($crypted) {
|
||||
function testLegacyDecryptShort() {
|
||||
|
||||
$crypted = $this->legacyEncrypt($this->dataShort, $this->pass);
|
||||
|
||||
$decrypted = Encryption\Crypt::legacyBlockDecrypt($crypted, $this->pass);
|
||||
|
||||
|
|
@ -576,55 +396,17 @@ class Test_Encryption_Crypt extends \PHPUnit_Framework_TestCase {
|
|||
|
||||
}
|
||||
|
||||
/**
|
||||
* @medium
|
||||
* @brief test encryption using legacy blowfish method
|
||||
*/
|
||||
function testLegacyEncryptLong() {
|
||||
|
||||
$crypted = Encryption\Crypt::legacyEncrypt($this->dataLong, $this->pass);
|
||||
|
||||
$this->assertNotEquals($this->dataLong, $crypted);
|
||||
|
||||
# TODO: search inencrypted text for actual content to ensure it
|
||||
# genuine transformation
|
||||
|
||||
return $crypted;
|
||||
|
||||
}
|
||||
|
||||
/**
|
||||
* @medium
|
||||
* @brief test decryption using legacy blowfish method
|
||||
* @depends testLegacyEncryptLong
|
||||
*/
|
||||
function testLegacyDecryptLong($crypted) {
|
||||
function testLegacyDecryptLong() {
|
||||
|
||||
$crypted = $this->legacyEncrypt($this->dataLong, $this->pass);
|
||||
|
||||
$decrypted = Encryption\Crypt::legacyBlockDecrypt($crypted, $this->pass);
|
||||
|
||||
$this->assertEquals($this->dataLong, $decrypted);
|
||||
|
||||
$this->assertFalse(Encryption\Crypt::getBlowfish(''));
|
||||
}
|
||||
|
||||
/**
|
||||
* @medium
|
||||
* @brief test generation of legacy encryption key
|
||||
* @depends testLegacyDecryptShort
|
||||
*/
|
||||
function testLegacyCreateKey() {
|
||||
|
||||
// Create encrypted key
|
||||
$encKey = Encryption\Crypt::legacyCreateKey($this->pass);
|
||||
|
||||
// Decrypt key
|
||||
$key = Encryption\Crypt::legacyBlockDecrypt($encKey, $this->pass);
|
||||
|
||||
$this->assertTrue(is_numeric($key));
|
||||
|
||||
// Check that key is correct length
|
||||
$this->assertEquals(20, strlen($key));
|
||||
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
@ -871,4 +653,20 @@ class Test_Encryption_Crypt extends \PHPUnit_Framework_TestCase {
|
|||
// tear down
|
||||
$view->unlink($filename);
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* @brief encryption using legacy blowfish method
|
||||
* @param $data string data to encrypt
|
||||
* @param $passwd string password
|
||||
* @return string
|
||||
*/
|
||||
function legacyEncrypt($data, $passwd) {
|
||||
|
||||
$bf = new \Crypt_Blowfish($passwd);
|
||||
$crypted = $bf->encrypt($data);
|
||||
|
||||
return $crypted;
|
||||
}
|
||||
|
||||
}
|
||||
|
|
|
|||
|
|
@ -141,10 +141,7 @@ class Test_Encryption_Keymanager extends \PHPUnit_Framework_TestCase {
|
|||
*/
|
||||
function testSetFileKey() {
|
||||
|
||||
# NOTE: This cannot be tested until we are able to break out
|
||||
# of the FileSystemView data directory root
|
||||
|
||||
$key = Encryption\Crypt::symmetricEncryptFileContentKeyfile($this->randomKey, 'hat');
|
||||
$key = $this->randomKey;
|
||||
|
||||
$file = 'unittest-' . time() . '.txt';
|
||||
|
||||
|
|
@ -152,24 +149,17 @@ class Test_Encryption_Keymanager extends \PHPUnit_Framework_TestCase {
|
|||
$proxyStatus = \OC_FileProxy::$enabled;
|
||||
\OC_FileProxy::$enabled = false;
|
||||
|
||||
$this->view->file_put_contents($this->userId . '/files/' . $file, $key['encrypted']);
|
||||
$this->view->file_put_contents($this->userId . '/files/' . $file, $this->dataShort);
|
||||
|
||||
// Re-enable proxy - our work is done
|
||||
\OC_FileProxy::$enabled = $proxyStatus;
|
||||
Encryption\Keymanager::setFileKey($this->view, $file, $this->userId, $key);
|
||||
|
||||
//$view = new \OC_FilesystemView( '/' . $this->userId . '/files_encryption/keyfiles' );
|
||||
Encryption\Keymanager::setFileKey($this->view, $file, $this->userId, $key['key']);
|
||||
|
||||
// enable encryption proxy
|
||||
$proxyStatus = \OC_FileProxy::$enabled;
|
||||
\OC_FileProxy::$enabled = true;
|
||||
$this->assertTrue($this->view->file_exists('/' . $this->userId . '/files_encryption/keyfiles/' . $file . '.key'));
|
||||
|
||||
// cleanup
|
||||
$this->view->unlink('/' . $this->userId . '/files/' . $file);
|
||||
|
||||
// change encryption proxy to previous state
|
||||
\OC_FileProxy::$enabled = $proxyStatus;
|
||||
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
|
|||
Loading…
Reference in New Issue