Crypt site credential password

[github/wallabag/wallabag.git] / src / Wallabag / CoreBundle / Helper / CryptoProxy.php

diff --git a/src/Wallabag/CoreBundle/Helper/CryptoProxy.php b/src/Wallabag/CoreBundle/Helper/CryptoProxy.php
new file mode 100644 (file)
index 0000000..d0a9b85
--- /dev/null
+++ b/src/Wallabag/CoreBundle/Helper/CryptoProxy.php
@@ -0,0 +1,86 @@
+<?php
+
+namespace Wallabag\CoreBundle\Helper;
+
+use Psr\Log\LoggerInterface;
+use Defuse\Crypto\Key;
+use Defuse\Crypto\Crypto;
+use Defuse\Crypto\Exception\WrongKeyOrModifiedCiphertextException;
+
+/**
+ * This is a proxy to crypt and decrypt password used by SiteCredential entity.
+ * BTW, It might be re-use for sth else.
+ */
+class CryptoProxy
+{
+    private $logger;
+    private $encryptionKey;
+
+    public function __construct($encryptionKeyPath, LoggerInterface $logger)
+    {
+        $this->logger = $logger;
+
+        if (!file_exists($encryptionKeyPath)) {
+            $key = Key::createNewRandomKey();
+
+            file_put_contents($encryptionKeyPath, $key->saveToAsciiSafeString());
+            chmod($encryptionKeyPath, 0600);
+        }
+
+        $this->encryptionKey = file_get_contents($encryptionKeyPath);
+    }
+
+    /**
+     * Ensure the given value will be crypted.
+     *
+     * @param string $secretValue Secret valye to crypt
+     *
+     * @return string
+     */
+    public function crypt($secretValue)
+    {
+        $this->logger->debug('Crypto: crypting value: '.$this->mask($secretValue));
+
+        return Crypto::encrypt($secretValue, $this->loadKey());
+    }
+
+    /**
+     * Ensure the given crypted value will be decrypted.
+     *
+     * @param string $cryptedValue The value to be decrypted
+     *
+     * @return string
+     */
+    public function decrypt($cryptedValue)
+    {
+        $this->logger->debug('Crypto: decrypting value: '.$this->mask($cryptedValue));
+
+        try {
+            return Crypto::decrypt($cryptedValue, $this->loadKey());
+        } catch (WrongKeyOrModifiedCiphertextException $e) {
+            throw new \RuntimeException('Decrypt fail: '.$e->getMessage());
+        }
+    }
+
+    /**
+     * Load the private key.
+     *
+     * @return string
+     */
+    private function loadKey()
+    {
+        return Key::loadFromAsciiSafeString($this->encryptionKey);
+    }
+
+    /**
+     * Keep first and last character and put some stars in between.
+     *
+     * @param string $value Value to mask
+     *
+     * @return string
+     */
+    private function mask($value)
+    {
+        return $value[0].'*****'.$value[strlen($value) - 1];
+    }
+}