diff --git a/lib/HashAlgorithm/Base/Base64.php b/lib/HashAlgorithm/Base/Base64.php
new file mode 100644
index 0000000..ca9fb05
--- /dev/null
+++ b/lib/HashAlgorithm/Base/Base64.php
@@ -0,0 +1,41 @@
+<?php
+/**
+ * Nextcloud - user_sql
+ * Copyright (C) 2012-2018 Andreas Böhler <dev (at) aboehler (dot) at>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace OCA\user_sql\HashAlgorithm\Base;
+
+/**
+ * Base64 utilities trait.
+ * @author Marcin Łojewski <dev@mlojewski.me>
+ */
+trait Base64
+{
+    /**
+     * Convert hexadecimal message to its base64 form.
+     * @param $hex string Hexadecimal encoded message.
+     * @return string Same message encoded in base64.
+     */
+    private static function hexToBase64($hex)
+    {
+        $hexChr = '';
+        foreach (str_split($hex, 2) as $hexPair) {
+            $hexChr .= chr(hexdec($hexPair));
+        }
+        return base64_encode($hexChr);
+    }
+}
diff --git a/lib/HashAlgorithm/Singleton.php b/lib/HashAlgorithm/Base/Singleton.php
similarity index 96%
rename from lib/HashAlgorithm/Singleton.php
rename to lib/HashAlgorithm/Base/Singleton.php
index b54c550..39dadc4 100644
--- a/lib/HashAlgorithm/Singleton.php
+++ b/lib/HashAlgorithm/Base/Singleton.php
@@ -17,7 +17,7 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-namespace OCA\user_sql\HashAlgorithm;
+namespace OCA\user_sql\HashAlgorithm\Base;
 
 /**
  * Singleton pattern trait.
diff --git a/lib/HashAlgorithm/Cleartext.php b/lib/HashAlgorithm/Cleartext.php
index 179d1ba..428ea83 100644
--- a/lib/HashAlgorithm/Cleartext.php
+++ b/lib/HashAlgorithm/Cleartext.php
@@ -19,6 +19,8 @@
 
 namespace OCA\user_sql\HashAlgorithm;
 
+use OCA\user_sql\HashAlgorithm\Base\Singleton;
+
 /**
  * Cleartext password hash implementation.
  * @author Marcin Łojewski <dev@mlojewski.me>
diff --git a/lib/HashAlgorithm/CourierMD5.php b/lib/HashAlgorithm/CourierMD5.php
new file mode 100644
index 0000000..42d6e7b
--- /dev/null
+++ b/lib/HashAlgorithm/CourierMD5.php
@@ -0,0 +1,57 @@
+<?php
+/**
+ * Nextcloud - user_sql
+ * Copyright (C) 2012-2018 Andreas Böhler <dev (at) aboehler (dot) at>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace OCA\user_sql\HashAlgorithm;
+
+use OCA\user_sql\HashAlgorithm\Base\Base64;
+use OCA\user_sql\HashAlgorithm\Base\Singleton;
+
+/**
+ * Courier MD5 password hash implementation.
+ * @author Marcin Łojewski <dev@mlojewski.me>
+ */
+class CourierMD5 implements HashAlgorithm
+{
+    use Base64;
+    use Singleton;
+
+    /**
+     * @inheritdoc
+     */
+    public function getVisibleName()
+    {
+        return "Courier base64-encoded MD5";
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function checkPassword($password, $dbHash)
+    {
+        return $this->getPasswordHash($password) === $dbHash;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function getPasswordHash($password)
+    {
+        return '{MD5}' . self::hexToBase64(md5($password));
+    }
+}
diff --git a/lib/HashAlgorithm/CourierMD5Raw.php b/lib/HashAlgorithm/CourierMD5Raw.php
new file mode 100644
index 0000000..3d31819
--- /dev/null
+++ b/lib/HashAlgorithm/CourierMD5Raw.php
@@ -0,0 +1,55 @@
+<?php
+/**
+ * Nextcloud - user_sql
+ * Copyright (C) 2012-2018 Andreas Böhler <dev (at) aboehler (dot) at>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace OCA\user_sql\HashAlgorithm;
+
+use OCA\user_sql\HashAlgorithm\Base\Singleton;
+
+/**
+ * Courier MD5 RAW password hash implementation.
+ * @author Marcin Łojewski <dev@mlojewski.me>
+ */
+class CourierMD5Raw implements HashAlgorithm
+{
+    use Singleton;
+
+    /**
+     * @inheritdoc
+     */
+    public function getVisibleName()
+    {
+        return "Courier hexadecimal MD5";
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function checkPassword($password, $dbHash)
+    {
+        return $this->getPasswordHash($password) === $dbHash;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function getPasswordHash($password)
+    {
+        return '{MD5RAW}' . md5($password);
+    }
+}
diff --git a/lib/HashAlgorithm/CourierSHA1.php b/lib/HashAlgorithm/CourierSHA1.php
new file mode 100644
index 0000000..2553c61
--- /dev/null
+++ b/lib/HashAlgorithm/CourierSHA1.php
@@ -0,0 +1,57 @@
+<?php
+/**
+ * Nextcloud - user_sql
+ * Copyright (C) 2012-2018 Andreas Böhler <dev (at) aboehler (dot) at>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace OCA\user_sql\HashAlgorithm;
+
+use OCA\user_sql\HashAlgorithm\Base\Base64;
+use OCA\user_sql\HashAlgorithm\Base\Singleton;
+
+/**
+ * Courier SHA1 password hash implementation.
+ * @author Marcin Łojewski <dev@mlojewski.me>
+ */
+class CourierSHA1 implements HashAlgorithm
+{
+    use Base64;
+    use Singleton;
+
+    /**
+     * @inheritdoc
+     */
+    public function getVisibleName()
+    {
+        return "Courier base64-encoded SHA1";
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function checkPassword($password, $dbHash)
+    {
+        return $this->getPasswordHash($password) === $dbHash;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function getPasswordHash($password)
+    {
+        return '{SHA}' . self::hexToBase64(sha1($password));
+    }
+}
diff --git a/lib/HashAlgorithm/CourierSHA256.php b/lib/HashAlgorithm/CourierSHA256.php
new file mode 100644
index 0000000..c7e4c94
--- /dev/null
+++ b/lib/HashAlgorithm/CourierSHA256.php
@@ -0,0 +1,57 @@
+<?php
+/**
+ * Nextcloud - user_sql
+ * Copyright (C) 2012-2018 Andreas Böhler <dev (at) aboehler (dot) at>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace OCA\user_sql\HashAlgorithm;
+
+use OCA\user_sql\HashAlgorithm\Base\Base64;
+use OCA\user_sql\HashAlgorithm\Base\Singleton;
+
+/**
+ * Courier SHA256 password hash implementation.
+ * @author Marcin Łojewski <dev@mlojewski.me>
+ */
+class CourierSHA256 implements HashAlgorithm
+{
+    use Base64;
+    use Singleton;
+
+    /**
+     * @inheritdoc
+     */
+    public function getVisibleName()
+    {
+        return "Courier base64-encoded SHA256";
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function checkPassword($password, $dbHash)
+    {
+        return $this->getPasswordHash($password) === $dbHash;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function getPasswordHash($password)
+    {
+        return '{SHA256}' . self::hexToBase64(hash('sha256', $password));
+    }
+}
diff --git a/lib/HashAlgorithm/MD5.php b/lib/HashAlgorithm/MD5.php
index acf3370..f87db67 100644
--- a/lib/HashAlgorithm/MD5.php
+++ b/lib/HashAlgorithm/MD5.php
@@ -19,6 +19,8 @@
 
 namespace OCA\user_sql\HashAlgorithm;
 
+use OCA\user_sql\HashAlgorithm\Base\Singleton;
+
 /**
  * MD5 password hash implementation.
  * @author Marcin Łojewski <dev@mlojewski.me>
@@ -38,16 +40,16 @@ class MD5 implements HashAlgorithm
     /**
      * @inheritdoc
      */
-    public function getPasswordHash($password)
+    public function checkPassword($password, $dbHash)
     {
-        return md5($password);
+        return $this->getPasswordHash($password) === $dbHash;
     }
 
     /**
      * @inheritdoc
      */
-    public function checkPassword($password, $dbHash)
+    public function getPasswordHash($password)
     {
-        return md5($password) === $dbHash;
+        return md5($password);
     }
 }
diff --git a/lib/HashAlgorithm/SHA1.php b/lib/HashAlgorithm/SHA1.php
index e9f7a1e..086a527 100644
--- a/lib/HashAlgorithm/SHA1.php
+++ b/lib/HashAlgorithm/SHA1.php
@@ -19,6 +19,8 @@
 
 namespace OCA\user_sql\HashAlgorithm;
 
+use OCA\user_sql\HashAlgorithm\Base\Singleton;
+
 /**
  * SHA1 password hash implementation.
  * @author Marcin Łojewski <dev@mlojewski.me>
@@ -38,16 +40,16 @@ class SHA1 implements HashAlgorithm
     /**
      * @inheritdoc
      */
-    public function getPasswordHash($password)
+    public function checkPassword($password, $dbHash)
     {
-        return sha1($password);
+        return $this->getPasswordHash($password) === $dbHash;
     }
 
     /**
      * @inheritdoc
      */
-    public function checkPassword($password, $dbHash)
+    public function getPasswordHash($password)
     {
-        return sha1($password) === $dbHash;
+        return sha1($password);
     }
 }