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+# QBlowfish
+
+QBlowfish is a [Qt](http://qt.nokia.com/) implementation of the [Blowfish](http://www.schneier.com/blowfish.html) encryption algorithm, as described in the original Blowfish [paper](http://www.schneier.com/paper-blowfish-fse.html) by Bruce Schneier.
+
+The Blowfish algorithm requires the input in 8-byte blocks. To simplify usage, QBlowfish can optionally add [PKCS5 padding](http://tools.ietf.org/html/rfc5652#section-6.3) to the input data. (For example, if the input is only 60 bytes long, 4 bytes will be padded to bring the bytecount to a multiple of 8.) When padding is enabled during decryption, QBlowfish will also remove the padded bytes from the output.
+
+You only need to add 3 files (src/*) to your project. You can then use the QBlowfish class to encrypt and decrypt stuff.
+
+    QByteArray secretKey("This is a secret")
+    QString clearText("Stuff to encrypt");
+
+    QBlowfish bf(secretKey);
+    bf.setPaddingEnabled(true);
+    QByteArray encryptedBa = bf.encrypted(clearText.toUtf8());
+
+A more detailed example is included in the repo.
+
+QBlowfish is not optimized for speed. It processes the data in bytes (most other Blowfish implementations seem to work on 4-byte words) and is endianness-agnostic.
+
+### Tests
+
+Unit tests are written using QTestLib. Tests include [the official test vectors](http://www.schneier.com/code/vectors.txt).
+
+QBlowfish has been tested with Qt 4.8 on Windows and Linux.
+
+### License
+
+QBlowfish is published under the MIT license.