# 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.