An algorithm for authenticated encryption with associated data using Speck and HMAC-SHA256.
Spectral is algorithm for authenticated encryption with associated data; it uses Speck in CTR mode as the underlying cipher (with a 128-bit block size and a 128-bit key size) along with HMAC-SHA256 in an Encrypt-then-MAC construction.
This package provides tested, performant Python 3 CFFI bindings to an implementation of Spectral, including abstractions for simplified encryption and decryption.
You can install this package using pip or the included setup.py script:
# Using pip pip install spectral-aead # Using setup.py python setup.py install
from spectral import * # Demonstration key, nonce, plaintext and associated data key = b"\0" * spectral.KEY_SIZE nonce = b"\0" * spectral.NONCE_SIZE plaintext = b"\0" * 16 associated = b"\0" * 16 # Spectral simplified encryption encrypted = encrypt(key, plaintext, associated) # Associated data is optional # Spectral simplified decryption computed_plaintext = decrypt(key, encrypted, associated) # Raises RuntimeError if any parameter has been tampered with assert plaintext == computed_plaintext # Spectral disjoint encryption ciphertext, mac = encrypt_disjoint(key, nonce, plaintext, associated) # Associated data is optional # Spectral disjoint decryption computed_plaintext = decrypt_disjoint(key, nonce, ciphertext, mac, associated) # Raises RuntimeError if any parameter has been tampered with assert plaintext == computed_plaintext
BSD 3-Clause License Copyright (c) 2018, Phil Demetriou All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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