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# Implementation of the Lilliput-AE tweakable block cipher.
#
# Authors, hereby denoted as "the implementer":
# Kévin Le Gouguec,
# 2019.
#
# For more information, feedback or questions, refer to our website:
# https://paclido.fr/lilliput-ae
#
# To the extent possible under law, the implementer has waived all copyright
# and related or neighboring rights to the source code in this file.
# http://creativecommons.org/publicdomain/zero/1.0/
"""Python port of the crypto_aead API for Lilliput-AE."""
import lilliput
from lilliput.constants import (
NONCE_BITS,
TAG_BYTES
)
from parameters import (
KEYBYTES, # Expose to genkat_aead.
MODE
)
NPUBBYTES = NONCE_BITS//8
def encrypt(m, ad, npub, k):
c, tag = lilliput.encrypt(m, ad, k, npub, MODE)
return c+tag
def decrypt(c, ad, npub, k):
ctext = c[:-TAG_BYTES]
tag = c[-TAG_BYTES:]
return lilliput.decrypt(ctext, tag, ad, k, npub, MODE)
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