lilliput-ae-reference-implementation

Implementations of Lilliput-AE submitted to the NIST LWC standardization process
git clone https://git.kevinlegouguec.net/lilliput-ae-reference-implementation
Log | Files | Refs | README

crypto_aead.py (957B)

      1 # Implementation of the Lilliput-AE tweakable block cipher.
      2 #
      3 # Authors, hereby denoted as "the implementer":
      4 #     Kévin Le Gouguec,
      5 #     2019.
      6 #
      7 # For more information, feedback or questions, refer to our website:
      8 # https://paclido.fr/lilliput-ae
      9 #
     10 # To the extent possible under law, the implementer has waived all copyright
     11 # and related or neighboring rights to the source code in this file.
     12 # http://creativecommons.org/publicdomain/zero/1.0/
     13 
     14 """Python port of the crypto_aead API for Lilliput-AE."""
     15 
     16 import lilliput
     17 
     18 from lilliput.constants import (
     19     NONCE_BITS,
     20     TAG_BYTES
     21 )
     22 
     23 from parameters import (
     24     KEYBYTES,                   # Expose to genkat_aead.
     25     MODE
     26 )
     27 
     28 
     29 NPUBBYTES = NONCE_BITS//8
     30 
     31 
     32 def encrypt(m, ad, npub, k):
     33     c, tag = lilliput.encrypt(m, ad, k, npub, MODE)
     34     return c+tag
     35 
     36 
     37 def decrypt(c, ad, npub, k):
     38     ctext = c[:-TAG_BYTES]
     39     tag = c[-TAG_BYTES:]
     40     return lilliput.decrypt(ctext, tag, ad, k, npub, MODE)