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# Copyright 2016 Lars Wirzenius
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# =*= License: GPL-3+ =*=
import pgpwordlist
_words = pgpwordlist.pgp_word_list
def _make_reverse_lookup(words):
rev = {}
for hexstr, t in words.items():
rev[t[0]] = hexstr
rev[t[1]] = hexstr
return rev
_w2hex = _make_reverse_lookup(_words)
def get_word(hexstr, offset):
hexstr = hexstr.lower()
t = _words.get(hexstr)
if t is None:
raise KeyError(hexstr)
return t[offset % 2]
def get_hex(word):
return _w2hex[word.lower()]
def hex_to_words(hexstr):
words = [get_word(h, i) for i, h in enumerate(_hex_bytes(hexstr))]
return ' '.join(words)
def _hex_bytes(hexstr):
for i in range(0, len(hexstr), 2):
yield hexstr[i:i+2]
def words_to_hex(wordstr):
return ''.join(get_hex(w) for w in wordstr.split())
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