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#!/usr/bin/env python
#
# Electrum - lightweight Bitcoin client
# Copyright (C) 2014 Thomas Voegtlin
#
# 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/>.
import os
import hmac
import math
import hashlib
import unicodedata
import string
import ecdsa
import pbkdf2
from util import print_error
from bitcoin import is_old_seed, is_new_seed
import version
import i18n
# http://www.asahi-net.or.jp/~ax2s-kmtn/ref/unicode/e_asia.html
CJK_INTERVALS = [
(0x4E00, 0x9FFF, 'CJK Unified Ideographs'),
(0x3400, 0x4DBF, 'CJK Unified Ideographs Extension A'),
(0x20000, 0x2A6DF, 'CJK Unified Ideographs Extension B'),
(0x2A700, 0x2B73F, 'CJK Unified Ideographs Extension C'),
(0x2B740, 0x2B81F, 'CJK Unified Ideographs Extension D'),
(0xF900, 0xFAFF, 'CJK Compatibility Ideographs'),
(0x2F800, 0x2FA1D, 'CJK Compatibility Ideographs Supplement'),
(0x3190, 0x319F , 'Kanbun'),
(0x2E80, 0x2EFF, 'CJK Radicals Supplement'),
(0x2F00, 0x2FDF, 'CJK Radicals'),
(0x31C0, 0x31EF, 'CJK Strokes'),
(0x2FF0, 0x2FFF, 'Ideographic Description Characters'),
(0xE0100, 0xE01EF, 'Variation Selectors Supplement'),
(0x3100, 0x312F, 'Bopomofo'),
(0x31A0, 0x31BF, 'Bopomofo Extended'),
(0xFF00, 0xFFEF, 'Halfwidth and Fullwidth Forms'),
(0x3040, 0x309F, 'Hiragana'),
(0x30A0, 0x30FF, 'Katakana'),
(0x31F0, 0x31FF, 'Katakana Phonetic Extensions'),
(0x1B000, 0x1B0FF, 'Kana Supplement'),
(0xAC00, 0xD7AF, 'Hangul Syllables'),
(0x1100, 0x11FF, 'Hangul Jamo'),
(0xA960, 0xA97F, 'Hangul Jamo Extended A'),
(0xD7B0, 0xD7FF, 'Hangul Jamo Extended B'),
(0x3130, 0x318F, 'Hangul Compatibility Jamo'),
(0xA4D0, 0xA4FF, 'Lisu'),
(0x16F00, 0x16F9F, 'Miao'),
(0xA000, 0xA48F, 'Yi Syllables'),
(0xA490, 0xA4CF, 'Yi Radicals'),
]
def is_CJK(c):
n = ord(c)
for imin,imax,name in CJK_INTERVALS:
if n>=imin and n<=imax: return True
return False
def prepare_seed(seed):
# normalize
seed = unicodedata.normalize('NFKD', unicode(seed))
# lower
seed = seed.lower()
# remove accents
seed = u''.join([c for c in seed if not unicodedata.combining(c)])
# normalize whitespaces
seed = u' '.join(seed.split())
# remove whitespaces between CJK
seed = u''.join([seed[i] for i in range(len(seed)) if not (seed[i] in string.whitespace and is_CJK(seed[i-1]) and is_CJK(seed[i+1]))])
return seed
filenames = {
'en':'english.txt',
'es':'spanish.txt',
'ja':'japanese.txt',
'pt':'portuguese.txt',
'zh':'chinese_simplified.txt'
}
class Mnemonic(object):
# Seed derivation no longer follows BIP39
# Mnemonic phrase uses a hash based checksum, instead of a wordlist-dependent checksum
def __init__(self, lang=None):
if lang in [None, '']:
lang = i18n.language.info().get('language', 'en')
print_error('language', lang)
filename = filenames.get(lang[0:2], 'english.txt')
path = os.path.join(os.path.dirname(__file__), 'wordlist', filename)
s = open(path,'r').read().strip()
s = unicodedata.normalize('NFKD', s.decode('utf8'))
lines = s.split('\n')
self.wordlist = []
for line in lines:
line = line.split('#')[0]
line = line.strip(' \r')
assert ' ' not in line
if line:
self.wordlist.append(line)
print_error("wordlist has %d words"%len(self.wordlist))
@classmethod
def mnemonic_to_seed(self, mnemonic, passphrase):
PBKDF2_ROUNDS = 2048
mnemonic = prepare_seed(mnemonic)
return pbkdf2.PBKDF2(mnemonic, 'electrum' + passphrase, iterations = PBKDF2_ROUNDS, macmodule = hmac, digestmodule = hashlib.sha512).read(64)
def mnemonic_encode(self, i):
n = len(self.wordlist)
words = []
while i:
x = i%n
i = i/n
words.append(self.wordlist[x])
return ' '.join(words)
def mnemonic_decode(self, seed):
n = len(self.wordlist)
words = seed.split()
i = 0
while words:
w = words.pop()
k = self.wordlist.index(w)
i = i*n + k
return i
def check_seed(self, seed, custom_entropy):
assert is_new_seed(seed)
i = self.mnemonic_decode(seed)
return i % custom_entropy == 0
def make_seed(self, num_bits=128, prefix=version.SEED_PREFIX, custom_entropy=1):
n = int(math.ceil(math.log(custom_entropy,2)))
# bits of entropy used by the prefix
k = len(prefix)*4
# we add at least 16 bits
n_added = max(16, k + num_bits - n)
print_error("make_seed", prefix, "adding %d bits"%n_added)
my_entropy = ecdsa.util.randrange( pow(2, n_added) )
nonce = 0
while True:
nonce += 1
i = custom_entropy * (my_entropy + nonce)
seed = self.mnemonic_encode(i)
assert i == self.mnemonic_decode(seed)
if is_old_seed(seed):
continue
if is_new_seed(seed, prefix):
break
print_error('%d words'%len(seed.split()))
return seed