tallow shorter than 24 word old 2fa seeds - electrum - Electrum Bitcoin wallet
HTML git clone https://git.parazyd.org/electrum
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---
DIR commit 00b2af41c9e434ab1b862b5efc2f5f4260228c15
DIR parent 864706574bacc3f3564f30a18b178066fbfde009
HTML Author: SomberNight <somber.night@protonmail.com>
Date: Wed, 2 May 2018 14:52:32 +0200
allow shorter than 24 word old 2fa seeds
related: #3611
Diffstat:
M plugins/trustedcoin/trustedcoin.py | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
---
DIR diff --git a/plugins/trustedcoin/trustedcoin.py b/plugins/trustedcoin/trustedcoin.py
t@@ -418,7 +418,10 @@ class TrustedCoinPlugin(BasePlugin):
words = seed.split()
n = len(words)
# old version use long seed phrases
- if n >= 24:
+ if n >= 20:
+ # note: pre-2.7 2fa seeds were typically 24-25 words, however they
+ # could probabilistically be arbitrarily shorter due to a bug. (see #3611)
+ # the probability of it being < 20 words is about 2^(-(256+12-19*11)) = 2^(-59)
assert passphrase == ''
xprv1, xpub1 = self.get_xkeys(' '.join(words[0:12]), '', "m/")
xprv2, xpub2 = self.get_xkeys(' '.join(words[12:]), '', "m/")