AaronFiore/electrum
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old_mnemonic: speed up mn_decode

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mn_decode is used by mnemonic.make_seed which now takes around 25% less time
This commit is contained in:
SomberNight
2019-11-15 12:08:06 +01:00
parent bc4f22503f
commit 6ebbaa60ef
3 changed files with 10 additions and 8 deletions
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11
electrum/old_mnemonic.py
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@@ -26,7 +26,7 @@
# list of words from http://en.wiktionary.org/wiki/Wiktionary:Frequency_lists/Contemporary_poetry
words = [
words = (
"like",
"just",
"love",
@@ -1653,7 +1653,8 @@ words = [
"unseen",
"weapon",
"weary",
]
)
_words_indexes = {w: i for i, w in enumerate(words)}
n = len(words)
assert n == 1626
@@ -1679,9 +1680,9 @@ def mn_decode( wlist ):
out = ''
for i in range(len(wlist)//3):
word1, word2, word3 = wlist[3*i:3*i+3]
w1 = words.index(word1)
w2 = (words.index(word2))%n
w3 = (words.index(word3))%n
w1 = _words_indexes[word1]
w2 = (_words_indexes[word2]) % n
w3 = (_words_indexes[word3]) % n
x = w1 +n*((w2-w1)%n) +n*n*((w3-w2)%n)
out += '%08x'%x
return out