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bitcoin: trivial speedup for DecodeBase58Check (down to ~80% time)

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This commit is contained in:
SomberNight
2022-12-23 08:28:59 +00:00
parent 29a0560f98
commit 4f20e4a21f
1 changed files with 7 additions and 2 deletions
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9
electrum/bitcoin.py
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@@ -541,9 +541,11 @@ def pubkeyhash_to_p2pkh_script(pubkey_hash160: str) -> str:
__b58chars = b'123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz' __b58chars = b'123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
assert len(__b58chars) == 58 assert len(__b58chars) == 58
__b58chars_inv = inv_dict(dict(enumerate(__b58chars)))
__b43chars = b'0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ$*+-./:' __b43chars = b'0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ$*+-./:'
assert len(__b43chars) == 43 assert len(__b43chars) == 43
__b43chars_inv = inv_dict(dict(enumerate(__b43chars)))
class BaseDecodeError(BitcoinException): pass class BaseDecodeError(BitcoinException): pass
@@ -589,13 +591,16 @@ def base_decode(v: Union[bytes, str], *, base: int, length: int = None) -> Optio
if base not in (58, 43): if base not in (58, 43):
raise ValueError('not supported base: {}'.format(base)) raise ValueError('not supported base: {}'.format(base))
chars = __b58chars chars = __b58chars
chars_inv = __b58chars_inv
if base == 43: if base == 43:
chars = __b43chars chars = __b43chars
chars_inv = __b43chars_inv
long_value = 0 long_value = 0
power_of_base = 1 power_of_base = 1
for c in v[::-1]: for c in v[::-1]:
digit = chars.find(bytes([c])) try:
if digit == -1: digit = chars_inv[c]
except KeyError:
raise BaseDecodeError('Forbidden character {} for base {}'.format(c, base)) raise BaseDecodeError('Forbidden character {} for base {}'.format(c, base))
# naive but slow variant: long_value += digit * (base**i) # naive but slow variant: long_value += digit * (base**i)
long_value += digit * power_of_base long_value += digit * power_of_base