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⚡️ Speed up function derive_keys by 19% #64

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⚡️ Speed up function derive_keys by 19% #64

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10 changes: 7 additions & 3 deletions electrum/crypto.py
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Original file line number Diff line number Diff line change
Expand Up @@ -327,9 +327,13 @@ def sha256(x: Union[bytes, str]) -> bytes:


def sha256d(x: Union[bytes, str]) -> bytes:
x = to_bytes(x, 'utf8')
out = bytes(sha256(sha256(x)))
return out
# Avoid redundant conversion; only convert to bytes if necessary
if not isinstance(x, bytes):
x = to_bytes(x, 'utf8')
# Avoid double-conversion and extra function calls
h1 = hashlib.sha256(x).digest()
h2 = hashlib.sha256(h1).digest()
return h2


def hash_160(x: bytes) -> bytes:
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