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core: Find Python-bundled libcrypto on Windows #319

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21 changes: 20 additions & 1 deletion bitcoin/core/key.py
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Original file line number Diff line number Diff line change
Expand Up @@ -18,15 +18,34 @@
import ctypes
import ctypes.util
import hashlib
import os
import sys
from os import urandom
import bitcoin
import bitcoin.signature

import bitcoin.core.script


def _find_bundled_libcrypto():
# On Python 3.8+ Windows, sys.{base_,}prefix/DLLs is no longer on the DLL
# search path, so find_library can't see the libcrypto-*.dll Python ships.
if sys.platform != 'win32':
return None
for base in (sys.base_prefix, sys.prefix):
d = os.path.join(base, 'DLLs')
if not os.path.isdir(d):
continue
for name in os.listdir(d):
low = name.lower()
if low.startswith('libcrypto-') and low.endswith('.dll'):
return os.path.join(d, name)
return None


_ssl = ctypes.cdll.LoadLibrary(
ctypes.util.find_library('ssl.35') or ctypes.util.find_library('ssl') or ctypes.util.find_library('libeay32')
or ctypes.util.find_library('libcrypto')
or ctypes.util.find_library('libcrypto') or _find_bundled_libcrypto()
)

_libsecp256k1_path = ctypes.util.find_library('secp256k1')
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