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Fix build with PyOpenSSL > 17.2.0.
See <https://github.com/certbot/certbot/issues/5111>.
Patch copied from upstream source repository:
https://github.com/certbot/certbot/commit/f6be07da74c664b57ac8c053585f919c79f9af44
diff --git a/acme/crypto_util.py b/acme/crypto_util.py
index de15284c03..b8fba03488 100644
--- a/acme/crypto_util.py
+++ b/acme/crypto_util.py
@@ -2,6 +2,7 @@
import binascii
import contextlib
import logging
+import os
import re
import socket
import sys
@@ -243,7 +244,7 @@ def gen_ss_cert(key, domains, not_before=None,
"""
assert domains, "Must provide one or more hostnames for the cert."
cert = OpenSSL.crypto.X509()
- cert.set_serial_number(int(binascii.hexlify(OpenSSL.rand.bytes(16)), 16))
+ cert.set_serial_number(int(binascii.hexlify(os.urandom(16)), 16))
cert.set_version(2)
extensions = [
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