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bug #1177468: don't cache /dev/urandom file descriptor in os.urandom

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This commit is contained in:
Georg Brandl 2005-07-04 17:16:07 +00:00
parent 290f3829d7
commit 9e43acf2f3
2 changed files with 7 additions and 8 deletions
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12
Lib/os.py
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@ -715,22 +715,18 @@ except NameError: # statvfs_result may not exist
pass
if not _exists("urandom"):
_urandomfd = None
def urandom(n):
"""urandom(n) -> str
Return a string of n random bytes suitable for cryptographic use.
"""
global _urandomfd
if _urandomfd is None:
try:
_urandomfd = open("/dev/urandom", O_RDONLY)
except:
_urandomfd = NotImplementedError
if _urandomfd is NotImplementedError:
try:
_urandomfd = open("/dev/urandom", O_RDONLY)
except:
raise NotImplementedError("/dev/urandom (or equivalent) not found")
bytes = ""
while len(bytes) < n:
bytes += read(_urandomfd, n - len(bytes))
close(_urandomfd)
return bytes