def rurandom_example():
r = rurandom.urandom(None, 100)
print r
# The call can be interrupted by a signal, you can define a callback
# function for status checking
r = rurandom.urandom(None, 100, signal_checker)
def urandom(space, n):
"""urandom(n) -> str
Return a string of n random bytes suitable for cryptographic use.
"""
context = get(space).random_context
try:
return space.wrapbytes(rurandom.urandom(context, n))
except OSError, e:
raise wrap_oserror(space, e)
def urandom(space, n):
"""urandom(n) -> str
Return a string of n random bytes suitable for cryptographic use.
"""
context = get(space).random_context
try:
return space.wrapbytes(rurandom.urandom(context, n))
except OSError, e:
raise wrap_oserror(space, e)
def urandom(space, n):
"""urandom(n) -> str
Return a string of n random bytes suitable for cryptographic use.
"""
context = get(space).random_context
signal_checker = space.getexecutioncontext().checksignals
try:
return space.wrap(rurandom.urandom(context, n, signal_checker))
except OSError as e:
raise wrap_oserror(space, e)
def urandom(space, n):
"""urandom(n) -> str
Return a string of n random bytes suitable for cryptographic use.
"""
context = get(space).random_context
try:
# urandom() takes a final argument that should be a regular function,
# not a bound method like 'getexecutioncontext().checksignals'.
# Otherwise, we can't use it from several independent places.
_sigcheck.space = space
return space.newbytes(rurandom.urandom(context, n, _signal_checker))
except OSError as e:
raise wrap_oserror(space, e)
def urandom(space, n):
"""urandom(n) -> str
Return a string of n random bytes suitable for cryptographic use.
"""
context = get(space).random_context
try:
# urandom() takes a final argument that should be a regular function,
# not a bound method like 'getexecutioncontext().checksignals'.
# Otherwise, we can't use it from several independent places.
_sigcheck.space = space
return space.newbytes(rurandom.urandom(context, n, _signal_checker))
except OSError as e:
# CPython raises NotImplementedError if /dev/urandom cannot be found.
# To maximize compatibility, we should also raise NotImplementedError
# and not OSError (although CPython also raises OSError in case it
# could open /dev/urandom but there are further problems).
raise wrap_oserror(space,
e,
w_exception_class=space.w_NotImplementedError)
def initialize_from_env():
# This uses the same algorithms as CPython 3.5. The environment
# variable we read also defaults to "PYTHONHASHSEED". If needed,
# a different RPython interpreter can patch the value of the
# global variable 'env_var_name', or just patch the whole
# initialize_from_env() function.
value = os.environ.get(env_var_name)
if value and value != "random":
with rffi.scoped_view_charp(value) as ptr:
with lltype.scoped_alloc(rffi.CCHARPP.TO, 1) as endptr:
endptr[0] = ptr
seed = strtoul(ptr, endptr, 10)
full = endptr[0][0] == '\x00'
seed = lltype.cast_primitive(lltype.Unsigned, seed)
if not full or seed > r_uint(4294967295) or (
rposix.get_saved_errno() == errno.ERANGE
and seed == lltype.cast_primitive(lltype.Unsigned,
rffi.cast(rffi.ULONG, -1))):
os.write(
2, "%s must be \"random\" or an integer "
"in range [0; 4294967295]\n" % (env_var_name, ))
os._exit(1)
if not seed:
# disable the randomized hash
s = '\x00' * 16
else:
s = lcg_urandom(seed)
else:
try:
s = rurandom.urandom(random_ctx, 16)
except Exception as e:
os.write(
2, "%s: failed to get random numbers to initialize Python\n" %
(str(e), ))
os._exit(1)
raise # makes the annotator happy
select_random_seed(s)
def test_rurandom():
context = rurandom.init_urandom()
s = rurandom.urandom(context, 5000)
assert type(s) is str and len(s) == 5000
for x in [1, 11, 111, 222]:
assert s.count(chr(x)) >= 1
def test_rurandom():
context = rurandom.init_urandom()
s = rurandom.urandom(context, 5000)
assert type(s) is str and len(s) == 5000
for x in [1, 11, 111, 222]:
assert s.count(chr(x)) >= 1
