def test_fix_seed():
old_val = os.environ.get('PYTHONHASHSEED', None)
try:
os.environ['PYTHONHASHSEED'] = '0'
initialize_from_env()
assert siphash24("foo") == 15988776847138518036
# value checked with CPython 3.5 (turned positive by adding 2**64)
os.environ['PYTHONHASHSEED'] = '4000000000'
initialize_from_env()
assert siphash24("foo") == 13829150778707464258
# value checked with CPython 3.5 (turned positive by adding 2**64)
for env in ['', 'random']:
os.environ['PYTHONHASHSEED'] = env
initialize_from_env()
hash1 = siphash24("foo")
initialize_from_env()
hash2 = siphash24("foo")
assert hash1 != hash2 # extremely unlikely
finally:
if old_val is None:
del os.environ['PYTHONHASHSEED']
else:
os.environ['PYTHONHASHSEED'] = old_val
def check(s):
q = rffi.str2charp('?' + s)
with choosen_seed(0x8a9f065a358479f4, 0x11cb1e9ee7f40e1f,
test_misaligned_path=True):
x = siphash24(s)
y = _siphash24(llmemory.cast_ptr_to_adr(rffi.ptradd(q, 1)), len(s))
rffi.free_charp(q)
assert x == y
return x