Issue #27706: Fix regression in random.seed(somestr, version=1)
diff --git a/Lib/random.py b/Lib/random.py
index 5950735..06513c8 100644
--- a/Lib/random.py
+++ b/Lib/random.py
@@ -112,6 +112,13 @@
import time
a = int(time.time() * 256) # use fractional seconds
+ if version == 1 and isinstance(a, (str, bytes)):
+ x = ord(a[0]) << 7 if a else 0
+ for c in a:
+ x = ((1000003 * x) ^ ord(c)) & 0xFFFFFFFFFFFFFFFF
+ x ^= len(a)
+ a = -2 if x == -1 else x
+
if version == 2:
if isinstance(a, (str, bytes, bytearray)):
if isinstance(a, str):
diff --git a/Lib/test/test_random.py b/Lib/test/test_random.py
index 5393431..e80ed17 100644
--- a/Lib/test/test_random.py
+++ b/Lib/test/test_random.py
@@ -326,6 +326,24 @@
['0x1.1239ddfb11b7cp-3', '0x1.b3cbb5c51b120p-4',
'0x1.8c4f55116b60fp-1', '0x1.63eb525174a27p-1'])
+ def test_bug_27706(self):
+ # Verify that version 1 seeds are unaffected by hash randomization
+
+ self.gen.seed('nofar', version=1) # hash('nofar') == 5990528763808513177
+ self.assertEqual([self.gen.random().hex() for i in range(4)],
+ ['0x1.8645314505ad7p-1', '0x1.afb1f82e40a40p-5',
+ '0x1.2a59d2285e971p-1', '0x1.56977142a7880p-6'])
+
+ self.gen.seed('rachel', version=1) # hash('rachel') == -9091735575445484789
+ self.assertEqual([self.gen.random().hex() for i in range(4)],
+ ['0x1.0b294cc856fcdp-1', '0x1.2ad22d79e77b8p-3',
+ '0x1.3052b9c072678p-2', '0x1.578f332106574p-3'])
+
+ self.gen.seed('', version=1) # hash('') == 0
+ self.assertEqual([self.gen.random().hex() for i in range(4)],
+ ['0x1.b0580f98a7dbep-1', '0x1.84129978f9c1ap-1',
+ '0x1.aeaa51052e978p-2', '0x1.092178fb945a6p-2'])
+
def test_setstate_first_arg(self):
self.assertRaises(ValueError, self.gen.setstate, (1, None, None))