bpo-25287: Backport new tests for crypt and skip test_crypt on OpenBSD.

Lib/test/test_crypt.py

@@ -1,33 +1,45 @@
+import sys
 from test import support
 import unittest
 
 crypt = support.import_module('crypt')
 
+if sys.platform.startswith('openbsd'):
+    raise unittest.SkipTest('The only supported method on OpenBSD is Blowfish')
+
 class CryptTestCase(unittest.TestCase):
 
     def test_crypt(self):
-        c = crypt.crypt('mypassword', 'ab')
-        if support.verbose:
-            print('Test encryption: ', c)
+        cr = crypt.crypt('mypassword')
+        cr2 = crypt.crypt('mypassword', cr)
+        self.assertEqual(cr2, cr)
+        cr = crypt.crypt('mypassword', 'ab')
+        if cr is not None:
+            cr2 = crypt.crypt('mypassword', cr)
+            self.assertEqual(cr2, cr)
 
     def test_salt(self):
         self.assertEqual(len(crypt._saltchars), 64)
         for method in crypt.methods:
             salt = crypt.mksalt(method)
-            self.assertEqual(len(salt),
-                    method.salt_chars + (3 if method.ident else 0))
+            self.assertIn(len(salt) - method.salt_chars, {0, 1, 3, 4, 6, 7})
+            if method.ident:
+                self.assertIn(method.ident, salt[:len(salt)-method.salt_chars])
 
     def test_saltedcrypt(self):
         for method in crypt.methods:
-            pw = crypt.crypt('assword', method)
-            self.assertEqual(len(pw), method.total_size)
-            pw = crypt.crypt('assword', crypt.mksalt(method))
-            self.assertEqual(len(pw), method.total_size)
+            cr = crypt.crypt('assword', method)
+            self.assertEqual(len(cr), method.total_size)
+            cr2 = crypt.crypt('assword', cr)
+            self.assertEqual(cr2, cr)
+            cr = crypt.crypt('assword', crypt.mksalt(method))
+            self.assertEqual(len(cr), method.total_size)
 
     def test_methods(self):
         # Guarantee that METHOD_CRYPT is the last method in crypt.methods.
         self.assertTrue(len(crypt.methods) >= 1)
         self.assertEqual(crypt.METHOD_CRYPT, crypt.methods[-1])
 
+
 if __name__ == "__main__":
     unittest.main()