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2to3.html
63.71
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__builtin__.html
11.79
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__future__.html
15.58
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__main__.html
8.33
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_winreg.html
73.99
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abc.html
26.82
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aepack.html
15.47
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aetools.html
18.79
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aetypes.html
27.08
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aifc.html
29.59
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al.html
22.13
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allos.html
35.48
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anydbm.html
19.31
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archiving.html
10.64
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argparse.html
269.59
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array.html
35.35
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ast.html
42.42
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asynchat.html
35.84
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asyncore.html
43.22
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atexit.html
19.23
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audioop.html
41.32
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autogil.html
9.77
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base64.html
24.8
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basehttpserver.html
40.6
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bastion.html
13.02
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bdb.html
50.06
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binascii.html
26.64
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binhex.html
12.66
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bisect.html
28.52
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bsddb.html
32.02
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bz2.html
31.92
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calendar.html
50.16
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carbon.html
54.14
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cd.html
35.24
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cgi.html
58.4
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cgihttpserver.html
15.12
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cgitb.html
13.5
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chunk.html
17.41
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cmath.html
32.41
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cmd.html
32.69
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code.html
28.92
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codecs.html
125.92
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codeop.html
16.42
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collections.html
150.36
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colorpicker.html
9.02
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colorsys.html
14.38
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commands.html
16.63
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compileall.html
21.18
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compiler.html
78.14
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configparser.html
73.92
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constants.html
14.68
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contextlib.html
22.91
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cookie.html
45.38
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cookielib.html
102.78
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copy.html
14.21
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copy_reg.html
15.82
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crypt.html
11.62
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crypto.html
8.35
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csv.html
82.79
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ctypes.html
280.57
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curses.ascii.html
28.97
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curses.html
200.94
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curses.panel.html
18.43
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custominterp.html
8.59
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datatypes.html
18.84
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datetime.html
261.02
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dbhash.html
18.4
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dbm.html
14.75
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debug.html
11.28
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decimal.html
239.14
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development.html
15.27
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difflib.html
96.93
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dircache.html
13.66
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dis.html
96.52
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distribution.html
8.27
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distutils.html
10.97
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dl.html
19.27
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doctest.html
193.18
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docxmlrpcserver.html
20.02
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dumbdbm.html
16.74
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dummy_thread.html
11.04
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dummy_threading.html
9.96
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easydialogs.html
38.83
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email-examples.html
47.2
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email.charset.html
32.45
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email.encoders.html
14.09
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email.errors.html
19.2
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email.generator.html
24.78
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email.header.html
31.12
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email.html
55.3
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email.iterators.html
14.22
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email.message.html
74.91
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email.mime.html
34.51
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email.parser.html
37.09
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email.utils.html
30.04
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ensurepip.html
20.21
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errno.html
52.31
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exceptions.html
73.4
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fcntl.html
27.85
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filecmp.html
26.49
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fileformats.html
10.21
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fileinput.html
29.36
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filesys.html
11.55
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fl.html
71.58
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fm.html
15
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fnmatch.html
17.78
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formatter.html
43.91
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fpectl.html
17.84
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fpformat.html
12.65
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fractions.html
27.17
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framework.html
44.24
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frameworks.html
8.11
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ftplib.html
56.56
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functions.html
216.84
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functools.html
31.06
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future_builtins.html
15.9
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gc.html
30.74
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gdbm.html
19.35
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gensuitemodule.html
14.54
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getopt.html
26.56
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getpass.html
12.5
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gettext.html
91.32
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gl.html
26.71
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glob.html
15.42
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grp.html
12.33
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gzip.html
21.95
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hashlib.html
27.4
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heapq.html
36.72
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hmac.html
15.97
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hotshot.html
22.69
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htmllib.html
29.9
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htmlparser.html
45.11
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httplib.html
78.55
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i18n.html
10.61
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ic.html
22.03
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idle.html
45.74
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imageop.html
20.94
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imaplib.html
69.9
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imgfile.html
14.91
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imghdr.html
13.43
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imp.html
41.48
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importlib.html
10.27
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imputil.html
36.11
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index.html
82.54
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inspect.html
64.31
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internet.html
26.77
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intro.html
9.76
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io.html
122.3
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ipc.html
17.18
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itertools.html
129.91
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jpeg.html
15.36
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json.html
79.09
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keyword.html
9.27
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language.html
12.35
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linecache.html
12.7
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locale.html
68.54
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logging.config.html
82.23
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logging.handlers.html
91.96
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logging.html
123.15
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mac.html
24.49
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macos.html
18.51
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macosa.html
14.55
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macostools.html
19.67
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macpath.html
9.19
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mailbox.html
185.53
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mailcap.html
15.3
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markup.html
20.37
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marshal.html
19.88
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math.html
50.52
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md5.html
16.65
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mhlib.html
30.04
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mimetools.html
23.84
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mimetypes.html
35.82
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mimewriter.html
18.19
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mimify.html
16.96
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miniaeframe.html
14.5
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misc.html
7.77
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mm.html
10.19
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mmap.html
33.52
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modulefinder.html
19.85
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modules.html
9.68
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msilib.html
72.78
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msvcrt.html
24.1
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multifile.html
28.82
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multiprocessing.html
423.97
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mutex.html
13.56
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netdata.html
19.28
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netrc.html
15.51
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new.html
16.1
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nis.html
13.19
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nntplib.html
51.08
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numbers.html
40.91
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numeric.html
14.85
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operator.html
118.32
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optparse.html
251.08
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os.html
270.49
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os.path.html
48.87
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ossaudiodev.html
49.79
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othergui.html
9.98
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parser.html
44.52
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pdb.html
41.44
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persistence.html
16.25
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pickle.html
107.94
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pickletools.html
13.21
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pipes.html
21.85
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pkgutil.html
30.59
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platform.html
40.14
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plistlib.html
20.96
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popen2.html
30.13
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poplib.html
27.93
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posix.html
17.27
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posixfile.html
23.68
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pprint.html
36.42
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profile.html
76.65
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pty.html
11.42
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pwd.html
13.53
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py_compile.html
13.33
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pyclbr.html
18.14
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pydoc.html
14.33
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pyexpat.html
93.28
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python.html
13.53
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queue.html
29.64
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quopri.html
14.5
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random.html
47.78
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re.html
163.11
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readline.html
41.2
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repr.html
24.57
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resource.html
30.86
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restricted.html
12.69
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rexec.html
43.59
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rfc822.html
51.25
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rlcompleter.html
15.29
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robotparser.html
15.01
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runpy.html
23.55
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sched.html
21.76
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scrolledtext.html
10.67
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select.html
50.17
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sets.html
39.92
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sgi.html
11.09
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sgmllib.html
38.77
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sha.html
14.55
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shelve.html
32.93
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shlex.html
38.43
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shutil.html
49.49
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signal.html
36.52
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simplehttpserver.html
21.57
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simplexmlrpcserver.html
40.41
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site.html
29
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smtpd.html
15.64
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smtplib.html
51.86
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sndhdr.html
12.05
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socket.html
126.94
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socketserver.html
81.38
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someos.html
17.09
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spwd.html
12.25
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sqlite3.html
154.12
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ssl.html
214.5
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stat.html
41.11
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statvfs.html
13.24
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stdtypes.html
309.83
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string.html
129.58
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stringio.html
21.1
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stringprep.html
21.4
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strings.html
16.42
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struct.html
47.68
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subprocess.html
117
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sun.html
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sunau.html
35.43
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sunaudio.html
21.05
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symbol.html
9.06
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symtable.html
29.03
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sys.html
118.12
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sysconfig.html
28.8
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syslog.html
21.29
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tabnanny.html
12.78
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tarfile.html
99.54
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telnetlib.html
30.46
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tempfile.html
35.02
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termios.html
19.22
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test.html
61.42
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textwrap.html
32.28
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thread.html
22.67
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threading.html
92.04
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time.html
65.55
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timeit.html
44.38
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tix.html
56.73
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tk.html
26.76
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tkinter.html
86.67
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token.html
27.31
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tokenize.html
21.69
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trace.html
33.91
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traceback.html
44.22
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ttk.html
123.83
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tty.html
10.95
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turtle.html
246.17
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types.html
33.66
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undoc.html
25.54
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unicodedata.html
22.64
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unittest.html
246.75
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unix.html
11.9
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urllib.html
71.61
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urllib2.html
128.77
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urlparse.html
49.04
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user.html
13.41
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userdict.html
32.96
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uu.html
13.25
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uuid.html
33.55
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warnings.html
51.86
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wave.html
29.08
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weakref.html
41.14
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webbrowser.html
29.53
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whichdb.html
10.44
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windows.html
10.37
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winsound.html
22.56
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wsgiref.html
94.38
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xdrlib.html
38.05
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xml.dom.html
110.39
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xml.dom.minidom.html
45.23
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xml.dom.pulldom.html
16.32
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xml.etree.elementtree.html
124.2
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xml.html
18.76
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xml.sax.handler.html
47.5
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xml.sax.html
26.04
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xml.sax.reader.html
51.4
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xml.sax.utils.html
18.11
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xmlrpclib.html
71.79
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zipfile.html
67.26
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zipimport.html
24.32
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zlib.html
34.41
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You should install the python3 and python3-doc packages and read the <a href="file:///usr/share/doc/python3-doc/html/library/hashlib.html"> Python documentation for the Python3 version packaged in this release</a>. </div> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" accesskey="I">index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="hmac.html" title="14.2. hmac — Keyed-Hashing for Message Authentication" accesskey="N">next</a> |</li> <li class="right" > <a href="crypto.html" title="14. Cryptographic Services" accesskey="P">previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="https://www.python.org/">Python</a> »</li> <li> <a href="../index.html">Python 2.7.18 documentation</a> » </li> <li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> »</li> <li class="nav-item nav-item-2"><a href="crypto.html" accesskey="U"><span class="section-number">14. </span>Cryptographic Services</a> »</li> <li class="nav-item nav-item-this"><a href=""><span class="section-number">14.1. </span><code class="xref py py-mod docutils literal notranslate"><span class="pre">hashlib</span></code> — Secure hashes and message digests</a></li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body" role="main"> <section id="module-hashlib"> <span id="hashlib-secure-hashes-and-message-digests"></span><h1><span class="section-number">14.1. </span><a class="reference internal" href="#module-hashlib" title="hashlib: Secure hash and message digest algorithms."><code class="xref py py-mod docutils literal notranslate"><span class="pre">hashlib</span></code></a> — Secure hashes and message digests<a class="headerlink" href="#module-hashlib" title="Permalink to this headline">¶</a></h1> <div class="versionadded"> <p><span class="versionmodified added">New in version 2.5.</span></p> </div> <p id="index-0"><strong>Source code:</strong> <a class="reference external" href="https://github.com/python/cpython/tree/2.7/Lib/hashlib.py">Lib/hashlib.py</a></p> <hr class="docutils" /> <p>This module implements a common interface to many different secure hash and message digest algorithms. Included are the FIPS secure hash algorithms SHA1, SHA224, SHA256, SHA384, and SHA512 (defined in FIPS 180-2) as well as RSA’s MD5 algorithm (defined in Internet <span class="target" id="index-1"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc1321.html"><strong>RFC 1321</strong></a>). The terms secure hash and message digest are interchangeable. Older algorithms were called message digests. The modern term is secure hash.</p> <div class="admonition note"> <p class="admonition-title">Note</p> <p>If you want the adler32 or crc32 hash functions, they are available in the <a class="reference internal" href="zlib.html#module-zlib" title="zlib: Low-level interface to compression and decompression routines compatible with gzip."><code class="xref py py-mod docutils literal notranslate"><span class="pre">zlib</span></code></a> module.</p> </div> <div class="admonition warning"> <p class="admonition-title">Warning</p> <p>Some algorithms have known hash collision weaknesses, refer to the “See also” section at the end.</p> </div> <p>There is one constructor method named for each type of <em class="dfn">hash</em>. All return a hash object with the same simple interface. For example: use <code class="xref py py-func docutils literal notranslate"><span class="pre">sha1()</span></code> to create a SHA1 hash object. You can now feed this object with arbitrary strings using the <code class="xref py py-meth docutils literal notranslate"><span class="pre">update()</span></code> method. At any point you can ask it for the <em class="dfn">digest</em> of the concatenation of the strings fed to it so far using the <code class="xref py py-meth docutils literal notranslate"><span class="pre">digest()</span></code> or <code class="xref py py-meth docutils literal notranslate"><span class="pre">hexdigest()</span></code> methods.</p> <p id="index-2">Constructors for hash algorithms that are always present in this module are <a class="reference internal" href="md5.html#module-md5" title="md5: RSA's MD5 message digest algorithm. (deprecated)"><code class="xref py py-func docutils literal notranslate"><span class="pre">md5()</span></code></a>, <code class="xref py py-func docutils literal notranslate"><span class="pre">sha1()</span></code>, <code class="xref py py-func docutils literal notranslate"><span class="pre">sha224()</span></code>, <code class="xref py py-func docutils literal notranslate"><span class="pre">sha256()</span></code>, <code class="xref py py-func docutils literal notranslate"><span class="pre">sha384()</span></code>, and <code class="xref py py-func docutils literal notranslate"><span class="pre">sha512()</span></code>. Additional algorithms may also be available depending upon the OpenSSL library that Python uses on your platform.</p> <p>For example, to obtain the digest of the string <code class="docutils literal notranslate"><span class="pre">'Nobody</span> <span class="pre">inspects</span> <span class="pre">the</span> <span class="pre">spammish</span> <span class="pre">repetition'</span></code>:</p> <div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">hashlib</span> <span class="gp">>>> </span><span class="n">m</span> <span class="o">=</span> <span class="n">hashlib</span><span class="o">.</span><span class="n">md5</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">m</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="s2">"Nobody inspects"</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">m</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="s2">" the spammish repetition"</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">m</span><span class="o">.</span><span class="n">digest</span><span class="p">()</span> <span class="go">'\xbbd\x9c\x83\xdd\x1e\xa5\xc9\xd9\xde\xc9\xa1\x8d\xf0\xff\xe9'</span> <span class="gp">>>> </span><span class="n">m</span><span class="o">.</span><span class="n">digest_size</span> <span class="go">16</span> <span class="gp">>>> </span><span class="n">m</span><span class="o">.</span><span class="n">block_size</span> <span class="go">64</span> </pre></div> </div> <p>More condensed:</p> <div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="n">hashlib</span><span class="o">.</span><span class="n">sha224</span><span class="p">(</span><span class="s2">"Nobody inspects the spammish repetition"</span><span class="p">)</span><span class="o">.</span><span class="n">hexdigest</span><span class="p">()</span> <span class="go">'a4337bc45a8fc544c03f52dc550cd6e1e87021bc896588bd79e901e2'</span> </pre></div> </div> <p>A generic <a class="reference internal" href="new.html#module-new" title="new: Interface to the creation of runtime implementation objects. (deprecated)"><code class="xref py py-func docutils literal notranslate"><span class="pre">new()</span></code></a> constructor that takes the string name of the desired algorithm as its first parameter also exists to allow access to the above listed hashes as well as any other algorithms that your OpenSSL library may offer. The named constructors are much faster than <a class="reference internal" href="new.html#module-new" title="new: Interface to the creation of runtime implementation objects. (deprecated)"><code class="xref py py-func docutils literal notranslate"><span class="pre">new()</span></code></a> and should be preferred.</p> <p>Using <a class="reference internal" href="new.html#module-new" title="new: Interface to the creation of runtime implementation objects. (deprecated)"><code class="xref py py-func docutils literal notranslate"><span class="pre">new()</span></code></a> with an algorithm provided by OpenSSL:</p> <div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="n">h</span> <span class="o">=</span> <span class="n">hashlib</span><span class="o">.</span><span class="n">new</span><span class="p">(</span><span class="s1">'ripemd160'</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">h</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="s2">"Nobody inspects the spammish repetition"</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">h</span><span class="o">.</span><span class="n">hexdigest</span><span class="p">()</span> <span class="go">'cc4a5ce1b3df48aec5d22d1f16b894a0b894eccc'</span> </pre></div> </div> <p>This module provides the following constant attribute:</p> <dl class="py data"> <dt class="sig sig-object py" id="hashlib.hashlib.algorithms"> <span class="sig-prename descclassname"><span class="pre">hashlib.</span></span><span class="sig-name descname"><span class="pre">algorithms</span></span><a class="headerlink" href="#hashlib.hashlib.algorithms" title="Permalink to this definition">¶</a></dt> <dd><p>A tuple providing the names of the hash algorithms guaranteed to be supported by this module.</p> <div class="versionadded"> <p><span class="versionmodified added">New in version 2.7.</span></p> </div> </dd></dl> <dl class="py data"> <dt class="sig sig-object py" id="hashlib.algorithms_guaranteed"> <span class="sig-prename descclassname"><span class="pre">hashlib.</span></span><span class="sig-name descname"><span class="pre">algorithms_guaranteed</span></span><a class="headerlink" href="#hashlib.algorithms_guaranteed" title="Permalink to this definition">¶</a></dt> <dd><p>A set containing the names of the hash algorithms guaranteed to be supported by this module on all platforms.</p> <div class="versionadded"> <p><span class="versionmodified added">New in version 2.7.9.</span></p> </div> </dd></dl> <dl class="py data"> <dt class="sig sig-object py" id="hashlib.algorithms_available"> <span class="sig-prename descclassname"><span class="pre">hashlib.</span></span><span class="sig-name descname"><span class="pre">algorithms_available</span></span><a class="headerlink" href="#hashlib.algorithms_available" title="Permalink to this definition">¶</a></dt> <dd><p>A set containing the names of the hash algorithms that are available in the running Python interpreter. These names will be recognized when passed to <a class="reference internal" href="new.html#module-new" title="new: Interface to the creation of runtime implementation objects. (deprecated)"><code class="xref py py-func docutils literal notranslate"><span class="pre">new()</span></code></a>. <a class="reference internal" href="#hashlib.algorithms_guaranteed" title="hashlib.algorithms_guaranteed"><code class="xref py py-attr docutils literal notranslate"><span class="pre">algorithms_guaranteed</span></code></a> will always be a subset. The same algorithm may appear multiple times in this set under different names (thanks to OpenSSL).</p> <div class="versionadded"> <p><span class="versionmodified added">New in version 2.7.9.</span></p> </div> </dd></dl> <p>The following values are provided as constant attributes of the hash objects returned by the constructors:</p> <dl class="py data"> <dt class="sig sig-object py" id="hashlib.hash.digest_size"> <span class="sig-prename descclassname"><span class="pre">hash.</span></span><span class="sig-name descname"><span class="pre">digest_size</span></span><a class="headerlink" href="#hashlib.hash.digest_size" title="Permalink to this definition">¶</a></dt> <dd><p>The size of the resulting hash in bytes.</p> </dd></dl> <dl class="py data"> <dt class="sig sig-object py" id="hashlib.hash.block_size"> <span class="sig-prename descclassname"><span class="pre">hash.</span></span><span class="sig-name descname"><span class="pre">block_size</span></span><a class="headerlink" href="#hashlib.hash.block_size" title="Permalink to this definition">¶</a></dt> <dd><p>The internal block size of the hash algorithm in bytes.</p> </dd></dl> <p>A hash object has the following methods:</p> <dl class="py method"> <dt class="sig sig-object py" id="hashlib.hash.update"> <span class="sig-prename descclassname"><span class="pre">hash.</span></span><span class="sig-name descname"><span class="pre">update</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">arg</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#hashlib.hash.update" title="Permalink to this definition">¶</a></dt> <dd><p>Update the hash object with the string <em>arg</em>. Repeated calls are equivalent to a single call with the concatenation of all the arguments: <code class="docutils literal notranslate"><span class="pre">m.update(a);</span> <span class="pre">m.update(b)</span></code> is equivalent to <code class="docutils literal notranslate"><span class="pre">m.update(a+b)</span></code>.</p> <div class="versionchanged"> <p><span class="versionmodified changed">Changed in version 2.7: </span>The Python GIL is released to allow other threads to run while hash updates on data larger than 2048 bytes is taking place when using hash algorithms supplied by OpenSSL.</p> </div> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="hashlib.hash.digest"> <span class="sig-prename descclassname"><span class="pre">hash.</span></span><span class="sig-name descname"><span class="pre">digest</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#hashlib.hash.digest" title="Permalink to this definition">¶</a></dt> <dd><p>Return the digest of the strings passed to the <a class="reference internal" href="#hashlib.hash.update" title="hashlib.hash.update"><code class="xref py py-meth docutils literal notranslate"><span class="pre">update()</span></code></a> method so far. This is a string of <a class="reference internal" href="#hashlib.hash.digest_size" title="hashlib.hash.digest_size"><code class="xref py py-attr docutils literal notranslate"><span class="pre">digest_size</span></code></a> bytes which may contain non-ASCII characters, including null bytes.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="hashlib.hash.hexdigest"> <span class="sig-prename descclassname"><span class="pre">hash.</span></span><span class="sig-name descname"><span class="pre">hexdigest</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#hashlib.hash.hexdigest" title="Permalink to this definition">¶</a></dt> <dd><p>Like <a class="reference internal" href="#hashlib.hash.digest" title="hashlib.hash.digest"><code class="xref py py-meth docutils literal notranslate"><span class="pre">digest()</span></code></a> except the digest is returned as a string of double length, containing only hexadecimal digits. This may be used to exchange the value safely in email or other non-binary environments.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="hashlib.hash.copy"> <span class="sig-prename descclassname"><span class="pre">hash.</span></span><span class="sig-name descname"><span class="pre">copy</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#hashlib.hash.copy" title="Permalink to this definition">¶</a></dt> <dd><p>Return a copy (“clone”) of the hash object. This can be used to efficiently compute the digests of strings that share a common initial substring.</p> </dd></dl> <section id="key-derivation"> <h2><span class="section-number">14.1.1. </span>Key derivation<a class="headerlink" href="#key-derivation" title="Permalink to this headline">¶</a></h2> <p>Key derivation and key stretching algorithms are designed for secure password hashing. Naive algorithms such as <code class="docutils literal notranslate"><span class="pre">sha1(password)</span></code> are not resistant against brute-force attacks. A good password hashing function must be tunable, slow, and include a <a class="reference external" href="https://en.wikipedia.org/wiki/Salt_%28cryptography%29">salt</a>.</p> <dl class="py function"> <dt class="sig sig-object py" id="hashlib.pbkdf2_hmac"> <span class="sig-prename descclassname"><span class="pre">hashlib.</span></span><span class="sig-name descname"><span class="pre">pbkdf2_hmac</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">name</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">password</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">salt</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">rounds</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">dklen</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#hashlib.pbkdf2_hmac" title="Permalink to this definition">¶</a></dt> <dd><p>The function provides PKCS#5 password-based key derivation function 2. It uses HMAC as pseudorandom function.</p> <p>The string <em>name</em> is the desired name of the hash digest algorithm for HMAC, e.g. ‘sha1’ or ‘sha256’. <em>password</em> and <em>salt</em> are interpreted as buffers of bytes. Applications and libraries should limit <em>password</em> to a sensible value (e.g. 1024). <em>salt</em> should be about 16 or more bytes from a proper source, e.g. <a class="reference internal" href="os.html#os.urandom" title="os.urandom"><code class="xref py py-func docutils literal notranslate"><span class="pre">os.urandom()</span></code></a>.</p> <p>The number of <em>rounds</em> should be chosen based on the hash algorithm and computing power. As of 2013, at least 100,000 rounds of SHA-256 is suggested.</p> <p><em>dklen</em> is the length of the derived key. If <em>dklen</em> is <code class="docutils literal notranslate"><span class="pre">None</span></code> then the digest size of the hash algorithm <em>name</em> is used, e.g. 64 for SHA-512.</p> <div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">hashlib</span><span class="o">,</span> <span class="nn">binascii</span> <span class="gp">>>> </span><span class="n">dk</span> <span class="o">=</span> <span class="n">hashlib</span><span class="o">.</span><span class="n">pbkdf2_hmac</span><span class="p">(</span><span class="s1">'sha256'</span><span class="p">,</span> <span class="sa">b</span><span class="s1">'password'</span><span class="p">,</span> <span class="sa">b</span><span class="s1">'salt'</span><span class="p">,</span> <span class="mi">100000</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">binascii</span><span class="o">.</span><span class="n">hexlify</span><span class="p">(</span><span class="n">dk</span><span class="p">)</span> <span class="go">b'0394a2ede332c9a13eb82e9b24631604c31df978b4e2f0fbd2c549944f9d79a5'</span> </pre></div> </div> <div class="versionadded"> <p><span class="versionmodified added">New in version 2.7.8.</span></p> </div> <div class="admonition note"> <p class="admonition-title">Note</p> <p>A fast implementation of <em>pbkdf2_hmac</em> is available with OpenSSL. The Python implementation uses an inline version of <a class="reference internal" href="hmac.html#module-hmac" title="hmac: Keyed-Hashing for Message Authentication (HMAC) implementation"><code class="xref py py-mod docutils literal notranslate"><span class="pre">hmac</span></code></a>. It is about three times slower and doesn’t release the GIL.</p> </div> </dd></dl> <div class="admonition seealso"> <p class="admonition-title">See also</p> <dl class="simple"> <dt>Module <a class="reference internal" href="hmac.html#module-hmac" title="hmac: Keyed-Hashing for Message Authentication (HMAC) implementation"><code class="xref py py-mod docutils literal notranslate"><span class="pre">hmac</span></code></a></dt><dd><p>A module to generate message authentication codes using hashes.</p> </dd> <dt>Module <a class="reference internal" href="base64.html#module-base64" title="base64: RFC 3548: Base16, Base32, Base64 Data Encodings"><code class="xref py py-mod docutils literal notranslate"><span class="pre">base64</span></code></a></dt><dd><p>Another way to encode binary hashes for non-binary environments.</p> </dd> <dt><a class="reference external" href="http://csrc.nist.gov/publications/fips/fips180-2/fips180-2.pdf">http://csrc.nist.gov/publications/fips/fips180-2/fips180-2.pdf</a></dt><dd><p>The FIPS 180-2 publication on Secure Hash Algorithms.</p> </dd> <dt><a class="reference external" href="https://en.wikipedia.org/wiki/Cryptographic_hash_function#Cryptographic_hash_algorithms">https://en.wikipedia.org/wiki/Cryptographic_hash_function#Cryptographic_hash_algorithms</a></dt><dd><p>Wikipedia article with information on which algorithms have known issues and what that means regarding their use.</p> </dd> </dl> </div> </section> </section> <div class="clearer"></div> </div> </div> </div> <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> <div class="sphinxsidebarwrapper"> <h3><a href="../contents.html">Table of Contents</a></h3> <ul> <li><a class="reference internal" href="#">14.1. <code class="xref py py-mod docutils literal notranslate"><span class="pre">hashlib</span></code> — Secure hashes and message digests</a><ul> <li><a class="reference internal" href="#key-derivation">14.1.1. Key derivation</a></li> </ul> </li> </ul> <h4>Previous topic</h4> <p class="topless"><a href="crypto.html" title="previous chapter"><span class="section-number">14. </span>Cryptographic Services</a></p> <h4>Next topic</h4> <p class="topless"><a href="hmac.html" title="next chapter"><span class="section-number">14.2. </span><code class="xref py py-mod docutils literal notranslate"><span class="pre">hmac</span></code> — Keyed-Hashing for Message Authentication</a></p> <div role="note" aria-label="source link"> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../_sources/library/hashlib.rst.txt" rel="nofollow">Show Source</a></li> </ul> </div> <div id="searchbox" style="display: none" role="search"> <h3 id="searchlabel">Quick search</h3> <div class="searchformwrapper"> <form class="search" action="../search.html" method="get"> <input type="text" name="q" aria-labelledby="searchlabel" autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false"/> <input type="submit" value="Go" /> </form> </div> </div> <script>$('#searchbox').show(0);</script> </div> </div> <div class="clearer"></div> </div> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" >index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="hmac.html" title="14.2. hmac — Keyed-Hashing for Message Authentication" >next</a> |</li> <li class="right" > <a href="crypto.html" title="14. 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