cpython/Doc/library/hashlib.rst

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:mod:`hashlib` --- Secure hashes and message digests
====================================================
.. module:: hashlib
:synopsis: Secure hash and message digest algorithms.
Merged revisions 68450,68480-68481,68493,68495,68501,68512,68514-68515,68534-68536,68552,68563,68570-68572,68575,68582,68596,68623-68624,68628 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r68450 | jeffrey.yasskin | 2009-01-09 10:47:07 -0600 (Fri, 09 Jan 2009) | 3 lines Fix issue 4884, preventing a crash in the socket code when python is compiled with llvm-gcc and run with a glibc <2.10. ........ r68480 | vinay.sajip | 2009-01-10 07:38:04 -0600 (Sat, 10 Jan 2009) | 1 line Minor documentation changes cross-referencing NullHandler to the documentation on configuring logging in a library. ........ r68481 | vinay.sajip | 2009-01-10 07:42:04 -0600 (Sat, 10 Jan 2009) | 1 line Corrected an incorrect self-reference. ........ r68493 | benjamin.peterson | 2009-01-10 11:18:55 -0600 (Sat, 10 Jan 2009) | 1 line rewrite verbose conditionals ........ r68495 | benjamin.peterson | 2009-01-10 11:36:44 -0600 (Sat, 10 Jan 2009) | 1 line tp_iter only exists with Py_TPFLAGS_HAVE_ITER #4901 ........ r68501 | vinay.sajip | 2009-01-10 13:22:57 -0600 (Sat, 10 Jan 2009) | 1 line Corrected minor typo and added .currentmodule directives to fix missing cross-references. ........ r68512 | benjamin.peterson | 2009-01-10 16:42:10 -0600 (Sat, 10 Jan 2009) | 1 line make tests fail if they can't be imported ........ r68514 | benjamin.peterson | 2009-01-10 17:41:59 -0600 (Sat, 10 Jan 2009) | 1 line move seealso to a more appropiate place ........ r68515 | benjamin.peterson | 2009-01-10 17:49:08 -0600 (Sat, 10 Jan 2009) | 1 line macos 9 isn't supported ........ r68534 | gregory.p.smith | 2009-01-11 11:53:33 -0600 (Sun, 11 Jan 2009) | 2 lines correct email address ........ r68535 | gregory.p.smith | 2009-01-11 11:57:54 -0600 (Sun, 11 Jan 2009) | 9 lines Update the documentation for binascii and zlib crc32/adler32 functions to better describe the signed vs unsigned return value behavior on different platforms and versions of python. Mention the workaround to make them all return the same thing by using & 0xffffffff. Fixes issue4903. Also needs to be merged into release26-maint, release30-maint, & py3k. ........ r68536 | benjamin.peterson | 2009-01-11 13:48:15 -0600 (Sun, 11 Jan 2009) | 1 line add email addresses ........ r68552 | vinay.sajip | 2009-01-12 14:36:18 -0600 (Mon, 12 Jan 2009) | 1 line Minor changes/corrections in markup. ........ r68563 | benjamin.peterson | 2009-01-12 19:49:10 -0600 (Mon, 12 Jan 2009) | 1 line small logic correction ........ r68570 | raymond.hettinger | 2009-01-13 03:08:32 -0600 (Tue, 13 Jan 2009) | 5 lines Issue 4922: Incorrect comments for MutableSet.add() and MutableSet.discard(). Needs to be backported to 2.6 and forward ported to 3.0 and 3.1. ........ r68571 | armin.ronacher | 2009-01-13 05:52:23 -0600 (Tue, 13 Jan 2009) | 3 lines ast.literal_eval can properly evaluate complex numbers now. This fixes issue4907. ........ r68572 | andrew.kuchling | 2009-01-13 07:40:54 -0600 (Tue, 13 Jan 2009) | 1 line Note that first coord. is left alone ........ r68575 | thomas.heller | 2009-01-13 11:32:28 -0600 (Tue, 13 Jan 2009) | 1 line Fix refcount leak in error cases. Bug found by coverity. ........ r68582 | georg.brandl | 2009-01-13 16:14:01 -0600 (Tue, 13 Jan 2009) | 2 lines Use assertRaises. ........ r68596 | amaury.forgeotdarc | 2009-01-13 17:39:22 -0600 (Tue, 13 Jan 2009) | 3 lines #1162154: inspect.getmembers() now skips attributes that raise AttributeError, e.g. a __slots__ attribute which has not been set. ........ r68623 | vinay.sajip | 2009-01-15 16:48:13 -0600 (Thu, 15 Jan 2009) | 1 line Made minor changes/corrections in markup. Added a couple of section headings. ........ r68624 | vinay.sajip | 2009-01-15 17:04:47 -0600 (Thu, 15 Jan 2009) | 1 line Minor changes/corrections in markup. ........ r68628 | benjamin.peterson | 2009-01-15 20:55:24 -0600 (Thu, 15 Jan 2009) | 1 line compare with == not is #4946 ........
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.. moduleauthor:: Gregory P. Smith <greg@krypto.org>
.. sectionauthor:: Gregory P. Smith <greg@krypto.org>
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**Source code:** :source:`Lib/hashlib.py`
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.. index::
single: message digest, MD5
single: secure hash algorithm, SHA1, SHA224, SHA256, SHA384, SHA512
.. testsetup::
import hashlib
2011-01-27 16:38:46 -04:00
--------------
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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 :rfc:`1321`). The terms "secure hash" and
"message digest" are interchangeable. Older algorithms were called message
digests. The modern term is secure hash.
2007-08-15 11:28:22 -03:00
Merged revisions 61538-61540,61556,61559-61560,61563,61565,61571,61575-61576,61580-61582,61586,61591,61593,61595,61605-61606,61613-61616,61618,61621-61623,61625,61627,61631-61634 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r61538 | steven.bethard | 2008-03-18 20:03:50 +0100 (Di, 18 Mär 2008) | 1 line cell_compare needs to return -2 instead of NULL. ........ r61539 | steven.bethard | 2008-03-18 20:04:32 +0100 (Di, 18 Mär 2008) | 1 line _have_soundcard() is a bad check for winsound.Beep, since you can have a soundcard but have the beep driver disabled. This revision basically disables the beep tests by wrapping them in a try/except. The Right Way To Do It is to come up with a _have_enabled_beep_driver() and use that. ........ r61540 | gregory.p.smith | 2008-03-18 20:05:32 +0100 (Di, 18 Mär 2008) | 8 lines Fix chown on 64-bit linux. It needed to take a long (64-bit on 64bit linux) as uid and gid input to accept values >=2**31 as valid while still accepting negative numbers to pass -1 to chown for "no change". Fixes issue1747858. This should be backported to release25-maint. ........ r61556 | steven.bethard | 2008-03-18 20:59:14 +0100 (Di, 18 Mär 2008) | 1 line Fix test_atexit so that it still passes when -3 is supplied. (It was catching the warning messages on stdio from using the reload() function.) ........ r61559 | neal.norwitz | 2008-03-18 21:30:38 +0100 (Di, 18 Mär 2008) | 1 line Import the test properly. This is especially important for py3k. ........ r61560 | gregory.p.smith | 2008-03-18 21:40:01 +0100 (Di, 18 Mär 2008) | 2 lines news entry for the chown fix ........ r61563 | brett.cannon | 2008-03-18 22:12:42 +0100 (Di, 18 Mär 2008) | 2 lines Ignore BIG5HKSCS-2004.TXT which is downloaded as part of a test. ........ r61565 | steven.bethard | 2008-03-18 22:30:13 +0100 (Di, 18 Mär 2008) | 1 line Have regrtest skip test_py3kwarn when the -3 flag is missing. ........ r61571 | gregory.p.smith | 2008-03-18 23:27:41 +0100 (Di, 18 Mär 2008) | 4 lines Add a test to make sure zlib.crc32 and binascii.crc32 return the same thing. Fix a buglet in binascii.crc32, the second optional argument could previously have a signedness mismatch with the C variable its going into. ........ r61575 | raymond.hettinger | 2008-03-19 00:22:29 +0100 (Mi, 19 Mär 2008) | 1 line Speed-up isinstance() for one easy case. ........ r61576 | raymond.hettinger | 2008-03-19 00:33:08 +0100 (Mi, 19 Mär 2008) | 1 line Issue: 2354: Add 3K warning for the cmp argument to list.sort() and sorted(). ........ r61580 | andrew.kuchling | 2008-03-19 02:05:35 +0100 (Mi, 19 Mär 2008) | 1 line Add Jeff Rush ........ r61581 | gregory.p.smith | 2008-03-19 02:38:35 +0100 (Mi, 19 Mär 2008) | 3 lines Mention that crc32 and adler32 are available in a different module (zlib). Some people look for them in hashlib. ........ r61582 | gregory.p.smith | 2008-03-19 02:46:10 +0100 (Mi, 19 Mär 2008) | 3 lines Use zlib's crc32 routine instead of binascii when available. zlib's is faster when compiled properly optimized and about the same speed otherwise. ........ r61586 | david.wolever | 2008-03-19 03:26:57 +0100 (Mi, 19 Mär 2008) | 1 line Added my name to ACKS ........ r61591 | gregory.p.smith | 2008-03-19 04:14:41 +0100 (Mi, 19 Mär 2008) | 5 lines Fix the struct module DeprecationWarnings that zipfile was triggering by removing all use of signed struct values. test_zipfile and test_zipfile64 pass. no more warnings. ........ r61593 | raymond.hettinger | 2008-03-19 04:56:59 +0100 (Mi, 19 Mär 2008) | 1 line Fix compiler warning. ........ r61595 | martin.v.loewis | 2008-03-19 05:39:13 +0100 (Mi, 19 Mär 2008) | 2 lines Issue #2400: Allow relative imports to "import *". ........ r61605 | martin.v.loewis | 2008-03-19 07:00:28 +0100 (Mi, 19 Mär 2008) | 2 lines Import relimport using a relative import. ........ r61606 | trent.nelson | 2008-03-19 07:28:24 +0100 (Mi, 19 Mär 2008) | 1 line Issue2290: Support x64 Windows builds that live in pcbuild/amd64. Without it, sysutils._python_build() returns the wrong directory, which causes the test_get_config_h_filename method in Lib/distutils/tests/test_sysconfig.py to fail. ........ r61613 | trent.nelson | 2008-03-19 08:45:19 +0100 (Mi, 19 Mär 2008) | 3 lines Refine the Visual Studio 2008 build solution in order to improve how we deal with external components, as well as fixing outstanding issues with Windows x64 build support. Introduce two new .vcproj files, _bsddb44.vcproj and sqlite3.vcproj, which replace the previous pre-link event scripts for _bsddb and _sqlite3 respectively. The new project files inherit from our property files as if they were any other Python module. This has numerous benefits. First, the components get built with exactly the same compiler flags and settings as the rest of Python. Second, it makes it much easier to debug problems in the external components when they're part of the build system. Third, they'll benefit from profile guided optimisation in the release builds, just like the rest of Python core. I've also introduced a slightly new pattern for managing externals in subversion. New components get checked in as <name>-<version>.x, where <version> matches the exact vendor version string. After the initial import of the external component, the .x is tagged as .0 (i.e. tcl-8.4.18.x -> tcl-8.4.18.0). Some components may not need any tweaking, whereas there are others that might (tcl/tk fall into this bucket). In that case, the relevant modifications are made to the .x branch, which will be subsequently tagged as .1 (and then n+1 going forward) when they build successfully and all tests pass. Buildbots will be converted to rely on these explicit tags only, which makes it easy for us to switch them over to a new version as and when required. (Simple change to external(-amd64).bat: if we've bumped tcl to 8.4.18.1, change the .bat to rmdir 8.4.18.0 if it exists and check out a new .1 copy.) ........ r61614 | trent.nelson | 2008-03-19 08:56:39 +0100 (Mi, 19 Mär 2008) | 1 line Remove extraneous apostrophe and semi-colon from AdditionalIncludeDirectories. ........ r61615 | georg.brandl | 2008-03-19 08:56:40 +0100 (Mi, 19 Mär 2008) | 2 lines Remove footnote from versionchanged as it upsets LaTeX. ........ r61616 | georg.brandl | 2008-03-19 08:57:57 +0100 (Mi, 19 Mär 2008) | 2 lines Another one. ........ r61618 | trent.nelson | 2008-03-19 09:06:03 +0100 (Mi, 19 Mär 2008) | 1 line Fix the tcl-8.4.18.1 path and make sure we cd into the right directory when building tcl/tk. ........ r61621 | trent.nelson | 2008-03-19 10:23:08 +0100 (Mi, 19 Mär 2008) | 1 line Lets have another try at getting the Windows buildbots in a consistent state before rebuilding using the new process. ........ r61622 | eric.smith | 2008-03-19 13:09:55 +0100 (Mi, 19 Mär 2008) | 2 lines Use test.test_support.captured_stdout instead of a custom contextmanager. Thanks Nick Coghlan. ........ r61623 | eric.smith | 2008-03-19 13:15:10 +0100 (Mi, 19 Mär 2008) | 1 line Trivial typo. ........ r61625 | thomas.heller | 2008-03-19 17:10:57 +0100 (Mi, 19 Mär 2008) | 2 lines Checkout sqlite-source when it is not there. ........ r61627 | brett.cannon | 2008-03-19 17:50:13 +0100 (Mi, 19 Mär 2008) | 5 lines test_nis would fail if test.test_support.verbose was true but NIS was not set up on the machine. Closes issue2411. Thanks Michael Bishop. ........ r61631 | brett.cannon | 2008-03-19 18:37:43 +0100 (Mi, 19 Mär 2008) | 2 lines Use sys.py3kwarning instead of trying to trigger a Py3k-related warning. ........ r61632 | raymond.hettinger | 2008-03-19 18:45:19 +0100 (Mi, 19 Mär 2008) | 1 line Issue 2354: Fix-up compare warning. Patch contributed by Jeff Balogh. ........ r61633 | raymond.hettinger | 2008-03-19 18:58:59 +0100 (Mi, 19 Mär 2008) | 1 line The filter() function does support a None argument in Py3.0. ........ r61634 | raymond.hettinger | 2008-03-19 19:01:58 +0100 (Mi, 19 Mär 2008) | 1 line Remove itertools warnings I had added before the 2-to-3 handled the migration. ........
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.. note::
If you want the adler32 or crc32 hash functions, they are available in
Merged revisions 61538-61540,61556,61559-61560,61563,61565,61571,61575-61576,61580-61582,61586,61591,61593,61595,61605-61606,61613-61616,61618,61621-61623,61625,61627,61631-61634 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r61538 | steven.bethard | 2008-03-18 20:03:50 +0100 (Di, 18 Mär 2008) | 1 line cell_compare needs to return -2 instead of NULL. ........ r61539 | steven.bethard | 2008-03-18 20:04:32 +0100 (Di, 18 Mär 2008) | 1 line _have_soundcard() is a bad check for winsound.Beep, since you can have a soundcard but have the beep driver disabled. This revision basically disables the beep tests by wrapping them in a try/except. The Right Way To Do It is to come up with a _have_enabled_beep_driver() and use that. ........ r61540 | gregory.p.smith | 2008-03-18 20:05:32 +0100 (Di, 18 Mär 2008) | 8 lines Fix chown on 64-bit linux. It needed to take a long (64-bit on 64bit linux) as uid and gid input to accept values >=2**31 as valid while still accepting negative numbers to pass -1 to chown for "no change". Fixes issue1747858. This should be backported to release25-maint. ........ r61556 | steven.bethard | 2008-03-18 20:59:14 +0100 (Di, 18 Mär 2008) | 1 line Fix test_atexit so that it still passes when -3 is supplied. (It was catching the warning messages on stdio from using the reload() function.) ........ r61559 | neal.norwitz | 2008-03-18 21:30:38 +0100 (Di, 18 Mär 2008) | 1 line Import the test properly. This is especially important for py3k. ........ r61560 | gregory.p.smith | 2008-03-18 21:40:01 +0100 (Di, 18 Mär 2008) | 2 lines news entry for the chown fix ........ r61563 | brett.cannon | 2008-03-18 22:12:42 +0100 (Di, 18 Mär 2008) | 2 lines Ignore BIG5HKSCS-2004.TXT which is downloaded as part of a test. ........ r61565 | steven.bethard | 2008-03-18 22:30:13 +0100 (Di, 18 Mär 2008) | 1 line Have regrtest skip test_py3kwarn when the -3 flag is missing. ........ r61571 | gregory.p.smith | 2008-03-18 23:27:41 +0100 (Di, 18 Mär 2008) | 4 lines Add a test to make sure zlib.crc32 and binascii.crc32 return the same thing. Fix a buglet in binascii.crc32, the second optional argument could previously have a signedness mismatch with the C variable its going into. ........ r61575 | raymond.hettinger | 2008-03-19 00:22:29 +0100 (Mi, 19 Mär 2008) | 1 line Speed-up isinstance() for one easy case. ........ r61576 | raymond.hettinger | 2008-03-19 00:33:08 +0100 (Mi, 19 Mär 2008) | 1 line Issue: 2354: Add 3K warning for the cmp argument to list.sort() and sorted(). ........ r61580 | andrew.kuchling | 2008-03-19 02:05:35 +0100 (Mi, 19 Mär 2008) | 1 line Add Jeff Rush ........ r61581 | gregory.p.smith | 2008-03-19 02:38:35 +0100 (Mi, 19 Mär 2008) | 3 lines Mention that crc32 and adler32 are available in a different module (zlib). Some people look for them in hashlib. ........ r61582 | gregory.p.smith | 2008-03-19 02:46:10 +0100 (Mi, 19 Mär 2008) | 3 lines Use zlib's crc32 routine instead of binascii when available. zlib's is faster when compiled properly optimized and about the same speed otherwise. ........ r61586 | david.wolever | 2008-03-19 03:26:57 +0100 (Mi, 19 Mär 2008) | 1 line Added my name to ACKS ........ r61591 | gregory.p.smith | 2008-03-19 04:14:41 +0100 (Mi, 19 Mär 2008) | 5 lines Fix the struct module DeprecationWarnings that zipfile was triggering by removing all use of signed struct values. test_zipfile and test_zipfile64 pass. no more warnings. ........ r61593 | raymond.hettinger | 2008-03-19 04:56:59 +0100 (Mi, 19 Mär 2008) | 1 line Fix compiler warning. ........ r61595 | martin.v.loewis | 2008-03-19 05:39:13 +0100 (Mi, 19 Mär 2008) | 2 lines Issue #2400: Allow relative imports to "import *". ........ r61605 | martin.v.loewis | 2008-03-19 07:00:28 +0100 (Mi, 19 Mär 2008) | 2 lines Import relimport using a relative import. ........ r61606 | trent.nelson | 2008-03-19 07:28:24 +0100 (Mi, 19 Mär 2008) | 1 line Issue2290: Support x64 Windows builds that live in pcbuild/amd64. Without it, sysutils._python_build() returns the wrong directory, which causes the test_get_config_h_filename method in Lib/distutils/tests/test_sysconfig.py to fail. ........ r61613 | trent.nelson | 2008-03-19 08:45:19 +0100 (Mi, 19 Mär 2008) | 3 lines Refine the Visual Studio 2008 build solution in order to improve how we deal with external components, as well as fixing outstanding issues with Windows x64 build support. Introduce two new .vcproj files, _bsddb44.vcproj and sqlite3.vcproj, which replace the previous pre-link event scripts for _bsddb and _sqlite3 respectively. The new project files inherit from our property files as if they were any other Python module. This has numerous benefits. First, the components get built with exactly the same compiler flags and settings as the rest of Python. Second, it makes it much easier to debug problems in the external components when they're part of the build system. Third, they'll benefit from profile guided optimisation in the release builds, just like the rest of Python core. I've also introduced a slightly new pattern for managing externals in subversion. New components get checked in as <name>-<version>.x, where <version> matches the exact vendor version string. After the initial import of the external component, the .x is tagged as .0 (i.e. tcl-8.4.18.x -> tcl-8.4.18.0). Some components may not need any tweaking, whereas there are others that might (tcl/tk fall into this bucket). In that case, the relevant modifications are made to the .x branch, which will be subsequently tagged as .1 (and then n+1 going forward) when they build successfully and all tests pass. Buildbots will be converted to rely on these explicit tags only, which makes it easy for us to switch them over to a new version as and when required. (Simple change to external(-amd64).bat: if we've bumped tcl to 8.4.18.1, change the .bat to rmdir 8.4.18.0 if it exists and check out a new .1 copy.) ........ r61614 | trent.nelson | 2008-03-19 08:56:39 +0100 (Mi, 19 Mär 2008) | 1 line Remove extraneous apostrophe and semi-colon from AdditionalIncludeDirectories. ........ r61615 | georg.brandl | 2008-03-19 08:56:40 +0100 (Mi, 19 Mär 2008) | 2 lines Remove footnote from versionchanged as it upsets LaTeX. ........ r61616 | georg.brandl | 2008-03-19 08:57:57 +0100 (Mi, 19 Mär 2008) | 2 lines Another one. ........ r61618 | trent.nelson | 2008-03-19 09:06:03 +0100 (Mi, 19 Mär 2008) | 1 line Fix the tcl-8.4.18.1 path and make sure we cd into the right directory when building tcl/tk. ........ r61621 | trent.nelson | 2008-03-19 10:23:08 +0100 (Mi, 19 Mär 2008) | 1 line Lets have another try at getting the Windows buildbots in a consistent state before rebuilding using the new process. ........ r61622 | eric.smith | 2008-03-19 13:09:55 +0100 (Mi, 19 Mär 2008) | 2 lines Use test.test_support.captured_stdout instead of a custom contextmanager. Thanks Nick Coghlan. ........ r61623 | eric.smith | 2008-03-19 13:15:10 +0100 (Mi, 19 Mär 2008) | 1 line Trivial typo. ........ r61625 | thomas.heller | 2008-03-19 17:10:57 +0100 (Mi, 19 Mär 2008) | 2 lines Checkout sqlite-source when it is not there. ........ r61627 | brett.cannon | 2008-03-19 17:50:13 +0100 (Mi, 19 Mär 2008) | 5 lines test_nis would fail if test.test_support.verbose was true but NIS was not set up on the machine. Closes issue2411. Thanks Michael Bishop. ........ r61631 | brett.cannon | 2008-03-19 18:37:43 +0100 (Mi, 19 Mär 2008) | 2 lines Use sys.py3kwarning instead of trying to trigger a Py3k-related warning. ........ r61632 | raymond.hettinger | 2008-03-19 18:45:19 +0100 (Mi, 19 Mär 2008) | 1 line Issue 2354: Fix-up compare warning. Patch contributed by Jeff Balogh. ........ r61633 | raymond.hettinger | 2008-03-19 18:58:59 +0100 (Mi, 19 Mär 2008) | 1 line The filter() function does support a None argument in Py3.0. ........ r61634 | raymond.hettinger | 2008-03-19 19:01:58 +0100 (Mi, 19 Mär 2008) | 1 line Remove itertools warnings I had added before the 2-to-3 handled the migration. ........
2008-03-19 18:50:51 -03:00
the :mod:`zlib` module.
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.. warning::
Some algorithms have known hash collision weaknesses, refer to the "See
also" section at the end.
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.. _hash-algorithms:
Hash algorithms
---------------
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There is one constructor method named for each type of :dfn:`hash`. All return
a hash object with the same simple interface. For example: use :func:`sha256` to
create a SHA-256 hash object. You can now feed this object with :term:`bytes-like
objects <bytes-like object>` (normally :class:`bytes`) using the :meth:`update` method.
At any point you can ask it for the :dfn:`digest` of the
concatenation of the data fed to it so far using the :meth:`digest` or
:meth:`hexdigest` methods.
.. note::
For better multithreading performance, the Python :term:`GIL` is released for
data larger than 2047 bytes at object creation or on update.
.. note::
Feeding string objects into :meth:`update` is not supported, as hashes work
on bytes, not on characters.
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Merged revisions 58095-58132,58136-58148,58151-58197 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r58096 | brett.cannon | 2007-09-10 23:38:27 +0200 (Mon, 10 Sep 2007) | 4 lines Fix a possible segfault from recursing too deep to get the repr of a list. Closes issue #1096. ........ r58097 | bill.janssen | 2007-09-10 23:51:02 +0200 (Mon, 10 Sep 2007) | 33 lines More work on SSL support. * Much expanded test suite: All protocols tested against all other protocols. All protocols tested with all certificate options. Tests for bad key and bad cert. Test of STARTTLS functionality. Test of RAND_* functions. * Fixes for threading/malloc bug. * Issue 1065 fixed: sslsocket class renamed to SSLSocket. sslerror class renamed to SSLError. Function "wrap_socket" now used to wrap an existing socket. * Issue 1583946 finally fixed: Support for subjectAltName added. Subject name now returned as proper DN list of RDNs. * SSLError exported from socket as "sslerror". * RAND_* functions properly exported from ssl.py. * Documentation improved: Example of how to create a self-signed certificate. Better indexing. ........ r58098 | guido.van.rossum | 2007-09-11 00:02:25 +0200 (Tue, 11 Sep 2007) | 9 lines Patch # 1140 (my code, approved by Effbot). Make sure the type of the return value of re.sub(x, y, z) is the type of y+x (i.e. unicode if either is unicode, str if they are both str) even if there are no substitutions or if x==z (which triggered various special cases in join_list()). Could be backported to 2.5; no need to port to 3.0. ........ r58099 | guido.van.rossum | 2007-09-11 00:36:02 +0200 (Tue, 11 Sep 2007) | 8 lines Patch # 1026 by Benjamin Aranguren (with Alex Martelli): Backport abc.py and isinstance/issubclass overloading to 2.6. I had to backport test_typechecks.py myself, and make one small change to abc.py to avoid duplicate work when x.__class__ and type(x) are the same. ........ r58100 | bill.janssen | 2007-09-11 01:41:24 +0200 (Tue, 11 Sep 2007) | 3 lines A better way of finding an open port to test with. ........ r58101 | bill.janssen | 2007-09-11 03:09:19 +0200 (Tue, 11 Sep 2007) | 4 lines Make sure test_ssl doesn't reference the ssl module in a context where it can't be imported. ........ r58102 | bill.janssen | 2007-09-11 04:42:07 +0200 (Tue, 11 Sep 2007) | 3 lines Fix some documentation bugs. ........ r58103 | nick.coghlan | 2007-09-11 16:01:18 +0200 (Tue, 11 Sep 2007) | 1 line Always use the -E flag when spawning subprocesses in test_cmd_line (Issue 1056) ........ r58106 | thomas.heller | 2007-09-11 21:17:48 +0200 (Tue, 11 Sep 2007) | 3 lines Disable some tests that fail on the 'ppc Debian unstable' buildbot to find out if they cause the segfault on the 'alpha Debian' machine. ........ r58108 | brett.cannon | 2007-09-11 23:02:28 +0200 (Tue, 11 Sep 2007) | 6 lines Generators had their throw() method allowing string exceptions. That's a no-no. Fixes issue #1147. Need to fix 2.5 to raise a proper warning if a string exception is passed in. ........ r58112 | georg.brandl | 2007-09-12 20:03:51 +0200 (Wed, 12 Sep 2007) | 3 lines New documentation page for the bdb module. (This doesn't need to be merged to Py3k.) ........ r58114 | georg.brandl | 2007-09-12 20:05:57 +0200 (Wed, 12 Sep 2007) | 2 lines Bug #1152: use non-deprecated name in example. ........ r58115 | georg.brandl | 2007-09-12 20:08:33 +0200 (Wed, 12 Sep 2007) | 2 lines Fix #1122: wrong return type documented for various _Size() functions. ........ r58117 | georg.brandl | 2007-09-12 20:10:56 +0200 (Wed, 12 Sep 2007) | 2 lines Fix #1139: PyFile_Encoding really is PyFile_SetEncoding. ........ r58119 | georg.brandl | 2007-09-12 20:29:18 +0200 (Wed, 12 Sep 2007) | 2 lines bug #1154: release memory allocated by "es" PyArg_ParseTuple format specifier. ........ r58121 | bill.janssen | 2007-09-12 20:52:05 +0200 (Wed, 12 Sep 2007) | 1 line root certificate for https://svn.python.org/, used in test_ssl ........ r58122 | georg.brandl | 2007-09-12 21:00:07 +0200 (Wed, 12 Sep 2007) | 3 lines Bug #1153: repr.repr() now doesn't require set and dictionary items to be orderable to properly represent them. ........ r58125 | georg.brandl | 2007-09-12 21:29:28 +0200 (Wed, 12 Sep 2007) | 4 lines #1120: put explicit version in the shebang lines of pydoc, idle and smtpd.py scripts that are installed by setup.py. That way, they work when only "make altinstall" is used. ........ r58139 | mark.summerfield | 2007-09-13 16:54:30 +0200 (Thu, 13 Sep 2007) | 9 lines Replaced variable o with obj in operator.rst because o is easy to confuse. Added a note about Python 3's collections.Mapping etc., above section that describes isMappingType() etc. Added xrefs between os, os.path, fileinput, and open(). ........ r58143 | facundo.batista | 2007-09-13 20:13:15 +0200 (Thu, 13 Sep 2007) | 7 lines Merged the decimal-branch (revisions 54886 to 58140). Decimal is now fully updated to the latests Decimal Specification (v1.66) and the latests test cases (v2.56). Thanks to Mark Dickinson for all his help during this process. ........ r58145 | facundo.batista | 2007-09-13 20:42:09 +0200 (Thu, 13 Sep 2007) | 7 lines Put the parameter watchexp back in (changed watchexp from an int to a bool). Also second argument to watchexp is now converted to Decimal, just as with all the other two-argument operations. Thanks Mark Dickinson. ........ r58147 | andrew.kuchling | 2007-09-14 00:49:34 +0200 (Fri, 14 Sep 2007) | 1 line Add various items ........ r58148 | andrew.kuchling | 2007-09-14 00:50:10 +0200 (Fri, 14 Sep 2007) | 1 line Make target unique ........ r58154 | facundo.batista | 2007-09-14 20:58:34 +0200 (Fri, 14 Sep 2007) | 3 lines Included the new functions, and new descriptions. ........ r58155 | thomas.heller | 2007-09-14 21:40:35 +0200 (Fri, 14 Sep 2007) | 2 lines ctypes.util.find_library uses dump(1) instead of objdump(1) on Solaris. Fixes issue #1777530; will backport to release25-maint. ........ r58159 | facundo.batista | 2007-09-14 23:29:52 +0200 (Fri, 14 Sep 2007) | 3 lines Some additions (examples and a bit on the tutorial). ........ r58160 | georg.brandl | 2007-09-15 18:53:36 +0200 (Sat, 15 Sep 2007) | 2 lines Remove bdb from the "undocumented modules" list. ........ r58164 | bill.janssen | 2007-09-17 00:06:00 +0200 (Mon, 17 Sep 2007) | 15 lines Add support for asyncore server-side SSL support. This requires adding the 'makefile' method to ssl.SSLSocket, and importing the requisite fakefile class from socket.py, and making the appropriate changes to it to make it use the SSL connection. Added sample HTTPS server to test_ssl.py, and test that uses it. Change SSL tests to use https://svn.python.org/, instead of www.sf.net and pop.gmail.com. Added utility function to ssl module, get_server_certificate, to wrap up the several things to be done to pull a certificate from a remote server. ........ r58173 | bill.janssen | 2007-09-17 01:16:46 +0200 (Mon, 17 Sep 2007) | 1 line use binary mode when reading files for testAsyncore to make Windows happy ........ r58175 | raymond.hettinger | 2007-09-17 02:55:00 +0200 (Mon, 17 Sep 2007) | 7 lines Sync-up named tuples with the latest version of the ASPN recipe. Allows optional commas in the field-name spec (help when named tuples are used in conjuction with sql queries). Adds the __fields__ attribute for introspection and to support conversion to dictionary form. Adds a __replace__() method similar to str.replace() but using a named field as a target. Clean-up spelling and presentation in doc-strings. ........ r58176 | brett.cannon | 2007-09-17 05:28:34 +0200 (Mon, 17 Sep 2007) | 5 lines Add a bunch of GIL release/acquire points in tp_print implementations and for PyObject_Print(). Closes issue #1164. ........ r58177 | sean.reifschneider | 2007-09-17 07:45:04 +0200 (Mon, 17 Sep 2007) | 2 lines issue1597011: Fix for bz2 module corner-case error due to error checking bug. ........ r58180 | facundo.batista | 2007-09-17 18:26:50 +0200 (Mon, 17 Sep 2007) | 3 lines Decimal is updated, :) ........ r58181 | facundo.batista | 2007-09-17 19:30:13 +0200 (Mon, 17 Sep 2007) | 5 lines The methods always return Decimal classes, even if they're executed through a subclass (thanks Mark Dickinson). Added a bit of testing for this. ........ r58183 | sean.reifschneider | 2007-09-17 22:53:21 +0200 (Mon, 17 Sep 2007) | 2 lines issue1082: Fixing platform and system for Vista. ........ r58185 | andrew.kuchling | 2007-09-18 03:36:16 +0200 (Tue, 18 Sep 2007) | 1 line Add item; sort properly ........ r58186 | raymond.hettinger | 2007-09-18 05:33:19 +0200 (Tue, 18 Sep 2007) | 1 line Handle corner cased on 0-tuples and 1-tuples. Add verbose option so people can see how it works. ........ r58192 | georg.brandl | 2007-09-18 09:24:40 +0200 (Tue, 18 Sep 2007) | 2 lines A bit of reordering, also show more subheadings in the lang ref index. ........ r58193 | facundo.batista | 2007-09-18 18:53:18 +0200 (Tue, 18 Sep 2007) | 4 lines Speed up of the various division operations (remainder, divide, divideint and divmod). Thanks Mark Dickinson. ........ r58197 | raymond.hettinger | 2007-09-19 00:18:02 +0200 (Wed, 19 Sep 2007) | 1 line Cleanup docs for NamedTuple. ........
2007-09-19 00:06:30 -03:00
.. index:: single: OpenSSL; (use in module hashlib)
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Constructors for hash algorithms that are always present in this module are
:func:`sha1`, :func:`sha224`, :func:`sha256`, :func:`sha384`,
:func:`sha512`, :func:`blake2b`, and :func:`blake2s`.
:func:`md5` is normally available as well, though it
may be missing or blocked if you are using a rare "FIPS compliant" build of Python.
Additional algorithms may also be available depending upon the OpenSSL
library that Python uses on your platform. On most platforms the
:func:`sha3_224`, :func:`sha3_256`, :func:`sha3_384`, :func:`sha3_512`,
:func:`shake_128`, :func:`shake_256` are also available.
.. versionadded:: 3.6
SHA3 (Keccak) and SHAKE constructors :func:`sha3_224`, :func:`sha3_256`,
:func:`sha3_384`, :func:`sha3_512`, :func:`shake_128`, :func:`shake_256`.
.. versionadded:: 3.6
:func:`blake2b` and :func:`blake2s` were added.
.. _hashlib-usedforsecurity:
.. versionchanged:: 3.9
All hashlib constructors take a keyword-only argument *usedforsecurity*
with default value ``True``. A false value allows the use of insecure and
blocked hashing algorithms in restricted environments. ``False`` indicates
that the hashing algorithm is not used in a security context, e.g. as a
non-cryptographic one-way compression function.
Hashlib now uses SHA3 and SHAKE from OpenSSL 1.1.1 and newer.
For example, to obtain the digest of the byte string ``b"Nobody inspects the
spammish repetition"``::
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>>> import hashlib
>>> m = hashlib.sha256()
>>> m.update(b"Nobody inspects")
>>> m.update(b" the spammish repetition")
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>>> m.digest()
b'\x03\x1e\xdd}Ae\x15\x93\xc5\xfe\\\x00o\xa5u+7\xfd\xdf\xf7\xbcN\x84:\xa6\xaf\x0c\x95\x0fK\x94\x06'
>>> m.hexdigest()
'031edd7d41651593c5fe5c006fa5752b37fddff7bc4e843aa6af0c950f4b9406'
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Merged revisions 61724-61725,61731-61735,61737,61739,61741,61743-61744,61753,61761,61765-61767,61769,61773,61776-61778,61780-61783,61788,61793,61796,61807,61813 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ................ r61724 | martin.v.loewis | 2008-03-22 01:01:12 +0100 (Sat, 22 Mar 2008) | 49 lines Merged revisions 61602-61723 via svnmerge from svn+ssh://pythondev@svn.python.org/sandbox/trunk/2to3/lib2to3 ........ r61626 | david.wolever | 2008-03-19 17:19:16 +0100 (Mi, 19 M?\195?\164r 2008) | 1 line Added fixer for implicit local imports. See #2414. ........ r61628 | david.wolever | 2008-03-19 17:57:43 +0100 (Mi, 19 M?\195?\164r 2008) | 1 line Added a class for tests which should not run if a particular import is found. ........ r61629 | collin.winter | 2008-03-19 17:58:19 +0100 (Mi, 19 M?\195?\164r 2008) | 1 line Two more relative import fixes in pgen2. ........ r61635 | david.wolever | 2008-03-19 20:16:03 +0100 (Mi, 19 M?\195?\164r 2008) | 1 line Fixed print fixer so it will do the Right Thing when it encounters __future__.print_function. 2to3 gets upset, though, so the tests have been commented out. ........ r61637 | david.wolever | 2008-03-19 21:37:17 +0100 (Mi, 19 M?\195?\164r 2008) | 3 lines Added a fixer for itertools imports (from itertools import imap, ifilterfalse --> from itertools import filterfalse) ........ r61645 | david.wolever | 2008-03-19 23:22:35 +0100 (Mi, 19 M?\195?\164r 2008) | 1 line SVN is happier when you add the files you create... -_-' ........ r61654 | david.wolever | 2008-03-20 01:09:56 +0100 (Do, 20 M?\195?\164r 2008) | 1 line Added an explicit sort order to fixers -- fixes problems like #2427 ........ r61664 | david.wolever | 2008-03-20 04:32:40 +0100 (Do, 20 M?\195?\164r 2008) | 3 lines Fixes #2428 -- comments are no longer eatten by __future__ fixer. ........ r61673 | david.wolever | 2008-03-20 17:22:40 +0100 (Do, 20 M?\195?\164r 2008) | 1 line Added 2to3 node pretty-printer ........ r61679 | david.wolever | 2008-03-20 20:50:42 +0100 (Do, 20 M?\195?\164r 2008) | 1 line Made node printing a little bit prettier ........ r61723 | martin.v.loewis | 2008-03-22 00:59:27 +0100 (Sa, 22 M?\195?\164r 2008) | 2 lines Fix whitespace. ........ ................ r61725 | martin.v.loewis | 2008-03-22 01:02:41 +0100 (Sat, 22 Mar 2008) | 2 lines Install lib2to3. ................ r61731 | facundo.batista | 2008-03-22 03:45:37 +0100 (Sat, 22 Mar 2008) | 4 lines Small fix that complicated the test actually when that test failed. ................ r61732 | alexandre.vassalotti | 2008-03-22 05:08:44 +0100 (Sat, 22 Mar 2008) | 2 lines Added warning for the removal of 'hotshot' in Py3k. ................ r61733 | georg.brandl | 2008-03-22 11:07:29 +0100 (Sat, 22 Mar 2008) | 4 lines #1918: document that weak references *to* an object are cleared before the object's __del__ is called, to ensure that the weak reference callback (if any) finds the object healthy. ................ r61734 | georg.brandl | 2008-03-22 11:56:23 +0100 (Sat, 22 Mar 2008) | 2 lines Activate the Sphinx doctest extension and convert howto/functional to use it. ................ r61735 | georg.brandl | 2008-03-22 11:58:38 +0100 (Sat, 22 Mar 2008) | 2 lines Allow giving source names on the cmdline. ................ r61737 | georg.brandl | 2008-03-22 12:00:48 +0100 (Sat, 22 Mar 2008) | 2 lines Fixup this HOWTO's doctest blocks so that they can be run with sphinx' doctest builder. ................ r61739 | georg.brandl | 2008-03-22 12:47:10 +0100 (Sat, 22 Mar 2008) | 2 lines Test decimal.rst doctests as far as possible with sphinx doctest. ................ r61741 | georg.brandl | 2008-03-22 13:04:26 +0100 (Sat, 22 Mar 2008) | 2 lines Make doctests in re docs usable with sphinx' doctest. ................ r61743 | georg.brandl | 2008-03-22 13:59:37 +0100 (Sat, 22 Mar 2008) | 2 lines Make more doctests in pprint docs testable. ................ r61744 | georg.brandl | 2008-03-22 14:07:06 +0100 (Sat, 22 Mar 2008) | 2 lines No need to specify explicit "doctest_block" anymore. ................ r61753 | georg.brandl | 2008-03-22 21:08:43 +0100 (Sat, 22 Mar 2008) | 2 lines Fix-up syntax problems. ................ r61761 | georg.brandl | 2008-03-22 22:06:20 +0100 (Sat, 22 Mar 2008) | 4 lines Make collections' doctests executable. (The <BLANKLINE>s will be stripped from presentation output.) ................ r61765 | georg.brandl | 2008-03-22 22:21:57 +0100 (Sat, 22 Mar 2008) | 2 lines Test doctests in datetime docs. ................ r61766 | georg.brandl | 2008-03-22 22:26:44 +0100 (Sat, 22 Mar 2008) | 2 lines Test doctests in operator docs. ................ r61767 | georg.brandl | 2008-03-22 22:38:33 +0100 (Sat, 22 Mar 2008) | 2 lines Enable doctests in functions.rst. Already found two errors :) ................ r61769 | georg.brandl | 2008-03-22 23:04:10 +0100 (Sat, 22 Mar 2008) | 3 lines Enable doctest running for several other documents. We have now over 640 doctests that are run with "make doctest". ................ r61773 | raymond.hettinger | 2008-03-23 01:55:46 +0100 (Sun, 23 Mar 2008) | 1 line Simplify demo code. ................ r61776 | neal.norwitz | 2008-03-23 04:43:33 +0100 (Sun, 23 Mar 2008) | 7 lines Try to make this test a little more robust and not fail with: timeout (10.0025) is more than 2 seconds more than expected (0.001) I'm assuming this problem is caused by DNS lookup. This change does a DNS lookup of the hostname before trying to connect, so the time is not included. ................ r61777 | neal.norwitz | 2008-03-23 05:08:30 +0100 (Sun, 23 Mar 2008) | 1 line Speed up the test by avoiding socket timeouts. ................ r61778 | neal.norwitz | 2008-03-23 05:43:09 +0100 (Sun, 23 Mar 2008) | 1 line Skip the epoll test if epoll() does not work ................ r61780 | neal.norwitz | 2008-03-23 06:47:20 +0100 (Sun, 23 Mar 2008) | 1 line Suppress failure (to avoid a flaky test) if we cannot connect to svn.python.org ................ r61781 | neal.norwitz | 2008-03-23 07:13:25 +0100 (Sun, 23 Mar 2008) | 4 lines Move itertools before future_builtins since the latter depends on the former. From a clean build importing future_builtins would fail since itertools wasn't built yet. ................ r61782 | neal.norwitz | 2008-03-23 07:16:04 +0100 (Sun, 23 Mar 2008) | 1 line Try to prevent the alarm going off early in tearDown ................ r61783 | neal.norwitz | 2008-03-23 07:19:57 +0100 (Sun, 23 Mar 2008) | 4 lines Remove compiler warnings (on Alpha at least) about using chars as array subscripts. Using chars are dangerous b/c they are signed on some platforms and unsigned on others. ................ r61788 | georg.brandl | 2008-03-23 09:05:30 +0100 (Sun, 23 Mar 2008) | 2 lines Make the doctests presentation-friendlier. ................ r61793 | amaury.forgeotdarc | 2008-03-23 10:55:29 +0100 (Sun, 23 Mar 2008) | 4 lines #1477: ur'\U0010FFFF' raised in narrow unicode builds. Corrected the raw-unicode-escape codec to use UTF-16 surrogates in this case, just like the unicode-escape codec. ................ r61796 | raymond.hettinger | 2008-03-23 14:32:32 +0100 (Sun, 23 Mar 2008) | 1 line Issue 1681432: Add triangular distribution the random module. ................ r61807 | raymond.hettinger | 2008-03-23 20:37:53 +0100 (Sun, 23 Mar 2008) | 4 lines Adopt Nick's suggestion for useful default arguments. Clean-up floating point issues by adding true division and float constants. ................ r61813 | gregory.p.smith | 2008-03-23 22:04:43 +0100 (Sun, 23 Mar 2008) | 6 lines Fix gzip to deal with CRC's being signed values in Python 2.x properly and to read 32bit values as unsigned to start with rather than applying signedness fixups allover the place afterwards. This hopefully fixes the test_tarfile failure on the alpha/tru64 buildbot. ................
2008-03-23 18:54:12 -03:00
More condensed:
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>>> hashlib.sha256(b"Nobody inspects the spammish repetition").hexdigest()
'031edd7d41651593c5fe5c006fa5752b37fddff7bc4e843aa6af0c950f4b9406'
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.. function:: new(name[, data], *, usedforsecurity=True)
Is a generic constructor that takes the string *name* of the desired
algorithm as its first parameter. It 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 :func:`new`
and should be preferred.
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Merged revisions 61724-61725,61731-61735,61737,61739,61741,61743-61744,61753,61761,61765-61767,61769,61773,61776-61778,61780-61783,61788,61793,61796,61807,61813 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ................ r61724 | martin.v.loewis | 2008-03-22 01:01:12 +0100 (Sat, 22 Mar 2008) | 49 lines Merged revisions 61602-61723 via svnmerge from svn+ssh://pythondev@svn.python.org/sandbox/trunk/2to3/lib2to3 ........ r61626 | david.wolever | 2008-03-19 17:19:16 +0100 (Mi, 19 M?\195?\164r 2008) | 1 line Added fixer for implicit local imports. See #2414. ........ r61628 | david.wolever | 2008-03-19 17:57:43 +0100 (Mi, 19 M?\195?\164r 2008) | 1 line Added a class for tests which should not run if a particular import is found. ........ r61629 | collin.winter | 2008-03-19 17:58:19 +0100 (Mi, 19 M?\195?\164r 2008) | 1 line Two more relative import fixes in pgen2. ........ r61635 | david.wolever | 2008-03-19 20:16:03 +0100 (Mi, 19 M?\195?\164r 2008) | 1 line Fixed print fixer so it will do the Right Thing when it encounters __future__.print_function. 2to3 gets upset, though, so the tests have been commented out. ........ r61637 | david.wolever | 2008-03-19 21:37:17 +0100 (Mi, 19 M?\195?\164r 2008) | 3 lines Added a fixer for itertools imports (from itertools import imap, ifilterfalse --> from itertools import filterfalse) ........ r61645 | david.wolever | 2008-03-19 23:22:35 +0100 (Mi, 19 M?\195?\164r 2008) | 1 line SVN is happier when you add the files you create... -_-' ........ r61654 | david.wolever | 2008-03-20 01:09:56 +0100 (Do, 20 M?\195?\164r 2008) | 1 line Added an explicit sort order to fixers -- fixes problems like #2427 ........ r61664 | david.wolever | 2008-03-20 04:32:40 +0100 (Do, 20 M?\195?\164r 2008) | 3 lines Fixes #2428 -- comments are no longer eatten by __future__ fixer. ........ r61673 | david.wolever | 2008-03-20 17:22:40 +0100 (Do, 20 M?\195?\164r 2008) | 1 line Added 2to3 node pretty-printer ........ r61679 | david.wolever | 2008-03-20 20:50:42 +0100 (Do, 20 M?\195?\164r 2008) | 1 line Made node printing a little bit prettier ........ r61723 | martin.v.loewis | 2008-03-22 00:59:27 +0100 (Sa, 22 M?\195?\164r 2008) | 2 lines Fix whitespace. ........ ................ r61725 | martin.v.loewis | 2008-03-22 01:02:41 +0100 (Sat, 22 Mar 2008) | 2 lines Install lib2to3. ................ r61731 | facundo.batista | 2008-03-22 03:45:37 +0100 (Sat, 22 Mar 2008) | 4 lines Small fix that complicated the test actually when that test failed. ................ r61732 | alexandre.vassalotti | 2008-03-22 05:08:44 +0100 (Sat, 22 Mar 2008) | 2 lines Added warning for the removal of 'hotshot' in Py3k. ................ r61733 | georg.brandl | 2008-03-22 11:07:29 +0100 (Sat, 22 Mar 2008) | 4 lines #1918: document that weak references *to* an object are cleared before the object's __del__ is called, to ensure that the weak reference callback (if any) finds the object healthy. ................ r61734 | georg.brandl | 2008-03-22 11:56:23 +0100 (Sat, 22 Mar 2008) | 2 lines Activate the Sphinx doctest extension and convert howto/functional to use it. ................ r61735 | georg.brandl | 2008-03-22 11:58:38 +0100 (Sat, 22 Mar 2008) | 2 lines Allow giving source names on the cmdline. ................ r61737 | georg.brandl | 2008-03-22 12:00:48 +0100 (Sat, 22 Mar 2008) | 2 lines Fixup this HOWTO's doctest blocks so that they can be run with sphinx' doctest builder. ................ r61739 | georg.brandl | 2008-03-22 12:47:10 +0100 (Sat, 22 Mar 2008) | 2 lines Test decimal.rst doctests as far as possible with sphinx doctest. ................ r61741 | georg.brandl | 2008-03-22 13:04:26 +0100 (Sat, 22 Mar 2008) | 2 lines Make doctests in re docs usable with sphinx' doctest. ................ r61743 | georg.brandl | 2008-03-22 13:59:37 +0100 (Sat, 22 Mar 2008) | 2 lines Make more doctests in pprint docs testable. ................ r61744 | georg.brandl | 2008-03-22 14:07:06 +0100 (Sat, 22 Mar 2008) | 2 lines No need to specify explicit "doctest_block" anymore. ................ r61753 | georg.brandl | 2008-03-22 21:08:43 +0100 (Sat, 22 Mar 2008) | 2 lines Fix-up syntax problems. ................ r61761 | georg.brandl | 2008-03-22 22:06:20 +0100 (Sat, 22 Mar 2008) | 4 lines Make collections' doctests executable. (The <BLANKLINE>s will be stripped from presentation output.) ................ r61765 | georg.brandl | 2008-03-22 22:21:57 +0100 (Sat, 22 Mar 2008) | 2 lines Test doctests in datetime docs. ................ r61766 | georg.brandl | 2008-03-22 22:26:44 +0100 (Sat, 22 Mar 2008) | 2 lines Test doctests in operator docs. ................ r61767 | georg.brandl | 2008-03-22 22:38:33 +0100 (Sat, 22 Mar 2008) | 2 lines Enable doctests in functions.rst. Already found two errors :) ................ r61769 | georg.brandl | 2008-03-22 23:04:10 +0100 (Sat, 22 Mar 2008) | 3 lines Enable doctest running for several other documents. We have now over 640 doctests that are run with "make doctest". ................ r61773 | raymond.hettinger | 2008-03-23 01:55:46 +0100 (Sun, 23 Mar 2008) | 1 line Simplify demo code. ................ r61776 | neal.norwitz | 2008-03-23 04:43:33 +0100 (Sun, 23 Mar 2008) | 7 lines Try to make this test a little more robust and not fail with: timeout (10.0025) is more than 2 seconds more than expected (0.001) I'm assuming this problem is caused by DNS lookup. This change does a DNS lookup of the hostname before trying to connect, so the time is not included. ................ r61777 | neal.norwitz | 2008-03-23 05:08:30 +0100 (Sun, 23 Mar 2008) | 1 line Speed up the test by avoiding socket timeouts. ................ r61778 | neal.norwitz | 2008-03-23 05:43:09 +0100 (Sun, 23 Mar 2008) | 1 line Skip the epoll test if epoll() does not work ................ r61780 | neal.norwitz | 2008-03-23 06:47:20 +0100 (Sun, 23 Mar 2008) | 1 line Suppress failure (to avoid a flaky test) if we cannot connect to svn.python.org ................ r61781 | neal.norwitz | 2008-03-23 07:13:25 +0100 (Sun, 23 Mar 2008) | 4 lines Move itertools before future_builtins since the latter depends on the former. From a clean build importing future_builtins would fail since itertools wasn't built yet. ................ r61782 | neal.norwitz | 2008-03-23 07:16:04 +0100 (Sun, 23 Mar 2008) | 1 line Try to prevent the alarm going off early in tearDown ................ r61783 | neal.norwitz | 2008-03-23 07:19:57 +0100 (Sun, 23 Mar 2008) | 4 lines Remove compiler warnings (on Alpha at least) about using chars as array subscripts. Using chars are dangerous b/c they are signed on some platforms and unsigned on others. ................ r61788 | georg.brandl | 2008-03-23 09:05:30 +0100 (Sun, 23 Mar 2008) | 2 lines Make the doctests presentation-friendlier. ................ r61793 | amaury.forgeotdarc | 2008-03-23 10:55:29 +0100 (Sun, 23 Mar 2008) | 4 lines #1477: ur'\U0010FFFF' raised in narrow unicode builds. Corrected the raw-unicode-escape codec to use UTF-16 surrogates in this case, just like the unicode-escape codec. ................ r61796 | raymond.hettinger | 2008-03-23 14:32:32 +0100 (Sun, 23 Mar 2008) | 1 line Issue 1681432: Add triangular distribution the random module. ................ r61807 | raymond.hettinger | 2008-03-23 20:37:53 +0100 (Sun, 23 Mar 2008) | 4 lines Adopt Nick's suggestion for useful default arguments. Clean-up floating point issues by adding true division and float constants. ................ r61813 | gregory.p.smith | 2008-03-23 22:04:43 +0100 (Sun, 23 Mar 2008) | 6 lines Fix gzip to deal with CRC's being signed values in Python 2.x properly and to read 32bit values as unsigned to start with rather than applying signedness fixups allover the place afterwards. This hopefully fixes the test_tarfile failure on the alpha/tru64 buildbot. ................
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Using :func:`new` with an algorithm provided by OpenSSL:
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>>> h = hashlib.new('sha256')
>>> h.update(b"Nobody inspects the spammish repetition")
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>>> h.hexdigest()
'031edd7d41651593c5fe5c006fa5752b37fddff7bc4e843aa6af0c950f4b9406'
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Hashlib provides the following constant attributes:
.. data:: algorithms_guaranteed
A set containing the names of the hash algorithms guaranteed to be supported
by this module on all platforms. Note that 'md5' is in this list despite
some upstream vendors offering an odd "FIPS compliant" Python build that
excludes it.
.. versionadded:: 3.2
.. data:: algorithms_available
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
:func:`new`. :attr:`algorithms_guaranteed` will always be a subset. The
same algorithm may appear multiple times in this set under different names
(thanks to OpenSSL).
.. versionadded:: 3.2
2007-08-15 11:28:22 -03:00
The following values are provided as constant attributes of the hash objects
returned by the constructors:
Merged revisions 74779-74786,74793,74795,74811,74860-74861,74863,74876,74886,74896,74901,74903,74908,74912,74930,74933,74943,74946,74952-74955,75015,75019,75032,75068,75076,75095,75098,75102,75129,75139,75230 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r74779 | michael.foord | 2009-09-13 11:13:36 -0500 (Sun, 13 Sep 2009) | 1 line Change to tutorial wording for reading text / binary files on Windows. Issue #6301. ........ r74780 | michael.foord | 2009-09-13 11:40:02 -0500 (Sun, 13 Sep 2009) | 1 line Objects that compare equal automatically pass or fail assertAlmostEqual and assertNotAlmostEqual tests on unittest.TestCase. Issue 6567. ........ r74781 | michael.foord | 2009-09-13 11:46:19 -0500 (Sun, 13 Sep 2009) | 1 line Note that sys._getframe is not guaranteed to exist in all implementations of Python, and a corresponding note in inspect.currentframe. Issue 6712. ........ r74782 | michael.foord | 2009-09-13 12:07:46 -0500 (Sun, 13 Sep 2009) | 1 line Tutorial tweaks. Issue 6849. ........ r74783 | michael.foord | 2009-09-13 12:28:35 -0500 (Sun, 13 Sep 2009) | 1 line unittest.TestLoader.loadTestsFromName honors the loader suiteClass attribute. Issue 6866. ........ r74784 | georg.brandl | 2009-09-13 13:15:07 -0500 (Sun, 13 Sep 2009) | 1 line Typo fix. ........ r74785 | michael.foord | 2009-09-13 14:07:03 -0500 (Sun, 13 Sep 2009) | 1 line Test discovery in unittest will only attempt to import modules that are importable; i.e. their names are valid Python identifiers. If an import fails during discovery this will be recorded as an error and test discovery will continue. Issue 6568. ........ r74786 | michael.foord | 2009-09-13 14:08:18 -0500 (Sun, 13 Sep 2009) | 1 line Remove an extraneous space in unittest documentation. ........ r74793 | georg.brandl | 2009-09-14 09:50:47 -0500 (Mon, 14 Sep 2009) | 1 line #6908: fix association of hashlib hash attributes. ........ r74795 | benjamin.peterson | 2009-09-14 22:36:26 -0500 (Mon, 14 Sep 2009) | 1 line Py_SetPythonHome uses static storage #6913 ........ r74811 | georg.brandl | 2009-09-15 15:26:59 -0500 (Tue, 15 Sep 2009) | 1 line Add Armin Ronacher. ........ r74860 | benjamin.peterson | 2009-09-16 21:46:54 -0500 (Wed, 16 Sep 2009) | 1 line kill bare except ........ r74861 | benjamin.peterson | 2009-09-16 22:18:28 -0500 (Wed, 16 Sep 2009) | 1 line pep 8 defaults ........ r74863 | benjamin.peterson | 2009-09-16 22:27:33 -0500 (Wed, 16 Sep 2009) | 1 line rationalize a bit ........ r74876 | georg.brandl | 2009-09-17 11:15:53 -0500 (Thu, 17 Sep 2009) | 1 line #6932: remove paragraph that advises relying on __del__ being called. ........ r74886 | benjamin.peterson | 2009-09-17 16:33:46 -0500 (Thu, 17 Sep 2009) | 1 line use macros ........ r74896 | georg.brandl | 2009-09-18 02:22:41 -0500 (Fri, 18 Sep 2009) | 1 line #6936: for interactive use, quit() is just fine. ........ r74901 | georg.brandl | 2009-09-18 04:14:52 -0500 (Fri, 18 Sep 2009) | 1 line #6905: use better exception messages in inspect when the argument is of the wrong type. ........ r74903 | georg.brandl | 2009-09-18 04:18:27 -0500 (Fri, 18 Sep 2009) | 1 line #6938: "ident" is always a string, so use a format code which works. ........ r74908 | georg.brandl | 2009-09-18 08:57:11 -0500 (Fri, 18 Sep 2009) | 1 line Use str.format() to fix beginner's mistake with %-style string formatting. ........ r74912 | georg.brandl | 2009-09-18 11:19:56 -0500 (Fri, 18 Sep 2009) | 1 line Optimize optimization and fix method name in docstring. ........ r74930 | georg.brandl | 2009-09-18 16:21:41 -0500 (Fri, 18 Sep 2009) | 1 line #6925: rewrite docs for locals() and vars() a bit. ........ r74933 | georg.brandl | 2009-09-18 16:35:59 -0500 (Fri, 18 Sep 2009) | 1 line #6930: clarify description about byteorder handling in UTF decoder routines. ........ r74943 | georg.brandl | 2009-09-19 02:35:07 -0500 (Sat, 19 Sep 2009) | 1 line #6944: the argument to PyArg_ParseTuple should be a tuple, otherwise a SystemError is set. Also clean up another usage of PyArg_ParseTuple. ........ r74946 | georg.brandl | 2009-09-19 03:43:16 -0500 (Sat, 19 Sep 2009) | 1 line Update bug tracker reference. ........ r74952 | georg.brandl | 2009-09-19 05:42:34 -0500 (Sat, 19 Sep 2009) | 1 line #6946: fix duplicate index entries for datetime classes. ........ r74953 | georg.brandl | 2009-09-19 07:04:16 -0500 (Sat, 19 Sep 2009) | 1 line Fix references to threading.enumerate(). ........ r74954 | georg.brandl | 2009-09-19 08:13:56 -0500 (Sat, 19 Sep 2009) | 1 line Add Doug. ........ r74955 | georg.brandl | 2009-09-19 08:20:49 -0500 (Sat, 19 Sep 2009) | 1 line Add Mark Summerfield. ........ r75015 | georg.brandl | 2009-09-22 05:55:08 -0500 (Tue, 22 Sep 2009) | 1 line Fix encoding name. ........ r75019 | vinay.sajip | 2009-09-22 12:23:41 -0500 (Tue, 22 Sep 2009) | 1 line Fixed a typo, and added sections on optimization and using arbitrary objects as messages. ........ r75032 | benjamin.peterson | 2009-09-22 17:15:28 -0500 (Tue, 22 Sep 2009) | 1 line fix typos/rephrase ........ r75068 | benjamin.peterson | 2009-09-25 21:57:59 -0500 (Fri, 25 Sep 2009) | 1 line comment out ugly xxx ........ r75076 | vinay.sajip | 2009-09-26 09:53:32 -0500 (Sat, 26 Sep 2009) | 1 line Tidied up name of parameter in StreamHandler ........ r75095 | michael.foord | 2009-09-27 14:15:41 -0500 (Sun, 27 Sep 2009) | 1 line Test creation moved from TestProgram.parseArgs to TestProgram.createTests exclusively. Issue 6956. ........ r75098 | michael.foord | 2009-09-27 15:08:23 -0500 (Sun, 27 Sep 2009) | 1 line Documentation improvement for load_tests protocol in unittest. Issue 6515. ........ r75102 | skip.montanaro | 2009-09-27 21:12:27 -0500 (Sun, 27 Sep 2009) | 3 lines Patch from Thomas Barr so that csv.Sniffer will set doublequote property. Closes issue 6606. ........ r75129 | vinay.sajip | 2009-09-29 02:08:54 -0500 (Tue, 29 Sep 2009) | 1 line Issue #7014: logging: Improved IronPython 2.6 compatibility. ........ r75139 | raymond.hettinger | 2009-09-29 13:53:24 -0500 (Tue, 29 Sep 2009) | 3 lines Issue 7008: Better document str.title and show how to work around the apostrophe problem. ........ r75230 | benjamin.peterson | 2009-10-04 08:38:38 -0500 (Sun, 04 Oct 2009) | 1 line test logging ........
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.. data:: hash.digest_size
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The size of the resulting hash in bytes.
Merged revisions 74779-74786,74793,74795,74811,74860-74861,74863,74876,74886,74896,74901,74903,74908,74912,74930,74933,74943,74946,74952-74955,75015,75019,75032,75068,75076,75095,75098,75102,75129,75139,75230 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r74779 | michael.foord | 2009-09-13 11:13:36 -0500 (Sun, 13 Sep 2009) | 1 line Change to tutorial wording for reading text / binary files on Windows. Issue #6301. ........ r74780 | michael.foord | 2009-09-13 11:40:02 -0500 (Sun, 13 Sep 2009) | 1 line Objects that compare equal automatically pass or fail assertAlmostEqual and assertNotAlmostEqual tests on unittest.TestCase. Issue 6567. ........ r74781 | michael.foord | 2009-09-13 11:46:19 -0500 (Sun, 13 Sep 2009) | 1 line Note that sys._getframe is not guaranteed to exist in all implementations of Python, and a corresponding note in inspect.currentframe. Issue 6712. ........ r74782 | michael.foord | 2009-09-13 12:07:46 -0500 (Sun, 13 Sep 2009) | 1 line Tutorial tweaks. Issue 6849. ........ r74783 | michael.foord | 2009-09-13 12:28:35 -0500 (Sun, 13 Sep 2009) | 1 line unittest.TestLoader.loadTestsFromName honors the loader suiteClass attribute. Issue 6866. ........ r74784 | georg.brandl | 2009-09-13 13:15:07 -0500 (Sun, 13 Sep 2009) | 1 line Typo fix. ........ r74785 | michael.foord | 2009-09-13 14:07:03 -0500 (Sun, 13 Sep 2009) | 1 line Test discovery in unittest will only attempt to import modules that are importable; i.e. their names are valid Python identifiers. If an import fails during discovery this will be recorded as an error and test discovery will continue. Issue 6568. ........ r74786 | michael.foord | 2009-09-13 14:08:18 -0500 (Sun, 13 Sep 2009) | 1 line Remove an extraneous space in unittest documentation. ........ r74793 | georg.brandl | 2009-09-14 09:50:47 -0500 (Mon, 14 Sep 2009) | 1 line #6908: fix association of hashlib hash attributes. ........ r74795 | benjamin.peterson | 2009-09-14 22:36:26 -0500 (Mon, 14 Sep 2009) | 1 line Py_SetPythonHome uses static storage #6913 ........ r74811 | georg.brandl | 2009-09-15 15:26:59 -0500 (Tue, 15 Sep 2009) | 1 line Add Armin Ronacher. ........ r74860 | benjamin.peterson | 2009-09-16 21:46:54 -0500 (Wed, 16 Sep 2009) | 1 line kill bare except ........ r74861 | benjamin.peterson | 2009-09-16 22:18:28 -0500 (Wed, 16 Sep 2009) | 1 line pep 8 defaults ........ r74863 | benjamin.peterson | 2009-09-16 22:27:33 -0500 (Wed, 16 Sep 2009) | 1 line rationalize a bit ........ r74876 | georg.brandl | 2009-09-17 11:15:53 -0500 (Thu, 17 Sep 2009) | 1 line #6932: remove paragraph that advises relying on __del__ being called. ........ r74886 | benjamin.peterson | 2009-09-17 16:33:46 -0500 (Thu, 17 Sep 2009) | 1 line use macros ........ r74896 | georg.brandl | 2009-09-18 02:22:41 -0500 (Fri, 18 Sep 2009) | 1 line #6936: for interactive use, quit() is just fine. ........ r74901 | georg.brandl | 2009-09-18 04:14:52 -0500 (Fri, 18 Sep 2009) | 1 line #6905: use better exception messages in inspect when the argument is of the wrong type. ........ r74903 | georg.brandl | 2009-09-18 04:18:27 -0500 (Fri, 18 Sep 2009) | 1 line #6938: "ident" is always a string, so use a format code which works. ........ r74908 | georg.brandl | 2009-09-18 08:57:11 -0500 (Fri, 18 Sep 2009) | 1 line Use str.format() to fix beginner's mistake with %-style string formatting. ........ r74912 | georg.brandl | 2009-09-18 11:19:56 -0500 (Fri, 18 Sep 2009) | 1 line Optimize optimization and fix method name in docstring. ........ r74930 | georg.brandl | 2009-09-18 16:21:41 -0500 (Fri, 18 Sep 2009) | 1 line #6925: rewrite docs for locals() and vars() a bit. ........ r74933 | georg.brandl | 2009-09-18 16:35:59 -0500 (Fri, 18 Sep 2009) | 1 line #6930: clarify description about byteorder handling in UTF decoder routines. ........ r74943 | georg.brandl | 2009-09-19 02:35:07 -0500 (Sat, 19 Sep 2009) | 1 line #6944: the argument to PyArg_ParseTuple should be a tuple, otherwise a SystemError is set. Also clean up another usage of PyArg_ParseTuple. ........ r74946 | georg.brandl | 2009-09-19 03:43:16 -0500 (Sat, 19 Sep 2009) | 1 line Update bug tracker reference. ........ r74952 | georg.brandl | 2009-09-19 05:42:34 -0500 (Sat, 19 Sep 2009) | 1 line #6946: fix duplicate index entries for datetime classes. ........ r74953 | georg.brandl | 2009-09-19 07:04:16 -0500 (Sat, 19 Sep 2009) | 1 line Fix references to threading.enumerate(). ........ r74954 | georg.brandl | 2009-09-19 08:13:56 -0500 (Sat, 19 Sep 2009) | 1 line Add Doug. ........ r74955 | georg.brandl | 2009-09-19 08:20:49 -0500 (Sat, 19 Sep 2009) | 1 line Add Mark Summerfield. ........ r75015 | georg.brandl | 2009-09-22 05:55:08 -0500 (Tue, 22 Sep 2009) | 1 line Fix encoding name. ........ r75019 | vinay.sajip | 2009-09-22 12:23:41 -0500 (Tue, 22 Sep 2009) | 1 line Fixed a typo, and added sections on optimization and using arbitrary objects as messages. ........ r75032 | benjamin.peterson | 2009-09-22 17:15:28 -0500 (Tue, 22 Sep 2009) | 1 line fix typos/rephrase ........ r75068 | benjamin.peterson | 2009-09-25 21:57:59 -0500 (Fri, 25 Sep 2009) | 1 line comment out ugly xxx ........ r75076 | vinay.sajip | 2009-09-26 09:53:32 -0500 (Sat, 26 Sep 2009) | 1 line Tidied up name of parameter in StreamHandler ........ r75095 | michael.foord | 2009-09-27 14:15:41 -0500 (Sun, 27 Sep 2009) | 1 line Test creation moved from TestProgram.parseArgs to TestProgram.createTests exclusively. Issue 6956. ........ r75098 | michael.foord | 2009-09-27 15:08:23 -0500 (Sun, 27 Sep 2009) | 1 line Documentation improvement for load_tests protocol in unittest. Issue 6515. ........ r75102 | skip.montanaro | 2009-09-27 21:12:27 -0500 (Sun, 27 Sep 2009) | 3 lines Patch from Thomas Barr so that csv.Sniffer will set doublequote property. Closes issue 6606. ........ r75129 | vinay.sajip | 2009-09-29 02:08:54 -0500 (Tue, 29 Sep 2009) | 1 line Issue #7014: logging: Improved IronPython 2.6 compatibility. ........ r75139 | raymond.hettinger | 2009-09-29 13:53:24 -0500 (Tue, 29 Sep 2009) | 3 lines Issue 7008: Better document str.title and show how to work around the apostrophe problem. ........ r75230 | benjamin.peterson | 2009-10-04 08:38:38 -0500 (Sun, 04 Oct 2009) | 1 line test logging ........
2009-10-04 11:49:41 -03:00
.. data:: hash.block_size
The internal block size of the hash algorithm in bytes.
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A hash object has the following attributes:
.. attribute:: hash.name
The canonical name of this hash, always lowercase and always suitable as a
parameter to :func:`new` to create another hash of this type.
.. versionchanged:: 3.4
The name attribute has been present in CPython since its inception, but
until Python 3.4 was not formally specified, so may not exist on some
platforms.
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A hash object has the following methods:
.. method:: hash.update(data)
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Update the hash object with the :term:`bytes-like object`.
Repeated calls are equivalent to a single call with the
concatenation of all the arguments: ``m.update(a); m.update(b)`` is
equivalent to ``m.update(a+b)``.
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2009-05-05 06:29:50 -03:00
.. versionchanged:: 3.1
The Python GIL is released to allow other threads to run while hash
updates on data larger than 2047 bytes is taking place when using hash
algorithms supplied by OpenSSL.
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.. method:: hash.digest()
Return the digest of the data passed to the :meth:`update` method so far.
This is a bytes object of size :attr:`digest_size` which may contain bytes in
the whole range from 0 to 255.
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.. method:: hash.hexdigest()
Like :meth:`digest` except the digest is returned as a string object of
double length, containing only hexadecimal digits. This may be used to
exchange the value safely in email or other non-binary environments.
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.. method:: hash.copy()
Return a copy ("clone") of the hash object. This can be used to efficiently
compute the digests of data sharing a common initial substring.
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SHAKE variable length digests
-----------------------------
The :func:`shake_128` and :func:`shake_256` algorithms provide variable
length digests with length_in_bits//2 up to 128 or 256 bits of security.
As such, their digest methods require a length. Maximum length is not limited
by the SHAKE algorithm.
.. method:: shake.digest(length)
Return the digest of the data passed to the :meth:`update` method so far.
This is a bytes object of size *length* which may contain bytes in
the whole range from 0 to 255.
.. method:: shake.hexdigest(length)
Like :meth:`digest` except the digest is returned as a string object of
double length, containing only hexadecimal digits. This may be used to
exchange the value safely in email or other non-binary environments.
File hashing
------------
The hashlib module provides a helper function for efficient hashing of
a file or file-like object.
.. function:: file_digest(fileobj, digest, /)
Return a digest object that has been updated with contents of file object.
*fileobj* must be a file-like object opened for reading in binary mode.
It accepts file objects from builtin :func:`open`, :class:`~io.BytesIO`
instances, SocketIO objects from :meth:`socket.socket.makefile`, and
similar. The function may bypass Python's I/O and use the file descriptor
from :meth:`~io.IOBase.fileno` directly. *fileobj* must be assumed to be
in an unknown state after this function returns or raises. It is up to
the caller to close *fileobj*.
*digest* must either be a hash algorithm name as a *str*, a hash
constructor, or a callable that returns a hash object.
Example:
>>> import io, hashlib, hmac
>>> with open(hashlib.__file__, "rb") as f:
... digest = hashlib.file_digest(f, "sha256")
...
>>> digest.hexdigest() # doctest: +ELLIPSIS
'...'
>>> buf = io.BytesIO(b"somedata")
>>> mac1 = hmac.HMAC(b"key", digestmod=hashlib.sha512)
>>> digest = hashlib.file_digest(buf, lambda: mac1)
>>> digest is mac1
True
>>> mac2 = hmac.HMAC(b"key", b"somedata", digestmod=hashlib.sha512)
>>> mac1.digest() == mac2.digest()
True
.. versionadded:: 3.11
2015-09-27 05:23:10 -03:00
Key derivation
--------------
Key derivation and key stretching algorithms are designed for secure password
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hashing. Naive algorithms such as ``sha1(password)`` are not resistant against
brute-force attacks. A good password hashing function must be tunable, slow, and
include a `salt <https://en.wikipedia.org/wiki/Salt_%28cryptography%29>`_.
.. function:: pbkdf2_hmac(hash_name, password, salt, iterations, dklen=None)
The function provides PKCS#5 password-based key derivation function 2. It
uses HMAC as pseudorandom function.
The string *hash_name* is the desired name of the hash digest algorithm for
HMAC, e.g. 'sha1' or 'sha256'. *password* and *salt* are interpreted as
buffers of bytes. Applications and libraries should limit *password* to
a sensible length (e.g. 1024). *salt* should be about 16 or more bytes from
a proper source, e.g. :func:`os.urandom`.
The number of *iterations* should be chosen based on the hash algorithm and
computing power. As of 2022, hundreds of thousands of iterations of SHA-256
are suggested. For rationale as to why and how to choose what is best for
your application, read *Appendix A.2.2* of NIST-SP-800-132_. The answers
on the `stackexchange pbkdf2 iterations question`_ explain in detail.
*dklen* is the length of the derived key. If *dklen* is ``None`` then the
digest size of the hash algorithm *hash_name* is used, e.g. 64 for SHA-512.
>>> from hashlib import pbkdf2_hmac
>>> our_app_iters = 500_000 # Application specific, read above.
>>> dk = pbkdf2_hmac('sha256', b'password', b'bad salt' * 2, our_app_iters)
>>> dk.hex()
'15530bba69924174860db778f2c6f8104d3aaf9d26241840c8c4a641c8d000a9'
Function only available when Python is compiled with OpenSSL.
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.. versionadded:: 3.4
.. versionchanged:: 3.12
Function now only available when Python is built with OpenSSL. The slow
pure Python implementation has been removed.
.. function:: scrypt(password, *, salt, n, r, p, maxmem=0, dklen=64)
The function provides scrypt password-based key derivation function as
defined in :rfc:`7914`.
*password* and *salt* must be :term:`bytes-like objects
<bytes-like object>`. Applications and libraries should limit *password*
to a sensible length (e.g. 1024). *salt* should be about 16 or more
bytes from a proper source, e.g. :func:`os.urandom`.
*n* is the CPU/Memory cost factor, *r* the block size, *p* parallelization
factor and *maxmem* limits memory (OpenSSL 1.1.0 defaults to 32 MiB).
*dklen* is the length of the derived key.
.. versionadded:: 3.6
BLAKE2
------
.. sectionauthor:: Dmitry Chestnykh
.. index::
single: blake2b, blake2s
BLAKE2_ is a cryptographic hash function defined in :rfc:`7693` that comes in two
flavors:
* **BLAKE2b**, optimized for 64-bit platforms and produces digests of any size
between 1 and 64 bytes,
* **BLAKE2s**, optimized for 8- to 32-bit platforms and produces digests of any
size between 1 and 32 bytes.
BLAKE2 supports **keyed mode** (a faster and simpler replacement for HMAC_),
**salted hashing**, **personalization**, and **tree hashing**.
Hash objects from this module follow the API of standard library's
:mod:`hashlib` objects.
Creating hash objects
^^^^^^^^^^^^^^^^^^^^^
New hash objects are created by calling constructor functions:
.. function:: blake2b(data=b'', *, digest_size=64, key=b'', salt=b'', \
person=b'', fanout=1, depth=1, leaf_size=0, node_offset=0, \
node_depth=0, inner_size=0, last_node=False, \
usedforsecurity=True)
.. function:: blake2s(data=b'', *, digest_size=32, key=b'', salt=b'', \
person=b'', fanout=1, depth=1, leaf_size=0, node_offset=0, \
node_depth=0, inner_size=0, last_node=False, \
usedforsecurity=True)
These functions return the corresponding hash objects for calculating
BLAKE2b or BLAKE2s. They optionally take these general parameters:
* *data*: initial chunk of data to hash, which must be
:term:`bytes-like object`. It can be passed only as positional argument.
* *digest_size*: size of output digest in bytes.
* *key*: key for keyed hashing (up to 64 bytes for BLAKE2b, up to 32 bytes for
BLAKE2s).
* *salt*: salt for randomized hashing (up to 16 bytes for BLAKE2b, up to 8
bytes for BLAKE2s).
* *person*: personalization string (up to 16 bytes for BLAKE2b, up to 8 bytes
for BLAKE2s).
The following table shows limits for general parameters (in bytes):
======= =========== ======== ========= ===========
Hash digest_size len(key) len(salt) len(person)
======= =========== ======== ========= ===========
BLAKE2b 64 64 16 16
BLAKE2s 32 32 8 8
======= =========== ======== ========= ===========
.. note::
BLAKE2 specification defines constant lengths for salt and personalization
parameters, however, for convenience, this implementation accepts byte
strings of any size up to the specified length. If the length of the
parameter is less than specified, it is padded with zeros, thus, for
example, ``b'salt'`` and ``b'salt\x00'`` is the same value. (This is not
the case for *key*.)
These sizes are available as module `constants`_ described below.
Constructor functions also accept the following tree hashing parameters:
* *fanout*: fanout (0 to 255, 0 if unlimited, 1 in sequential mode).
* *depth*: maximal depth of tree (1 to 255, 255 if unlimited, 1 in
sequential mode).
* *leaf_size*: maximal byte length of leaf (0 to ``2**32-1``, 0 if unlimited or in
sequential mode).
* *node_offset*: node offset (0 to ``2**64-1`` for BLAKE2b, 0 to ``2**48-1`` for
BLAKE2s, 0 for the first, leftmost, leaf, or in sequential mode).
* *node_depth*: node depth (0 to 255, 0 for leaves, or in sequential mode).
* *inner_size*: inner digest size (0 to 64 for BLAKE2b, 0 to 32 for
BLAKE2s, 0 in sequential mode).
* *last_node*: boolean indicating whether the processed node is the last
one (`False` for sequential mode).
.. figure:: hashlib-blake2-tree.png
:alt: Explanation of tree mode parameters.
See section 2.10 in `BLAKE2 specification
<https://blake2.net/blake2_20130129.pdf>`_ for comprehensive review of tree
hashing.
Constants
^^^^^^^^^
.. data:: blake2b.SALT_SIZE
.. data:: blake2s.SALT_SIZE
Salt length (maximum length accepted by constructors).
.. data:: blake2b.PERSON_SIZE
.. data:: blake2s.PERSON_SIZE
Personalization string length (maximum length accepted by constructors).
.. data:: blake2b.MAX_KEY_SIZE
.. data:: blake2s.MAX_KEY_SIZE
Maximum key size.
.. data:: blake2b.MAX_DIGEST_SIZE
.. data:: blake2s.MAX_DIGEST_SIZE
Maximum digest size that the hash function can output.
Examples
^^^^^^^^
Simple hashing
""""""""""""""
To calculate hash of some data, you should first construct a hash object by
calling the appropriate constructor function (:func:`blake2b` or
:func:`blake2s`), then update it with the data by calling :meth:`update` on the
object, and, finally, get the digest out of the object by calling
:meth:`digest` (or :meth:`hexdigest` for hex-encoded string).
>>> from hashlib import blake2b
>>> h = blake2b()
>>> h.update(b'Hello world')
>>> h.hexdigest()
'6ff843ba685842aa82031d3f53c48b66326df7639a63d128974c5c14f31a0f33343a8c65551134ed1ae0f2b0dd2bb495dc81039e3eeb0aa1bb0388bbeac29183'
As a shortcut, you can pass the first chunk of data to update directly to the
constructor as the positional argument:
>>> from hashlib import blake2b
>>> blake2b(b'Hello world').hexdigest()
'6ff843ba685842aa82031d3f53c48b66326df7639a63d128974c5c14f31a0f33343a8c65551134ed1ae0f2b0dd2bb495dc81039e3eeb0aa1bb0388bbeac29183'
You can call :meth:`hash.update` as many times as you need to iteratively
update the hash:
>>> from hashlib import blake2b
>>> items = [b'Hello', b' ', b'world']
>>> h = blake2b()
>>> for item in items:
... h.update(item)
>>> h.hexdigest()
'6ff843ba685842aa82031d3f53c48b66326df7639a63d128974c5c14f31a0f33343a8c65551134ed1ae0f2b0dd2bb495dc81039e3eeb0aa1bb0388bbeac29183'
Using different digest sizes
""""""""""""""""""""""""""""
BLAKE2 has configurable size of digests up to 64 bytes for BLAKE2b and up to 32
bytes for BLAKE2s. For example, to replace SHA-1 with BLAKE2b without changing
the size of output, we can tell BLAKE2b to produce 20-byte digests:
>>> from hashlib import blake2b
>>> h = blake2b(digest_size=20)
>>> h.update(b'Replacing SHA1 with the more secure function')
>>> h.hexdigest()
'd24f26cf8de66472d58d4e1b1774b4c9158b1f4c'
>>> h.digest_size
20
>>> len(h.digest())
20
Hash objects with different digest sizes have completely different outputs
(shorter hashes are *not* prefixes of longer hashes); BLAKE2b and BLAKE2s
produce different outputs even if the output length is the same:
>>> from hashlib import blake2b, blake2s
>>> blake2b(digest_size=10).hexdigest()
'6fa1d8fcfd719046d762'
>>> blake2b(digest_size=11).hexdigest()
'eb6ec15daf9546254f0809'
>>> blake2s(digest_size=10).hexdigest()
'1bf21a98c78a1c376ae9'
>>> blake2s(digest_size=11).hexdigest()
'567004bf96e4a25773ebf4'
Keyed hashing
"""""""""""""
Keyed hashing can be used for authentication as a faster and simpler
replacement for `Hash-based message authentication code
<https://en.wikipedia.org/wiki/HMAC>`_ (HMAC).
BLAKE2 can be securely used in prefix-MAC mode thanks to the
indifferentiability property inherited from BLAKE.
This example shows how to get a (hex-encoded) 128-bit authentication code for
message ``b'message data'`` with key ``b'pseudorandom key'``::
>>> from hashlib import blake2b
>>> h = blake2b(key=b'pseudorandom key', digest_size=16)
>>> h.update(b'message data')
>>> h.hexdigest()
'3d363ff7401e02026f4a4687d4863ced'
As a practical example, a web application can symmetrically sign cookies sent
to users and later verify them to make sure they weren't tampered with::
>>> from hashlib import blake2b
>>> from hmac import compare_digest
>>>
>>> SECRET_KEY = b'pseudorandomly generated server secret key'
>>> AUTH_SIZE = 16
>>>
>>> def sign(cookie):
... h = blake2b(digest_size=AUTH_SIZE, key=SECRET_KEY)
... h.update(cookie)
... return h.hexdigest().encode('utf-8')
>>>
>>> def verify(cookie, sig):
... good_sig = sign(cookie)
... return compare_digest(good_sig, sig)
>>>
>>> cookie = b'user-alice'
>>> sig = sign(cookie)
>>> print("{0},{1}".format(cookie.decode('utf-8'), sig))
user-alice,b'43b3c982cf697e0c5ab22172d1ca7421'
>>> verify(cookie, sig)
True
>>> verify(b'user-bob', sig)
False
>>> verify(cookie, b'0102030405060708090a0b0c0d0e0f00')
False
Even though there's a native keyed hashing mode, BLAKE2 can, of course, be used
in HMAC construction with :mod:`hmac` module::
>>> import hmac, hashlib
>>> m = hmac.new(b'secret key', digestmod=hashlib.blake2s)
>>> m.update(b'message')
>>> m.hexdigest()
'e3c8102868d28b5ff85fc35dda07329970d1a01e273c37481326fe0c861c8142'
Randomized hashing
""""""""""""""""""
By setting *salt* parameter users can introduce randomization to the hash
function. Randomized hashing is useful for protecting against collision attacks
on the hash function used in digital signatures.
Randomized hashing is designed for situations where one party, the message
preparer, generates all or part of a message to be signed by a second
party, the message signer. If the message preparer is able to find
cryptographic hash function collisions (i.e., two messages producing the
same hash value), then they might prepare meaningful versions of the message
that would produce the same hash value and digital signature, but with
different results (e.g., transferring $1,000,000 to an account, rather than
$10). Cryptographic hash functions have been designed with collision
resistance as a major goal, but the current concentration on attacking
cryptographic hash functions may result in a given cryptographic hash
function providing less collision resistance than expected. Randomized
hashing offers the signer additional protection by reducing the likelihood
that a preparer can generate two or more messages that ultimately yield the
same hash value during the digital signature generation process --- even if
it is practical to find collisions for the hash function. However, the use
of randomized hashing may reduce the amount of security provided by a
digital signature when all portions of the message are prepared
by the signer.
(`NIST SP-800-106 "Randomized Hashing for Digital Signatures"
<https://csrc.nist.gov/publications/detail/sp/800-106/final>`_)
In BLAKE2 the salt is processed as a one-time input to the hash function during
initialization, rather than as an input to each compression function.
.. warning::
*Salted hashing* (or just hashing) with BLAKE2 or any other general-purpose
cryptographic hash function, such as SHA-256, is not suitable for hashing
passwords. See `BLAKE2 FAQ <https://blake2.net/#qa>`_ for more
information.
..
>>> import os
>>> from hashlib import blake2b
>>> msg = b'some message'
>>> # Calculate the first hash with a random salt.
>>> salt1 = os.urandom(blake2b.SALT_SIZE)
>>> h1 = blake2b(salt=salt1)
>>> h1.update(msg)
>>> # Calculate the second hash with a different random salt.
>>> salt2 = os.urandom(blake2b.SALT_SIZE)
>>> h2 = blake2b(salt=salt2)
>>> h2.update(msg)
>>> # The digests are different.
>>> h1.digest() != h2.digest()
True
Personalization
"""""""""""""""
Sometimes it is useful to force hash function to produce different digests for
the same input for different purposes. Quoting the authors of the Skein hash
function:
We recommend that all application designers seriously consider doing this;
we have seen many protocols where a hash that is computed in one part of
the protocol can be used in an entirely different part because two hash
computations were done on similar or related data, and the attacker can
force the application to make the hash inputs the same. Personalizing each
hash function used in the protocol summarily stops this type of attack.
(`The Skein Hash Function Family
<https://www.schneier.com/wp-content/uploads/2016/02/skein.pdf>`_,
p. 21)
BLAKE2 can be personalized by passing bytes to the *person* argument::
>>> from hashlib import blake2b
>>> FILES_HASH_PERSON = b'MyApp Files Hash'
>>> BLOCK_HASH_PERSON = b'MyApp Block Hash'
>>> h = blake2b(digest_size=32, person=FILES_HASH_PERSON)
>>> h.update(b'the same content')
>>> h.hexdigest()
'20d9cd024d4fb086aae819a1432dd2466de12947831b75c5a30cf2676095d3b4'
>>> h = blake2b(digest_size=32, person=BLOCK_HASH_PERSON)
>>> h.update(b'the same content')
>>> h.hexdigest()
'cf68fb5761b9c44e7878bfb2c4c9aea52264a80b75005e65619778de59f383a3'
Personalization together with the keyed mode can also be used to derive different
keys from a single one.
>>> from hashlib import blake2s
>>> from base64 import b64decode, b64encode
>>> orig_key = b64decode(b'Rm5EPJai72qcK3RGBpW3vPNfZy5OZothY+kHY6h21KM=')
>>> enc_key = blake2s(key=orig_key, person=b'kEncrypt').digest()
>>> mac_key = blake2s(key=orig_key, person=b'kMAC').digest()
>>> print(b64encode(enc_key).decode('utf-8'))
rbPb15S/Z9t+agffno5wuhB77VbRi6F9Iv2qIxU7WHw=
>>> print(b64encode(mac_key).decode('utf-8'))
G9GtHFE1YluXY1zWPlYk1e/nWfu0WSEb0KRcjhDeP/o=
Tree mode
"""""""""
Here's an example of hashing a minimal tree with two leaf nodes::
10
/ \
00 01
This example uses 64-byte internal digests, and returns the 32-byte final
digest::
>>> from hashlib import blake2b
>>>
>>> FANOUT = 2
>>> DEPTH = 2
>>> LEAF_SIZE = 4096
>>> INNER_SIZE = 64
>>>
>>> buf = bytearray(6000)
>>>
>>> # Left leaf
... h00 = blake2b(buf[0:LEAF_SIZE], fanout=FANOUT, depth=DEPTH,
... leaf_size=LEAF_SIZE, inner_size=INNER_SIZE,
... node_offset=0, node_depth=0, last_node=False)
>>> # Right leaf
... h01 = blake2b(buf[LEAF_SIZE:], fanout=FANOUT, depth=DEPTH,
... leaf_size=LEAF_SIZE, inner_size=INNER_SIZE,
... node_offset=1, node_depth=0, last_node=True)
>>> # Root node
... h10 = blake2b(digest_size=32, fanout=FANOUT, depth=DEPTH,
... leaf_size=LEAF_SIZE, inner_size=INNER_SIZE,
... node_offset=0, node_depth=1, last_node=True)
>>> h10.update(h00.digest())
>>> h10.update(h01.digest())
>>> h10.hexdigest()
'3ad2a9b37c6070e374c7a8c508fe20ca86b6ed54e286e93a0318e95e881db5aa'
Credits
^^^^^^^
BLAKE2_ was designed by *Jean-Philippe Aumasson*, *Samuel Neves*, *Zooko
Wilcox-O'Hearn*, and *Christian Winnerlein* based on SHA-3_ finalist BLAKE_
created by *Jean-Philippe Aumasson*, *Luca Henzen*, *Willi Meier*, and
*Raphael C.-W. Phan*.
It uses core algorithm from ChaCha_ cipher designed by *Daniel J. Bernstein*.
The stdlib implementation is based on pyblake2_ module. It was written by
*Dmitry Chestnykh* based on C implementation written by *Samuel Neves*. The
documentation was copied from pyblake2_ and written by *Dmitry Chestnykh*.
The C code was partly rewritten for Python by *Christian Heimes*.
The following public domain dedication applies for both C hash function
implementation, extension code, and this documentation:
To the extent possible under law, the author(s) have dedicated all copyright
and related and neighboring rights to this software to the public domain
worldwide. This software is distributed without any warranty.
You should have received a copy of the CC0 Public Domain Dedication along
with this software. If not, see
https://creativecommons.org/publicdomain/zero/1.0/.
The following people have helped with development or contributed their changes
to the project and the public domain according to the Creative Commons Public
Domain Dedication 1.0 Universal:
* *Alexandr Sokolovskiy*
.. _BLAKE2: https://blake2.net
.. _HMAC: https://en.wikipedia.org/wiki/Hash-based_message_authentication_code
.. _BLAKE: https://131002.net/blake/
.. _SHA-3: https://en.wikipedia.org/wiki/NIST_hash_function_competition
.. _ChaCha: https://cr.yp.to/chacha.html
.. _pyblake2: https://pythonhosted.org/pyblake2/
.. _NIST-SP-800-132: https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-132.pdf
.. _stackexchange pbkdf2 iterations question: https://security.stackexchange.com/questions/3959/recommended-of-iterations-when-using-pbkdf2-sha256/
2007-08-15 11:28:22 -03:00
.. seealso::
Module :mod:`hmac`
A module to generate message authentication codes using hashes.
Module :mod:`base64`
Another way to encode binary hashes for non-binary environments.
https://blake2.net
Official BLAKE2 website.
https://csrc.nist.gov/csrc/media/publications/fips/180/2/archive/2002-08-01/documents/fips180-2.pdf
2007-08-15 11:28:22 -03:00
The FIPS 180-2 publication on Secure Hash Algorithms.
2015-09-27 06:05:01 -03:00
https://en.wikipedia.org/wiki/Cryptographic_hash_function#Cryptographic_hash_algorithms
Wikipedia article with information on which algorithms have known issues and
2007-08-15 11:28:22 -03:00
what that means regarding their use.
https://www.ietf.org/rfc/rfc8018.txt
PKCS #5: Password-Based Cryptography Specification Version 2.1
https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-132.pdf
NIST Recommendation for Password-Based Key Derivation.