Upgrades hmac module and test suite from Python 3.14.2 as part of the ongoing stdlib modernization effort.

Changes

• Lib/hmac.py: Updated to support three HMAC implementations (OpenSSL, HACL*, pure Python) with automatic fallback logic. Added _get_digest_constructor() helper and _compute_digest_fallback() for overflow handling.

• Lib/test/test_hmac.py: Comprehensive rewrite using mixin-based architecture to test all three implementations. Increased test coverage from ~150 to 142 tests with better organization.

• Test markers: 27 tests marked as @unittest.expectedFailure due to missing RustPython _hashlib features:

  • _hashlib.HMAC class
  • _hashlib.hmac_digest() function
  • Full hmac_new() implementation (currently raises UnsupportedDigestmodError)

Test Results

142 tests total: 68 passed, 48 skipped (platform/module dependencies), 26 expected failures.

This section details on the original issue you should resolve

<issue_title>Upgrade Python libraries and test from Python 3.14</issue_title>
<issue_description>## Summary

Check scripts/update_lib for tools. As a note, the current latest Python version is v3.14.2.

Previous versions' issues as reference

• 3.13: Update Python libraries and tests from Python 3.13 #5529

Details

2026-01-24

$ python3 scripts/update_lib todo  --done

• [no deps] types (40 dependents)
  • test_types (10 TODO)
• [no deps] struct (17 dependents)
  • test_struct (4 TODO)
• [no deps] stat (14 dependents)
  • test_stat
• [no deps] operator (13 dependents)
  • test_operator (3 TODO)
• [no deps] linecache (9 dependents)
  • test_linecache
• [no deps] keyword (8 dependents)
  • test_keyword
• [no deps] codecs (8 dependents)
  • test_codecs (98 TODO)
• [no deps] future (6 dependents)
• [no deps] copyreg (6 dependents)
  • test_copyreg
• [no deps] reprlib (6 dependents)
  • test_reprlib (4 TODO)
• [no deps] bisect (5 dependents)
  • test_bisect
• [no deps] token (5 dependents)
• [no deps] string (5 dependents)
  • test_string
• [no deps] heapq (4 dependents)
  • test_heapq
• [no deps] hashlib (2 dependents)
  • test_hashlib (10 TODO)
• [no deps] hmac (2 dependents)
  • test_hmac (18 TODO)
• [no deps] quopri (2 dependents)
  • test_quopri
• [no deps] _sitebuiltins (2 dependents)
• [no deps] _compat_pickle (1 dependents)
• [no deps] _opcode_metadata (1 dependents)
• [no deps] mimetypes (1 dependents)
  • test_mimetypes
• [no deps] cmd (1 dependents)
  • test_cmd
• [no deps] stringprep (1 dependents)
  • test_stringprep
• [no deps] tty (1 dependents)
  • test_tty (2 TODO)
• [no deps] hello
• [no deps] phello
• [no deps] colorsys
  • test_colorsys
• [no deps] this
• [no deps] _ios_support
• [no deps] pydoc_data
• [no deps] timeit
  • test_timeit
• [no deps] zipimport
  • test_zipimport (2 TODO)
• [0/3 deps] os (76 dependents)
  • test_os (18 TODO)
• [0/4 deps] collections (32 dependents)
  • test_collections (3 TODO)
• [0/1 deps] warnings (23 dependents)
  • test_warnings (40 TODO)
• [0/1 deps] enum (17 dependents)
  • test_enum (15 TODO)
• [0/1 deps] datetime (13 dependents)
  • test_datetime
• [0/1 deps] _collections_abc (9 dependents)
• [0/1 deps] base64 (8 dependents)
  • test_base64
• [0/1 deps] textwrap (6 dependents)
  • test_textwrap
• [0/1 deps] _weakrefset (4 dependents)
• [0/2 deps] codeop (3 dependents)
  • test_codeop (5 TODO)
• [0/1 deps] numbers (3 dependents)
• [0/1 deps] contextvars (3 dependents)
• [0/3 deps] decimal (2 dependents)
  • test_decimal (2 TODO)
• [0/1 deps] _markupbase (1 dependents)
• [0/1 deps] ipaddress (1 dependents)
  • test_ipaddress
• [0/4 deps] fractions (1 dependents)
  • test_fractions (1 TODO)
• [0/4 deps] rlcompleter (1 dependents)
  • test_rlcompleter (1 TODO)
• [0/1 deps] graphlib
  • test_graphlib
• [0/1 deps] nturl2path
  • test_nturl2path
• [0/2 deps] sre_compile
• [0/2 deps] sre_constants
• [0/2 deps] sre_parse
• [1/3 deps] re (45 dependents)
  • test_re (19 TODO)
• [1/5 deps] functools (33 dependents)
  • test_functools (11 TODO)
• [1/1 deps] abc (15 dependents)
  • test_abc (1 TODO)
• [1/2 deps] weakref (14 dependents)
  • test_weakref (28 TODO)
• [1/3 deps] copy (9 dependents)
  • test_copy
• [1/2 deps] ast (7 dependents)
  • test_ast (104 TODO)
• [1/1 deps] signal (6 dependents)
  • test_signal (3 TODO)
• [1/3 deps] posixpath (6 dependents)
  • test_posixpath (4 TODO)
• [1/4 deps] random (6 dependents)
  • test_random
• [1/6 deps] typing (6 dependents)
  • test_typing (21 TODO)
• [1/8 deps] dataclasses (5 dependents)
  • test_dataclasses (10 TODO)
• [1/4 deps] queue (4 dependents)
  • test_queue
• [1/4 deps] json (4 dependents)
  • test_json (18 TODO)
• [1/2 deps] selectors (4 dependents)
  • test_selectors
• [1/2 deps] gettext (3 dependents)
  • test_gettext (7 TODO)
• [1/1 deps] shlex (3 dependents)
  • test_shlex (4 TODO)
• [1/3 deps] locale (3 dependents)
  • test_locale
• [1/3 deps] difflib (2 dependents)
  • test_difflib
• [1/2 deps] genericpath (2 dependents)
  • test_genericpath (1 TODO)
• [1/2 deps] html (2 dependents)
  • test_html
• [1/3 deps] site (2 dependents)
  • test_site (5 TODO)
• [1/3 deps] filecmp (1 dependents)
  • test_filecmp
• [1/2 deps] ntpath (1 dependents)
  • test_ntpath
• [1/1 deps] opcode (1 dependents)
• [1/1 deps] pyclbr (1 dependents)
  • test_pyclbr (3 TODO)
    -...

• Fixes Upgrade Python libraries and test from Python 3.14 #6839

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