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lib: add KUnit tests for base64 encoding/decoding

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Add a KUnit test suite to validate the base64 helpers.  The tests cover
both encoding and decoding, including padded and unpadded forms as defined
by RFC 4648 (standard base64), and add negative cases for malformed inputs
and padding errors.

The test suite also validates other variants (URLSAFE, IMAP) to ensure
their correctness.

In addition to functional checks, the suite includes simple
microbenchmarks which report average encode/decode latency for small (64B)
and larger (1KB) inputs.  These numbers are informational only and do not
gate the tests.

Kconfig (BASE64_KUNIT) and lib/tests/Makefile are updated accordingly.

Sample KUnit output:

    KTAP version 1
    # Subtest: base64
    # module: base64_kunit
    1..4
    # base64_performance_tests: [64B] encode run : 32ns
    # base64_performance_tests: [64B] decode run : 35ns
    # base64_performance_tests: [1KB] encode run : 510ns
    # base64_performance_tests: [1KB] decode run : 530ns
    ok 1 base64_performance_tests
    ok 2 base64_std_encode_tests
    ok 3 base64_std_decode_tests
    ok 4 base64_variant_tests
    # base64: pass:4 fail:0 skip:0 total:4
    # Totals: pass:4 fail:0 skip:0 total:4

Link: https://lkml.kernel.org/r/20251114060157.89507-1-409411716@gms.tku.edu.tw
Signed-off-by: Guan-Chun Wu <409411716@gms.tku.edu.tw>
Reviewed-by: Kuan-Wei Chiu <visitorckw@gmail.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: David Laight <david.laight.linux@gmail.com>
Cc: Eric Biggers <ebiggers@kernel.org>
Cc: Ilya Dryomov <idryomov@gmail.com>
Cc: Jaegeuk Kim <jaegeuk@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Keith Busch <kbusch@kernel.org>
Cc: Sagi Grimberg <sagi@grimberg.me>
Cc: "Theodore Y. Ts'o" <tytso@mit.edu>
Cc: Viacheslav Dubeyko <Slava.Dubeyko@ibm.com>
Cc: Xiubo Li <xiubli@redhat.com>
Cc: Yu-Sheng Huang <home7438072@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Guan-Chun Wu
2025-11-14 14:01:57 +08:00
committed by Andrew Morton
parent 9c7d3cf94d
commit 8b365c4f5b
3 changed files with 313 additions and 1 deletions
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19
lib/Kconfig.debug
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@@ -2815,8 +2815,25 @@ config CMDLINE_KUNIT_TEST
If unsure, say N.
config BASE64_KUNIT
tristate "KUnit test for base64 decoding and encoding" if !KUNIT_ALL_TESTS
depends on KUNIT
default KUNIT_ALL_TESTS
help
This builds the base64 unit tests.
The tests cover the encoding and decoding logic of Base64 functions
in the kernel.
In addition to correctness checks, simple performance benchmarks
for both encoding and decoding are also included.
For more information on KUnit and unit tests in general please refer
to the KUnit documentation in Documentation/dev-tools/kunit/.
If unsure, say N.
config BITS_TEST
tristate "KUnit test for bits.h" if !KUNIT_ALL_TESTS
tristate "KUnit test for bit functions and macros" if !KUNIT_ALL_TESTS
depends on KUNIT
default KUNIT_ALL_TESTS
help