8000 Add WHIRLPOOL hashing to stdlib by NotsoanoNimus · Pull Request #2273 · c3lang/c3c · GitHub
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Add WHIRLPOOL hashing to stdlib #2273

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Add WHIRLPOOL hashing to stdlib #2273

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@NotsoanoNimus NotsoanoNimus commented Jul 4, 2025 •
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Dedicating my recent work on a WHIRLPOOL hashing library to the C3 stdlib.

This is an alternative way to generate a 512-bit hash that has a strong focus on security over speed. Therefore, it should be used in applications like digital signatures rather than latency-sensitive areas like real-time communication.

❗ ❗ ❗
A really neat thing about the C3 implementation is that it can successfully hash up to the original WHIRLPOOL's proclaimed 2^256 bits of data, unlike popular implementations such as RHash which can only do 2^64 bits for “optimization purposes”.

Additionally, C3's version has HMAC and PBKDF2: very rare to see these so accessible for WHIRLPOOL. :)
❗ ❗ ❗

Related unit tests have been run before committing and are passing:

--------------------------------- TESTS ----------------------------------
Testing std::hash::whirlpool_test::test_whirlpool_empty ............. [PASS]
Testing std::hash::whirlpool_test::test_whirlpool_expected_outputs .. [PASS]
Testing std::hash::whirlpool_test::test_whirlpool_gigahash_zeroes ... [PASS]
Testing std::hash::whirlpool_test::test_whirlpool_hmac .............. [PASS]
Testing std::hash::whirlpool_test::test_whirlpool_pbkdf2 ............ [PASS]
Testing std::hash::whirlpool_test::test_whirlpool_pbkdf2_2 .......... [PASS]
Testing std::hash::whirlpool_test::test_whirlpool_pbkdf2_3 .......... [PASS]
Testing std::hash::whirlpool_test::test_whirlpool_pbkdf2_4 .......... [PASS]
Testing std::hash::whirlpool_test::test_whirlpool_sweep_block_size .. [PASS]

9 tests run.

Test Result: PASSED: 9 passed, 0 failed, 0 skipped.
Program completed with exit code 0.

lerno
lerno reviewed Jul 5, 2025
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@NotsoanoNimus
update max 'update' span to ''isz.max'
4d783ca 
This limitation doesn't really need to be there because, per discussions, any slice going over the architecture's max native width for pointer lengths is broken anyhow.
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