ml-dsa: Rename KeyGen::key_gen_internal to from_seed#1054
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… verifying key from_seed methods
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tarcieri
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Sep 12, 2025
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I'll follow up myself with my requested changes from earlier |
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Thanks @tarcieri. Initialising a verifying key from seed was removed and this PR doesn't have the code duplication the previous one suffered from. Apologies if I missed other suggestions? |
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Upon another pass it looks fine, thanks! |
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This is an alternative to #1046 to reduce copying the seed derivation logic. Implementing a
from_seedas raised in issue #1045.KeyGen::key_gen_internaltoKeyGen::from_seed.SigningKey::from_seed. This internally callsKeyGen::from_seedfor now, as the majority of the computational work is the same for both keys. A future PR could be slightly more efficient by specialising the SigningKey from_seed method by skipping the couple of extra steps performed to also compute a VerifyingKey, but ml-dsa:SigningKey::from_seed(&B32)implementation #1046 shows this only nets a 20us / 10% speed up.from_seedimplementations don't deviate from each other in future, if more efficient implementations are provided.I am not sure why
key_gen_internalwas commented to be behind a feature flag or private, as I believe deriving from a seed value is a must-have, assuming this implementation correctly matches the spec. I can look through the spec and codebase for test vectors to make sure, if desired?Cheers!