ml-dsa: lower stack size of KeyGen::from_seed by up to 207kb#1261
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tarcieri merged 1 commit intoRustCrypto:masterfrom Mar 25, 2026
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ml-dsa: lower stack size of KeyGen::from_seed by up to 207kb#1261tarcieri merged 1 commit intoRustCrypto:masterfrom
tarcieri merged 1 commit intoRustCrypto:masterfrom
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This lowers the stack size by 136kB in release mode (ML-DSA-87). |
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cc @mgodf89 |
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Tested this and #1259 in a fairly large repository and that fixed our immediate issues with stack sizes (we had stack overflows in the test suite). |
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This reworks the API to make KeyGen::from_seed return a `SeededSigningKey` instead of a `KeyPair`. The `SeededSigningKey` effectively replaces the `KeyPair`, and instead of eagerly generating the VerifyingKey (implementing `signature::KeypairRef`), it implements `signature::Keypair` and makes the verifying key when requested. This reduces the depth of the stack when calling from_seed and reduces the size of the stack by 207kb using ML-DSA-87 in debug/tests builds (the heaviest consumers). This is an API break.
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When ExpandedSigningKey was split from SigningKey in RustCrypto#1261, the derive for Clone and PartialEq got removed.
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When ExpandedSigningKey was split from SigningKey in #1261, the derive for Clone and PartialEq got removed.
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This reworks the API to make KeyGen::from_seed return a
SeededSigningKeyinstead of aKeyPair.The
SeededSigningKeyeffectively replaces theKeyPair, and instead of eagerly generating the VerifyingKey (implementingsignature::KeypairRef), it implementssignature::Keypairand makes the verifying key when requested.This reduces the depth of the stack when calling from_seed and reduces the size of the stack by 207kb using ML-DSA-87 in debug/tests builds (the heaviest consumers).
This is an API break.
See #1024