Optimize Msg Structures #58

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1. diegomrsantos commented on Mar 4, 2026

   

   diegomrsantos

   on Mar 4, 2026

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   Suggestion: use fixed-size encoding for RSA signatures

   SignedSSVMessage.Signatures is currently defined as:

   Signatures  [][]byte  `ssz-max:"13,256"`

   Since RSA-2048 signatures are always exactly 256 bytes (output is always the size of the modulus), the inner dimension could use fixed-size encoding instead of variable-length. The current ssz-max:"13,256" allows signatures shorter than 256 bytes at the wire level, which are never valid for RSA-2048.

   Using fixed-size inner encoding would:

   • Enforce the invariant at the SSZ layer
   • Produce slightly more compact encoding (no offset pointers per signature)
   • Eliminate the need for runtime signature size validation

   This came up during review of structural validation in Anchor — the VariableList<u8, U256> type (matching the Go spec) only guarantees <= 256, not == 256, so exact-size checks must be done at validation time rather than being enforced by the type system.
2. mergify

   added a commit that references this issue on Mar 5, 2026

   fix: validate SignedSSVMessage on SSZ-decoded network messages (#853)

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   7d842fe