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Cairo Hashes

Explain Cairo hashing with Poseidon and Pedersen, Hash/HashState traits, and hashing structs/arrays; use when a request involves computing hashes or deriving Hash in Cairo.

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Cairo Hashes

Overview

Guide hashing in Cairo with Poseidon and Pedersen and the core hash traits.

Quick Use

  • Read references/hashes.md before answering.
  • Pick Poseidon for most Cairo use cases; mention Pedersen for legacy compatibility.
  • Use HashStateTrait + update/finalize in examples.

Response Checklist

  • Use PoseidonTrait::new() or PedersenTrait::new(base) to initialize state.
  • Derive Hash only if all fields are hashable.
  • For arrays, hash a span with poseidon_hash_span.

Example Requests

  • "How do I hash a struct in Cairo?"
  • "Should I use Pedersen or Poseidon?"
  • "Why can't I derive Hash for this struct?"

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