cairo-hashes

name: cairo-hashes description: 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.

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?"