{
  "context": "This evaluation assesses how well the engineer uses @stablelib/sha256's state serialization capability to optimize hash computation for messages with a shared prefix, specifically testing knowledge of saveState(), restoreState(), and cleanSavedState() methods.",
  "type": "weighted_checklist",
  "checklist": [
    {
      "name": "SHA256 Instance Creation",
      "description": "Creates a SHA256 instance (using 'new SHA256()') to perform hash operations",
      "max_score": 10
    },
    {
      "name": "Prefix State Initialization",
      "description": "Calls update() method on SHA256 instance with the secret prefix during initialization to establish the base hash state",
      "max_score": 15
    },
    {
      "name": "State Serialization Usage",
      "description": "Uses saveState() method to capture the hash state after processing the prefix, enabling reuse across multiple messages",
      "max_score": 30
    },
    {
      "name": "State Restoration Usage",
      "description": "Uses restoreState() method before each message hash to restore the saved prefix state, avoiding recomputation",
      "max_score": 30
    },
    {
      "name": "Message Hash Completion",
      "description": "Calls update() with message data after state restoration and uses digest() to finalize and return the hash result",
      "max_score": 10
    },
    {
      "name": "Secure Cleanup",
      "description": "Uses cleanSavedState() to wipe saved state and clean() to wipe hasher instance in the cleanup() method",
      "max_score": 5
    }
  ]
}