Step 3: HS descriptor parsing

[igor53627]

Parent Issue

Part of #23 (Onion service support)

Overview

Parse v3 hidden service descriptors to extract introduction points.

Tasks

• Use tor-netdoc HS descriptor parsing (if available)
• Decrypt outer and inner descriptor layers
• Extract introduction point information:
  • Relay identity/link specifiers
  • Introduction point auth keys
  • Encryption keys for INTRODUCE1
• Store parsed intro points for use in rendezvous

Technical Notes

• HS descriptors have multiple encryption layers
• Need service's blinded key + subcredential to decrypt
• tor-netdoc may have hsdesc module for this

Dependencies

• Step 2: HSDir descriptor fetching #38 (HSDir descriptor fetching)

Acceptance Criteria

• Can parse encrypted HS descriptor
• Extracts at least one valid introduction point
• Handles malformed descriptors with clear errors