mleku ea4a54c5e7 Add Cashu blind signature access tokens (NIP-XX draft) ...

Implements privacy-preserving bearer tokens for relay access control using
Cashu-style blind signatures. Tokens prove whitelist membership without
linking issuance to usage.

Features:
- BDHKE crypto primitives (HashToCurve, Blind, Sign, Unblind, Verify)
- Keyset management with weekly rotation
- Token format with kind permissions and scope isolation
- Generic issuer/verifier with pluggable authorization
- HTTP endpoints: POST /cashu/mint, GET /cashu/keysets, GET /cashu/info
- ACL adapter bridging ORLY's access control to Cashu AuthzChecker
- Stateless revocation via ACL re-check on each token use
- Two-token rotation for seamless renewal (max 2 weeks after blacklist)

Configuration:
- ORLY_CASHU_ENABLED: Enable Cashu tokens
- ORLY_CASHU_TOKEN_TTL: Token validity (default: 1 week)
- ORLY_CASHU_SCOPES: Allowed scopes (relay, nip46, blossom, api)
- ORLY_CASHU_REAUTHORIZE: Re-check ACL on each verification

Files:
- pkg/cashu/bdhke/: Core blind signature cryptography
- pkg/cashu/keyset/: Keyset management and rotation
- pkg/cashu/token/: Token format with kind permissions
- pkg/cashu/issuer/: Token issuance with authorization
- pkg/cashu/verifier/: Token verification with middleware
- pkg/interfaces/cashu/: AuthzChecker, KeysetStore interfaces
- pkg/bunker/acl_adapter.go: ORLY ACL integration
- app/handle-cashu.go: HTTP endpoints
- docs/NIP-XX-CASHU-ACCESS-TOKENS.md: Full specification

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2025-12-28 11:30:11 +02:00

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