Adds full MIP-04 (Encrypted Media) support for Marmot group chats:
Protocol layer (quartz):
- Mip04MediaEncryption: ChaCha20-Poly1305 AEAD with MLS exporter key
derivation (HKDF-Expand), random nonces, and AAD binding
- Mip04Cipher/Mip04NostrCipher: NostrCipher adapters for the existing
EncryptedBlobInterceptor download-and-decrypt pipeline
- Mip04IMetaTag: NIP-92 imeta tag builder/parser with MIP-04 fields
(url, m, filename, x, n, v=mip04-v2)
- MlsGroupManager.mediaExporterSecret(): MLS-Exporter("marmot",
"encrypted-media", 32)
Upload flow (amethyst):
- MarmotFileUploader: per-file Mip04NostrCipher → existing
UploadOrchestrator.uploadEncrypted pipeline (compression, stripping,
Blossom upload)
- MarmotFileSender: builds imeta tags and sends kind:9 inner events
through the MLS group message pipeline
- MarmotGroupMessageComposer: adds SelectFromGallery leading icon and
ChatFileUploadDialog (mirrors NIP-17 DM pattern)
Display flow:
- RenderMarmotEncryptedMedia: parses imeta v=mip04-v2 tags, derives
Mip04Cipher, registers in EncryptionKeyCache, renders via
ZoomableContentView (same path as NIP-17 encrypted files)
- MarmotGroupList.noteToGroupIndex: reverse index for mapping notes
back to their group ID (needed for exporter secret lookup)
- ChatMessageCompose NoteRow: routes MIP-04 events to the new renderer
https://claude.ai/code/session_01TckzZLpJdmE6p198DHBQ5i
Claude
5f5d576f1e