DanS
46eec37013
Swap the in-memory-only chat store for durable sqlite persistence with real
per-transaction timestamps, encrypted at rest under a key derived from the
wallet's own seed (no passphrase, works on encrypted and unencrypted wallets).
- ChatDatabase (src/chat/chat_database.{h,cpp}): sqlite store mirroring
data::TransactionHistoryCache. unlockWithSecret(seed) derives a 32-byte AEAD
storage key and a wallet-partition tag via domain-separated keyed BLAKE2b
(generichash) contexts. Every record — bodies, peer z-addrs, threading,
timestamps — is crypto_aead_xchacha20poly1305_ietf-encrypted with a random
nonce and the wallet tag as associated data; even the dedup key is a keyed
hash of txid+position, so nothing about your conversations is in cleartext on
disk. Rows are partitioned per-wallet; a different seed sees nothing. Messages
are decrypted once at ingest then re-encrypted under the storage key, so
load() needs only the storage key, not the chat identity.
- ChatService: ingest() now stamps each message with its own transaction time
(txid->time map + fallback) and writes new (store-deduped) messages through to
the database; loadFromDatabase() rehydrates the in-memory read model on unlock.
- App: unlock the chat DB with the same seed in provisionChatIdentityFromSecret
and load prior history; lock the DB + clear the decrypted in-memory store on
relock and on lite-controller rebuild.
Adversarial review (4 confirmed findings, all fixed): don't provision if the
wallet locks mid-fetch (re-check isLocked at completion); wipe the serialized
plaintext temporary in append(); trim the seed into a separate fully-wiped
buffer (no residue past a shrunk size()); scrub the mnemonic copy in the RPC
json result.
Tests: ChatDatabase round-trip (persist/reload, field + order fidelity), dedup,
per-wallet isolation, lock inertness, and ChatService write-through + reload
without an identity. Gated by DRAGONX_ENABLE_CHAT (default OFF). Verified:
Linux + Windows(mingw) build with chat ON, ctest 100%, hygiene clean; caches
restored to the OFF default.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
75 lines
3.0 KiB
C++
75 lines
3.0 KiB
C++
#pragma once
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// DragonX Wallet - HushChat persistent message store (Phase 2).
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//
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// Sqlite-backed, encrypted at rest with a SEED-DERIVED key (no wallet passphrase). Every record —
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// message bodies, peer z-addresses, threading (conversation id), and timestamps — is AEAD-encrypted
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// under a key derived from the wallet's own seed secret (the same secret used for the chat
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// identity), and even the per-message dedup key is a KEYED hash of the txid — so the database
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// reveals nothing about your conversations to disk-level access without the seed. Rows are
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// partitioned by a seed-derived wallet tag so one file can hold several wallets, each readable only
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// with its own seed. Not thread-safe — drive from the main thread. Mirrors the lifecycle of
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// data::TransactionHistoryCache.
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#include "chat_message.h"
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#include <array>
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#include <cstddef>
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#include <string>
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#include <vector>
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struct sqlite3;
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namespace dragonx::chat {
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class ChatDatabase {
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public:
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ChatDatabase();
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explicit ChatDatabase(std::string databasePath);
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~ChatDatabase();
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ChatDatabase(const ChatDatabase&) = delete;
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ChatDatabase& operator=(const ChatDatabase&) = delete;
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static std::string defaultDatabasePath();
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// Derive the storage key + wallet tag from the wallet's seed secret and open the DB. The caller
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// still owns and must wipe `secret`. Returns false on sodium/db failure (DB then stays locked).
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bool unlockWithSecret(const std::string& secret);
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void lock(); // wipe the key material (DB handle stays open); load()/append() then no-op
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bool hasKey() const { return key_ready_; }
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// Persist one message (INSERT OR IGNORE, deduped by a keyed hash of txid+payload_position).
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// Returns true if newly inserted; false on duplicate or while locked.
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bool append(const ChatMessage& message);
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// Decrypt and return every stored message for the unlocked wallet, in insertion order. Empty
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// while locked or if none. Rows that fail to decrypt/parse are skipped.
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std::vector<ChatMessage> load();
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void clearWallet(); // delete the unlocked wallet's rows
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private:
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bool ensureOpen();
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bool exec(const char* sql);
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bool createSchema();
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std::string dedupHash(const std::string& txid, std::size_t position) const;
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std::string serialize(const ChatMessage& message) const;
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bool deserialize(const std::string& json, ChatMessage& out) const;
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bool encrypt(const std::string& plain,
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std::vector<unsigned char>& nonce,
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std::vector<unsigned char>& cipher) const;
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bool decrypt(const std::vector<unsigned char>& nonce,
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const std::vector<unsigned char>& cipher,
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std::string& plain) const;
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void close();
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sqlite3* db_ = nullptr;
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std::string database_path_;
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std::array<unsigned char, 32> key_{}; // AEAD storage key (seed-derived)
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std::string wallet_tag_; // seed-derived row partition (a keyed hash, hex)
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bool key_ready_ = false;
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};
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} // namespace dragonx::chat
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