Two bugs in quartz's NIP-46 remote signer:
1. FixedKey.getEncoded() returned the raw byte array reference. javax.crypto.Mac
zeroes the key via destroy() after HMAC computation, corrupting the NIP-44
saltPrefix ("nip44-v2") after the first computeConversationKey call. All
subsequent NIP-44 decryptions with different key pairs fail with Invalid Mac.
Fix: return key.copyOf() instead of key.
2. NostrSignerRemote.connect() only handled pubkey responses. Amber (and other
signers) may respond with "ack" or "already connected" error. Added
ConnectResponse parser that maps these to success and falls back to
getPublicKey() to retrieve the actual pubkey.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
nrobi144
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