Decrypts a PSK message envelope.
Automatically detects if we are the sender or recipient and uses the appropriate decryption path.
PSK envelope to decrypt
Our X25519 private key
Our X25519 public key
Current ratchet-derived PSK (32 bytes)
Decrypted message content, or null for key-publish payloads
Decrypts a PSK message envelope.
Automatically detects if we are the sender or recipient and uses the appropriate decryption path.