Function decrypt_message 

pub fn decrypt_message(
    bridge: &mut SignalBridge,
    peer: &str,
    ciphertext: &[u8],
) -> Result<DecryptionResult, Box<dyn Error>>

Decrypts an incoming Signal Protocol message

Arguments

• bridge - Signal bridge instance
• peer - Sender’s RDX fingerprint or Nostr pubkey (peer hint)
• ciphertext - Encrypted message bytes