密钥管理

// Simplified transaction signing process
async fn sign_transaction(derivation_path: &str, transaction: &Transaction) -> Result<SignedTransaction, Error> {
    // 1. Retrieve encrypted seed phrase
    let encrypted_seed = get_encrypted_seed(derivation_path).await?;

    // 2. Decrypt using advanced AES-256-GCM
    let seed_phrase = advanced_decrypt(&encrypted_seed).await?;

    // 3. Compute private key
    let private_key = derive_private_key(&seed_phrase, derivation_path)?;

    // 4. Sign transaction
    let signed_tx = sign_with_private_key(&private_key, transaction)?;

    // 5. Securely clear private key from memory
    secure_clear(&private_key);

    Ok(signed_tx)
}