👨‍💻Technical Deep dive

contracts

Detailed Explanation of Aptos Smart Contracts

Overview

The Aptos smart contracts consist of three main modules: User Registration, Random Number Generation, and Aggregation. Each module is designed to support different functionalities in the federated learning architecture.

1. User Registration Module

Structure

module registry::user_registration {
    use std::signer;
    use std::string;
    use std::error;
    use aptos_framework::event;
    #[test_only]
    use std::debug;

• The module imports necessary libraries and defines dependencies like signer management and string handling.

User Registry Resource

struct UserRegistry has key {
    user_id: string::String,
}

• UserRegistry: A struct that holds user registration information, specifically a user ID, and is stored as a resource with a unique key.

Events

#[event]
struct UserRegistrationEvent has drop, store {
    account: address,
    old_user_id: string::String,
    new_user_id: string::String,
}

• UserRegistrationEvent: An event that is emitted when a user registers or updates their information, containing the account address and the old and new user IDs.

Entry Functions

public entry fun register_user(account: signer, new_user_id: string::String) acquires UserRegistry {
    ...
}

• register_user: The primary function for user registration. It checks if a user is already registered and either creates a new entry or updates an existing one. It also emits a registration event upon updates.

View Functions

rustCopy code#[view]
public fun get_user_id(addr: address): string::String acquires UserRegistry {
    ...
}

• get_user_id: Allows querying of a registered user ID by address, asserting that a user is registered.

2. Random Number Generation Module

Structure

rustCopy codemodule generator::RandomNumberGenerator {
    use aptos_framework::randomness;
    use aptos_framework::event;
    use std::signer;
    use std::error;

• This module imports the randomness framework and other standard libraries.

Random Value Resource

rustCopy codestruct RandomValueStore has key {
    owner: address,
    generated_value: GeneratedRandomValue,
}

• RandomValueStore: Holds the generated random value for each user, linking it to the user's address.

Events

#[event]
struct RandomValueGenerated has drop, store {
    account: address,
    r: vector<u8>,
}

• RandomValueGenerated: An event emitted when a new random value is generated, capturing the associated account and value.

Entry Functions

public entry fun generate_random_value(account: &signer) acquires RandomValueStore {
    ...
}

• generate_random_value: Generates a random byte vector for a user, emits an event, and stores the value in a user-specific resource.

View Functions

public fun get_random_value(addr: address): vector<u8> acquires RandomValueStore {
    ...
}

• get_random_value: Retrieves the random value generated for a user, ensuring that it exists in the store.

3. Aggregation Module

Structure

module aggregator::aggregator {
    use std::vector;
    use aptos_std::type_info::{Self, TypeInfo};

• The module focuses on handling encrypted data and performing aggregation functions.

Parameter Initialization

struct Params has key {
    p: vector<u8>,
    q: vector<u8>,
    g: vector<u8>,
    h: vector<u8>,
}

• Params: Stores the parameters needed for the aggregation and commitment process.

Encrypted Data Storage

struct EncryptedValueStore has key {
    account: address,
    encrypted_value: vector<u8>,
}

• EncryptedValueStore: Stores encrypted values submitted by users for aggregation.

Entry Functions

public entry fun initialize(p: vector<u8>, q: vector<u8>, g: vector<u8>, h: vector<u8>) {
    ...
}

• initialize: Sets up the necessary parameters for the aggregation process, enabling contract configuration.

public entry fun add_encrypted_value(account: signer, encrypted_value: vector<u8>) acquires EncryptedValueStore {
    ...
}

• add_encrypted_value: Accepts an encrypted value from a user, storing it in the EncryptedValueStore.

public entry fun multiply_encrypted_values(values: vector<vector<u8>>) acquires EncryptedValueStore {
    ...
}

• multiply_encrypted_values: Placeholder for multiplying encrypted values (specific implementation details need further development).

rpublic entry fun decrypt(values: vector<vector<u8>>) {
    ...
}

• decrypt: Placeholder for the decryption process of aggregated encrypted values, requiring implementation of the decryption logic.