Blockchain Lab Package

A comprehensive Python package containing various blockchain implementations and cryptographic utilities developed for blockchain laboratory exercises.

Features

• RSA Key Generator: Generate RSA key pairs using OpenSSL
• Simple Blockchain: Basic blockchain implementation with proof-of-work
• Wallet Shell: Interactive crypto wallet shell using Web3
• Merkle Blockchain: Advanced blockchain with Merkle tree verification
• Solidity Contracts: Smart contracts including BalanceTransfer and LabCoin

Installation

Option 1: Install from source

cd blockchain-lab-7th-sem
pip install -e .

Option 2: Install dependencies manually

pip install web3

Usage

Import and use modules

# Import the package
import blockchain_lab_package

# List available modules
blockchain_lab_package.list_modules()

# Print source code of any module
blockchain_lab_package.print_source('simple_blockchain')

# Print all source codes
blockchain_lab_package.print_all_sources()

# Print Solidity contracts
blockchain_lab_package.print_solidity_contracts()

# Use individual modules
from blockchain_lab_package import simple_blockchain, rsa_key_generator, solidity_contracts

# Run demonstrations
simple_blockchain.demo()
rsa_key_generator.demo()
solidity_contracts.demo()

Interactive Examples

Simple Blockchain

from blockchain_lab_package.simple_blockchain import Blockchain

# Create a blockchain
chain = Blockchain()
chain.add_block("Alice pays Bob 10 coins")
chain.add_block("Bob pays Charlie 5 coins")

# Validate the chain
print("Valid chain:", chain.is_chain_valid())

RSA Key Generator

from blockchain_lab_package.rsa_key_generator import generate_rsa_keys

# Generate RSA keys
generate_rsa_keys("my_private.pem", "my_public.pem", 2048)

Wallet Shell

from blockchain_lab_package.wallet_shell import start_shell

# Start interactive wallet shell
start_shell()

Merkle Blockchain

from blockchain_lab_package.merkle_blockchain import Blockchain, MerkleTree

# Create advanced blockchain
bc = Blockchain(diff=2)
block = bc.add(["Alice->Bob:5", "Carol->Dave:2"])

# Generate and verify Merkle proof
tree = MerkleTree(block.txs)
proof = tree.proof(0)
is_valid = tree.verify(block.txs[0], proof, tree.root())

Quick Start - Print Source Codes

The primary feature of this package is to easily access and print source codes:

import blockchain_lab_package as blp

# Print specific module source
blp.print_source('rsa_key_generator')
blp.print_source('simple_blockchain')
blp.print_source('wallet_shell')
blp.print_source('merkle_blockchain')
blp.print_source('solidity_contracts')

# Print Solidity contracts only
blp.print_solidity_contracts()

# Or print all at once
blp.print_all_sources()

Requirements

• Python 3.7+
• web3 (for wallet shell functionality)
• OpenSSL (for RSA key generation)

Modules Overview

1. RSA Key Generator (rsa_key_generator)

• Generate RSA public/private key pairs
• Uses OpenSSL for secure key generation
• Configurable key sizes

2. Simple Blockchain (simple_blockchain)

• Basic blockchain implementation
• SHA-256 hashing
• Chain validation
• Genesis block creation

3. Wallet Shell (wallet_shell)

• Interactive command-line wallet
• Web3 integration with Ethereum test provider
• Send/receive transactions
• Balance checking
• Block inspection

4. Merkle Blockchain (merkle_blockchain)

• Advanced blockchain with Merkle trees
• Proof-of-work mining
• Transaction verification
• Merkle proof generation and verification

5. Solidity Contracts (solidity_contracts)

• Smart contract source codes
• BalanceTransfer contract for Ether transfers
• LabCoin ERC-20 style token contract
• Contract deployment templates

License

MIT License

Author

Blockchain Lab - Educational Implementation