ab87d3c506
- Built complete CEX platform with FastAPI and Python - JWT-based authentication system with secure password hashing - Multi-currency crypto wallet support (BTC, ETH, USDT) - Fiat account management (USD, EUR, GBP) - Local transaction signing without external APIs - Comprehensive transaction handling (send/receive/deposit/withdraw) - SQLAlchemy models with Alembic migrations - Security middleware (rate limiting, headers, logging) - Input validation and sanitization - Encrypted private key storage with PBKDF2 - Standardized codebase architecture with service layer pattern - Complete API documentation with health endpoints - Comprehensive README with setup instructions Features: - User registration and authentication - Crypto wallet creation and management - Secure transaction signing using local private keys - Fiat deposit/withdrawal system - Transaction history and tracking - Rate limiting and security headers - Input validation for all endpoints - Error handling and logging
151 lines
4.8 KiB
Python
151 lines
4.8 KiB
Python
import hashlib
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import secrets
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import ecdsa
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from bitcoin import privtopub, pubtoaddr
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from cryptography.fernet import Fernet
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from cryptography.hazmat.primitives import hashes
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from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC
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import base64
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import os
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from typing import Tuple, Dict
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from web3 import Web3
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class CryptoUtils:
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@staticmethod
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def generate_encryption_key(password: str, salt: bytes = None) -> bytes:
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if salt is None:
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salt = os.urandom(16)
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kdf = PBKDF2HMAC(
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algorithm=hashes.SHA256(),
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length=32,
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salt=salt,
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iterations=100000,
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)
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key = base64.urlsafe_b64encode(kdf.derive(password.encode()))
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return key
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@staticmethod
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def encrypt_private_key(private_key: str, password: str) -> str:
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salt = os.urandom(16)
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key = CryptoUtils.generate_encryption_key(password, salt)
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f = Fernet(key)
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encrypted = f.encrypt(private_key.encode())
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# Combine salt and encrypted data
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return base64.b64encode(salt + encrypted).decode()
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@staticmethod
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def decrypt_private_key(encrypted_key: str, password: str) -> str:
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data = base64.b64decode(encrypted_key.encode())
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salt = data[:16]
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encrypted = data[16:]
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key = CryptoUtils.generate_encryption_key(password, salt)
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f = Fernet(key)
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decrypted = f.decrypt(encrypted)
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return decrypted.decode()
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class BitcoinWallet:
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@staticmethod
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def generate_wallet() -> Tuple[str, str]:
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# Generate private key
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private_key = secrets.randbits(256)
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private_key_hex = hex(private_key)[2:].zfill(64)
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# Generate public key and address
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public_key = privtopub(private_key_hex)
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address = pubtoaddr(public_key)
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return private_key_hex, address
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@staticmethod
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def sign_transaction(private_key_hex: str, transaction_data: Dict) -> str:
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# Simplified transaction signing for Bitcoin
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# In production, use proper Bitcoin transaction libraries
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message = str(transaction_data).encode()
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message_hash = hashlib.sha256(message).digest()
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private_key_int = int(private_key_hex, 16)
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signing_key = ecdsa.SigningKey.from_string(
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private_key_int.to_bytes(32, byteorder='big'),
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curve=ecdsa.SECP256k1
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)
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signature = signing_key.sign(message_hash)
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return signature.hex()
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@staticmethod
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def verify_address(address: str) -> bool:
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# Basic Bitcoin address validation
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try:
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if len(address) < 26 or len(address) > 35:
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return False
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return address.startswith(('1', '3', 'bc1'))
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except Exception:
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return False
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class EthereumWallet:
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@staticmethod
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def generate_wallet() -> Tuple[str, str]:
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# Generate private key
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private_key = secrets.randbits(256)
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private_key_hex = hex(private_key)[2:].zfill(64)
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# Generate address using Web3
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w3 = Web3()
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account = w3.eth.account.from_key(private_key_hex)
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return private_key_hex, account.address
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@staticmethod
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def sign_transaction(private_key_hex: str, transaction_data: Dict) -> str:
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w3 = Web3()
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# Sign the transaction
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signed_txn = w3.eth.account.sign_transaction(transaction_data, private_key_hex)
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return signed_txn.rawTransaction.hex()
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@staticmethod
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def verify_address(address: str) -> bool:
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try:
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return Web3.is_address(address)
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except Exception:
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return False
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class WalletFactory:
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@staticmethod
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def create_wallet(currency: str) -> Tuple[str, str]:
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currency = currency.upper()
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if currency == 'BTC':
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return BitcoinWallet.generate_wallet()
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elif currency in ['ETH', 'USDT']:
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return EthereumWallet.generate_wallet()
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else:
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raise ValueError(f"Unsupported currency: {currency}")
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@staticmethod
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def sign_transaction(currency: str, private_key: str, transaction_data: Dict) -> str:
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currency = currency.upper()
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if currency == 'BTC':
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return BitcoinWallet.sign_transaction(private_key, transaction_data)
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elif currency in ['ETH', 'USDT']:
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return EthereumWallet.sign_transaction(private_key, transaction_data)
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else:
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raise ValueError(f"Unsupported currency: {currency}")
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@staticmethod
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def verify_address(currency: str, address: str) -> bool:
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currency = currency.upper()
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if currency == 'BTC':
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return BitcoinWallet.verify_address(address)
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elif currency in ['ETH', 'USDT']:
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return EthereumWallet.verify_address(address)
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else:
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return False |