"""HSM Manager for PIN, CVV, key management""" import pkcs11...

Prompt

"""HSM Manager for PIN, CVV, key management""" import pkcs11 from pkcs11 import Mechanism, KeyType, ObjectClass, Attribute from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes from cryptography.hazmat.backends import default_backend import struct import hashlib import secrets from .config import settings import logging logger = logging.getLogger(__name__) class HSMManager: def __init__(self): self.lib = None self.session = None self.zmk = None # Zone Master Key self.zpk = None # Zone PIN Key self.zak = None # Zone Authentication Key self.cvk = None # Card Verification Key async def initialize(self): """Initialize HSM connection""" try: self.lib = pkcs11.lib(settings.HSM_LIB_PATH) token = self.lib.get_token(slot=settings.HSM_SLOT) self.session = token.open(user_pin=settings.HSM_PIN, rw=True) # Generate or retrieve master keys await self._initialize_keys() logger.info("HSM initialized successfully") except Exception as e: logger.error(f"HSM initialization failed: {e}") # Fallback to software simulation for development self._initialize_software_hsm() def _initialize_software_hsm(self): """Software HSM simulation for development""" logger.warning("Using software HSM simulation") self.zmk = secrets.token_bytes(32) self.zpk = secrets.token_bytes(32) self.zak = secrets.token_bytes(32) self.cvk = secrets.token_bytes(32) async def _initialize_keys(self): """Initialize or retrieve HSM keys""" # Try to find existing keys try: self.zmk = list(self.session.get_objects({ Attribute.CLASS: ObjectClass.SECRET_KEY, Attribute.LABEL: 'ZMK' }))[0] except (IndexError, AttributeError): # Generate new ZMK self.zmk = self.session.generate_key( KeyType.AES, 256, label='ZMK', store=True, capabilities=pkcs11.Mechanism.ENCRYPT | pkcs11.Mechanism.DECRYPT ) # Same for other keys try: self.zpk = list(self.session.get_objects({ Attribute.CLASS: ObjectClass.SECRET_KEY, Attribute.LABEL: 'ZPK' }))[0] except (IndexError, AttributeError): self.zpk = self.session.generate_key( KeyType.AES, 256, label='ZPK', store=True, capabilities=pkcs11.Mechanism.ENCRYPT | pkcs11.Mechanism.DECRYPT ) try: self.cvk = list(self.session.get_objects({ Attribute.CLASS: ObjectClass.SECRET_KEY, Attribute.LABEL: 'CVK' }))[0] except (IndexError, AttributeError): self.cvk = self.session.generate_key( KeyType.AES, 256, label='CVK', store=True, capabilities=pkcs11.Mechanism.ENCRYPT | pkcs11.Mechanism.DECRYPT ) def verify_pin(self, pan: str, encrypted_pin: bytes) -> bool: """Verify PIN using HSM""" try: if self.session: # HSM PIN verification decrypted = self.zpk.decrypt(encrypted_pin, mechanism=Mechanism.AES_CBC_PAD) # Verify PIN format and length return len(decrypted) >= 4 and len(decrypted) <= 12 else: # Software simulation return self._software_verify_pin(pan, encrypted_pin) except Exception as e: logger.error(f"PIN verification failed: {e}") return False def _software_verify_pin(self, pan: str, encrypted_pin: bytes) -> bool: """Software PIN verification""" try: cipher = Cipher( algorithms.AES(self.zpk), modes.CBC(b'\x00' * 16), backend=default_backend() ) decryptor = cipher.decryptor() decrypted = decryptor.update(encrypted_pin) + decryptor.finalize() return len(decrypted) >= 4 except: return False def generate_cvv(self, pan: str, expiry: str, service_code: str = "101") -> str: """Generate CVV/CVV2""" # CVV generation using CVK data = f"{pan}{expiry}{service_code}".encode() if self.session: try: encrypted = self.cvk.encrypt(data, mechanism=Mechanism.AES_ECB) cvv_value = int.from_bytes(encrypted[:4], 'big') % 1000 return f"{cvv_value:03d}" except: pass # Software fallback cipher = Cipher( algorithms.AES(self.cvk), modes.ECB(), backend=default_backend() ) encryptor = cipher.encryptor() padded = data + b'\x00' * (16 - len(data) % 16) encrypted = encryptor.update(padded) + encryptor.finalize() cvv_value = int.from_bytes(encrypted[:4], 'big') % 1000 return f"{cvv_value:03d}" def verify_cvv(self, pan: str, expiry: str, cvv: str, service_code: str = "101") -> bool: """Verify CVV/CVV2""" generated_cvv = self.generate_cvv(pan, expiry, service_code) return generated_cvv == cvv def generate_arqc(self, transaction_data: bytes) -> bytes: """Generate ARQC (Authorization Request Cryptogram)""" if self.session: try: return self.zak.encrypt(transaction_data, mechanism=Mechanism.AES_CBC_PAD) except: pass # Software fallback cipher = Cipher( algorithms.AES(self.zak), modes.CBC(b'\x00' * 16), backend=default_backend() ) encryptor = cipher.encryptor() padded = transaction_data + b'\x00' * (16 - len(transaction_data) % 16) return encryptor.update(padded) + encryptor.finalize() def generate_arpc(self, arqc: bytes, response_code: str) -> bytes: """Generate ARPC (Authorization Response Cryptogram)""" response_data = arqc + response_code.encode() if self.session: try: return self.zak.encrypt(response_data, mechanism=Mechanism.AES_CBC_PAD) except: pass # Software fallback cipher = Cipher( algorithms.AES(self.zak), modes.CBC(b'\x00' * 16), backend=default_backend() ) encryptor = cipher.encryptor() padded = response_data + b'\x00' * (16 - len(response_data) % 16) return encryptor.update(padded) + encryptor.finalize() def encrypt_pin_block(self, pin: str, pan: str) -> bytes: """Encrypt PIN block (ISO Format 0)""" # Create PIN block pin_block = f"0{len(pin)}{pin}{'F' * (14 - len(pin))}" pan_block = "0000" + pan[-13:-1] # XOR operation pin_int = int(pin_block, 16) pan_int = int(pan_block, 16) xor_result = pin_int ^ pan_int clear_pin_block = xor_result.to_bytes(8, 'big') if self.session: try: return self.zpk.encrypt(clear_pin_block, mechanism=Mechanism.AES_ECB) except: pass # Software fallback cipher = Cipher( algorithms.AES(self.zpk), modes.ECB(), backend=default_backend() ) encryptor = cipher.encryptor() return encryptor.update(clear_pin_block) + encryptor.finalize() async def cleanup(self): """Cleanup HSM session""" if self.session: self.session.close() logger.info("HSM session closed") def is_initialized(self) -> bool: """Check if HSM is initialized""" return self.zpk is not None and self.cvk is not None Send back the complete code with all the fixes. Fix each of the listed errors one by one, making sure to actually correct them so that there are 0 errors remaining. Keep the original imports, since the files exist. Write out every single character; do not abbreviate anything. Fix every error. There must be exactly one file. Do not write anything else; just output the complete code, and it must not contain any comments. Never, under any circumstances, use simplified, substitute, dummy, simulated, or fake code. Write the entire file as complete, unabridged, production-ready code in a single code block. It must be 100% error-free, a complete, error-free file, and must be submitted as a downloadable file. These requirements are mandatory and must be strictly adhered to. If no list of errors is provided, you must find all the errors and fix them. If there were comments in the original code, delete them. And most importantly: YOU MUST NEVER SIMPLIFY!