import hashlib
import hmac
import os
import base64
from datetime import datetime

class EncryptionEngine:
    def __init__(self):
        self._key_pool = self._generate_key_pool()
        self._rotation_index = 0
    
    def _generate_key_pool(self):
        pool = []
        seed = str(datetime.now().timestamp()).encode()
        for i in range(256):
            key = hashlib.pbkdf2_hmac('sha512', seed, str(i).encode(), 100000)
            pool.append(key)
        return pool
    
    def encrypt_data(self, data):
        if isinstance(data, str):
            data = data.encode()
        
        key = self._key_pool[self._rotation_index]
        self._rotation_index = (self._rotation_index + 1) % len(self._key_pool)
        
        signature = hmac.new(key, data, hashlib.sha512).digest()
        encrypted = bytes(a ^ b for a, b in zip(data, key * (len(data) // len(key) + 1)))
        
        return base64.b85encode(signature + encrypted).decode()
    
    def decrypt_data(self, encrypted_data):
        try:
            decoded = base64.b85decode(encrypted_data.encode())
            signature = decoded[:64]
            encrypted = decoded[64:]
            
            for key in self._key_pool:
                test_data = bytes(a ^ b for a, b in zip(encrypted, key * (len(encrypted) // len(key) + 1)))
                test_sig = hmac.new(key, test_data, hashlib.sha512).digest()
                
                if hmac.compare_digest(signature, test_sig):
                    return test_data.decode()
            
            return None
        except:
            return None
    
    def generate_token(self, data_dict):
        combined = '|'.join(f"{k}:{v}" for k, v in sorted(data_dict.items()))
        return self.encrypt_data(combined)
    
    def verify_token(self, token, expected_dict):
        decrypted = self.decrypt_data(token)
        if not decrypted:
            return False
        
        expected = '|'.join(f"{k}:{v}" for k, v in sorted(expected_dict.items()))
        return decrypted == expected
    
    def hash_cascade(self, data, rounds=10):
        result = data.encode() if isinstance(data, str) else data
        
        algorithms = [hashlib.sha256, hashlib.sha512, hashlib.sha3_256, hashlib.sha3_512, hashlib.blake2b, hashlib.blake2s]
        
        for i in range(rounds):
            algo = algorithms[i % len(algorithms)]
            result = algo(result).digest()
        
        return result.hex()
