import os
import bcrypt

# Helper functions
def check_password(provided_password, stored_hash):
    return bcrypt.checkpw(provided_password.encode(), stored_hash)

def validate_login(username, password):
    # Retrieve user's hashed password from environment variables
    user_hash = os.getenv(username.upper() + '_HASH')  # Assumes an env var like 'USER1_HASH'
    if user_hash:
        return check_password(password, user_hash.encode())
    return False