crypto_utils.py

# crypto_utils.py
"""
Cryptography utilities for password hashing and username encryption
"""
import bcrypt
import hashlib

def hash_password(password: str) -> str:
    """
    Hash password with bcrypt
    Args:
        password: Plain text password
    Returns:
        Hashed password string
    """
    salt = bcrypt.gensalt(rounds=10)
    hashed = bcrypt.hashpw(password.encode('utf-8'), salt)
    return hashed.decode('utf-8')

def verify_password(password: str, hashed: str) -> bool:
    """
    Verify password against hash
    Args:
        password: Plain text password to verify
        hashed: Stored password hash
    Returns:
        True if password matches, False otherwise
    """
    try:
        return bcrypt.checkpw(password.encode('utf-8'), hashed.encode('utf-8'))
    except Exception as e:
        print(f"Password verification error: {e}")
        return False

def hash_username_for_storage(username: str) -> str:
    """
    Create consistent SHA-256 hash of username for database storage
    Args:
        username: Plain text username
    Returns:
        SHA-256 hash hex string
    """
    return hashlib.sha256(username.lower().encode('utf-8')).hexdigest()

def generate_encryption_key() -> str:
    """
    Generate random encryption key for username encryption
    Returns:
        Random 32-byte hex string
    """
    import secrets
    return secrets.token_hex(32)