def bundle()

in fxa/crypto.py [0:0]

• 7 lines of code
• 3 McCabe index (conditional complexity)

def bundle(key, namespace, payload):
    """Encrypt a response bundle using the given key."""
    # Derive enough key material for HMAC-check and encryption.
    size = 32 + len(payload)
    key_material = derive_key(key, namespace, size)
    # XOR-encrypt the payload using the derived key.
    xor_key = key_material[32:]
    ciphertext = xor(xor_key, payload)
    # Append an HMAC using the derived key.
    hmac_key = key_material[:32]
    return ciphertext + calculate_hmac(hmac_key, ciphertext)