PicoHSM always returns bytes().

No need for casting.

Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>

tests/pico-hsm/test_050_cipher.py

@@ -43,11 +43,11 @@ def test_cipher_aes_cipher(device, size):
     encryptor = cipher.encryptor()
     ctA = encryptor.update(MESSAGE) + encryptor.finalize()
     ctB = device.cipher(Algorithm.ALGO_AES_CBC_ENCRYPT, keyid, MESSAGE)
-    assert(bytes(ctB) == ctA)
+    assert(ctB == ctA)
 
     decryptor = cipher.decryptor()
     plA = decryptor.update(ctA) + decryptor.finalize()
     plB = device.cipher(Algorithm.ALGO_AES_CBC_DECRYPT, keyid, ctA)
     device.delete_file(DOPrefixes.KEY_PREFIX, keyid)
-    assert(bytes(plB) == plA)
-    assert(bytes(plB) == MESSAGE)
+    assert(plB == plA)
+    assert(plB == MESSAGE)