Adding tests for OpenPGP.

All tests are taken from gnuk. Reader is migrated from pyusb to pyscard.

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

tests/util.py

@@ -0,0 +1,34 @@
+def skip_tag_if_any(tagh, tagl, data):
+    if data == None:
+        return None
+    if len(data) == 0:
+        return b''
+    # No tag, return DATA itself
+    if tagh == 0x00:
+        if tagl != data[0]:
+            return data
+    else:
+        if tagh != data[0]:
+            return data
+        elif tagl != data[1]:
+            raise ValueError(data)
+    data_len_b0 = data[1 if tagh==0 else 2]
+    if data_len_b0 == 0x81:
+        data_len = data[2 if tagh==0 else 3]
+    elif data_len_b0 == 0x82:
+        data_len = (data[2 if tagh==0 else 3] << 8)| data[3 if tagh==0 else 4]
+    else:
+        data_len = data_len_b0
+    return data[len(data)-data_len:]
+
+def get_data_object(card, tag):
+    tagh = tag >> 8
+    tagl = tag & 0xff
+    result = card.cmd_get_data(tagh, tagl)
+    if card.is_yubikey:
+        return skip_tag_if_any(tagh, tagl, result)
+    else:
+        return result
+
+def check_null(data_object):
+    return data_object == None or len(data_object) == 0