better PIN handling

- avoid overloading of the unblocking command, instead perform resuming
  the pin automatically.
- implemented cache for npa card driver
- added support for eSign PIN verification
- addes support for get pin info cmd

npa/src/card-npa.h

@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2014 Frank Morgner
+ *
+ * This file is part of npa.
+ *
+ * npa is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * npa is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * npa.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _CARD_NPA_H
+#define _CARD_NPA_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "libopensc/opensc.h"
+
+enum {
+    SC_CARD_TYPE_NPA = 42000,
+    SC_CARD_TYPE_NPA_TEST,
+    SC_CARD_TYPE_NPA_ONLINE,
+};
+
+#define NPA_PIN_ID_ESIGN_PIN 0x83
+
+const unsigned char esign_chat[] = {
+    0x7F, 0x4C, 0x0E,
+        0x06, 0x09, 0x04, 0x00, 0x7F, 0x00, 0x07, 0x03, 0x01, 0x02, 0x03,
+        0x53, 0x01, 0x03,
+};
+
+static const unsigned char df_esign_aid[]  = { 0xa0, 0x00, 0x00, 0x01, 0x67, 0x45, 0x53, 0x49, 0x47, 0x4e};
+static const unsigned char df_esign_path[] = { 0x3f, 0x00, 0x50, 0x15, 0x1f, 0xff};
+static const unsigned char ef_cardaccess_path[] = { 0x3f, 0x00, 0x01, 0x1c};
+
+void npa_get_cache(struct sc_card *card,
+        unsigned char pin_id, const unsigned char **pin, size_t *pin_length,
+        unsigned char **ef_cardaccess, size_t *ef_cardaccess_length);
+
+void npa_set_cache(struct sc_card *card,
+        unsigned char pin_id, const unsigned char *pin, size_t pin_length,
+        const unsigned char *ef_cardaccess, size_t ef_cardaccess_length);
+
+#ifdef  __cplusplus
+}
+#endif
+#endif