It's a major reorganization.

In order to add FIDO2 support, we need to reorganize some USB/CCID calls to specific area (named driver).
Thus, pico-hsm-sdk has two drivers:
- CCID driver implements APDU over USB/CCID ISO-7816 standard procedures.
- HID driver implements APDU over HID.

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

src/apdu.h

@@ -0,0 +1,84 @@
+/*
+ * This file is part of the Pico HSM distribution (https://github.com/polhenarejos/pico-hsm).
+ * Copyright (c) 2022 Pol Henarejos.
+ *
+ * This program 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, version 3.
+ *
+ * This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _APDU_H_
+#define _APDU_H_
+
+#include <stdlib.h>
+#include "pico/stdlib.h"
+
+typedef struct app {
+    const uint8_t *aid;
+    int (*process_apdu)();
+    struct app* (*select_aid)();
+    int (*unload)();
+} app_t;
+
+extern int register_app(app_t * (*)());
+
+#ifdef DEBUG_APDU
+#define DEBUG_PAYLOAD(_p,_s) { \
+    printf("Payload %s (%d bytes):\r\n", #_p,_s);\
+    for (int _i = 0; _i < _s; _i += 16) {\
+        printf("%07Xh : ",(unsigned int)(_i+_p));\
+        for (int _j = 0; _j < 16; _j++) {\
+            if (_j < _s-_i) printf("%02X ",(_p)[_i+_j]);\
+            else printf("   ");\
+            if (_j == 7) printf(" ");\
+            } printf(":  "); \
+        for (int _j = 0; _j < MIN(16,_s-_i); _j++) {\
+            printf("%c",(_p)[_i+_j] == 0x0a || (_p)[_i+_j] == 0x0d ? '\\' : (_p)[_i+_j]);\
+            if (_j == 7) printf(" ");\
+            }\
+            printf("\r\n");\
+        } printf("\r\n"); \
+    }
+#else
+#define DEBUG_PAYLOAD(_p,_s)
+#endif
+
+extern uint8_t num_apps;
+extern app_t apps[4];
+extern app_t *current_app;
+
+struct apdu {
+    uint8_t *header;
+    uint32_t nc;
+    uint32_t ne;
+    uint8_t *data;
+    uint16_t sw;
+    uint8_t *rdata;
+    uint16_t rlen;
+} __packed;
+
+#define CLA(a) a.header[0]
+#define INS(a) a.header[1]
+#define P1(a) a.header[2]
+#define P2(a) a.header[3]
+
+#define res_APDU apdu.rdata
+#define res_APDU_size apdu.rlen
+
+extern struct apdu apdu;
+
+extern uint16_t set_res_sw (uint8_t sw1, uint8_t sw2);
+extern int process_apdu();
+extern size_t apdu_process(const uint8_t *buffer, size_t buffer_size);
+extern void apdu_finish();
+extern size_t apdu_next();
+
+#endif