Move cmd functions to separate files.

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

src/openpgp/cmd_get_data.c

@@ -0,0 +1,91 @@
+/*
+ * This file is part of the Pico OpenPGP distribution (https://github.com/polhenarejos/pico-openpgp).
+ * 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/>.
+ */
+
+#include "openpgp.h"
+#include "asn1.h"
+
+int cmd_get_data() {
+    if (apdu.nc > 0) {
+        return SW_WRONG_LENGTH();
+    }
+    uint16_t fid = (P1(apdu) << 8) | P2(apdu);
+    file_t *ef;
+    if (!(ef = search_by_fid(fid, NULL, SPECIFY_EF))) {
+        return SW_REFERENCE_NOT_FOUND();
+    }
+    if (!authenticate_action(ef, ACL_OP_READ_SEARCH)) {
+        return SW_SECURITY_STATUS_NOT_SATISFIED();
+    }
+    if (currentEF && (currentEF->fid & 0x1FF0) == (fid & 0x1FF0)) { //previously selected
+        ef = currentEF;
+    }
+    else {
+        select_file(ef);
+    }
+    if (ef->data) {
+        uint16_t fids[] = { 1, fid };
+        uint16_t data_len = parse_do(fids, 1);
+        uint8_t *p = NULL;
+        uint16_t tg = 0;
+        uint16_t tg_len = 0;
+        asn1_ctx_t ctxi;
+        asn1_ctx_init(res_APDU, data_len, &ctxi);
+        if (walk_tlv(&ctxi, &p, &tg, &tg_len, NULL)) {
+            uint8_t dec = 2;
+            if ((tg & 0x1f) == 0x1f) {
+                dec++;
+            }
+            if ((res_APDU[dec - 1] & 0xF0) == 0x80) {
+                dec += (res_APDU[dec - 1] & 0x0F);
+            }
+            if (tg_len + dec == data_len) {
+                memmove(res_APDU, res_APDU + dec, data_len - dec);
+                data_len -= dec;
+                res_APDU_size -= dec;
+            }
+        }
+        //if (apdu.ne > data_len)
+        //    apdu.ne = data_len;
+    }
+    return SW_OK();
+}
+
+int cmd_get_next_data() {
+    file_t *ef = NULL;
+    if (apdu.nc > 0) {
+        return SW_WRONG_LENGTH();
+    }
+    if (!currentEF) {
+        return SW_RECORD_NOT_FOUND();
+    }
+    uint16_t fid = (P1(apdu) << 8) | P2(apdu);
+    if (!(ef = search_by_fid(fid, NULL, SPECIFY_EF))) {
+        return SW_REFERENCE_NOT_FOUND();
+    }
+    if (!authenticate_action(ef, ACL_OP_UPDATE_ERASE)) {
+        return SW_SECURITY_STATUS_NOT_SATISFIED();
+    }
+    if ((currentEF->fid & 0x1FF0) != (fid & 0x1FF0)) {
+        return SW_WRONG_P1P2();
+    }
+    fid = currentEF->fid + 1; //curentEF contains private DO. so, we select the next one
+    if (!(ef = search_by_fid(fid, NULL, SPECIFY_EF))) {
+        return SW_REFERENCE_NOT_FOUND();
+    }
+    select_file(ef);
+    return cmd_get_data();
+}