CCID App: Refactor (#3808)

- Move iso7816 related code to its own folder - Refactor Iso7816Callback into Iso7816Handler - Created new file for CCID commands - Renamed variables according to standard Co-authored-by: あく <alleteam@gmail.com>
2025-12-13 05:19:50 +04:00 · 2024-07-31 16:44:04 -05:00
parent f73d60cba8
commit 53cf700521
12 changed files with 248 additions and 255 deletions
--- a/applications/debug/ccid_test/ccid_test_app_commands.c
+++ b/applications/debug/ccid_test/ccid_test_app_commands.c
@@ -0,0 +1,123 @@
+#include "iso7816/iso7816_t0_apdu.h"
+#include "iso7816/iso7816_response.h"
+
+//Instruction 1: returns an OK response unconditionally
+//APDU example: 0x01:0x01:0x00:0x00
+//response: SW1=0x90, SW2=0x00
+void handle_instruction_01(ISO7816_Response_APDU* response_apdu) {
+    response_apdu->DataLen = 0;
+    iso7816_set_response(response_apdu, ISO7816_RESPONSE_OK);
+}
+
+//Instruction 2: expect command with no body, replies wit with a body with two bytes
+//APDU example: 0x01:0x02:0x00:0x00:0x02
+//response: 'bc' (0x62, 0x63) SW1=0x90, SW2=0x00
+void handle_instruction_02(
+    uint8_t p1,
+    uint8_t p2,
+    uint16_t lc,
+    uint16_t le,
+    ISO7816_Response_APDU* response_apdu) {
+    if(p1 == 0 && p2 == 0 && lc == 0 && le >= 2) {
+        response_apdu->Data[0] = 0x62;
+        response_apdu->Data[1] = 0x63;
+
+        response_apdu->DataLen = 2;
+
+        iso7816_set_response(response_apdu, ISO7816_RESPONSE_OK);
+    } else if(p1 != 0 || p2 != 0) {
+        iso7816_set_response(response_apdu, ISO7816_RESPONSE_WRONG_PARAMETERS_P1_P2);
+    } else {
+        iso7816_set_response(response_apdu, ISO7816_RESPONSE_WRONG_LENGTH);
+    }
+}
+
+//Instruction 3: sends a command with a body with two bytes, receives a response with no bytes
+//APDU example: 0x01:0x03:0x00:0x00:0x02:CA:FE
+//response SW1=0x90, SW2=0x00
+void handle_instruction_03(
+    uint8_t p1,
+    uint8_t p2,
+    uint16_t lc,
+    ISO7816_Response_APDU* response_apdu) {
+    if(p1 == 0 && p2 == 0 && lc == 2) {
+        response_apdu->DataLen = 0;
+        iso7816_set_response(response_apdu, ISO7816_RESPONSE_OK);
+    } else if(p1 != 0 || p2 != 0) {
+        iso7816_set_response(response_apdu, ISO7816_RESPONSE_WRONG_PARAMETERS_P1_P2);
+    } else {
+        iso7816_set_response(response_apdu, ISO7816_RESPONSE_WRONG_LENGTH);
+    }
+}
+
+//instruction 4: sends a command with a body with 'n' bytes, receives a response with 'n' bytes
+//APDU example: 0x01:0x04:0x00:0x00:0x04:0x01:0x02:0x03:0x04:0x04
+//receives (0x01, 0x02, 0x03, 0x04) SW1=0x90, SW2=0x00
+void handle_instruction_04(
+    uint8_t p1,
+    uint8_t p2,
+    uint16_t lc,
+    uint16_t le,
+    const uint8_t* command_apdu_data_buffer,
+    ISO7816_Response_APDU* response_apdu) {
+    if(p1 == 0 && p2 == 0 && lc > 0 && le > 0 && le >= lc) {
+        for(uint16_t i = 0; i < lc; i++) {
+            response_apdu->Data[i] = command_apdu_data_buffer[i];
+        }
+
+        response_apdu->DataLen = lc;
+
+        iso7816_set_response(response_apdu, ISO7816_RESPONSE_OK);
+    } else if(p1 != 0 || p2 != 0) {
+        iso7816_set_response(response_apdu, ISO7816_RESPONSE_WRONG_PARAMETERS_P1_P2);
+    } else {
+        iso7816_set_response(response_apdu, ISO7816_RESPONSE_WRONG_LENGTH);
+    }
+}
+
+void iso7816_answer_to_reset(Iso7816Atr* atr) {
+    //minimum valid ATR: https://smartcard-atr.apdu.fr/parse?ATR=3B+00
+    atr->TS = 0x3B;
+    atr->T0 = 0x00;
+}
+
+void iso7816_process_command(
+    const ISO7816_Command_APDU* command_apdu,
+    ISO7816_Response_APDU* response_apdu) {
+    //example 1: sends a command with no body, receives a response with no body
+    //sends APDU 0x01:0x01:0x00:0x00
+    //receives SW1=0x90, SW2=0x00
+
+    if(command_apdu->CLA == 0x01) {
+        switch(command_apdu->INS) {
+        case 0x01:
+            handle_instruction_01(response_apdu);
+            break;
+        case 0x02:
+            handle_instruction_02(
+                command_apdu->P1,
+                command_apdu->P2,
+                command_apdu->Lc,
+                command_apdu->Le,
+                response_apdu);
+            break;
+        case 0x03:
+            handle_instruction_03(
+                command_apdu->P1, command_apdu->P2, command_apdu->Lc, response_apdu);
+            break;
+        case 0x04:
+            handle_instruction_04(
+                command_apdu->P1,
+                command_apdu->P2,
+                command_apdu->Lc,
+                command_apdu->Le,
+                command_apdu->Data,
+                response_apdu);
+            break;
+        default:
+            iso7816_set_response(response_apdu, ISO7816_RESPONSE_INSTRUCTION_NOT_SUPPORTED);
+        }
+    } else {
+        iso7816_set_response(response_apdu, ISO7816_RESPONSE_CLASS_NOT_SUPPORTED);
+    }
+}