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* companion: can now sign arbitrary data (up to 8K)

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This commit is contained in:
Scott Powell
2025-03-15 21:41:44 +11:00
parent 27aa7a7bb0
commit 6056c303c1
1 changed files with 42 additions and 0 deletions
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42
examples/companion_radio/main.cpp
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@@ -171,6 +171,9 @@ static uint32_t _atoi(const char* sp) {
#define CMD_GET_CONTACT_BY_KEY 30
#define CMD_GET_CHANNEL 31
#define CMD_SET_CHANNEL 32
#define CMD_SIGN_START 33
#define CMD_SIGN_DATA 34
#define CMD_SIGN_FINISH 35
#define RESP_CODE_OK 0
#define RESP_CODE_ERR 1
@@ -190,6 +193,8 @@ static uint32_t _atoi(const char* sp) {
#define RESP_CODE_DISABLED 15
// ... _V3 stuff in here
#define RESP_CODE_CHANNEL_INFO 18 // a reply to CMD_GET_CHANNEL
#define RESP_CODE_SIGN_START 19
#define RESP_CODE_SIGNATURE 20
// these are _pushed_ to client app at any time
#define PUSH_CODE_ADVERT 0x80
@@ -204,6 +209,8 @@ static uint32_t _atoi(const char* sp) {
/* -------------------------------------------------------------------------------------- */
#define MAX_SIGN_DATA_LEN (8*1024) // 8K
struct NodePrefs { // persisted to file
float airtime_factor;
char node_name[32];
@@ -236,6 +243,8 @@ class MyMesh : public BaseChatMesh {
uint32_t _active_ble_pin;
bool _iter_started;
uint8_t app_target_ver;
uint8_t* sign_data;
uint32_t sign_data_len;
uint8_t cmd_frame[MAX_FRAME_SIZE+1];
uint8_t out_frame[MAX_FRAME_SIZE+1];
@@ -696,6 +705,7 @@ public:
app_target_ver = 0;
_identity_store = NULL;
pending_login = pending_status = 0;
sign_data = NULL;
// defaults
memset(&_prefs, 0, sizeof(_prefs));
@@ -1259,6 +1269,38 @@ public:
} else {
writeErrFrame();
}
} else if (cmd_frame[0] == CMD_SIGN_START) {
out_frame[0] = RESP_CODE_SIGN_START;
out_frame[1] = 0; // reserved
uint32_t len = MAX_SIGN_DATA_LEN;
memcpy(&out_frame[2], &len, 4);
_serial->writeFrame(out_frame, 6);
if (sign_data) {
free(sign_data);
}
sign_data = (uint8_t *) malloc(MAX_SIGN_DATA_LEN);
sign_data_len = 0;
} else if (cmd_frame[0] == CMD_SIGN_DATA && len > 1) {
if (sign_data_len + (len - 1) > MAX_SIGN_DATA_LEN) {
writeErrFrame(); // error: too long
} else {
memcpy(&sign_data[sign_data_len], &cmd_frame[1], len - 1);
sign_data_len += (len - 1);
writeOKFrame();
}
} else if (cmd_frame[0] == CMD_SIGN_FINISH) {
if (sign_data) {
self_id.sign(&out_frame[1], sign_data, sign_data_len);
free(sign_data); // don't need sign_data now
sign_data = NULL;
out_frame[0] = RESP_CODE_SIGNATURE;
_serial->writeFrame(out_frame, 1 + SIGNATURE_SIZE);
} else {
writeErrFrame();
}
} else {
writeErrFrame();
MESH_DEBUG_PRINTLN("ERROR: unknown command: %02X", cmd_frame[0]);