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emrtd: Reduce code repetition

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Ave 2020-12-07 01:38:39 +03:00
parent 49e4321382
commit b0fb5bfff6
1 changed files with 23 additions and 60 deletions
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83
client/src/cmdhfemrtd.c
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@ -49,20 +49,16 @@ static uint16_t get_sw(uint8_t *d, uint8_t n) {
return d[n] * 0x0100 + d[n + 1];
}
static int select_file(const char *select_by, const char *file_id, bool activate_field, bool keep_field_on) {
static int exchange_commands(const char *cmd, uint8_t *dataout, int *dataoutlen, bool activate_field, bool keep_field_on) {
uint8_t response[PM3_CMD_DATA_SIZE];
int resplen = 0;
size_t file_id_len = strlen(file_id) / 2;
char cmd[50];
sprintf(cmd, "00%s%s0C%02lu%s", SELECT, select_by, file_id_len, file_id);
PrintAndLogEx(INFO, "Sending: %s", cmd);
uint8_t aSELECT_FILE[80];
int aSELECT_FILE_n = 0;
param_gethex_to_eol(cmd, 0, aSELECT_FILE, sizeof(aSELECT_FILE), &aSELECT_FILE_n);
int res = ExchangeAPDU14a(aSELECT_FILE, aSELECT_FILE_n, activate_field, keep_field_on, response, sizeof(response), &resplen);
uint8_t aCMD[80];
int aCMD_n = 0;
param_gethex_to_eol(cmd, 0, aCMD, sizeof(aCMD), &aCMD_n);
int res = ExchangeAPDU14a(aCMD, aCMD_n, activate_field, keep_field_on, response, sizeof(response), &resplen);
if (res) {
DropField();
return false;
@ -73,9 +69,13 @@ static int select_file(const char *select_by, const char *file_id, bool activate
}
PrintAndLogEx(INFO, "Response: %s", sprint_hex(response, resplen));
// drop sw
memcpy(dataout, &response, resplen - 2);
*dataoutlen = (resplen - 2);
uint16_t sw = get_sw(response, resplen);
if (sw != 0x9000) {
PrintAndLogEx(ERR, "Selecting file failed (%04x - %s).", sw, GetAPDUCodeDescription(sw >> 8, sw & 0xff));
PrintAndLogEx(ERR, "Command %s failed (%04x - %s).", cmd, sw, GetAPDUCodeDescription(sw >> 8, sw & 0xff));
return false;
}
return true;
@ -151,68 +151,31 @@ static int asn1fieldlength(uint8_t *datain, int datainlen) {
return false;
}
static int get_challenge(int length, uint8_t *dataout, int *dataoutlen) {
bool activate_field = false;
bool keep_field_on = true;
static int select_file(const char *select_by, const char *file_id, bool activate_field, bool keep_field_on) {
size_t file_id_len = strlen(file_id) / 2;
// Get data even tho we'll not use it
uint8_t response[PM3_CMD_DATA_SIZE];
int resplen = 0;
char cmd[50];
sprintf(cmd, "00%s%s0C%02lu%s", SELECT, select_by, file_id_len, file_id);
return exchange_commands(cmd, response, &resplen, activate_field, keep_field_on);
}
static int get_challenge(int length, uint8_t *dataout, int *dataoutlen) {
char cmd[50];
sprintf(cmd, "00%s0000%02X", GET_CHALLENGE, length);
PrintAndLogEx(INFO, "Sending: %s", cmd);
uint8_t aGET_CHALLENGE[80];
int aGET_CHALLENGE_n = 0;
param_gethex_to_eol(cmd, 0, aGET_CHALLENGE, sizeof(aGET_CHALLENGE), &aGET_CHALLENGE_n);
int res = ExchangeAPDU14a(aGET_CHALLENGE, aGET_CHALLENGE_n, activate_field, keep_field_on, response, sizeof(response), &resplen);
if (res) {
DropField();
return false;
}
PrintAndLogEx(INFO, "Response: %s", sprint_hex(response, resplen));
// drop sw
memcpy(dataout, &response, resplen - 2);
*dataoutlen = (resplen - 2);
uint16_t sw = get_sw(response, resplen);
if (sw != 0x9000) {
PrintAndLogEx(ERR, "Getting challenge failed (%04x - %s).", sw, GetAPDUCodeDescription(sw >> 8, sw & 0xff));
return false;
}
return true;
return exchange_commands(cmd, dataout, dataoutlen, false, true);
}
static int _read_binary(int offset, int bytes_to_read, uint8_t *dataout, int *dataoutlen) {
bool activate_field = false;
bool keep_field_on = true;
uint8_t response[PM3_CMD_DATA_SIZE];
int resplen = 0;
char cmd[50];
sprintf(cmd, "00%s%04i%02i", READ_BINARY, offset, bytes_to_read);
PrintAndLogEx(INFO, "Sending: %s", cmd);
uint8_t aREAD_BINARY[80];
int aREAD_BINARY_n = 0;
param_gethex_to_eol(cmd, 0, aREAD_BINARY, sizeof(aREAD_BINARY), &aREAD_BINARY_n);
int res = ExchangeAPDU14a(aREAD_BINARY, aREAD_BINARY_n, activate_field, keep_field_on, response, sizeof(response), &resplen);
if (res) {
DropField();
return false;
}
PrintAndLogEx(INFO, "Response: %s", sprint_hex(response, resplen));
// drop sw
memcpy(dataout, &response, resplen - 2);
*dataoutlen = (resplen - 2);
uint16_t sw = get_sw(response, resplen);
if (sw != 0x9000) {
PrintAndLogEx(ERR, "Reading binary failed (%04x - %s).", sw, GetAPDUCodeDescription(sw >> 8, sw & 0xff));
return false;
}
return true;
return exchange_commands(cmd, dataout, dataoutlen, false, true);
}
static int read_file(uint8_t *dataout, int *dataoutlen) {