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emrtd: Parse hashes on EF_SOD

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Ave 2020-12-22 05:52:48 +03:00
commit c3ed99e388
1 changed files with 38 additions and 2 deletions
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40
client/src/cmdhfemrtd.c
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@ -1532,8 +1532,19 @@ static int emrtd_ef_sod_extract_signatures(uint8_t *data, size_t datalen, uint8_
static int emrtd_print_ef_sod_info(uint8_t *data, size_t datalen) {
uint8_t emrtdsig[EMRTD_MAX_FILE_SIZE] = { 0x00 };
uint8_t hashlist[EMRTD_MAX_FILE_SIZE] = { 0x00 };
uint8_t hash[65] = { 0x00 };
size_t hashlen = 0;
uint8_t hashidstr[4] = { 0x00 };
size_t hashidstrlen = 0;
// size_t emrtdsiglen, e_datalen, e_fieldlen = 0;
size_t emrtdsiglen = 0;
size_t hashlistlen = 0;
size_t e_datalen = 0;
size_t e_fieldlen = 0;
size_t offset = 0;
PrintAndLogEx(NORMAL, "");
PrintAndLogEx(INFO, "-------------------- " _CYAN_("EF_SOD") " --------------------");
@ -1541,8 +1552,33 @@ static int emrtd_print_ef_sod_info(uint8_t *data, size_t datalen) {
if (emrtd_ef_sod_extract_signatures(data, datalen, emrtdsig, &emrtdsiglen) != PM3_SUCCESS) {
return false;
}
// TODO: parse this
PrintAndLogEx(INFO, "hash data: %s", sprint_hex_inrow(emrtdsig, emrtdsiglen));
PrintAndLogEx(DEBUG, "hash data: %s", sprint_hex_inrow(emrtdsig, emrtdsiglen));
if (!emrtd_lds_get_data_by_tag(emrtdsig, (int) emrtdsiglen, hashlist, (int *) &hashlistlen, 0x30, 0x00, false, true, 1)) {
PrintAndLogEx(ERR, "Failed to read hash list from EF_SOD.");
return false;
}
PrintAndLogEx(DEBUG, "hash list: %s", sprint_hex_inrow(hashlist, hashlistlen));
while (offset < hashlistlen) {
// Get the length of the element
e_datalen = emrtd_get_asn1_data_length(hashlist + offset, hashlistlen - offset, 1);
// Get the length of the element's length
e_fieldlen = emrtd_get_asn1_field_length(hashlist + offset, hashlistlen - offset, 1);
switch (hashlist[offset]) {
case 0x30:
emrtd_lds_get_data_by_tag(hashlist + offset + e_fieldlen + 1, (int) e_datalen, hashidstr, (int *) &hashidstrlen, 0x02, 0x00, false, false, 0);
emrtd_lds_get_data_by_tag(hashlist + offset + e_fieldlen + 1, (int) e_datalen, hash, (int *) &hashlen, 0x04, 0x00, false, false, 0);
PrintAndLogEx(SUCCESS, "Hash for EF_DG%i: %s", hashidstr[0], sprint_hex_inrow(hash, hashlen));
break;
}
// + 1 for length of ID
offset += 1 + e_datalen + e_fieldlen;
}
return PM3_SUCCESS;
}