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emrtd: Split DG hash calc into emrtd_calc_dg_hash

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Ave 2020-12-29 04:01:15 +03:00
commit bc8c52931b
1 changed files with 13 additions and 12 deletions
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25
client/src/cmdhfemrtd.c
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@ -1532,6 +1532,7 @@ static int emrtd_ef_sod_extract_signatures(uint8_t *data, size_t datalen, uint8_
return PM3_SUCCESS;
}
// https://security.stackexchange.com/questions/131241/where-do-magic-constants-for-signature-algorithms-come-from
static const uint8_t emrtd_hashalgo_sha256[] = {0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01};
static const uint8_t emrtd_hashalgo_sha512[] = {0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03};
@ -1615,6 +1616,16 @@ static int emrtd_parse_ef_sod_hashes(uint8_t *data, size_t datalen, uint8_t *has
return PM3_SUCCESS;
}
static void emrtd_calc_dg_hash(uint8_t *data, size_t datalen, uint8_t *hash_out, int hash_algo) {
memset(hash_out, 0, 64);
if (hash_algo == 1) {
sha256hash(data, datalen, hash_out);
} else if (hash_algo == 3) {
sha512hash(data, datalen, hash_out);
}
}
int infoHF_EMRTD(char *documentnumber, char *dob, char *expiry, bool BAC_available) {
uint8_t response[EMRTD_MAX_FILE_SIZE] = { 0x00 };
int resplen = 0;
@ -1694,12 +1705,7 @@ int infoHF_EMRTD(char *documentnumber, char *dob, char *expiry, bool BAC_availab
dg->parser(response, resplen);
// Check file hash
memset(hash_out, 0, 64);
if (hash_algo == 1) {
sha256hash(response, resplen, hash_out);
} else if (hash_algo == 3) {
sha512hash(response, resplen, hash_out);
}
emrtd_calc_dg_hash(response, resplen, hash_out, hash_algo);
if (memcmp(dg_hashes[dg->dgnum], hash_out, 64) == 0) {
PrintAndLogEx(SUCCESS, _GREEN_("Hash verification passed for EF_DG%i."), dg->dgnum);
@ -1785,12 +1791,7 @@ int infoHF_EMRTD_offline(const char *path) {
dg->parser(data, datalen);
// Check file hash
memset(hash_out, 0, 64);
if (hash_algo == 1) {
sha256hash(data, datalen, hash_out);
} else if (hash_algo == 3) {
sha512hash(data, datalen, hash_out);
}
emrtd_calc_dg_hash(data, datalen, hash_out, hash_algo);
if (memcmp(dg_hashes[dg->dgnum], hash_out, 64) == 0) {
PrintAndLogEx(SUCCESS, _GREEN_("Hash verification passed for EF_DG%i."), dg->dgnum);