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Merge pull request #1144 from aveao/emrtd

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emrtd: Account for hash algo quirks
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Philippe Teuwen 2020-12-29 16:49:30 +01:00 • committed by GitHub
commit 03be720277
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1 changed files with 10 additions and 5 deletions
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15
client/src/cmdhfemrtd.c
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@ -111,7 +111,7 @@ static emrtd_dg_t dg_table[] = {
// https://tools.ietf.org/html/rfc3447#page-43
static emrtd_hashalg_t hashalg_table[] = {
// name hash func len len descriptor
{"SHA-1", sha1hash, 20, 9, {0x06, 0x05, 0x2B, 0x0E, 0x03, 0x02, 0x1A, 0x05, 0x00}},
{"SHA-1", sha1hash, 20, 7, {0x06, 0x05, 0x2B, 0x0E, 0x03, 0x02, 0x1A}},
{"SHA-256", sha256hash, 32, 11, {0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01}},
{"SHA-512", sha512hash, 64, 11, {0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03}},
{NULL, NULL, 0, 0, {}}
@ -1551,6 +1551,12 @@ static int emrtd_parse_ef_sod_hash_algo(uint8_t *data, size_t datalen, int *hash
PrintAndLogEx(DEBUG, "hash algo set: %s", sprint_hex_inrow(hashalgoset, hashalgosetlen));
// If last two bytes are 05 00, ignore them.
// https://wf.lavatech.top/ave-but-random/emrtd-data-quirks#EF_SOD
if (hashalgoset[hashalgosetlen - 2] == 0x05 && hashalgoset[hashalgosetlen - 1] == 0x00) {
hashalgosetlen -= 2;
}
for (int hashi = 0; hashalg_table[hashi].name != NULL; hashi++) {
PrintAndLogEx(DEBUG, "trying: %s", hashalg_table[hashi].name);
// We're only interested in checking if the length matches to avoid memory shenanigans
@ -1565,8 +1571,9 @@ static int emrtd_parse_ef_sod_hash_algo(uint8_t *data, size_t datalen, int *hash
}
}
// Return hash algo 0 if we can't find anything
// Return hash algo -1 if we can't find anything
*hashalgo = -1;
PrintAndLogEx(ERR, "Failed to parse hash list (Unknown algo: %s). Hash verification won't be available.", sprint_hex_inrow(hashalgoset, hashalgosetlen));
return PM3_ESOFT;
}
@ -1591,9 +1598,7 @@ static int emrtd_parse_ef_sod_hashes(uint8_t *data, size_t datalen, uint8_t *has
PrintAndLogEx(DEBUG, "hash data: %s", sprint_hex_inrow(emrtdsig, emrtdsiglen));
if (emrtd_parse_ef_sod_hash_algo(emrtdsig, emrtdsiglen, hashalgo) != PM3_SUCCESS) {
PrintAndLogEx(ERR, "Failed to parse hash list (Unknown algo?). Hash verification won't be available.");
}
emrtd_parse_ef_sod_hash_algo(emrtdsig, emrtdsiglen, hashalgo);
if (!emrtd_lds_get_data_by_tag(emrtdsig, emrtdsiglen, hashlist, &hashlistlen, 0x30, 0x00, false, true, 1)) {
PrintAndLogEx(ERR, "Failed to read hash list from EF_SOD.");