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[hf seos] Fix cmac input length

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This commit is contained in:
Aaron Tulino (Aaronjamt)
2025-11-21 22:58:03 -07:00
parent d29d912fff
commit 89e6e9a7d0
1 changed files with 6 additions and 4 deletions
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client/src/cmdhfseos.c
+6 -4
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@@ -547,6 +547,7 @@ int seos_kdf(bool encryption, uint8_t *masterKey, uint8_t keyslot,
static int select_DF_verify(uint8_t *response, uint8_t response_length, uint8_t *MAC_value, size_t MAC_value_len, int encryption_algorithm, int key_index) {
uint8_t input[response_length - 10];
int input_len = 0;
// Response is an ASN.1 encoded structure
// Extract everything before the 8E tag
@@ -562,8 +563,9 @@ static int select_DF_verify(uint8_t *response, uint8_t response_length, uint8_t
if (i+2+MAC_value_len > response_length) {
goto out;
}
memcpy(input, response, i);
memcpy(MAC_value, response + (i + 2), MAC_value_len);
input_len = i;
memcpy(input, response, input_len);
memcpy(MAC_value, response + (input_len + 2), MAC_value_len);
res = PM3_SUCCESS;
break;
}
@@ -578,11 +580,11 @@ static int select_DF_verify(uint8_t *response, uint8_t response_length, uint8_t
uint8_t cmac[16];
uint8_t MAC_key[24] = {0x00};
memcpy(MAC_key, keys[key_index].privMacKey, 16);
create_cmac(MAC_key, input, cmac, sizeof(input), encryption_algorithm);
create_cmac(MAC_key, input, cmac, input_len, encryption_algorithm);
// PrintAndLogEx(INFO, "--- " _CYAN_("MAC") " ---------------------------");
// PrintAndLogEx(SUCCESS, "MAC Key: "_YELLOW_("%s"), sprint_hex_inrow(MAC_key,sizeof(MAC_key)));
// PrintAndLogEx(SUCCESS, "Message: " _YELLOW_("%s"), sprint_hex_inrow(input,sizeof(input)));
// PrintAndLogEx(SUCCESS, "Message: " _YELLOW_("%s"), sprint_hex_inrow(input,input_len));
if (memcmp(cmac, MAC_value, MAC_value_len) == 0) {
// PrintAndLogEx(SUCCESS, _GREEN_("MAC Verification successful"));