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hf mfdes auth - textual

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iceman1001 2020-11-06 23:52:11 +01:00
commit 427e7c02e8
1 changed files with 40 additions and 6 deletions
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44
client/src/cmdhfmfdes.c
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@ -348,6 +348,20 @@ typedef struct {
static int CmdHelp(const char *Cmd); static int CmdHelp(const char *Cmd);
static const char *getEncryptionAlgoStr(uint8_t algo) {
switch(algo) {
case MFDES_ALGO_AES :
return "AES";
case MFDES_ALGO_3DES :
return "3DES";
case MFDES_ALGO_DES :
return "DES";
case MFDES_ALGO_3K3DES :
return "3K3DES";
default :
return "";
}
}
/* /*
The 7 MSBits (= n) code the storage size itself based on 2^n, The 7 MSBits (= n) code the storage size itself based on 2^n,
the LSBit is set to '0' if the size is exactly 2^n the LSBit is set to '0' if the size is exactly 2^n
@ -1114,6 +1128,12 @@ static int handler_desfire_freemem(uint32_t *free_mem) {
} }
static int mifare_desfire_change_key(uint8_t key_no, uint8_t *new_key, uint8_t new_algo, uint8_t *old_key, uint8_t old_algo, uint8_t aes_version) { static int mifare_desfire_change_key(uint8_t key_no, uint8_t *new_key, uint8_t new_algo, uint8_t *old_key, uint8_t old_algo, uint8_t aes_version) {
if (new_key == NULL || old_key == NULL) {
return PM3_EINVARG;
}
// AID == 000000 6bits LSB needs to be 0
key_no &= 0x0F; key_no &= 0x0F;
/* /*
@ -1121,24 +1141,34 @@ static int mifare_desfire_change_key(uint8_t key_no, uint8_t *new_key, uint8_t n
* changing the card master key to one of them require a key_no tweak. * changing the card master key to one of them require a key_no tweak.
*/ */
if (0x000000 == tag->selected_application) { if (0x000000 == tag->selected_application) {
// PICC master key, 6bits LSB needs to be 0
key_no = 0x00;
// PICC master key, keyalgo specific 2bit MSB
switch (new_algo) { switch (new_algo) {
case MFDES_ALGO_DES: case MFDES_ALGO_DES:
break; case MFDES_ALGO_3DES:
break; // 00xx xxx
case MFDES_ALGO_3K3DES: case MFDES_ALGO_3K3DES:
key_no |= 0x40; key_no |= 0x40; // 01xx xxx
break; break;
case MFDES_ALGO_AES: case MFDES_ALGO_AES:
key_no |= 0x80; key_no |= 0x80; // 10xx xxx
break; break;
} }
} }
uint8_t data[24 * 4] = {key_no}; // Variable length ciphered key data 26-42 bytes plus padding..
uint8_t data[64] = {key_no};
sAPDU apdu = {0x90, MFDES_CHANGE_KEY, 0x00, 0x00, 0x01, data}; // 0xC4 sAPDU apdu = {0x90, MFDES_CHANGE_KEY, 0x00, 0x00, 0x01, data}; // 0xC4
uint8_t new_key_length = 16; uint8_t new_key_length = 16;
switch (new_algo) { switch (new_algo) {
case MFDES_ALGO_DES: case MFDES_ALGO_DES:
new_key_length = 8;
break;
case MFDES_ALGO_3DES:
case MFDES_ALGO_AES: case MFDES_ALGO_AES:
new_key_length = 16; new_key_length = 16;
break; break;
@ -1223,7 +1253,7 @@ static int mifare_desfire_change_key(uint8_t key_no, uint8_t *new_key, uint8_t n
tag->session_key = NULL; tag->session_key = NULL;
} }
return 0; return PM3_SUCCESS;
} }
// --- GET SIGNATURE // --- GET SIGNATURE
@ -3909,6 +3939,10 @@ static int CmdHF14ADesChangeKey(const char *Cmd) {
return PM3_EINVARG; return PM3_EINVARG;
} }
PrintAndLogEx(INFO, "changing key number 0x%02x", cmdKeyNo);
PrintAndLogEx(INFO, "old key: %s (%s)", sprint_hex_inrow(key, keylen), getEncryptionAlgoStr(cmdAuthAlgo));
PrintAndLogEx(INFO, "new key: %s (%s)", sprint_hex_inrow(newkey, newkeylen), getEncryptionAlgoStr(newcmdAuthAlgo));
int error = mifare_desfire_change_key(cmdKeyNo, newkey, newcmdAuthAlgo, key, cmdAuthAlgo, aesversion); int error = mifare_desfire_change_key(cmdKeyNo, newkey, newcmdAuthAlgo, key, cmdAuthAlgo, aesversion);
if (error == PM3_SUCCESS) { if (error == PM3_SUCCESS) {
PrintAndLogEx(SUCCESS, " Successfully changed key."); PrintAndLogEx(SUCCESS, " Successfully changed key.");