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hf mfdes auth - textual

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This commit is contained in:
iceman1001 2020-11-06 23:52:11 +01:00
commit 427e7c02e8
1 changed files with 40 additions and 6 deletions
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46
client/src/cmdhfmfdes.c
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@ -348,6 +348,20 @@ typedef struct {
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 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) {
if (new_key == NULL || old_key == NULL) {
return PM3_EINVARG;
}
// AID == 000000 6bits LSB needs to be 0
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.
*/
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) {
case MFDES_ALGO_DES:
break;
case MFDES_ALGO_3DES:
break; // 00xx xxx
case MFDES_ALGO_3K3DES:
key_no |= 0x40;
key_no |= 0x40; // 01xx xxx
break;
case MFDES_ALGO_AES:
key_no |= 0x80;
key_no |= 0x80; // 10xx xxx
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
uint8_t new_key_length = 16;
switch (new_algo) {
case MFDES_ALGO_DES:
new_key_length = 8;
break;
case MFDES_ALGO_3DES:
case MFDES_ALGO_AES:
new_key_length = 16;
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;
}
return 0;
return PM3_SUCCESS;
}
// --- GET SIGNATURE
@ -3908,7 +3938,11 @@ static int CmdHF14ADesChangeKey(const char *Cmd) {
PrintAndLogEx(WARNING, "New key must include %d HEX symbols", keylength);
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);
if (error == PM3_SUCCESS) {
PrintAndLogEx(SUCCESS, " Successfully changed key.");