int BootDecryptEEPROM(EEPROMDATA *eeprom) {
BYTE baKeyHash[20];
BYTE baDataHashConfirm[20];
BYTE baEepromDataLocalCopy[0x30];
struct rc4_key RC4_key;
int version = 0;
int counter;
int n,f;
// Static Version change not included yet
for (counter=9;counter<13;counter++)
{
memset(&RC4_key,0,sizeof(rc4_key));
memcpy(&baEepromDataLocalCopy[0], eeprom, 0x30);
// Calculate the Key-Hash
HMAC_hdd_calculation(counter, baKeyHash, &baEepromDataLocalCopy[0], 20, NULL);
//initialize RC4 key
rc4_prepare_key(baKeyHash, 20, &RC4_key);
//decrypt data (from eeprom) with generated key
rc4_crypt(&baEepromDataLocalCopy[20],8,&RC4_key); //confounder of some kind?
rc4_crypt(&baEepromDataLocalCopy[28],20,&RC4_key); //"real" data
// Calculate the Confirm-Hash
HMAC_hdd_calculation(counter, baDataHashConfirm, &baEepromDataLocalCopy[20], 8, &baEepromDataLocalCopy[28], 20, NULL);
f=0;
for(n=0;n<0x14;n++) {
if(baEepromDataLocalCopy[n]!=baDataHashConfirm[n]) f=1;
}
if (f==0) {
// Confirm Hash is correct
// Copy actual Xbox Version to Return Value
version=counter;
// exits the loop
break;
}
}
//copy out HDKey
memcpy(eeprom,&baEepromDataLocalCopy[0],0x30);
return version;
}
u32 BootHddKeyGenerateEepromKeyData(
u8 *pbEeprom_data,
u8 *pbResult
) {
u8 baKeyHash[20];
u8 baDataHashConfirm[20];
u8 baEepromDataLocalCopy[0x30];
struct rc4_key RC4_key;
int version = 0;
int counter;
// Static Version change not included yet
for (counter=9;counter<13;counter++)
{
memset(&RC4_key,0,sizeof(rc4_key));
memcpy(&baEepromDataLocalCopy[0], pbEeprom_data, 0x30);
// Calculate the Key-Hash
HMAC_hdd_calculation(counter, baKeyHash, &baEepromDataLocalCopy[0], 20, NULL);
//initialize RC4 key
rc4_prepare_key(baKeyHash, 20, &RC4_key);
//decrypt data (from eeprom) with generated key
rc4_crypt(&baEepromDataLocalCopy[20],8,&RC4_key); //confounder of some kind?
rc4_crypt(&baEepromDataLocalCopy[28],20,&RC4_key); //"real" data
// Calculate the Confirm-Hash
HMAC_hdd_calculation(counter, baDataHashConfirm, &baEepromDataLocalCopy[20], 8, &baEepromDataLocalCopy[28], 20, NULL);
if (!memcmp(baEepromDataLocalCopy,baDataHashConfirm,0x14)) {
// Confirm Hash is correct
// Copy actual Xbox Version to Return Value
version=counter;
// exits the loop
break;
}
}
//copy out HDKey
memcpy(pbResult,&baEepromDataLocalCopy[28],16);
return version;
}