private bool checkNPDHash2(byte[] klicensee, byte[] npd)
{
byte[] xoredKey = new byte[0x10];
ToolsImpl.XOR(xoredKey, klicensee, EDATKeys.npdrm_omac_key2);
byte[] calculated = ToolsImpl.CMAC128(xoredKey, npd, 0, 0x60);
bool result2 = compareBytes(calculated, 0, npd, 0x60, 0x10);
if (result2)
{
Debug.WriteLine("NPD hash 2 is valid (" + ConversionUtils.getHexString(calculated) + ")");
}
return(result2);
}
private bool checkNPDHash1(String filename, byte[] npd)
{
byte[] fileBytes = ConversionUtils.charsToByte(filename.ToCharArray());
byte[] data1 = new byte[0x30 + fileBytes.Length];
ConversionUtils.arraycopy(npd, 0x10, data1, 0, 0x30);
ConversionUtils.arraycopy(fileBytes, 0x00, data1, 0x30, fileBytes.Length);
byte[] hash1 = ToolsImpl.CMAC128(EDATKeys.npdrm_omac_key3, data1, 0, data1.Length);
bool result1 = compareBytes(hash1, 0, npd, 0x50, 0x10);
if (result1)
{
Debug.WriteLine("NPD hash 1 is valid (" + ConversionUtils.getHexString(hash1) + ")");
}
return(result1);
}
public void doInit(int hashFlag, int cryptoFlag, byte[] key, byte[] iv, byte[] hashKey)
{
byte[] calculatedKey = new byte[key.Length];
byte[] calculatedIV = new byte[iv.Length];
byte[] calculatedHash = new byte[hashKey.Length];
getCryptoKeys(cryptoFlag, calculatedKey, calculatedIV, key, iv);
getHashKeys(hashFlag, calculatedHash, hashKey);
setDecryptor(cryptoFlag);
setHash(hashFlag);
Debug.WriteLine("ERK: " + ConversionUtils.getHexString(calculatedKey));
Debug.WriteLine("IV: " + ConversionUtils.getHexString(calculatedIV));
Debug.WriteLine("HASH: " + ConversionUtils.getHexString(calculatedHash));
dec.doInit(calculatedKey, calculatedIV);
hash.doInit(calculatedHash);
}
public int decryptFile(String inFile, String outFile, byte[] devKLic, byte[] keyFromRif)
{
FileStream fin = File.Open(inFile, FileMode.Open);
string[] fn = fin.Name.Split('\\');
NPD[] ptr = new NPD[1]; //Ptr to Ptr
int result = validateNPD(fn[fn.Length - 1], devKLic, ptr, fin); //Validate NPD hashes
if (result < 0)
{
fin.Close();
return(result);
}
NPD npd = ptr[0];
EDATData data = getEDATData(fin); //Get flags, blocksize and file len
byte[] rifkey = getKey(npd, data, devKLic, keyFromRif); //Obtain the key for decryption (result of sc471 or sdatkey)
if (rifkey == null)
{
Debug.WriteLine("ERROR: Key for decryption is missing");
fin.Close();
return(STATUS_ERROR_MISSINGKEY);
}
else
{
Debug.WriteLine("DECRYPTION KEY: " + ConversionUtils.getHexString(rifkey));
}
result = checkHeader(rifkey, data, npd, fin);
if (result < 0)
{
fin.Close();
return(result);
}
FileStream o = File.Open(outFile, FileMode.Create);
result = decryptData(fin, o, npd, data, rifkey);
if (result < 0)
{
fin.Close();
return(result);
}
fin.Close();
o.Close();
return(STATUS_OK);
}
