private bool CryptHeaderCik(bool encrypt)
{
if ((!encrypt && CikIsDecrypted) || IsXvcFile)
{
CikIsDecrypted = true;
return(true);
}
if (!OdkKeyLoaded)
{
return(false);
}
var cipher = new AesCipher(OdkKey);
if (encrypt)
{
cipher.EncryptBlock(Header.EncryptedCIK, 0, 0x10, Header.EncryptedCIK, 0);
cipher.EncryptBlock(Header.EncryptedCIK, 0x10, 0x10, Header.EncryptedCIK, 0x10);
}
else
{
cipher.DecryptBlock(Header.EncryptedCIK, 0, 0x10, Header.EncryptedCIK, 0);
cipher.DecryptBlock(Header.EncryptedCIK, 0x10, 0x10, Header.EncryptedCIK, 0x10);
}
CikIsDecrypted = !encrypt;
return(true);
}
static byte[] CryptBlock(bool encrypt, byte[] data, int dataOffset, int dataLength, byte[] iv, AesCipher cipher)
{
var newData = new byte[dataLength];
//if (!encrypt)
for (int i = 0; i < dataLength; i++)
{
newData[i] = (byte)(data[dataOffset + i] ^ iv[i % iv.Length]);
}
var cryptData = new byte[dataLength];
if (encrypt)
{
cipher.EncryptBlock(newData, 0, dataLength, cryptData, 0);
}
else
{
cipher.DecryptBlock(newData, 0, dataLength, cryptData, 0);
}
for (int i = 0; i < dataLength; i++)
{
cryptData[i] = (byte)(cryptData[i] ^ iv[i % iv.Length]);
}
return(cryptData);
}
private void CryptHeaderCik(bool encrypt)
{
if ((!encrypt && CikIsDecrypted) || IsXvcFile)
{
CikIsDecrypted = true;
return;
}
if (!OdkKeyLoaded)
return;
var cipher = new AesCipher(OdkKey);
if (encrypt)
{
cipher.EncryptBlock(Header.EncryptedCIK, 0, 0x10, Header.EncryptedCIK, 0);
cipher.EncryptBlock(Header.EncryptedCIK, 0x10, 0x10, Header.EncryptedCIK, 0x10);
}
else
{
cipher.DecryptBlock(Header.EncryptedCIK, 0, 0x10, Header.EncryptedCIK, 0);
cipher.DecryptBlock(Header.EncryptedCIK, 0x10, 0x10, Header.EncryptedCIK, 0x10);
}
CikIsDecrypted = !encrypt;
}
