public static GPKeySet Diversify(GPKeySet keys, byte[] diversification_data, Diversification mode, int scp)
{
try
{
GPKeySet result = new GPKeySet();
//Cipher cipher = Cipher.getInstance("DESede/ECB/NoPadding");
foreach (KeySessionType v in KeyTypeList.Values)
{
if (v == KeySessionType.RMAC)
{
continue;
}
byte[] kv = null;
// shift around and fill initialize update data as required.
if (mode == Diversification.VISA2)
{
kv = FillVisa(diversification_data, v);
}
else if (mode == Diversification.EMV)
{
kv = FillEmv(diversification_data, v);
}
// Encrypt with current master key
//cipher.init(Cipher.ENCRYPT_MODE, keys.getKey(v).getKey(Type.DES3));
//byte[] keybytes = cipher.doFinal(kv);
byte[] keybytes = GPCrypto.DoEncrypt_DES3_ECB(keys.GetKey(v).GetKey(KeyType.DES3).GetEncoded(), kv);
// Replace the key, possibly changing type. G&D SCE 6.0 uses EMV 3DES and resulting keys
// must be interpreted as AES-128
GPKey nk = new GPKey(keybytes, scp == 3 ? KeyType.AES : KeyType.DES3);
result.SetKey(v, nk);
}
return(result);
}
//catch (BadPaddingException e)
//{
// throw new Exception("Diversification failed.", e);
//}
//catch (InvalidKeyException e)
//{
// throw new Exception("Diversification failed.", e);
//}
//catch (IllegalBlockSizeException e)
//{
// throw new Exception("Diversification failed.", e);
//}
//catch (NoSuchAlgorithmException e)
//{
// throw new Exception("Diversification failed.", e);
//}
//catch (NoSuchPaddingException e)
//{
// throw new Exception("Diversification failed.", e);
//}
catch (Exception e)
{
throw new Exception("Diversification failed.", e);
}
}
private GPKeySet DeriveSessionKeysSCP01(GPKeySet staticKeys, byte[] host_challenge, byte[] card_challenge)
{
GPKeySet sessionKeys = new GPKeySet();
byte[] derivationData = new byte[16];
Array.Copy(card_challenge, 4, derivationData, 0, 4);
Array.Copy(host_challenge, 0, derivationData, 4, 4);
Array.Copy(card_challenge, 0, derivationData, 8, 4);
Array.Copy(host_challenge, 4, derivationData, 12, 4);
try
{
//Cipher cipher = Cipher.getInstance("DESede/ECB/NoPadding");
foreach (KeySessionType v in KeyTypeList.Values)
{
if (v == KeySessionType.RMAC) // skip RMAC key
{
continue;
}
//cipher.init(Cipher.ENCRYPT_MODE, staticKeys.getKeyFor(v));
//GPKey nk = new GPKey(cipher.doFinal(derivationData), Type.DES3);
byte[] result = GPCrypto.DoEncrypt_DES3_ECB(staticKeys.GetKeyFor(v).GetEncoded(), derivationData);
GPKey nk = new GPKey(result, KeyType.DES3);
sessionKeys.SetKey(v, nk);
}
// KEK is the same
sessionKeys.SetKey(KeySessionType.KEK, staticKeys.GetKey(KeySessionType.KEK));
return(sessionKeys);
}
//catch (NoSuchAlgorithmException e)
//{
// throw new IllegalStateException("Session keys calculation failed.", e);
//}
//catch (NoSuchPaddingException e)
//{
// throw new IllegalStateException("Session keys calculation failed.", e);
//}
//catch (InvalidKeyException e)
//{
// throw new RuntimeException("Session keys calculation failed.", e);
//}
//catch (IllegalBlockSizeException e)
//{
// throw new RuntimeException("Session keys calculation failed.", e);
//}
//catch (BadPaddingException e)
//{
// throw new RuntimeException("Session keys calculation failed.", e);
//}
catch (Exception e)
{
throw new Exception("Session keys calculation failed.", e);
}
}
private GPKeySet DeriveSessionKeysSCP03(GPKeySet staticKeys, byte[] host_challenge, byte[] card_challenge)
{
GPKeySet sessionKeys = new GPKeySet();
byte mac_constant = 0x06;
byte enc_constant = 0x04;
byte rmac_constant = 0x07;
byte[] context = Arrays.Concatenate(host_challenge, card_challenge);
// MAC
byte[] kdf = SCP03Wrapper.Scp03_kdf(staticKeys.GetKey(KeySessionType.MAC), mac_constant, context, 128);
sessionKeys.SetKey(KeySessionType.MAC, new GPKey(kdf, KeyType.AES));
// ENC
kdf = SCP03Wrapper.Scp03_kdf(staticKeys.GetKey(KeySessionType.ENC), enc_constant, context, 128);
sessionKeys.SetKey(KeySessionType.ENC, new GPKey(kdf, KeyType.AES));
// RMAC
kdf = SCP03Wrapper.Scp03_kdf(staticKeys.GetKey(KeySessionType.MAC), rmac_constant, context, 128);
sessionKeys.SetKey(KeySessionType.RMAC, new GPKey(kdf, KeyType.AES));
// KEK remains the same
sessionKeys.SetKey(KeySessionType.KEK, staticKeys.GetKey(KeySessionType.KEK));
return(sessionKeys);
}
