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 DeriveSessionKeysSCP02(GPKeySet staticKeys, byte[] sequence, bool implicitChannel)
{
GPKeySet sessionKeys = new GPKeySet();
try
{
//Cipher cipher = Cipher.getInstance("DESede/CBC/NoPadding");
byte[] derivationData = new byte[16];
Array.Copy(sequence, 0, derivationData, 2, 2);
byte[] constantMAC = new byte[] { (byte)0x01, (byte)0x01 };
Array.Copy(constantMAC, 0, derivationData, 0, 2);
//cipher.init(Cipher.ENCRYPT_MODE, staticKeys.getKeyFor(KeySessionType.MAC), GPCrypto.iv_null_des);
//GPKey nk = new GPKey(cipher.doFinal(derivationData), Type.DES3);
byte[] result = GPCrypto.DoEncrypt_DES3_CBC(staticKeys.GetKeyFor(KeySessionType.MAC).GetEncoded(), derivationData);
GPKey nk = new GPKey(result, KeyType.DES3);
sessionKeys.SetKey(KeySessionType.MAC, nk);
// TODO: is this correct? - increment by one for all other than C-MAC
if (implicitChannel)
{
Buffer_increment(derivationData, 2, 2);
}
byte[] constantRMAC = new byte[] { (byte)0x01, (byte)0x02 };
Array.Copy(constantRMAC, 0, derivationData, 0, 2);
//cipher.init(Cipher.ENCRYPT_MODE, staticKeys.getKeyFor(KeySessionType.MAC), GPCrypto.iv_null_des);
//nk = new GPKey(cipher.doFinal(derivationData), Type.DES3);
byte[] result2 = GPCrypto.DoEncrypt_DES3_CBC(staticKeys.GetKeyFor(KeySessionType.MAC).GetEncoded(), derivationData);
nk = new GPKey(result2, KeyType.DES3);
sessionKeys.SetKey(KeySessionType.RMAC, nk);
byte[] constantENC = new byte[] { (byte)0x01, (byte)0x82 };
Array.Copy(constantENC, 0, derivationData, 0, 2);
//cipher.init(Cipher.ENCRYPT_MODE, staticKeys.getKeyFor(KeySessionType.ENC), GPCrypto.iv_null_des);
//nk = new GPKey(cipher.doFinal(derivationData), Type.DES3);
byte[] result3 = GPCrypto.DoEncrypt_DES3_CBC(staticKeys.GetKeyFor(KeySessionType.ENC).GetEncoded(), derivationData);
nk = new GPKey(result3, KeyType.DES3);
sessionKeys.SetKey(KeySessionType.ENC, nk);
byte[] constantDEK = new byte[] { (byte)0x01, (byte)0x81 };
Array.Copy(constantDEK, 0, derivationData, 0, 2);
//cipher.init(Cipher.ENCRYPT_MODE, staticKeys.getKeyFor(KeySessionType.KEK), GPCrypto.iv_null_des);
//nk = new GPKey(cipher.doFinal(derivationData), Type.DES3);
byte[] result4 = GPCrypto.DoEncrypt_DES3_CBC(staticKeys.GetKeyFor(KeySessionType.KEK).GetEncoded(), derivationData);
nk = new GPKey(result4, KeyType.DES3);
sessionKeys.SetKey(KeySessionType.KEK, nk);
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 (InvalidAlgorithmParameterException e)
//{
// throw new RuntimeException("Session keys calculation failed.", e);
//}
catch (Exception e)
{
throw new Exception("Session keys calculation failed.", e);
}
}
