public static Apdu GetClearApdu(Apdu smApdu, BSO encKey, BSO sigKey, BSO outEncKey, BSO outSigKey, byte[] challenge)
{
if (sigKey == null && encKey == null)
{
Apdu apdu2 = new Apdu();
apdu2.CLA = 0;
apdu2.INS = smApdu.INS;
apdu2.P1 = smApdu.P1;
apdu2.P2 = smApdu.P2;
apdu2.Data = smApdu.Data;
apdu2.LE = smApdu.LE;
apdu2.UseLE = smApdu.UseLE;
return(apdu2);
}
TLV tlv = new TLV(smApdu.Data);
ByteArray ClearData = null;
var NetLEObject = tlv[0x96];
var CypherTextObject = tlv[0x87];
var PlainTextObject = tlv[0x81];
var MACObject = tlv[0x8E];
if (CypherTextObject != null && PlainTextObject != null)
{
throw new ISO7816Exception(Error.DataFieldNotValid);
}
if ((encKey != null && CypherTextObject == null) ||
(encKey == null && CypherTextObject != null))
{
throw new ISO7816Exception(Error.ConditionsOfUseNotSatisfied);
}
if ((sigKey != null && MACObject == null) ||
(sigKey == null && MACObject != null))
{
throw new ISO7816Exception(Error.ConditionsOfUseNotSatisfied);
}
if (PlainTextObject != null)
{
ClearData = PlainTextObject;
}
if (encKey != null && CypherTextObject != null)
{
ClearData = ByteArray.RemoveISOPad(CardHandler.decrypt3DES(encKey.Data, new ByteArray(CypherTextObject).Sub(1)));
}
if (sigKey != null && MACObject != null)
{
if (challenge == null)
{
throw new ISO7816Exception(Error.ConditionsOfUseNotSatisfied);
}
var HeaderBlock = new ByteArray(challenge);
HeaderBlock = HeaderBlock.Append(new ByteArray(smApdu.GetBytes()).Left(4));
HeaderBlock = ByteArray.ANSIPad(HeaderBlock);
byte[] toMAC = null;
if (CypherTextObject != null && CypherTextObject.Length != 0)
{
TLV ptb = new TLV();
ptb[0x87] = CypherTextObject;
toMAC = ptb.GetBytes();
}
else
{
if (ClearData != null && ClearData.Size != 0)
{
TLV ptb = new TLV();
ptb[0x81] = ClearData;
toMAC = ptb.GetBytes();
}
else
{
if (PlainTextObject != null)
{
throw new ISO7816Exception(Error.SMDataObjectsIncorrect);
}
toMAC = new byte[0];
}
}
HeaderBlock = HeaderBlock.Append(ByteArray.ANSIPad(toMAC));
var mac = CardHandler.getMAC(sigKey.Data, HeaderBlock);
if (!new ByteArray(mac).CompareByteArray(MACObject))
{
throw new ISO7816Exception(Error.VerificationFailed);
}
}
Apdu ClearApdu = new Apdu((byte)(smApdu.CLA & 0xf0), smApdu.INS, smApdu.P1, smApdu.P2, ClearData);
if (NetLEObject != null)
{
ClearApdu.UseLE = true;
ClearApdu.LE = NetLEObject[0];
}
else
{
ClearApdu.UseLE = smApdu.UseLE;
if (ClearApdu.UseLE)
{
int orLE = smApdu.LE;
if (orLE == 0)
{
orLE = 255;
}
if (outEncKey == null && outSigKey == null)
{
ClearApdu.LE = (byte)(orLE - 2);
}
else if (outEncKey != null && outSigKey == null)
{
ClearApdu.LE = (byte)((orLE - 3) & ~7);
}
else if (outEncKey == null && outSigKey != null)
{
ClearApdu.LE = (byte)(orLE - 12);
}
else if (outEncKey != null && outSigKey != null)
{
ClearApdu.LE = (byte)((orLE - 20) & ~7);
}
}
}
return(ClearApdu);
}