Hi,
I need help on the single des encryption. I am
currently using the below configuration.
- GemXpresso
- GSE Simulation
- JDK 1.2.2
I have created a single DES function. However, I am
unable to get the right encryption out from it. Below
are the data:
- key : 0 0 0 0 0 0 0 0
- data : 0 0 0 0 0 0 0 0
- encryted data return by the GSE
57 87 D1 5F 28 6C 3A 3B (wrong)
- expected data needed
8C A6 4D E9 C1 B1 23 A7
The function is added into the OPPurse example
supplied by Gemplus. Was there something that I have
missed out?
Below is part of function I have added :
// this will set the DES3 key , supply the des3
key using APDU command
private void setDesKey( APDU apdu ){
byte[] apduBuffer = apdu.getBuffer() ;
if( apduBuffer[4] !=(short) 8 ||
apdu.setIncomingAndReceive()!=(short)8 ){
ISOException.throwIt(ISO7816.SW_WRONG_LENGTH);
}
Util.arrayCopyNonAtomic(apduBuffer,(short)5,desKeyBuffer,(short)0,(short)8);
}
//this will encrypt the apdu data using the des3
key
private void encrypt(APDU apdu ){
byte[] apduBuffer = apdu.getBuffer() ;
short len = apdu.setIncomingAndReceive();
DESKey singleDESKey = returnDESKey();
byte [] result =
encryptData(apduBuffer,len,apdu,singleDESKey);
returnByteArray(apdu,result);
}
private byte[] encryptData(byte[] datain ,short
length,APDU apdu,DESKey key){
byte [] result = JCSystem.makeTransientByteArray
(length,JCSystem.CLEAR_ON_DESELECT);
Cipher c =
Cipher.getInstance(Cipher.ALG_DES_CBC_NOPAD ,true);
c.init(key , Cipher.MODE_ENCRYPT);
c.dofinal(datain,(short)5,length,result,(short)0);
return result;
}
private DESKey returnDESKey(){
DESKey deskey ;
deskey =(DESKey)KeyBuilder.buildKey
(KeyBuilder.TYPE_DES_TRANSIENT_RESET
,KeyBuilder.LENGTH_DES ,false);
deskey.setKey(desKeyBuffer ,(short)0);
return deskey;
}
private void returnByteArray(APDU apdu, byte[]
outData){
Util.arrayCopyNonAtomic(outData,(short)0,apdu.getBuffer(),
(short)5,(short)outData.length);
apdu.setOutgoing() ; // Switches to output mode
apdu.setOutgoingLength((short)outData.length ) ;
// bytes to return
apdu.sendBytes( (short)5, (short)outData.length
);//
}
With Regards,
Kelvin Lim
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