ECDSA Issue
Posted: Tue Nov 08, 2016 1:24 am
I am using ECDSA to do signature. However, it always threw 6F00 during Install. I tried to debug and found the problem caused by the code below. I wonder how I can modify to avoid the problem? Please help me regarding this issue.
My code:
Code: Select all
objECDSAKeyPair= new KeyPair(KeyPair.ALG_EC_FP, KeyBuilder.LENGTH_EC_FP_192);My code:
Code: Select all
package Test;
import javacard.framework.*;
import javacard.security.*;
import javacardx.crypto.*;
public class Test extends Applet{
private byte[] PLAINTEXT ;
private ECPrivateKey objECDSAPriKey=null; // Object for ECDSA Private Key
private ECPublicKey objECDSAPubKey=null; // Object for ECDSA Public Key
private KeyPair objECDSAKeyPair=null; // Object for ECDSA Key Pair
private Signature objECDSASign=null; // Object for ECDSA Signature
final static short BAS = 0;
public static void install(byte[] bArray, short bOffset, byte bLength){
new Test(bArray, bOffset, bLength);
}
private Test(byte bArray[], short bOffset, byte bLength){
PLAINTEXT = new byte[0x100] ; // Data file
Util.arrayFillNonAtomic(PLAINTEXT, BAS, (short)0x100, (byte)0);
objECDSAKeyPair= new KeyPair(KeyPair.ALG_EC_FP, KeyBuilder.LENGTH_EC_FP_192);
// Create Signature Object
objECDSASign = Signature.getInstance(Signature.ALG_ECDSA_SHA, false);
register();
}
public void process(APDU apdu){
byte buf[] = apdu.getBuffer();
switch(buf[1])
{
case (byte)0xA4: break;
case (byte)0x46:
objECDSAKeyPair.genKeyPair();
objECDSAPriKey = (ECPrivateKey)objECDSAKeyPair.getPrivate();
objECDSAPubKey = (ECPublicKey)objECDSAKeyPair.getPublic();
break;
case (byte)0x2E:
short Le = apdu.setOutgoing();
short sSignLen=0 ;
// Init with Private Key
objECDSASign.init(objECDSAPriKey, Signature.MODE_SIGN);
//objECDSASign.init(objECDSAKeyPair.getPrivate(), Signature.MODE_SIGN);
// Sign Data
sSignLen = objECDSASign.sign(PLAINTEXT, BAS, Le, buf, BAS);
apdu.setOutgoingLength(sSignLen);
apdu.sendBytes(BAS, sSignLen);
break;
default:
ISOException.throwIt(ISO7816.SW_INS_NOT_SUPPORTED);
}
return;
} }
