JavaCard OS

Code: Select all

package ECCtest;

import javacard.framework.*;
import javacard.security.*;
import javacardx.crypto.*;

public class ECCtest extends Applet
{
private byte[] PLAINTEXT ;
private ECPrivateKey objECDSAPriKey=null;   
private ECPublicKey objECDSAPubKey=null;    
private KeyPair objECDSAKeyPair=null;       
private Signature objECDSASign=null;        

final static short BAS =  0;

public static void install(byte[] bArray, short bOffset, byte bLength)
{
  new ECCtest(bArray, bOffset, bLength);
}

private ECCtest(byte bArray[], short bOffset, byte bLength)
 { 
  PLAINTEXT = new byte[0x100] ; 
  Util.arrayFillNonAtomic(PLAINTEXT,  BAS, (short)0x100, (byte)0);

  objECDSAKeyPair= new KeyPair(KeyPair.ALG_EC_FP, KeyBuilder.LENGTH_EC_FP_192);          

  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 ; 
          objECDSASign.init(objECDSAPriKey, Signature.MODE_SIGN);

          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;
} 

}

Code: Select all

PLAINTEXT = new byte[0x100]; 

Code: Select all

    objECDSAKeyPair= new KeyPair(KeyPair.ALG_EC_FP, KeyBuilder.LENGTH_EC_FP_192);         
    objECDSASign = Signature.getInstance(Signature.ALG_ECDSA_SHA, false);