RMI client-side - how to encrypt,decrypt in client-side

Question

I write javacard RMI style. My problem is...
Source code below is work when it write in applet (card - side)
but in client-side (reader -side) I copy it to client - side code and test to run, if fail --> throw exception 0x3 - javacard.security.CryptoException.NO_SUCH_ALGORITHM
It seem to be "javacardx.crypto" and "javacard.security" is make for use in applet in card only. Did I misunderstand?
if it make for use in applet only, how is possible to do like this " card use privatekey to sign message and send to reader , reader use card's publickey to verify that card sign this signature or not."
or
"card use reader's publickey to encrypt message and send to reader, then reader use privatekey to decrypt message (reader authencate itself) "
because I can't do any of cipher , keybuilder in RMI-client side(reader)
Cipher.getInstance(Cipher.ALG_RSA_PKCS1,false);
it will throw nullPointerException
and if (change false to true)
Cipher.getInstance(Cipher.ALG_RSA_PKCS1,true);
throw exception 0x3 - javacard.security.CryptoException.NO_SUCH_ALGORITHM
after that I swap this line with
pri_key = (RSAPrivateKey) KeyBuilder.buildKey(KeyBuilder.TYPE_RSA_PRIVATE,KeyBuilder.LENGTH_RSA_512, false);
since it will do this first (i swap the line already) it also throw exception 0x3 - javacard.security.CryptoException.NO_SUCH_ALGORITHM
also be the same result with swap
kp = new KeyPair(KeyPair.ALG_RSA,(short)KeyBuilder.LENGTH_RSA_512 );
to a first line
it throw exception 0x3 - javacard.security.CryptoException.NO_SUCH_ALGORITHM
Please help me
RSAPrivateKey pri_key;
RSAPublicKey pub_key;
KeyPair kp;
Cipher RSAcipher;
RSAcipher = Cipher.getInstance(Cipher.ALG_RSA_PKCS1,false);
pri_key = (RSAPrivateKey) KeyBuilder.buildKey(KeyBuilder.TYPE_RSA_PRIVATE,KeyBuilder.LENGTH_RSA_512, false);
pub_key =(RSAPublicKey) KeyBuilder.buildKey(KeyBuilder.TYPE_RSA_PUBLIC,KeyBuilder.LENGTH_RSA_512, false);
kp = new KeyPair(KeyPair.ALG_RSA,(short)KeyBuilder.LENGTH_RSA_512 );
kp.genKeyPair();
          pri_key = (RSAPrivateKey) kp.getPrivate();
          pub_key = (RSAPublicKey) kp.getPublic();
//ENCRYPT
RSAcipher.init(pri_key, Cipher.MODE_ENCRYPT);
t_cipherLengthRSA = RSAcipher.doFinal(plaintxt,(short)0, (short)plaintxt.length, t_cipherText, (short)0);
//DECRYPT
RSAcipher.init(pub_key, Cipher.MODE_DECRYPT);
RSAcipher.doFinal(ciphertxt,(short)0,(short) t_cipherLengthRSA, temp1, (short)0);

Answer 1

I write javacard RMI style. My problem is...
Source code below is work when it write in applet (card - side)
but in client-side (reader -side) I copy it to client - side code and test to run, if fail --> throw
exception 0x3 - javacard.security.CryptoException.NO_SUCH_ALGORITHMYou can not share code between card and client. On the card use the classes of javacardx.crypto and on the client side those of javax.crypto and java.security.
It seem to be "javacardx.crypto" and "javacard.security" is make for use in applet in card only. That is right.
if it make for use in applet only, how is possible to
do like this " card use privatekey to sign message
and send to reader , reader use card's publickey to
verify that card sign this signature or not." or
"card use reader's publickey to encrypt message and
send to reader, then reader use privatekey to decrypt
message (reader authencate itself) "On each platform you have classes that provide the same cryptographic operations but the interface of these classes is different (because of the limitations of the java card platform).
because I can't do any of cipher , keybuilder in
RMI-client side(reader)Use the java.security.KeyFactory instead.
Cipher.getInstance(Cipher.ALG_RSA_PKCS1,false);
it will throw nullPointerException
and if (change false to true)
Cipher.getInstance(Cipher.ALG_RSA_PKCS1,true);
throw exception 0x3 -
javacard.security.CryptoException.NO_SUCH_ALGORITHMCryptographic support on java cards is optional. Not every card supports every algorithm. Try to use another algo.
Jan