Hi everybody,
I have the following problem: I am using GemXpresso 211 PK/IS to develop a
javacard based solution. One part of this solution is to authenticate the
user to an external host via Challenge/Response. I would like to encrypt the
incoming challenge with my private key (RSA 512 bit) contained in my card.
My Gemplus 211PK/Is card seems to support just one RSA-Cipher algorithm:
ALG_RSA_NOPAD. When I try to use the others I get a NoSuchAlgorithm
Exception.
Ok, so I tried the ALG_RSA_NOPAD together with my private key and what I get
is an Illegal Value Exception which is to be interpreted as an inconsistency
of the key with the Cipher-algorithm. Here is the code:
keyP = new KeyPair(KeyPair.ALG_RSA,(short)512);
keyP.genKeyPair();
rsaCipher = Cipher.getInstance(Cipher.ALG_RSA_NOPAD, false);
Key privateKey = keyP.getPrivate();
if(!privateKey.isInitialized())
ISOException.throwIt(ISO7816.SW_CONDITIONS_NOT_SATISFIED);
rsaCipher.init(privateKey, Cipher.MODE_ENCRYPT);
How can I solve this problem? Where is the bug?
thanks a lot for your help
Marcel
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