How to compute the digital signature in this Applet?

[bigWhite]

I'm a beginner of javacard, and study this applet. I want to sign a data, but no matte what I send the APDU command, it always returns 0x6985, this is why?

And I already send verify command before signature .

It throws Exception in here:

Code: Select all

if (!sig_key.getPrivate().isInitialized())
         ISOException.throwIt(SW_CONDITIONS_NOT_SATISFIED);

[ThePhoenyx]

You have done a verify but have you created the RSA keys (public/private) for the 3 functions (being sign/encrypt/authenticate)?
What the error is, it's telling you no key is there.

[UNKNwYSHSA]

Please look the code of the key initialization, the function genKeyPair() shall be called before the key used.

[Ellisun]

You can refer to this topic.

[bigWhite]

You can refer to this topic.

Thanks, it very helpful to me