JavaCard OS

Posted: **Mon Mar 21, 2016 4:04 am**

I have used this code line to initialize RSA cipher.

 crypto.rsaCipher.init(keyStore.cardPrivateKey, Cipher.MODE_DECRYPT);

which is initialized as:

Code: Select all

rsaCipher = Cipher.getInstance(Cipher.ALG_RSA_NOPAD, false);

Now my question is I am not sure which parameter to select between Cipher.MODE_ENCRYPT and Cipher.MODE_DECRYPT to generate digital signature. Any one knows? Pls help! Any comment is appreciated.

Posted: **Tue Mar 22, 2016 2:22 am**

Signature.MODE_SIGN

Posted: **Tue Mar 22, 2016 2:28 am**

Signature.MODE_SIGN

Using Signature.MODE_SIGN is incorrect, just in my opinion.

Posted: **Tue Mar 22, 2016 3:22 am**

Both Cipher.MODE_DECRYPT and Signature.MODE_SIGN work for you.

The reason is simply that Cipher.MODE_DECRYPT and Signature.MODE_SIGN both have the same integer value: 2

JavaCard OS

Which can I choose for digital signature, Cipher.MODE_ENCRYPT or Cipher.MODE_DECRYPT?

Which can I choose for digital signature, Cipher.MODE_ENCRYPT or Cipher.MODE_DECRYPT?

Re: Which can I choose for digital signature, Cipher.MODE_ENCRYPT or Cipher.MODE_DECRYPT?

Re: Which can I choose for digital signature, Cipher.MODE_ENCRYPT or Cipher.MODE_DECRYPT?

Re: Which can I choose for digital signature, Cipher.MODE_ENCRYPT or Cipher.MODE_DECRYPT?