验证在 JavaCard 上签名的数据时出现 Java BadPaddingException

Question

I'm signing some data on a JavaCard with a cipher, then outputting it into a text file, reading it into a java program and trying to verify it. I keep getting a BadPaddingException.

I'm signing it like so on my JavaCard applet:

Cipher cipher = Cipher.getInstance(Cipher.ALG_RSA_PKCS1, false);
cipher.init(key.getPrivate(), Cipher.MODE_ENCRYPT);
short sigCipherLength = cipher.doFinal(inputArray, inputOffset, inputLength, outputArray, outputOffset);

And verifying it like this (on my Java program):

Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
cipher.init(Cipher.DECRYPT_MODE, publicKey);
byte[] decryptedText = cipher.doFinal(inputArray);

When using Cipher.getInstance with "RSA" it defautls to RSA/ECB/RKPCS1Padding does it not? I'm stuck on how to get rid of the error.

Edit: to change encryption and decyrption to sign and verify, for clarity

Answer 1

Maybe this will help: Which padding is used by javax.crypto.Cipher for RSA . In short, do not rely on the default, it is best to fully qualify the cipher.