• KeyFactory#getKeySpec(Key,Class)
 
Specification states that
InvalidKeySpecException if the requested key specification is
inappropriate for the given key, or the given key cannot be processed
(e.g., the given key has an unrecognized algorithm or format).

My understanding is that if I provide an invalid key to this method, I expect InvalidKeyException
but for “RSASSA-PSS” algorithm, the KeyFactory throws “NullPointerException”
 
Code:
class InvalidKey implements Key{
    @Override
    public String getAlgorithm() {
        return null;
    }
    @Override
    public String getFormat() {
        return null;
    }
    @Override
    public byte[] getEncoded() {
        return null;
    }
}
KeyFactory keyFactory = KeyFactory.getInstance(“RSASSA-PSS”);
              keyFactory.getKeySpec(new InvalidKey(),X509EncodedKeySpec.class); //throws NPE instead of InvalidKeyException
=========
Output:
Exception java.lang.NullPointerException
      at RSAKeyFactory.checkKeyAlgo (RSAKeyFactory.java:103)
      at RSAKeyFactory.engineTranslateKey (RSAKeyFactory.java:212)
      at RSAKeyFactory.engineGetKeySpec (RSAKeyFactory.java:399)
 
 
• KeyFactory#translateKey(Key):
 
Specification states that InvalidKeyException if the given key cannot be processed by this key factory.

My understanding is that if I provide an invalid key to this method, I expect InvalidKeyException but for
“RSASSA-PSS” algorithm, the KeyFactory throws “NullPointerException”
 
Code:
  class InvalidKey implements Key{
    @Override
    public String getAlgorithm() {
        return null;
    }
    @Override
    public String getFormat() {
        return null;
    }
    @Override
    public byte[] getEncoded() {
        return null;
    }
}
 
                     KeyFactory keyFactory = KeyFactory.getInstance(“RSASSA-PSS”);
                     keyFactory.translateKey(new InvalidKey()); // Throw NPE instead of InvalidKeyException.
 =======
Output:
Exception java.lang.NullPointerException
       at RSAKeyFactory.checkKeyAlgo (RSAKeyFactory.java:103)
       at RSAKeyFactory.engineTranslateKey (RSAKeyFactory.java:212)
       at KeyFactory.translateKey (KeyFactory.java:470)
===================================================
I have checked with other algorithm, it throws "InvalidKeyException"

For e.g.
jshell> KeyFactory keyFactory = KeyFactory.getInstance("XDH");
keyFactory ==> java.security.KeyFactory@77167fb7

jshell> keyFactory.getKeySpec(new InvalidKey(),X509EncodedKeySpec.class)

| Exception java.security.spec.InvalidKeySpecException: Unsupported key type
| at XDHKeyFactory.engineGetKeySpec (XDHKeyFactory.java:226)
| at KeyFactory.getKeySpec (KeyFactory.java:439)
| at (#46:1)

jshell> keyFactory.translateKey(new InvalidKey())
| Exception java.security.InvalidKeyException: Unsupported key type or format
| at XDHKeyFactory.engineTranslateKey (XDHKeyFactory.java:94)
| at KeyFactory.translateKey (KeyFactory.java:470)
| at (#47:1)