RFR: 8271745: Correct block size for KW, KWP mode and use fixed IV for KWP mode for SunJCE

[Sean Mullan]

On Tue, 31 Aug 2021 00:09:10 GMT, Valerie Peng <valeriep at openjdk.org> wrote:

>> src/java.base/share/classes/com/sun/crypto/provider/KeyWrapCipher.java line 237:
>> 
>>> 235:     @Override
>>> 236:     protected int engineGetBlockSize() {
>>> 237:         return 8;
>> 
>> Line 186 still says: 
>> 
>> `* symmetric cipher whose block size must be 128-bit`
>> 
>> Should that also be updated?
>
> Line 186 is correct in that the underlying Cipher block size must be 128-bit. However, the KW/KWP processing affected the input size requirement into 8-byte blocks, thus the overall cipher block size is now 8 instead of 16 bytes.

So the block size is always 8 even when there is no padding?

-------------

PR: https://git.openjdk.java.net/jdk/pull/5236