RFR: ChaCha20 and ChaCha20/Poly1305 Cipher implementations

[Jamil Nimeh]

I think I could pull in Convert.hexStringToByteArray.  I might try 
pulling in that test class locally just to make sure things still run 
before you commit the field arithmetic stuff.  I also noticed I left in 
some debug routines in ChaCha20Cipher that need to get the axe, so I'll 
cut those out today.

--Jamil

On 3/28/2018 6:59 AM, Adam Petcher wrote:
> On 3/28/2018 2:48 AM, sha.jiang at oracle.com wrote:
>
>> Would you like to move this method to a test lib class, like 
>> test/lib/jdk/test/lib/Utils.java? In fact, this class has a method, 
>> named toHexString, for converting bin to hex.
>
> This method appears to be the same as Convert.hexStringToByteArray 
> that I added to jdk.test.lib along with the field arithmetic 
> implementation. That code is not incorporated yet, but the Poly1305 
> code depends on the field arithmetic code, anyway. So adding this 
> dependency may be reasonable.